首先创建maven项目
1.maven添加各种依赖包
<!-- 数据库连接池 --> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1.2</version> </dependency> <!-- Mybatis与Spring的包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <!-- Mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.2</version> </dependency> <!-- Spring jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.1.6.RELEASE</version> </dependency> <!-- 动态代理 --> <dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>2.2</version> </dependency> <!-- 数据库驱动 --> <dependency> <groupId> mysql</groupId> <artifactId> mysql-connector-java</artifactId> <version> 5.0.5</version> </dependency> <!-- Spring框架 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.1.6.RELEASE</version> </dependency> <!-- SpringMVC框架 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.1.6.RELEASE</version> </dependency>
2.配置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:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<!-- 数据库驱动 -->
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<!-- 连接URL串 -->
<property name="jdbcUrl" value="url" />
<!-- 连接用户名 -->
<property name="user" value="user" />
<!-- 连接密码 -->
<property name="password" value="pass" />
<!-- 初始化连接池时连接数量为5个 -->
<property name="initialPoolSize" value="5" />
<!-- 允许最小连接数量为5个 -->
<property name="minPoolSize" value="5" />
<!-- 允许最大连接数量为20个 -->
<property name="maxPoolSize" value="20" />
<!-- 允许连接池最大生成100个PreparedStatement对象 -->
<property name="maxStatements" value="100" />
<!-- 连接有效时间，连接超过3600秒未使用，则该连接丢弃 -->
<property name="maxIdleTime" value="3600" />
<!-- 连接用完时，一次产生的新连接步进值为2 -->
<property name="acquireIncrement" value="2" />
<!-- 获取连接失败后再尝试10次，再失败则返回DAOException异常 -->
<property name="acquireRetryAttempts" value="10" />
<!-- 获取下一次连接时最短间隔600毫秒，有助于提高性能 -->
<property name="acquireRetryDelay" value="600" />
<!-- 检查连接的有效性，此处小弟不是很懂什么意思 -->
<property name="testConnectionOnCheckin" value="true" />
<!-- 每个1200秒检查连接对象状态 -->
<property name="idleConnectionTestPeriod" value="1200" />
<!-- 获取新连接的超时时间为10000毫秒 -->
<property name="checkoutTimeout" value="10000" />
</bean>
<!-- 创建SqlSessionFactory，同时指定数据源 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:configuration.xml" />
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 自动创建mybatis的代理类的配置 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.ray.model.mapper" />
</bean>
<mvc:annotation-driven />
<!-- 把标记了@Controller注解的类转换为bean -->
<context:component-scan base-package="com.ray.services" />
<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<!-- Spring MVC的跳转配置（我猜的） -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
3.配置web.xml
<servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/spring.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping>
4.配置mybatis自动生成实体（运行maven
install的时候）
首先配置pom.xml
<!--配置常用的属性--> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <entity.target.dir>src/main/java/</entity.target.dir> <dao.resources.dir>src/main/resources/</dao.resources.dir> </properties> <!--自动生成--> <build> <plugins> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.2</version> <dependencies> <!-- 数据库驱动 --> <dependency> <groupId> mysql</groupId> <artifactId> mysql-connector-java</artifactId> <version> 5.0.5</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.4</version> </dependency> </dependencies> <executions> <execution> <id>Generate MyBatis Artifacts</id> <phase>package</phase> <goals> <goal>generate</goal> </goals> </execution> </executions> <configuration> <verbose>false</verbose> <overwrite>false</overwrite> <configurationFile> src/main/resources/mybatis-generator.xml</configurationFile> </configuration> </plugin> <plugin> <artifactId>maven-compiler-plugin</artifactId> <configuration> <encoding>UTF-8</encoding> <source>1.5</source> <target>1.5</target> </configuration> </plugin> </plugins> </build>
配置mybatis-generator.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<context id="DB2Tables" targetRuntime="MyBatis3" defaultModelType="flat">
<plugin type="org.mybatis.generator.plugins.RenameExampleClassPlugin">
<property name="searchString" value="[e|E]xample$" />
<property name="replaceString" value="Criteria" />
</plugin>
<commentGenerator>
<property name="suppressDate" value="true" />
</commentGenerator>
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://127.0.0.1/ray" userId="ray"
password="123456">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- generate Model -->
<javaModelGenerator targetPackage="com.ray.model"
targetProject="${entity.target.dir}">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- 自动生成xml（但是好像一直没有生成功，反正也不用xml） -->
<sqlMapGenerator targetPackage="com.ray.model.mapper"
targetProject="${dao.resources.dir}">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<!-- 自动生成mapper接口, 可以是 ANNOTATEDMAPPER(注解), XMLMAPPER(xml), MIXEDMAPPER(不知道) -->
<javaClientGenerator type="ANNOTATEDMAPPER"
targetPackage="com.ray.model.mapper" implementationPackage="com.ray.model.mapper.impl"
targetProject="${entity.target.dir}">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<table tableName="user" domainObjectName="User">
</table>
</context>
</generatorConfiguration>
5.mybatis配置configuration.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//ibatis.apache.org//DTD Config 3.0//EN"
"http://ibatis.apache.org/dtd/ibatis-3-config.dtd">
<configuration>
<settings>
<!-- 全局映射器启用缓存 -->
<setting name="cacheEnabled" value="true" />
<!-- 查询时，关闭关联对象即时加载以提高性能 -->
<setting name="lazyLoadingEnabled" value="true" />
<!-- 设置关联对象加载的形态，此处为按需加载字段(加载字段由SQL指 定)，不会加载关联表的所有字段，以提高性能 -->
<setting name="aggressiveLazyLoading" value="false" />
<!-- 对于未知的SQL查询，允许返回不同的结果集以达到通用的效果 -->
<setting name="multipleResultSetsEnabled" value="true" />
<!-- 允许使用列标签代替列名 -->
<setting name="useColumnLabel" value="true" />
<!-- 允许使用自定义的主键值(比如由程序生成的UUID 32位编码作为键值)，数据表的PK生成策略将被覆盖 -->
<setting name="useGeneratedKeys" value="true" />
<!-- 给予被嵌套的resultMap以字段-属性的映射支持 -->
<setting name="autoMappingBehavior" value="FULL" />
<!-- 对于批量更新操作缓存SQL以提高性能 -->
<setting name="defaultExecutorType" value="BATCH" />
<!-- 数据库超过25000秒仍未响应则超时 -->
<setting name="defaultStatementTimeout" value="25000" />
</settings>
<!-- 全局别名设置，在映射文件中只需写别名，而不必写出整个类路径 -->
<typeAliases>
<typeAlias alias="User"
type="com.ray.model.User" />
</typeAliases>
<!-- 非注解的sql映射文件配置，如果使用mybatis注解，该mapper无需配置，但是如果mybatis注解中包含@resultMap注解，则mapper必须配置，给resultMap注解使用 -->
<!-- <mappers> <mapper resource="persist/test/orm/test.xml" /> </mappers> -->
</configuration>
6.使用
package com.ray.services;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.ray.model.mapper.UserMapper;
@Controller
public class Test {
@Autowired
private UserMapper mapper;
/**
* 测试有多少条数据
* @param response
*/
@RequestMapping("/getcount.do")
public void count(HttpServletResponse response){
PrintWriter pw = null;
try {
pw = response.getWriter();
pw.write("count:"+mapper.countByExample(null));
} catch (IOException e) {
e.printStackTrace();
}finally{
if(pw != null){
pw.close();
}
}
}
public UserMapper getMapper() {
return mapper;
}
public void setMapper(UserMapper mapper) {
this.mapper = mapper;
}
}
虽然也需要用xml文档来进行配置，但是感觉用注解还是方便了好多，具体代码https://git.oschina.net/raywang2014/JavaEE.git（这个项目配置了最基本的环境，但是项目是分模块的）
时间： 2024-08-28 18:43:15