java SSM框架整合实战

这次的ssm整合比较详细，会从单独的mybatis连接数据库开始，基本会分为以下几个步骤：

1.单独使用mybatis

2.Mybatis整合spring - 有Mapper实现类

3.Mybatis整合spring – 没有Mapper实现类

4.Mybatis整合spring – mapper接口扫描

5.Mybatis 整合spring – 整合jdbc事务

6.整合springmvc

首先，对ssm整合有个大体的认识：

表现层：SpringMVC

包：SpringMVC的jar
配置文件：spring-mvc.xml

业务层：Spring

包：spring-ioc Spring-aop Spring-tx Spring-test
配置文件：applicationContext.xml
添加关于mybatis的配置

持久层：mybatis

包：mybatis自身核心包 Mysql数据库驱动包 C3p0连接池 Mybatis-spring的包
配置文件：sqlMapConfig.xml userMapperxml

一、单独使用mybatis

1.导入必须的包：
a)Mybatis自身核心jar：mybatis-3.4.4.jar
b)Log4j日志jar:log4j-1.2.17.jar
c)Oracle驱动jar：odbc14-10.2.0.4.0.jar
maven添加依赖jar包

        
            org.mybatis
            mybatis
            3.4.4
        
        
            log4j
            log4j
            1.2.17
        
        
            com.oracle
            ojdbc14
            10.2.0.4.0

注意：ojdbc因为版权关系在maven远程仓库中只有目录没有jar包的，如果添加配置报错要手动下载相应jar包放在本地仓库的相应文件夹就好啦。

2.建立测试数据库表

create table da_user
(
user_id NUMBER,
user_name VARCHAR2(10),
sex Integer,
JOB VARCHAR2(64),
tel varchar2(32),
email varchar2(64),
hobby varchar2(64)
);

3.建立实体类
也可以直接用HashMap映射对于比较简单的查询我比较习惯用这个
4.建立mapper接口UserMapper:

package com.ways.app.dao;

import java.util.Map;

public interface UserMapper {

    public void saveUser(Map paramsMap); 
}

5.建立sql映射文件userMapper.xml




    
        insert into da_user 
        values (decode((select max(user_id) from da_user),null,1,(select max(user_id) + 1 from da_user)),
                ‘${userName}’,${sex},'${job}','${tel}','${email}','${hobby}')

6.建立sqlMapConfig.xml

7.编写测试类

package ssmTest;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.ways.app.dao.UserMapper;

public class MybatisTest {
    @Test
    public void test() throws IOException {
        //1.创建SqlSessionFactoryBuilder
        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
        // 加载sqlMapConfig.xml文件
        InputStream ins = Resources.getResourceAsStream("sqlMapConfig.xml");
        
        
        //2.创建SqlSessionFactory
        SqlSessionFactory factory = builder.build(ins);
        
        //3.打开SqlSession
        SqlSession sqlSession = factory.openSession();
        
        //4.获取mapper接口的对象
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        
        //操作
        Map paramsMap = new HashMap();
        paramsMap.put("userName", "zhaohy");
        paramsMap.put("sex", 1);
        paramsMap.put("job", "java软件工程师");
        paramsMap.put("tel", "189xxxx0598");
        paramsMap.put("email", "[email protected]");
        paramsMap.put("hobby", "编程，运动");
        userMapper.saveUser(paramsMap);
        //6.提交事务
        sqlSession.commit();
        
        //7.关闭资源
        sqlSession.close();
    }
}

运行测试类插入成功

深度截图_选择区域_20190721113023.png

补充：maven pom.xml


    4.0.0
    com.ways
    ssmTest
    0.0.1-SNAPSHOT
    war
    
        
            junit
            junit
            4.12
            test
        
        
            org.apache.maven.plugins
            maven-compiler-plugin
            3.8.1
            provided
        
        
            org.apache.tomcat
            tomcat-servlet-api
            7.0.94
            provided
        
        
            org.apache.tomcat
            tomcat-jsp-api
            7.0.94
            provided
        
        
            org.ow2.asm
            asm
            7.1
            provided
        
        
            org.mybatis
            mybatis
            3.4.4
        
        
            log4j
            log4j
            1.2.17
        
        
            com.oracle
            ojdbc14
            10.2.0.4.0
        
    
    
    
    
    
        
            
                org.apache.maven.plugins
                maven-compiler-plugin
                3.8.1
                
                    1.7
                    1.7
                     
                      src\main\webapp\WEB-INF\lib
                      /home/zhaohy/software/jdk1.8.0_181/jre/lib/rt.jar
                     
                
            
            
              org.apache.tomcat.maven
              tomcat7-maven-plugin
              2.2
              
                8080
                /
              
            
            
                org.apache.maven.plugins
                maven-war-plugin
                2.6
                
            
            
                org.apache.maven.plugins
                maven-jar-plugin
                3.0.2
            
        
        
       
            
                src/main/java
                
                    **/*.properties
                    **/*.xml
                
                false
            
            
                src/main/resources
                
                    **/*.properties
                    **/*.xml
                
                false
            
        
    
    
    
       UTF-8 
       UTF-8

web.xml



  ssmTest

项目源码已上传github地址:
https://github.com/haiyong6/haiyongsRepository/tree/master/code/ssmTest

二、Mybatis整合spring - 有Mapper实现类

1.在上面的基础上导入必须的包：
Mybatis-spring
Spring自身的包：
spring-ioc
spring-aop
spring-tx
spring-context
c3p0数据库连接池的包
maven 配置：

        
            org.mybatis
            mybatis-spring
            2.0.2
        
        
        
            com.mchange
            c3p0
            0.9.5.4
        
        
        
            org.springframework
            spring-test
            5.1.8.RELEASE
            test
        
        
            org.springframework
            spring-aop
            5.1.8.RELEASE
        
 
        
            org.springframework
            spring-context
            5.1.8.RELEASE
        
        
            org.springframework
            spring-jdbc
            5.1.8.RELEASE
        
        
            org.springframework
            spring-tx
            5.1.8.RELEASE

2.编写Mapper的实现类：

package com.ways.app.dao.impl;

import java.util.Map;

import org.mybatis.spring.support.SqlSessionDaoSupport;

import com.ways.app.dao.UserMapper;

public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper {

    @Override
    public void saveUser(Map paramsMap) {
        this.getSqlSession().insert("com.ways.app.dao.UserMapper.saveUser", paramsMap);
        //不需要事务提交 mybatis帮忙提交了
    }

}

3.编写applicationContext.xml:

jdbc.properties文件：

jdbc.driverClassName=oracle.jdbc.OracleDriver
jdbc.url=jdbc\:oracle\:thin\:@127.0.0.1\:1521\:xe
jdbc.username=zhaohy
jdbc.password=oracle

修改sqlMapConfig.xml:

4.编写测试类MybatisSpringTest：

package ssmTest;

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

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ways.app.dao.UserMapper;

public class MybatisSpringTest {
 
    @SuppressWarnings("resource")
    @Test
    public void test() {
        //1.加载spring配置
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        //2.获取对象
        UserMapper commonMapper = (UserMapper) ac.getBean("userMapper");
        //3.调用方法
        Map paramsMap = new HashMap();
        paramsMap.put("userName", "zhaohy1");
        paramsMap.put("sex", 1);
        paramsMap.put("job", "java软件工程师");
        paramsMap.put("tel", "189xxxx0598");
        paramsMap.put("email", "[email protected]");
        paramsMap.put("hobby", "编程，运动");
        commonMapper.saveUser(paramsMap);
    }
}

运行可以看到第二条已经插入成功！

深度截图_选择区域_20190721121353.png

项目源码已上传github:
https://github.com/haiyong6/haiyongsRepository/tree/master/code/ssmTest01

三、Mybatis整合spring - 没有Mapper

修改applicationContext.xml

项目源码已上传github地址：
https://github.com/haiyong6/haiyongsRepository/tree/master/code/ssmTest02

四、Mybatis整合spring – mapper接口

配置扫描修改applicationContext.xml

项目源码已上传github地址：
https://github.com/haiyong6/haiyongsRepository/tree/master/code/ssmTest03

五、Mybatis 整合spring – 整合jdbc事务

1.修改applicationContext.xml

2.编写业务接口和实现方法，并在业务方法上添加注解@Transactional
UserService

package com.ways.app.service;

import java.util.Map;

public interface UserService {
    public void saveUser(Map paramsMap);
}

UserServiceImpl

package com.ways.app.service.impl;

import java.util.Map;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.ways.app.dao.UserMapper;
import com.ways.app.service.UserService;

@Service("userService")
@Transactional
public class UserServiceImpl implements UserService {
    //注入Mapper对象
    @Resource
    private UserMapper userMapper;
    @Override
    public void saveUser(Map paramsMap) {
        userMapper.saveUser(paramsMap);
        int i = 100/0;
        userMapper.saveUser(paramsMap);

    }

}

此处故意写了一个int i = 100/0的异常，为了测试事务是否生效，如果生效的话这两次插入都不会被插入数据库

3.测试方法：

package ssmTest;

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

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ways.app.service.UserService;

public class MybatisSpringTest {
 
    @Test
    public void test1() {
          //1.加载spring配置
            ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
            //2.获取对象
            UserService commonService = (UserService) ac.getBean("userService");
            Map paramsMap = new HashMap();
            paramsMap.put("userName", "zhaohy4");
            paramsMap.put("sex", 1);
            paramsMap.put("job", "java软件工程师");
            paramsMap.put("tel", "189xxxx0598");
            paramsMap.put("email", "[email protected]");
            paramsMap.put("hobby", "编程，运动");
            commonService.saveUser(paramsMap);
        }
}

运行测试方法 junit报错，分母不能为0，通过数据库查表得知两条都没有插入成功，说明事务控制成功。事务注解可以对一个单一的方法也可以对整个类控制。

项目源码已上传github:
https://github.com/haiyong6/haiyongsRepository/tree/master/code/ssmTest04

六、整合SpringMVC

1.导入springMVC的包
2.配置web.xml
1)启动spring,加载applicationContext.xml
2)启动springmvc,加载spring-mvc.xml

maven配置：

        
            org.springframework
            spring-webmvc
            5.1.8.RELEASE
        
        
            com.alibaba
            fastjson
            1.2.58
        
        
            commons-fileupload
            commons-fileupload
            1.4
        
        
            commons-io
            commons-io
            2.6

web.xml:



  ssmTest05
  
  
  
    org.springframework.web.context.ContextLoaderListener
  
  
  
  
    contextConfigLocation
    classPath:applicationContext.xml
  
  
  
  
    DispatcherServlet
    org.springframework.web.servlet.DispatcherServlet
    
    
        contextConfigLocation
        classPath:spring-mvc.xml
    
  
  
    DispatcherServlet
    *.do
  


  
    CharacterEncodingFilter
    org.springframework.web.filter.CharacterEncodingFilter
    
        encoding
        utf-8
    
  
  
    CharacterEncodingFilter
    /*

配置spring-mvc.xml:

编写UserController:

package com.ways.app.web.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class UserController {
    
    @RequestMapping("/user/test")
    public String test() {
        
        return "test";
    }

}

在WEB-INF/pages/下编写test.jsp


<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>




Insert title here


    Hello SpringMVC!

请求/user/test.do接口，成功跳转到test.jsp,springmvc配置成功！

深度截图_选择区域_20190721163515.png

在controller写一个保存用户的方法测试一下能不能插入数据：

package com.ways.app.web.controller;

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

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.ways.app.service.UserService;
@Controller
public class UserController {
    @Resource
    public UserService userService;
    @RequestMapping("/user/test")
    public String test() {
        
        return "test";
    }
    
    @RequestMapping("/user/saveUser")
    public void saveUser() {
        
        Map paramsMap = new HashMap();
        paramsMap.put("userName", "zhaohy4");
        paramsMap.put("sex", 1);
        paramsMap.put("job", "java软件工程师");
        paramsMap.put("tel", "189xxxx0598");
        paramsMap.put("email", "[email protected]");
        paramsMap.put("hobby", "编程，运动");
        userService.saveUser(paramsMap);
    }

}

运行tomcat 请求/user/saveUser.do
可以看到数据库里已经插入了一条信息

深度截图_选择区域_20190721164339.png

至此，一个完整的简单ssm项目就已经搭建完成啦～

项目源码已上传github:
https://github.com/haiyong6/haiyongsRepository/tree/master/code/ssmTest05