spring、springmvc、mybatis整合筆記

時間 2019-11-12

標籤 spring springmvc mybatis 整合筆記欄目 Spring 简体版

原文原文鏈接

　　這段時間上一個項目剛作完，下一個項目還沒開始，趁這個時候來認真總結一下上個項目使用的ssm開發框架。因爲，項目中關於使用ssm這部分的代碼和配置是咱們項目的總體架構師一個獨立完成的，咱們只負責業務部分的代碼，調用他寫好的後臺，因此涉及到ssm具體使用的我都沒參與，以前簡單的作過s（struts）sh，對於ssm不是很熟悉，因此，這段時間從頭至尾獨立搭建一個ssm框架的web應用。html

　　首先，spring、springmvc、mybatis所須要的jar包準備好，導入到新建web項目的lib中，而後開始搭建java源代碼（src）下的結構，我在這裏用到的是相似ssh的結構mapper.java、mapper.xml、dao、daoImpl、service、serviceImpl、controller。項目目錄結構以下。java

　　接下來，寫配置文件。mysql

　　web.xmlweb

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>SSM</display-name>
  
  <!-- spring配置文件加載 -->
  <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:resources/spring-config.xml</param-value>
  </context-param>
  
  <!-- Spring ApplicationContext 載入 -->
  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <!-- mvc控制器 -->
  <servlet>
      <servlet-name>dispatcher</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
          <param-name>contextConfigLocation</param-name>
            <param-value>
                classpath:resources/mvc-config.xml
            </param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
      <servlet-name>dispatcher</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <!-- 默認顯示的首頁面 -->
  <welcome-file-list>
    <welcome-file>login.html</welcome-file>
    <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>
</web-app>

-----------------------------------------------spring.xml--------------------------------------ajax

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd 
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop.xsd 
    http://www.springframework.org/schema/tx  
    http://www.springframework.org/schema/tx/spring-tx.xsd 
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd">
    
    <!-- 掃描DAO和SERVICE包，controller包在springmvc中掃描 -->
    <context:component-scan base-package="com.liusk.serviceImpl,com.liusk.daoImpl" />
    
    <!-- 數據源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8"></property>
        <property name="user" value="root"></property>
        <property name="password" value="java"></property>
        <property name="minPoolSize" value="5"></property>
        <property name="maxPoolSize" value="100"></property>
    </bean>
    
    <!-- 會話工廠 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:resources/mybatis-config.xml"></property>
        <property name="mapperLocations" value="classpath:com/liusk/mapper/*.xml"></property>
    </bean>
    
    <!-- 事務處理 -->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <tx:method name="insert*" propagation="REQUIRED"></tx:method>
            <tx:method name="delete*" propagation="REQUIRED"></tx:method>
            <tx:method name="update*" propagation="REQUIRED"></tx:method>
            <tx:method name="select*" propagation="SUPPORTS"></tx:method>
        </tx:attributes>
    </tx:advice>
    <aop:config>
        <aop:pointcut id="serviceCut" expression="execution(public * com.liusk.service.*.*(..))" />
        <aop:advisor pointcut-ref="serviceCut" advice-ref="txAdvice" />
    </aop:config>
    
    <!-- spring和mybatis的整合 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.liusk.mapper"/>
    </bean>
    
</beans>

　　關於spring和mybatis整合的方法有不少種，上面xml中是最基礎的配置，還能夠加入其它的限制條件，這個能夠單獨到百度上搜更詳細的解釋。spring

-------------------------------------------------------mvc-config.xml------------------------------------------------sql

<?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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <!-- 掃描controller包 -->
    <context:component-scan base-package="com.liusk.controller"></context:component-scan>
    
    <!-- 完成請求和註解POJO的映射 -->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
    
    <!-- 頁面轉向解析 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/" />
        <property name="suffix" value=".jsp" />
    </bean>
    
    <!-- 支持文件上傳 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    </bean>
    
</beans>

　　在mvcconfig中，最重要的工做是控制轉發，這個配置文件中作了最簡單的轉發操做，只能轉發頁面，若是想要經過ajax實現轉發數據，那麼須要重寫ViewResolver來實現這個功能。數據庫

--------------------------------------------------------mybatis-config.xml-------------------------------------express

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    
    <!-- 定義別名 -->
    <typeAliases>
        <typeAlias type="com.liusk.entity.User" alias="User"/>
    </typeAliases>
    
</configuration>

　　至此，配置文件部分完畢。session

　　下面是src源碼

----------------------------------------------------------User.java------------------------------------------------------

package com.liusk.entity;

public class User {
    private String userId;
    private String username;
    private String password;
    
    public String getUserId() {
        return userId;
    }
    public void setUserId(String userId) {
        this.userId = userId;
    }
    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;
    }
}

　　mybatis的實體類和hibernate實體類的不一樣是mybatis的實體類不須要加載到spring的beanFactory中，而是經過操做數據庫的mapper來持久化數據。

-----------------------------------------------------------UserMapper.java------------------------------------------

package com.liusk.mapper;

import java.util.List;

import com.liusk.entity.User;

public interface UserMapper {
    public List<User> selectUser(User user);
    public void insertUser(User user);
    public List<User> selectUserByUserName(String username);
}

　　UserMapper.java這個文件是在什麼時候被加載到spring中的呢？咱們知道它是在daoImpl中使用到的，並且是註解到daoImpl中的，因此它必定在以前已經被加載到beanFactory中了，我在第一次配置的時候也不是太清楚它是何時進入beanFactory由於它身上沒有任何註解，因此，根據spring配置文件中spring和mybatis的整合，推測UserMapper.java就是在

這個地方被加載的。這個下面有詳細解答。

----------------------------------------------------------UserMapper.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.liusk.mapper.UserMapper">
    
    <resultMap type="com.liusk.entity.User" id="userMap">
        <id column="user_id" property="userId" ></id>
        <result column="user_name" property="username"/>
        <result column="password" property="password"/>
    </resultMap>
    
    <select id="selectUser" parameterType="User" resultType="java.util.List" resultMap="userMap">
        select * from user where user_name = #{username} and password = #{password}
    </select>
    
    <select id="selectUserByUserName" parameterType="java.lang.String" resultType="java.util.List" resultMap="userMap">
        select * from user where user_name = #{username}
    </select>
    
    <insert id="insertUser" parameterType="User">
        insert into user values (#{userId},#{username},#{password})
    </insert>
    
</mapper>

　　該配置文件中namespace對應接口的路徑，也就是mapper.java的路徑，不然拋出異常。因此這裏牽涉到一個問題：UserMapper.java究竟是什麼時候加載到beanFactory的？爲何會用這個問題呢，應爲UserMapper.xml在spring的sessionFactory初始化的時候被掃描並加載到spring，那麼這個時候會不會根據這個命名空間同時把UserMapper.java加載到beanFactory中呢，其實我沒有看過spring和mybatis的源碼，因此不太瞭解。根據猜想和驗證，UserMapper.java不是在這個時候被加載的。

------------------------------------------------------UserDAO--------------------------------------------

package com.liusk.dao;

import java.util.List;


import com.liusk.entity.User;

public interface UserDAO {
    
    public List<User> selectUser(User user);
    
    public void insertUser(User user);
    
    public List<User> selectUserByUserName(String username);
}

這個UserDAO的存在就是在向個人第一個項目使用ssh致敬的，其實這個UserDAO他就是個接口，能夠不存在，下面的UserService也是這個道理。

------------------------------------------------------UserDAOImpl----------------------------------------

package com.liusk.daoImpl;

import java.util.List;

import org.safehaus.uuid.UUIDGenerator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.liusk.dao.UserDAO;
import com.liusk.entity.User;
import com.liusk.mapper.UserMapper;

@Repository
public class UserDAOImpl implements UserDAO {
    
    @Autowired
    private UserMapper userMapper;
    
    private UUIDGenerator uuidGen = UUIDGenerator.getInstance();
    
    @Override
    public List<User> selectUser(User user) {
        return userMapper.selectUser(user);
    }

    @Override
    public void insertUser(User user) {
        String userId = uuidGen.generateTimeBasedUUID().toString();
        if(user.getUserId()==null||user.getUserId()=="")
            user.setUserId(userId.replace("-", ""));
        System.out.println(user.getUserId());
        userMapper.insertUser(user); 
    }

    @Override
    public List<User> selectUserByUserName(String username) {
        return userMapper.selectUserByUserName(username);        
    }
    
}

UserDAOImpl和UserServiceImpl相似，都是實現類，作具體的數據持久化操做。

--------------------------------------------------------UserService-----------------------------------------

package com.liusk.service;

import java.util.List;


import com.liusk.entity.User;

public interface UserService {
    
    public void insertUser(User user);
    
    public List<User> selectUser(User user);
    
    public boolean existUser(String username);
    
}

--------------------------------------------------------UserServiceImpl--------------------------------------

package com.liusk.serviceImpl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.liusk.dao.UserDAO;
import com.liusk.entity.User;
import com.liusk.service.UserService;

@Service
public class UserServiceImpl implements UserService{

    @Autowired
    private UserDAO userDAO;
    
    @Override
    public void insertUser(User user) {
        userDAO.insertUser(user);
    }

    @Override
    public List<User> selectUser(User user) {
        return userDAO.selectUser(user);
    }

    @Override
    public boolean existUser(String username) {
        List<User> userList = userDAO.selectUserByUserName(username);
        if(userList.size()>0)
            return true;
        else
            return false;
    }

}

-------------------------------------------------------UserController-------------------------------------

package com.liusk.controller;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.liusk.base.UserCounts;
import com.liusk.entity.User;
import com.liusk.service.UserService;

@Controller
@RequestMapping("user")
public class UserController {
    
    @Autowired
    private UserService userService;
    
    @SuppressWarnings("rawtypes")
    @RequestMapping("login.do")
    public ModelAndView login(String username,String password,HttpServletRequest request){
        User user = new User();
        user.setUsername(username);
        user.setPassword(password);
        List<User> userList = userService.selectUser(user);
        if(userList.size()>0){
            request.setAttribute("userList", userList);return new ModelAndView("index");
        }else
            return new ModelAndView("login");
    }
    
    @RequestMapping("regist.do")
    public ModelAndView regist(String username,String password,HttpServletRequest request){
        User user = new User();
        user.setUsername(username);
        user.setPassword(password);
        boolean flag = true;
        flag = userService.existUser(username);
        if(!flag)
            userService.insertUser(user);
        return new ModelAndView("login");
    }
}

　　至此，src下的java源碼完畢。

　　下面是jsp頁面部分。

-----------------------------------------------------login.jsp--------------------------------------------------

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    
<%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href=" <%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登陸頁面</title>

</head>
<body>
<div>
    <div>    
        <form action="user/login.do" method="post">
            <label>用戶名：</label>
            <input type="text" name="username" />
            <label>密碼:</label>
            <input type="password" name="password"/>
            <button type="submit">登陸</button>
            <button type="reset" >重置</button>        
        </form>    
    </div>
    
</div>

</body>
</html>

-----------------------------------------------------index.jsp--------------------------------------------------------

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="com.liusk.entity.User" %>
<%@ page import="java.util.List" %>

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<%
    List<User> userList = (List<User>)request.getAttribute("userList");%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href=" <%=basePath%>"/>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>index</title>
</head>
<body>
<div>
    <p>歡迎<%=userList.get(0).getUsername() %>!</p>
</div>
<div align="center" style="width:200;height:200">
    <form action="user/regist.do" method="post">
        <input type="text" name="username"/>
        <input type="text" name="password"/>
        <button type="submit">提交</button>
        <button type="reset">重置</button>
    </form>
</div>
</body>
</html>