本文主要讲ssm框架整合EhCache。或许有人会问什么是ehcache。
关于EhCache的介绍和优劣,我想下面的解答足以让读者明白:
EhCache 是一个纯Java的进程内缓存框架,具有快速、精干等特点,是Hibernate中默认的CacheProvider。Ehcache是一种广泛使用的开 源Java分布式缓存。主要面向通用缓存,Java EE和轻量级容器。它具有内存和磁盘存储,缓存加载器,缓存扩展,缓存异常处理程序,一个gzip缓存servlet过滤器,支持REST和SOAP api等特点。
优点:
1. 快速
2. 简单
3. 多种缓存策略
4. 缓存数据有两级:内存和磁盘,因此无需担心容量问题
5. 缓存数据会在虚拟机重启的过程中写入磁盘
6. 可以通过RMI、可插入API等方式进行分布式缓存
7. 具有缓存和缓存管理器的侦听接口
8. 支持多缓存管理器实例,以及一个实例的多个缓存区域
9. 提供Hibernate的缓存实现
缺点:
1. 使用磁盘Cache的时候非常占用磁盘空间:这是因为DiskCache的算法简单,该算法简单也导致Cache的效率非常高。它只是对元素直接追加存储。因此搜索元素的时候非常的快。如果使用DiskCache的,在很频繁的应用中,很快磁盘会满。
2. 不能保证数据的安全:当突然kill掉java的时候,可能会产生冲突,EhCache的解决方法是如果文件冲突了,则重建cache。这对于Cache 数据需要保存的时候可能不利。当然,Cache只是简单的加速,而不能保证数据的安全。如果想保证数据的存储安全,可以使用Bekeley DB Java Edition版本。这是个嵌入式数据库。可以确保存储安全和空间的利用率。
或许还有人很疑惑缓存,什么是缓存?为什么需要缓存?
引用百度百科的回答:
缓存就是数据交换的缓冲区(称作Cache),当某一硬件要读取数据时,会首先从缓存中查找需要的数据,如果找到了则直接执行,找不到的话则从内存中找。由于缓存的运行速度比内存快得多,故缓存的作用就是帮助硬件更快地运行。
因为缓存往往使用的是RAM(断电即掉的非永久储存),所以在用完后还是会把文件送到硬盘等存储器里永久存储。电脑里最大的缓存就是内存条了,最快的是CPU上镶的L1和L2缓存,显卡的显存是给显卡运算芯片用的缓存,硬盘上也有16M或者32M的缓存。
或许还有人会问内存是什么?
引用百度百科的回答:
内存是计算机中重要的部件之一,它是与CPU进行沟通的桥梁。计算机中所有程序的运行都是在内存中进行的,因此内存的性能对计算机的影响非常大。内存(Memory)也被称为内存储器,其作用是用于暂时存放CPU中的运算数据,以及与硬盘等外部存储器交换的数据。只要计算机在运行中,CPU就会把需要运算的数据调到内存中进行运算,当运算完成后CPU再将结果传送出来,内存的运行也决定了计算机的稳定运行。 内存是由内存芯片、电路板、金手指等部分组成的。
也许还人会骂我,说你怎么尽引用百度百科。
我的回答是,因为我对此也不知道怎么回答。
如果让我回答在开发中为什么需要缓存及其缓存的作用,我的回答是,对于有些数据,我只需查询一遍就可以,不需要再度查询,因为有缓存。就好比数据库优化,除了索引之外,还有就是将数据库里面的数据缓存起来,这样对于大规模数据,平常需要多次查询,导致耗费时间很长,性能差,但是我通过缓存,只需查询一次,当再次查询时,就非常快,对整个系统的响应和性能也不会有什么影响。当然了,当涉及到缓存的数据与实际数据库中的数据存在差异时,这里后续会讲采取怎样的方式解决这个问题。
另外建议软件开发的朋友们,有空多多去熟悉熟悉计算机相关的理论知识。正所谓有句话叫做:万变不离其宗。这个其宗在计算机中可以理解为算法与数据结构、操作系统、TCP/IP、计算机基础知识、编译原理等等。把握好这些,编程之路才能越走越长。
这也是一位朋友对我说的。
下面进入正题,关于SSM框架整合EhCache
sql脚本准备
CREATE TABLE `user` ( `user_id` int(8) NOT NULL AUTO_INCREMENT COMMENT ‘用户主键‘, `login_code` varchar(20) NOT NULL COMMENT ‘用户编码(登录账户) 手机号 邮箱号‘, `user_name` varchar(20) NOT NULL COMMENT ‘用户名‘, `password` varchar(40) NOT NULL COMMENT ‘密码‘, `sex` int(2) NOT NULL COMMENT ‘性别‘, `identity_card` varchar(20) DEFAULT NULL COMMENT ‘身份证‘, `create_time` datetime NOT NULL COMMENT ‘创建时间‘, `create_by` varchar(10) NOT NULL COMMENT ‘创建人‘, `update_time` datetime NOT NULL COMMENT ‘更新时间‘, `update_by` varchar(10) NOT NULL COMMENT ‘更新人‘, `status` int(2) NOT NULL DEFAULT ‘0‘ COMMENT ‘状态:0注册新用户 1邮件认证用户 2管理员 3黑名单‘, PRIMARY KEY (`user_id`) ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
一、导入Maven依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.blog</groupId> <artifactId>Blog</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <properties> <!-- 文件拷贝时的编码 --> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <!-- 编译时的编码 --> <maven.compiler.encoding>UTF-8</maven.compiler.encoding> <spring.version>4.3.13.RELEASE</spring.version> <junit.version>4.12</junit.version> <druid.version>1.1.0</druid.version> <fastjson.version>1.2.8</fastjson.version> <mybaitsplus.version>2.1.8</mybaitsplus.version> <mysql.version>5.1.38</mysql.version> <log4j.version>1.2.17</log4j.version> <slf4j.version>1.7.19</slf4j.version> <aspectjweaver.version>1.8.8</aspectjweaver.version> <fileupload.version>1.3.1</fileupload.version> <jstl.version>1.2</jstl.version> <commons-io.version>2.5</commons-io.version> <commons-fileupload.version>1.3.1</commons-fileupload.version> <ruedigermoeller-fst.version>2.56</ruedigermoeller-fst.version> <json.version>20170516</json.version> <dozer.version>5.5.1</dozer.version> <poi.version>3.14</poi.version> </properties> <dependencies> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.1.46</version> </dependency> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.0</version> </dependency> <!-- kisso end --> <!-- JUnit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <dependency> <!-- jsp --> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.1</version> <scope>compile</scope> </dependency> <!-- servlet --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>compile</scope> </dependency> <!-- Spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <!-- Spring MVC --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <!-- AOP --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>${aspectjweaver.version}</version> </dependency> <!-- FileUpload --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>${fileupload.version}</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>${jstl.version}</version> </dependency> <!-- Mybatis-Plus --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus</artifactId> <version>${mybaitsplus.version}</version> </dependency> <!-- Mysql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <!-- Druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>${druid.version}</version> </dependency> <!-- FastJson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>${fastjson.version}</version> </dependency> <!-- Log --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.3.2</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>${commons-io.version}</version> </dependency> <dependency> <groupId>de.ruedigermoeller</groupId> <artifactId>fst</artifactId> <version>${ruedigermoeller-fst.version}</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.10</version> </dependency> <dependency> <groupId>commons-beanutils</groupId> <artifactId>commons-beanutils</artifactId> <version>1.9.3</version> </dependency> <!-- Json in java --> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20170516</version> </dependency> <!-- Email --> <dependency> <groupId>com.sun.mail</groupId> <artifactId>javax.mail</artifactId> <version>1.5.2</version> <scope>provided</scope> </dependency> <!-- <dependency> <groupId>javax.activation</groupId> <artifactId>activation</artifactId> <version>1.1.1</version> </dependency> --> <!-- 条形码、二维码生成 --> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.0</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.3.0</version> </dependency> <!-- User Agent --> <dependency> <groupId>eu.bitwalker</groupId> <artifactId>UserAgentUtils</artifactId> <version>1.20</version> </dependency> <!-- Apache HTTP --> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.3</version> </dependency> <!-- Jsoup HTTP --> <dependency> <groupId>org.jsoup</groupId> <artifactId>jsoup</artifactId> <version>1.9.1</version> </dependency> <!-- 图片Meta获取 --> <dependency> <groupId>com.drewnoakes</groupId> <artifactId>metadata-extractor</artifactId> <version>2.9.1</version> </dependency> <!-- 缩略图工具 --> <dependency> <groupId>net.coobird</groupId> <artifactId>thumbnailator</artifactId> <version>0.4.8</version> </dependency> <!-- 图片验证码生成 --> <dependency> <groupId>com.bladejava</groupId> <artifactId>blade-patchca</artifactId> <version>1.0.5</version> </dependency> <!-- jackson --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.9.4</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.5</version> </dependency> <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.dataformat/jackson-dataformat-xml --> <dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-xml</artifactId> <version>2.9.5</version> </dependency> <!-- Java xml --> <dependency> <groupId>dom4j</groupId> <artifactId>dom4j</artifactId> <version>1.6.1</version> </dependency> <!-- XPath xml --> <dependency> <groupId>jaxen</groupId> <artifactId>jaxen</artifactId> <version>1.1.6</version> </dependency> <!-- Snake YAML --> <dependency> <groupId>org.yaml</groupId> <artifactId>snakeyaml</artifactId> <version>1.17</version> </dependency> <!-- Bean To Bean copy --> <dependency> <groupId>net.sf.dozer</groupId> <artifactId>dozer</artifactId> <version>${dozer.version}</version> </dependency> <!-- POI Office Tools --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>${poi.version}</version> <exclusions> <exclusion> <artifactId>commons-codec</artifactId> <groupId>commons-codec</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>${poi.version}</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml-schemas</artifactId> <version>${poi.version}</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-scratchpad</artifactId> <version>${poi.version}</version> </dependency> <!-- pinyin4j --> <dependency> <groupId>com.belerweb</groupId> <artifactId>pinyin4j</artifactId> <version>2.5.0</version> </dependency> <!-- Apache Tools Ant Tar Zip --> <dependency> <groupId>org.apache.ant</groupId> <artifactId>ant</artifactId> <version>1.9.7</version> </dependency> <!-- File MimeType ContentType --> <dependency> <groupId>net.sf.jmimemagic</groupId> <artifactId>jmimemagic</artifactId> <version>0.1.3</version> <exclusions> <exclusion> <groupId>xerces</groupId> <artifactId>xercesImpl</artifactId> </exclusion> <exclusion> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-xc</artifactId> </exclusion> <exclusion> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-jaxrs</artifactId> </exclusion> <exclusion> <artifactId>log4j</artifactId> <groupId>log4j</groupId> </exclusion> </exclusions> </dependency> <!-- swagger --> <dependency> <groupId>com.mangofactory</groupId> <artifactId>swagger-springmvc</artifactId> <version>1.0.2</version> </dependency> <!-- hutool --> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>4.1.0</version> </dependency> <dependency> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache</artifactId> <version>2.10.4</version> </dependency> </dependencies> <build> <plugins> <!-- 指定编译版本 --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> <finalName>${project.artifactId}</finalName> </build> <repositories> <repository> <id>aliyun-repos</id> <name>Aliyun Repository</name> <url>http://maven.aliyun.com/nexus/content/groups/public</url> <releases><enabled>true</enabled></releases> <snapshots><enabled>false</enabled></snapshots> </repository> </repositories> <pluginRepositories> <pluginRepository> <id>aliyun-repos</id> <name>Aliyun Repository</name> <url>http://maven.aliyun.com/nexus/content/groups/public</url> <releases><enabled>true</enabled></releases> <snapshots><enabled>false</enabled></snapshots> </pluginRepository> </pluginRepositories> </project>
二、编写实体
package com.blog.entity; import java.io.Serializable; import com.baomidou.mybatisplus.enums.IdType; import java.util.Date; import com.baomidou.mybatisplus.annotations.TableId; import com.baomidou.mybatisplus.annotations.TableName; import com.baomidou.mybatisplus.annotations.TableField; import com.baomidou.mybatisplus.activerecord.Model; import java.io.Serializable; /** * <p> * * </p> * * @author youcong123 * @since 2018-07-22 */ @TableName("user") public class User extends Model<User> { private static final long serialVersionUID = 1L; /** * 用户主键 */ @TableId(value = "user_id", type = IdType.AUTO) private Integer userId; /** * 用户编码(登录账户) 手机号 邮箱号 */ @TableField("login_code") private String loginCode; /** * 用户名 */ @TableField("user_name") private String userName; /** * 密码 */ private String password; /** * 性别 */ private Integer sex; /** * 身份证 */ @TableField("identity_card") private String identityCard; /** * 创建时间 */ @TableField("create_time") private Date createTime; /** * 创建人 */ @TableField("create_by") private String createBy; /** * 更新时间 */ @TableField("update_time") private Date updateTime; /** * 更新人 */ @TableField("update_by") private String updateBy; /** * 状态:0注册新用户 1邮件认证用户 2管理员 3黑名单 */ private Integer status; public Integer getUserId() { return userId; } public void setUserId(Integer userId) { this.userId = userId; } public String getLoginCode() { return loginCode; } public void setLoginCode(String loginCode) { this.loginCode = loginCode; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public Integer getSex() { return sex; } public void setSex(Integer sex) { this.sex = sex; } public String getIdentityCard() { return identityCard; } public void setIdentityCard(String identityCard) { this.identityCard = identityCard; } public Date getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } public String getCreateBy() { return createBy; } public void setCreateBy(String createBy) { this.createBy = createBy; } public Date getUpdateTime() { return updateTime; } public void setUpdateTime(Date updateTime) { this.updateTime = updateTime; } public String getUpdateBy() { return updateBy; } public void setUpdateBy(String updateBy) { this.updateBy = updateBy; } public Integer getStatus() { return status; } public void setStatus(Integer status) { this.status = status; } @Override protected Serializable pkVal() { return this.userId; } @Override public String toString() { return "User{" + "userId=" + userId + ", loginCode=" + loginCode + ", userName=" + userName + ", password=" + password + ", sex=" + sex + ", identityCard=" + identityCard + ", createTime=" + createTime + ", createBy=" + createBy + ", updateTime=" + updateTime + ", updateBy=" + updateBy + ", status=" + status + "}"; } }
三、编写DAO
package com.blog.mapper; import com.blog.entity.User; import com.baomidou.mybatisplus.mapper.BaseMapper; /** * <p> * Mapper 接口 * </p> * * @author youcong123 * @since 2018-07-22 */ public interface UserDao extends BaseMapper<User> { }
四、编写业务接口类
package com.blog.service; import com.blog.entity.User; import com.baomidou.mybatisplus.service.IService; /** * <p> * 服务类 * </p> * * @author youcong123 * @since 2018-07-22 */ public interface UserService extends IService<User> { User getUserById(String userId); User login(String loginCode); }
五、编写业务接口实现类
package com.blog.service.impl; import com.blog.entity.User; import com.blog.mapper.UserDao; import com.blog.service.UserService; import cn.hutool.core.util.StrUtil; import cn.hutool.json.JSONObject; import com.baomidou.mybatisplus.mapper.EntityWrapper; import com.baomidou.mybatisplus.service.impl.ServiceImpl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.cache.annotation.Cacheable; import org.springframework.stereotype.Service; /** * <p> * 服务实现类 * </p> * * @author youcong123 * @since 2018-07-22 */ @Service public class UserServiceImpl extends ServiceImpl<UserDao, User> implements UserService { @Autowired private UserDao userDao; @Override @Cacheable(value="cacheTest") public User getUserById(String userId) { return userDao.selectById(userId); } @Override public User login(String loginCode) { User user = new User(); user.setLoginCode(loginCode); return userDao.selectOne(user); } } 六、编写Controller package com.blog.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import com.blog.entity.User; import com.blog.service.UserService; import cn.hutool.json.JSONObject; /** * <p> * 前端控制器 * </p> * * @author youcong123 * @since 2018-07-22 */ @RestController @RequestMapping("/user") public class UserController { @Autowired private UserService userService; @GetMapping(value="getById",produces="application/json;charset=utf-8") public Object getById(String userId) { JSONObject json = new JSONObject(); User user = userService.getUserById(userId); json.put("user", user); return user; } }
七、编写DAO对应的XML
UserDao.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.blog.mapper.UserDao"> <!-- 通用查询映射结果 --> <resultMap id="BaseResultMap" type="com.blog.entity.User"> <id column="user_id" property="userId" /> <result column="login_code" property="loginCode" /> <result column="user_name" property="userName" /> <result column="password" property="password" /> <result column="sex" property="sex" /> <result column="identity_card" property="identityCard" /> <result column="create_time" property="createTime" /> <result column="create_by" property="createBy" /> <result column="update_time" property="updateTime" /> <result column="update_by" property="updateBy" /> <result column="status" property="status" /> </resultMap> <!-- 通用查询结果列 --> <sql id="Base_Column_List"> user_id AS userId, login_code AS loginCode, user_name AS userName, password, sex, identity_card AS identityCard, create_time AS createTime, create_by AS createBy, update_time AS updateTime, update_by AS updateBy, status </sql> </mapper>
八、编写配置文件
spring.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"> <!-- 引入属性文件 --> <context:property-placeholder location="classpath:config.properties"/> <!-- Service包(自动注入) --> <context:component-scan base-package="com.blog.service"/> <import resource="classpath:spring/spring-mybatis.xml"/> </beans>
spring-mybatis.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:cache="http://www.springframework.org/schema/cache" xsi:schemaLocation=" http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"> <!-- 应用spring-cache注解功能 --> <cache:annotation-driven cache-manager="cacheManager" /> <!-- 配置数据源 --> <bean name="defaultDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="url" value="${jdbc_url}"/> <property name="username" value="${jdbc_username}"/> <property name="password" value="${jdbc_password}"/> <!-- 初始化连接大小 --> <property name="initialSize" value="0"/> <!-- 连接池最大使用连接数量 --> <property name="maxActive" value="20"/> <!-- 连接池最大空闲 --> <property name="maxIdle" value="20"/> <!-- 连接池最小空闲 --> <property name="minIdle" value="0"/> <!-- 获取连接最大等待时间 --> <property name="maxWait" value="60000"/> <property name="validationQuery" value="${validationQuery}"/> <property name="testOnBorrow" value="false"/> <property name="testOnReturn" value="false"/> <property name="testWhileIdle" value="true"/> <!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000"/> <!-- 配置一个连接在池中最小生存的时间,单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="25200000"/> <!-- 打开removeAbandoned功能 --> <property name="removeAbandoned" value="true"/> <!-- 1800秒,也就是30分钟 --> <property name="removeAbandonedTimeout" value="1800"/> <!-- 关闭abanded连接时输出错误日志 --> <property name="logAbandoned" value="true"/> <!-- 监控数据库 --> <property name="filters" value="mergeStat"/> </bean> <bean id="druidDynamicDataSource" class="com.blog.datasource.DruidDynamicDataSource"> <property name="defaultTargetDataSource" ref="defaultDataSource" /> <property name="targetDataSources"> <map> <entry key="defaultDataSource" value-ref="defaultDataSource"/> <!-- 这里还可以加多个dataSource --> </map> </property> </bean> <!-- Spring整合Mybatis,更多查看文档:http://mp.baomidou.com --> <bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean"> <property name="dataSource" ref="druidDynamicDataSource" /> <!-- 自动扫描Mapping.xml文件 --> <property name="mapperLocations" value="classpath:mybatis/system/*.xml"/> <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/> <property name="typeAliasesPackage" value="com.blog.entity"/> <property name="plugins"> <array> <!-- 分页插件配置 --> <bean id="paginationInterceptor" class="com.baomidou.mybatisplus.plugins.PaginationInterceptor"> </bean> </array> </property> <!-- 全局配置注入 --> <property name="globalConfig" ref="globalConfig" /> </bean> <bean id="globalConfig" class="com.baomidou.mybatisplus.entity.GlobalConfiguration"> <!-- AUTO->`0`("数据库ID自增") INPUT->`1`(用户输入ID") ID_WORKER->`2`("全局唯一ID") UUID->`3`("全局唯一ID") --> <property name="idType" value="2" /> <!-- MYSQL->`mysql` ORACLE->`oracle` DB2->`db2` H2->`h2` HSQL->`hsql` SQLITE->`sqlite` POSTGRE->`postgresql` SQLSERVER2005->`sqlserver2005` SQLSERVER->`sqlserver` --> <!-- Oracle需要添加该项 --> <!-- <property name="dbType" value="oracle" /> --> <!-- 全局表为下划线命名设置 true --> <!-- <property name="dbColumnUnderline" value="true" /> --> <!-- <property name="metaObjectHandler"> <bean class="com.lms.common.MyMetaObjectHandler" /> </property> --> </bean> <!-- MyBatis 动态扫描 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.blog.mapper"/> </bean> <!-- 配置事务管理 --> <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="druidDynamicDataSource"/> </bean> <!-- 事务管理 属性 --> <tx:advice id="transactionAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="add*" propagation="REQUIRED"/> <tx:method name="append*" propagation="REQUIRED"/> <tx:method name="save*" propagation="REQUIRED"/> <tx:method name="update*" propagation="REQUIRED"/> <tx:method name="modify*" propagation="REQUIRED"/> <tx:method name="edit*" propagation="REQUIRED"/> <tx:method name="insert*" propagation="REQUIRED"/> <tx:method name="delete*" propagation="REQUIRED"/> <tx:method name="remove*" propagation="REQUIRED"/> <tx:method name="repair" propagation="REQUIRED"/> <tx:method name="get*" propagation="REQUIRED" read-only="true"/> <tx:method name="find*" propagation="REQUIRED" read-only="true"/> <tx:method name="load*" propagation="REQUIRED" read-only="true"/> <tx:method name="search*" propagation="REQUIRED" read-only="true"/> <tx:method name="datagrid*" propagation="REQUIRED" read-only="true"/> <tx:method name="*" propagation="REQUIRED" read-only="true"/> </tx:attributes> </tx:advice> <!-- 配置切面 --> <aop:config> <aop:pointcut id="transactionPointcut" expression="execution(* com.blog.service..*.*(..))"/> <aop:advisor pointcut-ref="transactionPointcut" advice-ref="transactionAdvice"/> </aop:config> <!-- 配置ehcache管理器--> <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager"> <property name="cacheManager" ref="ehcache"></property> </bean> <bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"> <property name="configLocation" value="classpath:ehcache-setting.xml"></property> </bean> </beans>
spring-mvc.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- Controller包(自动注入) --> <context:component-scan base-package="com.blog.controller"/> <mvc:default-servlet-handler/> <!-- FastJson注入 --> <mvc:annotation-driven> <mvc:message-converters register-defaults="true"> <bean id="fastJsonHttpMessageConverter" class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>text/html;charset=UTF-8</value> <value>application/json;charset=UTF-8</value> </list> </property> </bean> </mvc:message-converters> </mvc:annotation-driven> <!-- 上传限制 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 上传文件大小限制为31M,31*1024*1024 --> <property name="maxUploadSize" value="32505856"/> </bean> </beans>
config.properties
validationQuery=SELECT 1 jdbc_url=jdbc:mysql://localhost:3306/blog_test?useUnicode=true&characterEncoding=UTF-8 jdbc_username=root jdbc_password=1234
ehcache-setting.xml
<?xml version="1.0" encoding="UTF-8"?> <ehcache> <!-- 指定一个文件目录,当EhCache把数据写到硬盘上时,将把数据写到这个文件目录下 --> <!-- <diskStore path="D://cache//java-cache"/> --> <diskStore path="java.io.tmpdir"/> <!-- 设定缓存的默认数据过期策略 --> <defaultCache maxElementsInMemory="10000" eternal="false" overflowToDisk="true" timeToIdleSeconds="10" timeToLiveSeconds="20" diskPersistent="false" diskExpiryThreadIntervalSeconds="120"/> <cache name="cacheTest" maxElementsInMemory="1000" eternal="false" overflowToDisk="true" timeToIdleSeconds="100" timeToLiveSeconds="200"/> </ehcache>
关于diskstore配置说明:
1、diskStore元素是可选的,非必须的。如果不使用磁盘存储,只需要将diskStore注释掉即可;如果使用,需要在ehcache.xml文件中的ehcahce元素下的定义一个diskStore元素并指定其path属性。
2、由diskStore元素是定义在ehcache元素下我们看出diskStore在CacheManager范围内是共享的,其是线程安全的
3、对于任何缓存,如果你已经激活了overflowToDisk或diskPersistent,就要配置磁盘存储器。
(关于overflowToDisk或diskPersistent的配置,详见配置文件ehcache.xml详解(1) )
4、DiskStore中驱除元素跟MemoryStore中驱除元素的规则是不一样的。当往DiskStore中添加元素且此时DiskStore中的容量已经超出限制时将采用LFU(最不常用)驱除规则将对应的元素进行删除,而且该驱除规则是不可配置的(通过cache中的diskExpiryThreadIntervalSeconds属性完成)
5、path属性如果是下述Java系统属性之一,他将会被运行中的VM中的值替换。为了向后兼容,这些应该被特别规定,而不会被${token}替换语法封闭。
6、path属性可以配置的目录有:
user.home(用户的家目录)
user.dir(用户当前的工作目录)
java.io.tmpdir(默认的临时目录)
ehcache.disk.store.dir(ehcache的配置目录)
绝对路径(如:d://javastore)
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD SQL Map Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <!-- | plugins在配置文件中的位置必须符合要求,否则会报错,顺序如下: | properties?, settings?, | typeAliases?, typeHandlers?, | objectFactory?,objectWrapperFactory?, | plugins?, | environments?, databaseIdProvider?, mappers? |--> <configuration> <!-- | 全局配置设置 | | 可配置选项 默认值, 描述 | | aggressiveLazyLoading true, 当设置为‘true’的时候,懒加载的对象可能被任何懒属性全部加载。否则,每个属性都按需加载。 | multipleResultSetsEnabled true, 允许和不允许单条语句返回多个数据集(取决于驱动需求) | useColumnLabel true, 使用列标签代替列名称。不同的驱动器有不同的作法。参考一下驱动器文档,或者用这两个不同的选项进行测试一下。 | useGeneratedKeys false, 允许JDBC 生成主键。需要驱动器支持。如果设为了true,这个设置将强制使用被生成的主键,有一些驱动器不兼容不过仍然可以执行。 | autoMappingBehavior PARTIAL, 指定MyBatis 是否并且如何来自动映射数据表字段与对象的属性。PARTIAL将只自动映射简单的,没有嵌套的结果。FULL 将自动映射所有复杂的结果。 | defaultExecutorType SIMPLE, 配置和设定执行器,SIMPLE 执行器执行其它语句。REUSE 执行器可能重复使用prepared statements 语句,BATCH执行器可以重复执行语句和批量更新。 | defaultStatementTimeout null, 设置一个时限,以决定让驱动器等待数据库回应的多长时间为超时 | --> <settings> <!-- 这个配置使全局的映射器启用或禁用缓存 --> <setting name="cacheEnabled" value="true"/> <!-- 全局启用或禁用延迟加载。当禁用时,所有关联对象都会即时加载 --> <setting name="lazyLoadingEnabled" value="true"/> <setting name="multipleResultSetsEnabled" value="true"/> <setting name="useColumnLabel" value="true"/> <setting name="defaultExecutorType" value="REUSE"/> <setting name="defaultStatementTimeout" value="25000"/> </settings> <plugins> <!-- SQL 执行分析拦截器 stopProceed 发现全表执行 delete update 是否停止运行 --> <plugin interceptor="com.baomidou.mybatisplus.plugins.SqlExplainInterceptor"> <property name="stopProceed" value="false" /> </plugin> <!-- SQL 执行性能分析,开发环境使用,线上不推荐。 maxTime 指的是 sql 最大执行时长 --> <plugin interceptor="com.baomidou.mybatisplus.plugins.PerformanceInterceptor"> <property name="maxTime" value="100" /> <!--SQL是否格式化 默认false--> <property name="format" value="true" /> </plugin> </plugins> </configuration>
log4j.properties
#config root logger log4j.rootLogger = INFO,system.out log4j.appender.system.out=org.apache.log4j.ConsoleAppender log4j.appender.system.out.layout=org.apache.log4j.PatternLayout log4j.appender.system.out.layout.ConversionPattern=[Log]%-d{yyyy-MM-dd HH:mm:ss} %5p[%F:%L]:%m%n #log4j.appender.system.out.layout.ConversionPattern=[Log] %5p[%F:%L]:%m%n #config this Project.file logger log4j.logger.thisProject.file=INFO,thisProject.file.out log4j.appender.thisProject.file.out=org.apache.log4j.DailyRollingFileAppender log4j.appender.thisProject.file.out.File=pmslogout.log log4j.appender.thisProject.file.out.layout=org.apache.log4j.PatternLayout log4j.appender.thisProject.file.out.layout.ConversionPattern=[Log]%-d{yyyy-MM-dd HH:mm:ss} %5p[%F:%L]:%m%n log4j.appender.thisProject.file.append=true
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>Blog</display-name> <!-- 欢迎页 --> <welcome-file-list> <welcome-file>views/login.html</welcome-file> </welcome-file-list> <!-- 加载配置文件 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/spring.xml</param-value> </context-param> <!-- 字符过滤器 拦截所有 --> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 上下文监听 --> <listener> <description>Spring监听器</description> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 前端控制器 拦截 --> <servlet> <servlet-name>SpringMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <description>SpringMVC</description> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>SpringMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- session过期时间 --> <session-config> <session-timeout>30</session-timeout> </session-config> </web-app>
九、运行项目,如果控制台五报错,就通过PostMan接口测试
PostMan可运行多次 发现控制台始终都只打印一次就表示缓存成功
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原文地址:https://www.cnblogs.com/youcong/p/9931314.html