前言

说起整合自然离不开ssm，我本身并不太喜欢ORM,尤其是MyBatis，把SQL语句写在xml里，尤其是大SQL，可读性不高，出错也不容易排查。

开发环境

idea2016、SpringMVC4、Mybatis3

项目结构

SSM整合

1、pom.xml

 1  3   4.0.0 4   com.autohome 5   SpringMVC3 6   war 7   1.0-SNAPSHOT 8   SpringMVC3 9   http://maven.apache.org10   11     12       junit13       junit14       4.1015     16     17       org.springframework18       spring-core19       4.3.6.RELEASE20     21     22       org.springframework23       spring-beans24       4.3.6.RELEASE25     26     27       org.springframework28       spring-context29       4.3.6.RELEASE30     31     32       org.springframework33       spring-web34       4.3.6.RELEASE35     36     37       org.springframework38       spring-context-support39       4.3.6.RELEASE40     41     42       org.springframework43       spring-webmvc44       4.3.6.RELEASE45     46     47       org.springframework48       spring-jdbc49       4.3.6.RELEASE50     51     52       org.apache.velocity53       velocity54       1.6.255     56     57       org.apache.velocity58       velocity-tools59       2.060     61     62       org.mybatis63       mybatis64       3.4.265     66     67       org.mybatis68       mybatis-spring69       1.3.070     71     72       com.microsoft.sqlserver73       sqljdbc474       4.075     76     77       commons-dbcp78       commons-dbcp79       1.480     81   82   83     SpringMVC384   85 

2、web.xml

 1   "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 3  "http://java.sun.com/dtd/web-app_2_3.dtd" > 4  5  6   Archetype Created Web Application 7    8    9     contextConfigLocation10     classpath:applicationContext.xml11   12   13     org.springframework.web.context.ContextLoaderListener14   15   16   17     SpringMVC18     org.springframework.web.servlet.DispatcherServlet19     20       contextConfigLocation21       classpath:springmvc-servlet.xml22     23   24   25     SpringMVC26     /27   28 

3、applicationContext.xml无配置内容所以忽略

4、springmvc-servlet.xml

 1 <?xml version="1.0" encoding="UTF-8"?> 2 13 14     15     16         17         18     19 20     21     22         23         24         25         26     27 28     29     30         31 32     33 34     35     36         37         38     39 40     41     42 43     44     45     46     47 48     49     50         51         52     53 54 

5、springmvc-mybatis.xml

 1 <?xml version="1.0" encoding="UTF-8"?> 2          "http://mybatis.org/dtd/mybatis-3-config.dtd"> 4  5  6      7      8          9     10 11 12     13         14     15 16 

6、dao接口层、mapper(dao接口实现层)、Biz层、 model层忽略不计(id,name,address3个测试字段)。 mapper文件让我踩了坑，后恍然大悟，mapper.xml要放在resources包下。

public interface UserMapper {    List listAllUser();    List listPagedUser(@Param("pageIndex") int pageIndex,@Param("pageSize") int pageSize);    int count();    int updateUser(User user);    int deleteUser(int id);    int insertUser(User user);    User getUserById(int id); } 1 <?xml version="1.0" encoding="UTF-8"?> 2          "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 4  5  6      7         select * from t_userinfo 8      9 10     11         select top ${pageSize} * from t_userinfo where id not in (select top (${pageSize} * (${pageIndex} -1)) id from t_userinfo)12     13 14     15         select count(*) from t_userinfo16     17 18     19         insert into t_userinfo VALUES (#{name},#{address})20     21 22     23         UPDATE  t_userinfo set name=#{name},address=#{address} where id=#{id}24     25 26     27         DELETE FROM t_userinfo where id=#{id}28     29 30     31         select * from t_userinfo where id=#{id}32     33 34 

package com.autohome.service; import com.autohome.model.User;import com.autohome.mapper.UserMapper;import org.apache.ibatis.annotations.Param;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service; import java.util.List;import java.util.Map;  @Servicepublic class UserBizImpl implements IUserBiz {     @Autowired    private UserMapper userMapper;     public List listAllUser() {        return userMapper.listAllUser();    }     public List listPagedUser(@Param("pageIndex") int pageIndex,@Param("pageSize") int pageSize) {        return userMapper.listPagedUser(pageIndex,pageSize);    }     public int count() {        return userMapper.count();    }     public int updateUser(User user) {        return userMapper.updateUser(user);    }     public int deleteUser(int id) {        return userMapper.deleteUser(id);    }     public int insertUser(User user) {        return userMapper.insertUser(user);    }     public User getUserById(int id) {        return userMapper.getUserById(id);    }}7、Controller。 我新建了一个UserController，在这里调用了增删改查分页的操作

package com.autohome.controller; import com.autohome.service.IUserBiz;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.autohome.model.User;  @Controller@RequestMapping("/User")public class UserController {     @Autowired    private IUserBiz userBiz;     @RequestMapping("/index")    public ModelAndView index(){        //System.out.println("size:"+userBiz.listAllUser().size());         System.out.println("size:"+userBiz.count());        User user =new User();//        user.setName("张三");//        user.setAddress("shanxi");        int result = userBiz.insertUser(user);//        if(result>0)//        {//            System.out.println("insert success");//        }else{//            System.out.println("insert err");//        }         int result = userBiz.deleteUser(39);        if(result>0)        {            System.out.println("delete success");        }else{            System.out.println("delete err");        } //        User user =new User();//        user.setId(35);//        user.setName("张三11111");//        user.setAddress("china");        int result = userBiz.updateUser(user);//        if(result>0)//        {//            System.out.println("update success");//        }else{//            System.out.println("update err");//        }          //System.out.println("size:"+userBiz.listPagedUser(1,10).size());           ModelAndView mav=new ModelAndView("index");         return mav;    }}

总结

做这个demo前我看的ssm整合教程全部是基于myeclipse开发的，而且教程把dao接口和dao实现是全部放在src java目录下的，也就是mapper目录包括了mapper接口和mapper.xml。 我做第一个demo时在idea里也是这么做的，demo运行始终不成功，一直提示找不 到mapper.xml里的方法，后来编译的时候我发现target/classes里确实找不到mapper.xml。 不知道用myeclipse整合开发时是否遇到这个问题，后我把mapper.xml文件放到resources目录中，编译后target文件中就能找到mapper.xml。 方法运行也搞定了。写demo写了半个小时，debug这个问题花了2个小时，好在demo跑起来了，也算是有收获的。

博客地址：http://www.cnblogs.com/sword-successful/