Spring+Mybatis+Velocity整合（3）：整合Mybatis

正式开始配置关键内容，这是硬货 
1、新建spring配置文件，起名为 applicationContext.xml，放在src/main/resources/spring目录下。 
内容如下：

1<?xml version="1.0" encoding="UTF-8"?>
2<beans xmlns="http://www.springframework.org/schema/beans" 
3    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4    xmlns:context="http://www.springframework.org/schema/context" 
5    xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
6    xmlns:jee="http://www.springframework.org/schema/jee" 
7    xmlns:tx="http://www.springframework.org/schema/tx"
8    xmlns:aop="http://www.springframework.org/schema/aop" 
9    xmlns:mvc="http://www.springframework.org/schema/mvc"
10    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
11    xsi:schemaLocation="
12        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
13        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
14        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
15        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
16        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
17        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
18        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
19        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
20
21    <!--开始配置-->
22</beans>

2、web.xml文件配置

1<context-param>
2    <param-name>contextConfigLocation</param-name>
3     <!-- 上面配置的spring配置文件的路径，区分大小写  -->
4    <param-value>classpath:spring/applicationContext.xml</param-value>
5</context-param>
6
7<listener>
8    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
9</listener>

加入这个用来在启动web容器时，读取spring配置

3.新建数据源的配置文件datasource.properties放在src/main/resources目录下：

1driverClassName=com.mysql.jdbc.Driver
2url=jdbc:mysql://localhost:3306/user?characterEncoding=utf-8
3username=root
4password=1234

4.配置一个duird数据源，在applicationContext.xml中加入：

1    <!--开始配置-->
2
3    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
4        <property name="locations" value="classpath:datasource.properties" />
5    </bean>
6
7    <!-- 配置数据源 -->
8    <bean id="ds"  class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
9        <property name="url"             value="${url}"/>
10        <property name="driverClassName" value="${driverClassName}"/>
11        <property name="username"        value="${username}"/>
12        <property name="password"        value="${password}"/>
13    </bean>

5.配置Mybatis

1    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
2        <property name="dataSource" ref="dataSource"/>
3        <property name="mapperLocations" value="classpath*:mappers/*Mapper.xml"></property>
4    </bean>
5
6    <bean name="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
7        <property name="basePackage" value="com.jczj123.Test3.dao"/>
8    </bean>

6.配置就这么多，下面是代码

model下新建User实体类

1package com.jczj123.Test3.model;
2
3/**
4 * Created by wangkai on 2017/7/9.
5 */
6public class User {
7
8    private Integer id;
9
10    private String username;
11
12    private String password;
13
14    public User(Integer id, String username, String password) {
15        this.id = id;
16        this.username = username;
17        this.password = password;
18    }
19
20    public Integer getId() {
21        return id;
22    }
23
24    public void setId(Integer id) {
25        this.id = id;
26    }
27
28    public String getUsername() {
29        return username;
30    }
31
32    public void setUsername(String username) {
33        this.username = username;
34    }
35
36    public String getPassword() {
37        return password;
38    }
39
40    public void setPassword(String password) {
41        this.password = password;
42    }
43}

在dao下新建一个UserMapper

1package com.jczj123.Test3.dao;
2
3import com.jczj123.Test3.model.User;
4
5import java.util.List;
6
7/**
8 * Created by wangkai on 2017/7/9.
9 */
10public interface UserMapper {
11
12    User selectById(int id);
13
14    List<User> selectAll();
15
16}

在src/main/resources下新建目录mappers

新建UserMapper.xml

1<?xml version="1.0" encoding="UTF-8" ?>
2<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
3<mapper namespace="com.jczj123.Test3.dao.UserMapper" >
4    <resultMap id="BaseResultMap" type="com.jczj123.Test3.model.User" >
5        <constructor >
6            <idArg column="id" jdbcType="INTEGER" javaType="java.lang.Integer" />
7            <arg column="username" jdbcType="VARCHAR" javaType="java.lang.String" />
8            <arg column="password" jdbcType="VARCHAR" javaType="java.lang.String" />
9        </constructor>
10    </resultMap>
11    <sql id="Base_Column_List" >
12        id, username, password
13    </sql>
14    <select id="selectById" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
15        select
16        <include refid="Base_Column_List" />
17        from user
18        where id = #{id,jdbcType=INTEGER}
19    </select>
20
21    <select id="selectAll" resultMap="BaseResultMap">
22        select
23        <include refid="Base_Column_List" />
24        from user
25    </select>
26
27</mapper>

service包下新建IUserService接口

1package com.jczj123.Test3.service;
2
3import com.jczj123.Test3.model.User;
4
5import java.util.List;
6
7/**
8 * Created by wangkai on 2017/7/9.
9 */
10public interface IUserService {
11
12    User findById(int id);
13
14    List<User> findAll();
15
16}

service包下新建子包impl

新建实现类

UserServiceImpl

1package com.jczj123.Test3.service.impl;
2
3import com.jczj123.Test3.dao.UserMapper;
4import com.jczj123.Test3.model.User;
5import com.jczj123.Test3.service.IUserService;
6import org.springframework.beans.factory.annotation.Autowired;
7import org.springframework.stereotype.Service;
8
9import java.util.List;
10
11/**
12 * Created by wangkai on 2017/7/9.
13 */
14@Service(value = "userService")
15public class UserServiceImpl implements IUserService {
16
17    @Autowired
18    private UserMapper userMapper;
19
20    public User findById(int id) {
21        return userMapper.selectById(id);
22    }
23
24    public List<User> findAll() {
25        return userMapper.selectAll();
26    }
27}

controller下新建一个UserController

1package com.jczj123.Test3.controller;
2
3import com.jczj123.Test3.model.User;
4import com.jczj123.Test3.service.IUserService;
5import org.springframework.beans.factory.annotation.Autowired;
6import org.springframework.stereotype.Controller;
7import org.springframework.ui.ModelMap;
8import org.springframework.web.bind.annotation.RequestMapping;
9
10import java.util.List;
11
12/**
13 * Created by wangkai on 2017/7/9.
14 */
15@Controller
16public class UserController {
17
18    @Autowired
19    private IUserService userService;
20
21    @RequestMapping("/list.do")
22    public String doGet(ModelMap modelMap) {
23        List<User> userList = userService.findAll();
24
25        modelMap.addAttribute("users", userList);
26        return "userList";
27    }
28}

velocity下新建userList.vm文件

1<!DOCTYPE html>
2<html lang="en">
3<head>
4    <meta charset="UTF-8">
5    <title>用户列表</title>
6</head>
7<body>
8    <table border="1">
9        <tr>
10            <th>用户id</th>
11            <th>用户名</th>
12            <th>密码</th>
13        </tr>
14        #foreach($user in $users)
15            <tr>
16                <td>$user.id</td>
17                <td>$user.username</td>
18                <td>$user.password</td>
19            </tr>
20        #end
21    </table>
22</body>
23</html>

启动tomcat服务器，浏览器访问：

http://localhost:8088/list.do

就可以看到：

表示成功了

代码托管在码云上，地址是：

http://git.oschina.net/nicekk/spring-mybatis-simple

欢迎访问