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
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.autohome</groupId> <artifactId>SpringMVC3</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>SpringMVC3</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.10</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.3.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.3.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.3.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.3.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>4.3.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.6.RELEASE</version> </dependency> <dependency> <groupId>org.apache.velocity</groupId> <artifactId>velocity</artifactId> <version>1.6.2</version> </dependency> <dependency> <groupId>org.apache.velocity</groupId> <artifactId>velocity-tools</artifactId> <version>2.0</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.2</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.0</version> </dependency> <dependency> <groupId>com.microsoft.sqlserver</groupId> <artifactId>sqljdbc4</artifactId> <version>4.0</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> </dependencies> <build> <finalName>SpringMVC3</finalName> </build> </project>
2、web.xml
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Archetype Created Web Application</display-name> <!--告知javaEE容器，有那些内容需要添加到上下文里去--> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!--spring 前端控制器--> <servlet> <servlet-name>SpringMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-servlet.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>SpringMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
3、applicationContext.xml无配置内容所以忽略
4、springmvc-servlet.xml
<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
<!--从配置文件加载数据库信息-->
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations" value="classpath:config/jdbc.properties"/>
<property name="fileEncoding" value="UTF-8"/>
</bean>
<!--配置数据源，这里使用Spring默认-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${sqlserver.driver}"/>
<property name="url" value="${sqlserver.url}"/>
<property name="username" value="${sqlserver.username}"/>
<property name="password" value="${sqlserver.password}"/>
</bean>
<!--扫描Mapper-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.autohome.mapper"/>
</bean>
<!--配置sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:springmvc-mybatis.xml"/>
<property name="dataSource" ref="dataSource"/>
</bean>
<!--启用最新的注解器、映射器-->
<mvc:annotation-driven/>
<!--扫描Controller注解类-->
<context:component-scan base-package="com.autohome.controller" />
<!--扫描Service注解类-->
<context:component-scan base-package="com.autohome.service"/>
<!--配置视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
5、springmvc-mybatis.xml
<?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> <!-- 实体类,简称 -设置别名 --> <typeAliases> <typeAlias alias="User" type="com.autohome.model.User" /> </typeAliases> <mappers> <mapper resource="mapper/UserMapper.xml" /> </mappers> </configuration>
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<User> listAllUser();
List<User> 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);
}
<?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">
<!--命名空间和接口保持一致-->
<mapper namespace="com.autohome.mapper.UserMapper">
<select id="listAllUser" resultType="User">
select * from t_userinfo
</select>
<select id="listPagedUser" resultType="User">
select top ${pageSize} * from t_userinfo where id not in (select top (${pageSize} * (${pageIndex} -1)) id from t_userinfo)
</select>
<select id="count" resultType="int">
select count(*) from t_userinfo
</select>
<insert id="insertUser" parameterType="User">
insert into t_userinfo VALUES (#{name},#{address})
</insert>
<update id="updateUser" parameterType="User">
UPDATE t_userinfo set name=#{name},address=#{address} where id=#{id}
</update>
<delete id="deleteUser" parameterType="int">
DELETE FROM t_userinfo where id=#{id}
</delete>
<select id="getUserById" resultType="User" parameterType="int">
select * from t_userinfo where id=#{id}
</select>
</mapper>
public interface IUserBiz {
List<User> listAllUser();
List<User> 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);
}
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;
@Service
public class UserBizImpl implements IUserBiz {
@Autowired
private UserMapper userMapper;
public List<User> listAllUser() {
return userMapper.listAllUser();
}
public List<User> 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文件总就能找到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。
好了，以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对亿速云的支持。
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