Maven - 构建ssh2项目 / 憋错料

一、数据库准备

1.创建数据库maven
create database maven character set utf8 collate utf8_general_ci; //use maven;

2.创建用户表

create table t_users(
id int primary key auto_increment,
username varchar(30) not null,
password varchar(50) not null,
constraint unq_users_username unique(username)
);

3.插入测试数据

insert into t_users(username,password) values(‘admin‘, md5(‘admin‘));
insert into t_users(username,password) values(‘user‘, md5(‘user‘));

二、项目构建

1.创建简单Maven项目

2.在webapps下创建WEB-INF目录，并在WEB-INF下创建web.xml，

3.复制porm.xml文件内容(jar包的准备)

4.右击项目-->Maven-->Update Project（解决eclipse报错）

三、Dao层构建

1.编写实体类User.java（可以使用Hibernate反向工程）

package com.hao.entity;

// Generated 2017-8-6 12:57:28 by Hibernate Tools 4.0.0

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;

/**
* TUsers generated by hbm2java
*/
@Entity
@Table(name = "t_users", catalog = "maven", uniqueConstraints = @UniqueConstraint(columnNames = "username"))
public class User implements java.io.Serializable {

private static final long serialVersionUID = 1L;

private Integer id;
private String username;
private String password;

public User() {
}

public User(String username, String password) {
this.username = username;
this.password = password;
}

@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "id", unique = true, nullable = false)
public Integer getId() {
return this.id;
}

public void setId(Integer id) {
this.id = id;
}

@Column(name = "username", unique = true, nullable = false, length = 30)
public String getUsername() {
return this.username;
}

public void setUsername(String username) {
this.username = username;
}

@Column(name = "password", nullable = false, length = 50)
public String getPassword() {
return this.password;
}

public void setPassword(String password) {
this.password = password;
}

}

2.Dao层代码抽取以及UserDao的编写

2.1 BaseDao接口

package com.hao.dao.base;

import java.io.Serializable;
import java.util.List;

public interface BaseDao<T> {

void save(T entity);
void delete(T entity);
void deleteById(Serializable id);
void update(T entity);
T findById(Serializable id);
List<T> findAll();
}

2.2 BaseDaoImpl实现类

package com.hao.dao.base.impl;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate5.support.HibernateDaoSupport;

import com.hao.dao.base.BaseDao;

public class BaseDaoImpl<T> extends HibernateDaoSupport implements BaseDao<T> {

private Class<T> entityClass;

@SuppressWarnings("unchecked")
public BaseDaoImpl() {

//获取子类对象的父类类型
ParameterizedType superClass = (ParameterizedType) this.getClass().getGenericSuperclass();
//获得在父类类型上声明的反省数组
Type[] genericTypes = superClass.getActualTypeArguments();
//第一个泛型即为实体类型
entityClass = (Class<T>) genericTypes[0];
}

@Override
public void save(T entity) {
getHibernateTemplate().save(entity);
}

@Override
public void delete(T entity) {
getHibernateTemplate().delete(entity);
}

@Override
public void deleteById(Serializable id) {
T entity = getHibernateTemplate().load(entityClass, id);
getHibernateTemplate().delete(entity);
}

@Override
public void update(T entity) {
getHibernateTemplate().update(entity);
}

@Override
public T findById(Serializable id) {
return getHibernateTemplate().get(entityClass, id);
}

@Override
public List<T> findAll() {
return getHibernateTemplate().loadAll(entityClass);
}

/**
* HibernateDao接口在使用前必须注入SessionFactory
* @param sessionFactory
*/
@Autowired
public void setSF(SessionFactory sessionFactory){
super.setSessionFactory(sessionFactory);
}
}

2.3 UserDao接口

package com.hao.dao;

import com.hao.dao.base.BaseDao;
import com.hao.entity.User;

public interface UserDao extends BaseDao<User>{

User login(String username, String password);
}

2.4 UserDaoImpl实现类

package com.hao.dao.impl;

import java.util.List;

import org.springframework.stereotype.Repository;

import com.hao.dao.UserDao;
import com.hao.dao.base.impl.BaseDaoImpl;
import com.hao.entity.User;

@Repository("userDao")
public class UserDaoImpl extends BaseDaoImpl<User> implements UserDao{

@Override
public User login(String username, String password) {

@SuppressWarnings("unchecked")
List<User> user = (List<User>) getHibernateTemplate().find("from User u where u.username=? and u.password=?", username, password);

if(user == null || user.size() < 1){
return null;
}else{
return user.get(0);
}
}
}

2.5 导入MD5工具类，Dao的单元测试和Service层要使用

package com.hao.utils;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {
/**
* 使用md5的算法进行加密
*/
public static String md5(String plainText) {
byte[] secretBytes = null;
try {
secretBytes = MessageDigest.getInstance("md5").digest(
plainText.getBytes());
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("没有md5这个算法！");
}
String md5code = new BigInteger(1, secretBytes).toString(16);// 16进制数字
// 如果生成数字未满32位，需要前面补0
for (int i = 0; i < 32 - md5code.length(); i++) {
md5code = "0" + md5code;
}
return md5code;
}

public static void main(String[] args) {
System.out.println(md5("123"));
}

}

3.注意BaseDao继承的HibernateDaoSupport要选择正确的包，其有分hibernate3,hibernate4和hibernate5，导错包会抛异常

四、配置spring-dao基础

1.在applicationContext.xml中配置Spring组件扫描

<context:component-scan base-package="com.hao"/>

2.在applicationContext.xml中配置数据源

<context:property-placeholder location="classpath:db.properties"/>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driverClass}"/>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"/>
<property name="user" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>

3.编写db.properties文件，存放在类路径下

jdbc.jdbcUrl=jdbc:mysql://localhost:3306/maven
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=h66666

五、Spring整合Hibernate

1.在applicationContext.xml中配置SessionFactory，注意class属性也要选择正确的包

<bean name="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean" >

<property name="dataSource" ref="dataSource" ></property>

<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect" >org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql" >true</prop>
<prop key="hibernate.format_sql" >true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>

</props>
</property>

<property name="packagesToScan" value="com.hao.entity"></property>
</bean>

2.在applicationContext.xml中配置核心事务管理器

<bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>

3.开启注解事务（也可以使用声明式事务）

<tx:annotation-driven transaction-manager="transactionManager" />

4.由于我采用注解定义Hibernate实体类，因此映射注解元数据使用的是packagesToScan属性

5.如果使用的是hbm.xml文件映射元数据，可以使用mappingLocations（建议）或mappingDirectoryLocations

六、配置log4j日志环境

以下为log4j.properties的内容：

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=D:\\temp\\mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### fatal error warn info debug debug trace
log4j.rootLogger=debug, stdout
#log4j.logger.org.hibernate=INFO
#log4j.logger.org.hibernate.type=INFO

七、DAO层单元测试

1.注意，由于Spring的事务配置Service层，因此Dao层不具有事务性，因此单元测试必须添加@Transactional注解
2.经过测试，dao层的单元测试默认会执行事务回滚（不知为何，可能是因为没有配置@Transaction注解的参数？）
3.若想要不进行回滚而在数据库看到结果（如插入等），需添加@Rollback(false)
4.UserDao的测试代码

package com.hao.dao;

import junit.framework.Assert;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.annotation.Rollback;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.annotation.Transactional;

import com.hao.entity.User;
import com.hao.utils.MD5Utils;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext.xml"})
@Transactional
@Rollback(false)
public class UserDaoTest {

@Autowired
UserDao userDao;

@Test
public void testLogin(){

Assert.assertNotNull(userDao.login("admin", MD5Utils.md5("admin")));
Assert.assertNull(userDao.login("admin", MD5Utils.md5("pass")));
Assert.assertNotNull(userDao.login("user", MD5Utils.md5("user")));

}

@Test
public void testSave(){
User u = new User();
u.setUsername("dao");
u.setPassword("dao");
userDao.save(u);
}

}

八、编写Service层代码

1.UserService接口

package com.hao.service;

import com.hao.entity.User;

public interface UserService {

User login(User user);

void save(User user);

}

2.UserServiceImpl实现类，要求使用注解配置事务

package com.hao.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import com.hao.dao.UserDao;
import com.hao.entity.User;
import com.hao.service.UserService;
import com.hao.utils.MD5Utils;

@Service("userService")
@Transactional(isolation = Isolation.REPEATABLE_READ, propagation = Propagation.REQUIRED, readOnly = true)
public class UserServiceImpl implements UserService{

private UserDao userDao;

@Autowired
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}

@Override
public User login(User user) {
String pass = MD5Utils.md5(user.getPassword());
return userDao.login(user.getUsername(), pass);
}

@Override
@Transactional(isolation = Isolation.REPEATABLE_READ, propagation = Propagation.REQUIRED, readOnly = false)
public void save(User user) {
userDao.save(user);
}
}

九、编写Service层的单元测试

1.由于Service配置了Spring的事务，因此基于Service的单元测试无需再添加@Transactional注解
2.经测试，Service层的单元测试默认不具有回滚性（可能与@Transaction注解有关）
3.并且，即使在测试类上添加注解@rollback(true)注解也无法回滚（不知原因）
4.UserService测试代码

package com.hao.service;

import junit.framework.Assert;

import com.hao.entity.User;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
@Rollback(true)
public class UserServiceTest {

@Autowired
UserService userService;

@Test
public void testLogin(){

User u1 = new User();
u1.setUsername("admin");
u1.setPassword("admin");

User u2 = new User();
u2.setUsername("admin");
u2.setPassword("pass");

User u3 = new User();
u3.setUsername("user");
u3.setPassword("user");

Assert.assertNotNull(userService.login(u1));
Assert.assertNull(userService.login(u2));
Assert.assertNotNull(userService.login(u3));
}

@Test
public void testSave(){

User u = new User();
u.setUsername("service");
u.setPassword("service");

userService.save(u);

}

十、Action层的抽取以及编写UserAction

1.抽取BaseAction

package com.hao.action.base;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Map;

import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class BaseAction<T> extends ActionSupport implements ModelDriven<T>, RequestAware, SessionAware{

private static final long serialVersionUID = 1L;

protected Map<String, Object> request;
protected Map<String, Object> session;
protected T model;

@Override
public void setRequest(Map<String, Object> request) {
this.request = request;
}

@Override
public void setSession(Map<String, Object> session) {
this.session = session;
}

@Override
public T getModel() {
return model;
}

public BaseAction() {

//获取父类
ParameterizedType genericSuperclass = (ParameterizedType) this.getClass().getGenericSuperclass();
//获取父类的泛型数组
Type[] types = genericSuperclass.getActualTypeArguments();
//取得第一个泛型，即Model的类型
@SuppressWarnings("unchecked")
Class<T> entityClass = (Class<T>) types[0];
try {
model = entityClass.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}

}

2.UserAction代码编码，继承于BaseAction

package com.hao.action;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;

import com.hao.action.base.BaseAction;
import com.hao.entity.User;
import com.hao.service.UserService;

@Controller("userAction")
@Scope("prototype")
public class UserAction extends BaseAction<User>{

private static final long serialVersionUID = 1L;

public String login(){
System.out.println("-------------------------------------------------------"+this);
User user = userService.login(model);
if(user == null){
request.put("errorInfo", "用户名或密码错误");
return LOGIN;
}
session.put("loginUser", user);
return SUCCESS;
}

@Autowired
private UserService userService;

public UserService getUserService() {
return userService;
}

public void setUserService(UserService userService) {
this.userService = userService;
}

}

十一、配置struts2，并整合到Spring

1.在web.xml中配置struts2过滤器

<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

2.配置struts.xml，其中Action的类名写成Spring中定义的实体名（Spring与Struts2的整合）

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<package name="hao" namespace="/" extends="struts-default">
<action name="userAction_*" class="userAction" method="{1}">
<result>/success.jsp</result>
<result name="login">/index.jsp</result>
</action>
</package>

</struts>

3.注意将struts2整合到Spring时，Action的scope必须为prototype，采用bean的prototy属性或者@Scope注解进行配置
4.为什么必须是prototype？这是由struts2的架构所决定的！

十二、（可选）如果Action是以解耦方式编写的（即不依赖容器产生HttpServletRequest和HttpServletResponse），还可以对Action层进行单元测试

1.对Action层做单元测试相当于模拟一次请求而进行对应的方法调用
2.对Action进行单元测试的前提是，在对Action进行编码时，采用解耦方式获取request,response,session等（即拿到的是一个Map），这样就不需要Servlet便可以执行测试
3.UserAction测试代码

package com.hao.action;

import java.util.HashMap;
import java.util.Map;

import junit.framework.Assert;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationCOntext.xml")
public class UserActionTest {

@Autowired
UserAction userAction;

@Before
public void init(){
//模拟容器，提供Request和Session
Map<String, Object> request = new HashMap<String, Object>();
Map<String, Object> session = new HashMap<String, Object>();
userAction.setRequest(request);
userAction.setSession(session);
}

@Test
public void testLogin(){

//模拟提供请求参数
userAction.getModel().setUsername("admin");
userAction.getModel().setPassword("admin");
//模拟一次登录请求
Assert.assertEquals(UserAction.SUCCESS, userAction.login());

//模拟提供请求参数
userAction.getModel().setUsername("admin");
userAction.getModel().setPassword("pass");
//模拟错误的用户名密码登录请求
Assert.assertEquals(UserAction.LOGIN, userAction.login());
}

}

十三、Spring整合到Web环境

1.在web.xml配置Spring上下文随Web上下文启动而启动

<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>

2.扩展Session的作用域到请求结束(web.xml)，注意选择正确的Hibernate版本

<filter>
<filter-name>openSessionInView</filter-name>
<filter-class>org.springframework.orm.hibernate5.support.OpenSessionInViewInterceptor</filter-class>
</filter>
<filter-mapping>
<filter-name>openSessionInView</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

3.启动Tomcat，访问主页，请求对应的Action即可

时间： 2024-11-08 18:52:31

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