SSM框架_2（添加mybatis）

時間  2019-11-12
標籤 ssm 框架 添加 mybatis 欄目 MyBatis 简体版
原文   原文鏈接

Maven搭建SpringMVC+Spring+MyBatis框架，將陸續集成新功能（github地址：https://github.com/jiangcaijun/ssm）html

##2017-01-22(maven + spring + spring MVC + mybatis項目)java

一、配置conf下數據庫鏈接

新建/conf/spring-mybatis.xmlmysql

<?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:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context-3.2.xsd
  http://www.springframework.org/schema/tx
  http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
  http://www.springframework.org/schema/aop
  http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
  http://www.springframework.org/schema/util 
  http://www.springframework.org/schema/util/spring-util-3.2.xsd">

	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
		init-method="init" destroy-method="close">
		<property name="driverClassName">
			<value>${jdbc_driverClassName}</value>
		</property>
		<property name="url">
			<value>${jdbc_url}</value>
		</property>
		<property name="username">
			<value>${jdbc_username}</value>
		</property>
		<property name="password">
			<value>${jdbc_password}</value>
		</property>
		<!-- 鏈接池最大使用鏈接數 -->
		<property name="maxActive">
			<value>20</value>
		</property>
		<!-- 初始化鏈接大小 -->
		<property name="initialSize">
			<value>1</value>
		</property>
		<!-- 獲取鏈接最大等待時間 -->
		<property name="maxWait">
			<value>60000</value>
		</property>
		<!-- 鏈接池最大空閒 -->
		<property name="maxIdle">
			<value>20</value>
		</property>
		<!-- 鏈接池最小空閒 -->
		<property name="minIdle">
			<value>3</value>
		</property>
		<!-- 自動清除無用鏈接 -->
		<property name="removeAbandoned">
			<value>true</value>
		</property>
		<!-- 清除無用鏈接的等待時間 -->
		<property name="removeAbandonedTimeout">
			<value>180</value>
		</property>
		<!-- 鏈接屬性 -->
		<property name="filters" value="config,wall,stat" />
		<property name="connectionProperties">
			<value>config.decrypt=true</value>
		</property>
	</bean>

	<!-- mybatis文件配置，掃描全部mapper文件 -->
	<!-- p:configLocation加載mybatis的配置文件 -->
	<!-- p:mapperLocations自動掃描model目錄中的映射xml文件，省去了在config中手工配置 -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"
		p:dataSource-ref="dataSource" 
		p:configLocation="classpath:conf/mybatis-config.xml"
		p:mapperLocations="classpath:cn/springmvc/mapper/*.xml" /><!-- configLocation爲mybatis屬性mapperLocations爲全部mapper -->

	<!-- spring與mybatis整合配置，掃描全部dao -->
	<!-- 對Dao 接口動態實現，須要知道接口在哪  -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"
		p:basePackage="cn.springmvc.dao" p:sqlSessionFactoryBeanName="sqlSessionFactory" />

	<!-- 對數據源進行事務管理 -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  
		<property name="dataSource" ref="dataSource" />
	</bean> 

	<tx:advice id="transactionAdvice"  transaction-manager="transactionManager"> 
	<tx:attributes>  
		<tx:method name="save*" propagation="REQUIRED" /> 
		<tx:method name="update*" propagation="REQUIRED" /> 
		<tx:method name="delete*" propagation="REQUIRED" /> 
		<tx:method name="insert*" propagation="REQUIRED" /> 
		<tx:method name="load*" propagation="SUPPORTS" /> 
		<tx:method name="find*" propagation="SUPPORTS" /> 
		<tx:method name="list*" propagation="SUPPORTS" /> 
		<tx:method name="check*" propagation="SUPPORTS" />   
		<tx:method name="*" propagation="SUPPORTS" /> 
	</tx:attributes>
	</tx:advice> 

	<aop:config>  
		<aop:pointcut id="transactionPointcut" expression="execution(* com.ssm.service.*.*(..))" />
		<aop:advisor pointcut-ref="transactionPointcut" advice-ref="transactionAdvice" /> 
	</aop:config>
</beans>

二、 配置spring相關配置文件

/conf/spring.xml (實現spring配置文件的掃描)git

<?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.xsd">

	<!-- 引入jdbc配置文件 -->
	<context:property-placeholder location="classpath:jdbc.properties" />

	<!-- 掃描文件（自動將servicec層注入） -->
	<context:component-scan base-package="com.ssm.service" />
</beans>

三、 配置jdbc屬性文件

jdbc.properties(配置與數據庫的鏈接屬性，此處數據庫的密碼爲明文存在，後續將對其進行加密處理)github

jdbc_driverClassName=com.mysql.jdbc.Driver
jdbc_url=jdbc:mysql://localhost:3306/ssm_20170114?useUnicode=true&characterEncoding=utf-8
jdbc_username=root
jdbc_password=admin

四、 src/main/java下java代碼

4.一、Mybatis-Generator

注意能夠利用Mybatis-Generator來生成Dao、Model、Mapping相關文件，以此減小工做量。 可參考連接：使用Mybatis-Generator自動生成Dao、Model、Mapping相關文件 - 李晨瑋 - 博客園（http://www.cnblogs.com/lichenwei/p/4145696.html）web

4.二、新建user表(對應user_t)

DROP TABLE IF EXISTS `user_t`;
CREATE TABLE `user_t` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_name` varchar(40) NOT NULL,
  `password` varchar(255) NOT NULL,
  `age` int(4) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;

4.三、model層新建User.java ( 用戶表，對應用戶的基本信息)

package com.ssm.model;
/**
* @Description: 用戶表
* @author jiangcaijun
* @date 2017年01月20日 下午6:37:51
*/
public class User {
  private Integer id;

  private String userName;

  private String password;

  private Integer age;

  public Integer getId() {
      return id;
  }

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

  public String getUserName() {
      return userName;
  }

  public void setUserName(String userName) {
      this.userName = userName == null ? null : userName.trim();
  }

  public String getPassword() {
      return password;
  }

  public void setPassword(String password) {
      this.password = password == null ? null : password.trim();
  }

  public Integer getAge() {
      return age;
  }

  public void setAge(Integer age) {
      this.age = age;
  }
}

4.四、dao層新建UserMapper.java

package com.ssm.dao;

import com.ssm.model.User;

public interface UserMapper {
    int deleteByPrimaryKey(Integer id);
    int insert(User record);
    int insertSelective(User record);
    User selectByPrimaryKey(Integer id);
    int updateByPrimaryKeySelective(User record);
    int updateByPrimaryKey(User record);
}

4.四、mapper類新建UserMapper.xml ( mybatis方法)

<?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.ssm.dao.UserMapper">
<!-- 這裏用User而不是com.ssm.model.User(用它也是能夠的)，是spring-mybatis別名 -->
  <resultMap id="BaseResultMap" type="User">
    <id column="id" jdbcType="INTEGER" property="id" />
    <result column="user_name" jdbcType="VARCHAR" property="userName" />
    <result column="password" jdbcType="VARCHAR" property="password" />
    <result column="age" jdbcType="INTEGER" property="age" />
  </resultMap>
  <sql id="Base_Column_List">
    id, user_name, password, age
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from user_t
    where id = #{id,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from user_t
    where id = #{id,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.ssm.model.User">
    insert into user_t (id, user_name, password, 
      age)
    values (#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
      #{age,jdbcType=INTEGER})
  </insert>
  <insert id="insertSelective" parameterType="com.ssm.model.User">
    insert into user_t
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="id != null">
        id,
      </if>
      <if test="userName != null">
        user_name,
      </if>
      <if test="password != null">
        password,
      </if>
      <if test="age != null">
        age,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="id != null">
        #{id,jdbcType=INTEGER},
      </if>
      <if test="userName != null">
        #{userName,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        #{password,jdbcType=VARCHAR},
      </if>
      <if test="age != null">
        #{age,jdbcType=INTEGER},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.ssm.model.User">
    update user_t
    <set>
      <if test="userName != null">
        user_name = #{userName,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        password = #{password,jdbcType=VARCHAR},
      </if>
      <if test="age != null">
        age = #{age,jdbcType=INTEGER},
      </if>
    </set>
    where id = #{id,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.ssm.model.User">
    update user_t
    set user_name = #{userName,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      age = #{age,jdbcType=INTEGER}
    where id = #{id,jdbcType=INTEGER}
  </update>
</mapper>

五、src/main/java下java代碼

5.1 service層新建UserService.java (接口)

package com.ssm.service;

import com.ssm.model.User;

public interface UserService {
	public int insert(User user);

	/**
	* @Description: 根據id獲取user
	* @param @param id
	* @param @return    參數
	* @return User    返回類型
	*/
	public User getUser(int id);
}

5.2 service.impl層新建UserServiceImpl.java (UserService.java接口的實現)

package com.ssm.service.impl;

import com.ssm.dao.UserMapper;
import com.ssm.model.User;
import com.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


@Service(value="userService")
public class UserServiceImpl implements UserService {

	@Autowired
	private UserMapper usermapper;
	
	@Override
	public int insert(User user) {
		return usermapper.insert(user);
	}

	@Override
	public User getUser(int id) {
		return usermapper.selectByPrimaryKey(id);
	}
}

5.3 Controller層

新建UserController.java
package com.ssm.controller;

import javax.annotation.Resource;

import com.ssm.model.User;
import com.ssm.service.UserService;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.alibaba.fastjson.JSONObject;

@Controller
@RequestMapping("/user")
public class UserController {
    private static final Logger LOG = Logger.getLogger(UserController.class);
    
    @Autowired
    private UserService userService;
    
    /**
     * 用戶頁
     *
     * @return
     */
    @RequestMapping(value = "/user", method = RequestMethod.GET)
    public String userManager(Model model) {
        int id = 1;
        User user = userService.getUser(id);
        model.addAttribute("user", user);
        LOG.info(user.toString());
        return "user/showUser";
    }
}

此處，也能夠採用 @Resource ,用@Resource後就沒必要使用@Autowired。以下：ajax

@Resource(name="userService")
private UserService userService;

最好是將@Resource放在setter方法上，由於這樣更符合面向對象的思想，經過set、get去操做屬性，而不是直接去操做屬性。以下：spring

@Resource(name="userService")
public void UserService(UserService userService) {
	this.userService = userService;
}

在userController中添加以下兩個方法：sql

testAjax是模擬ajax請求，testPOJO是直接將POJO類轉爲json數據庫

/**
* @Title: testAjax
* @Description: post請求（測試用）
* @param @param model
* @param @return    參數
* @return String    返回類型
* @throws
*/
@RequestMapping(value = "/testAjax", method = RequestMethod.POST)
@ResponseBody
public String testAjax(Model model) {
	JSONObject jsonObject = new JSONObject();
	jsonObject.put("id","數據拿到了");
	
	return jsonObject.toString();
}
/**
* @Title: testPOJO
* @Description: 
* @param @param model
* @param @return    參數
* @return String    返回類型
* @throws
*/
@RequestMapping(value = "/testPOJO", method = RequestMethod.POST)
@ResponseBody
public User testPOJO(Model model) {
    int id = 1;
    User user = userService.getUser(id);  
    return user;
}

此時， http://localhost:8080/ssm_20170114/user/user 便可正常訪問了。框架結構以下（IDE由Eclipse轉爲idea）：

maven + spring + spring MVC + mybatis項目項目結構圖

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