SSM集成

导包

 

数据源配置文件（jdbc.properties）

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///mybatis
jdbc.username=root
jdbc.password=123456

Spring配置文件（applicationContext.xml）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:tx="http://www.springframework.org/schema/tx"
           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.xsd
                              http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
                              http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
">
    <!--1.jdbc-properties 2.dataSource 3.SqlSessionFactory 4.mapper映射器-->
    <!--扫描service层-->
    <context:component-scan base-package="cn.itsource.ssm.service"/>
    <!--引入jdbc.properties配置文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!--配置数据源，连接池-->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>
    <!--配置SQLSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--引入数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--为domain取别名-->
        <property name="typeAliasesPackage" value="cn.itsource.ssm.domain,cn.itsource.ssm.query"/>
        <!--找我们的映射文件-->
        <property name="mapperLocations" value="classpath:cn/itsource/ssm/mapper/*.xml"/>
    </bean>
    <!--配置注入映射器-->
    <!--一劳永益的方法-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.itsource.ssm.mapper"/>
    </bean>
    <!--配置事务-->
    <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--注解支持-->
    <tx:annotation-driven/>
</beans>
springmvc配置文件（ApplicationContext-mvc.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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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
">

    <!--扫描controller层-->
    <context:component-scan base-package="cn.itsource.ssm.web.controller"/>
    <!--静态资源放行-->
    <mvc:default-servlet-handler/>
    <!--支持注解-->
    <mvc:annotation-driven/>

    <!--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>

WEB.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!--核心控制器-->
    <servlet>
        <servlet-name>dispatchServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--读取SpringMVC的配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:ApplicationContext-mvc.xml</param-value>
        </init-param>
        <!--Tomcat启动就启动-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatchServlet</servlet-name>
        <!--符合RESTful风格-->
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--Spring监听器(读取核心文件)-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:ApplicationContext.xml</param-value>
    </context-param>

    <!--POST请求的中文编码过滤器-->
    <!-- 字符集 过滤器  -->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

项目结构图

注意在创建resources文件夹下面创建文件夹时不能用cn.itsource.ssm.mapper,要用cn/itsource/ssm/mapper

 例子

domain（Employee）

package cn.itsource.ssm.domain;

public class Employee {
    private Long id;
    private String name;
    private Integer age;
    private Boolean sex;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

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

    public Boolean getSex() {
        return sex;
    }

    public void setSex(Boolean sex) {
        this.sex = sex;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", sex=" + sex +
                '}';
    }
}

mapper(EmployeeMapper)

package cn.itsource.ssm.mapper;

import cn.itsource.ssm.domain.Employee;

import java.util.List;

public interface EmployeeMapper {

    List<Employee> findAll();
    Employee findOne(Long id);

    void save(Employee employee);
    void delete(Long id);
    void update(Employee employee);
}

service(EmployeeSeviceImpl)

package cn.itsource.ssm.service.impl;

import cn.itsource.ssm.domain.Employee;
import cn.itsource.ssm.mapper.EmployeeMapper;
import cn.itsource.ssm.service.IEmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class EmployeeServiceImpl implements IEmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;
    @Override
    public List<Employee> findAll() {
        return employeeMapper.findAll();
    }

    @Override
    public Employee findOne(Long id) {
        return employeeMapper.findOne(id);
    }

    @Override
    public void save(Employee employee) {
        employeeMapper.save(employee);
    }

    @Override
    public void delete(Long id) {
        employeeMapper.delete(id);
    }

    @Override
    public void update(Employee employee) {
        employeeMapper.update(employee);
    }
}

controller(EmployeeController)

package cn.itsource.ssm.web.controller;

import cn.itsource.ssm.domain.Employee;
import cn.itsource.ssm.service.IEmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

@Controller
@RequestMapping("/employee")
public class EmployeeController {

    @Autowired
    private IEmployeeService employeeService;

    @RequestMapping("index")
    public String index(){
        return "employee";
    }

    @RequestMapping("/list")
    @ResponseBody
    public List<Employee> findAll(){
        List<Employee> list = employeeService.findAll();
        return list;
    }
}
映射文件（EmployeeMapper.xml）

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--
   这个Mapper的主要功能就是写sql
   mapper:根
   namespace:命令空间 (用来确定唯一) 以前这个是可以不加的,现在必需加
     namespace的值，规则的：映射文件XxxMapper.xml所在的包+domain类名+Mapper
 -->
<mapper namespace="cn.itsource.ssm.mapper.EmployeeMapper">
    <select id="findAll" resultType="employee">
        select * from employee
    </select>
</mapper>