SSM整合实例 | 易学教程

一、思路

SSH --> Spring+SpringMVC+MyBatis

SM整合 --> SS整合 -->SSM

二、大体框架

三、Spring整合MyBatis

SqlSessionFactory ->SqlSession -> StudentMapper ->CRUD

MyBatis最终通过SqlSessionFactory 来操作数据库，Spring整合MyBatis，其实就是将MyBatis的SqlSessionFactory交给Spring。

1、jar包

2、配置

与spring整合时，mybatis的配置文件conf.xml（数据源+mapper.xml）可省，将其配置在applicationContext.xml中。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	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">

	<bean id="config" class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
		<property name="locations">
			<array>
				<value>classpath:db.properties</value>
			</array>
		</property>
	</bean>

	<!-- 配置数据库信息（替代mybatis的配置文件confx.ml）   -->
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
		<property name="driverClassName" value="${driver}"></property>
		<property name="url" value="${url}"></property>
		<property name="username" value="${username}"></property>
		<property name="password" value="${password}"></property>
	</bean> 
	
	<!-- 在springIOC中创建mybatis的核心类SqlSessionFactoryBean  -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource"></property>
		<property name="mapperLocations" value="classpath:com/guor/mapper/*.xml"></property>
	</bean> 

	<bean id="studentService" class="com.guor.service.impl.StudentServiceImpl">
		<property name="studentMapper" ref="studentMapper"></property>
	</bean>
	
	<!-- 批量产生mapper对象在IOC中的id值默认就是接口名-->
	<bean id="mappers" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>  
		<!-- 指定批量产生哪个包的mapper对象 -->
		<property name="basePackage" value="com.guor.mapper"></property>  
	</bean>
</beans>

driver=oracle.jdbc.OracleDriver
url=jdbc:oracle:thin:@127.0.0.1:1521:ORCL
username=orcl
password=orcl

3、编写代码

（1）entity

package com.guor.entity;

public class Student {
	private int id;
	private String name;
	private int age;

	...
}

（2）mapper

package com.guor.mapper;

import com.guor.entity.Student;

public interface StudentMapper {
	public void addStudent(Student student);

	public Student queryStudentByStuNo(int id);
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.guor.mapper.StudentMapper">
	<select id="queryStudentByStuNo" parameterType="int" resultType="com.guor.entity.Student">
		select * from student where id = #{stuNo}
	</select>
	
	<insert id="addStudent" parameterType="com.guor.entity.Student">
		insert into student(id,name,age) values (#{id},#{name},#{age})
	</insert>
</mapper>

（3）service（面向接口编程）

package com.guor.service;

import com.guor.entity.Student;

public interface IStudentService {
	public void addStudent(Student student);
	public Student queryStudentByStuNo(int id);
}

package com.guor.service.impl;

import com.guor.entity.Student;
import com.guor.mapper.StudentMapper;
import com.guor.service.IStudentService;

public class StudentServiceImpl implements IStudentService {
	private StudentMapper studentMapper;
	
	public void setStudentMapper(StudentMapper studentMapper) {
		this.studentMapper = studentMapper;
	}

	@Override
	public void addStudent(Student student) {
		studentMapper.addStudent(student);
	}

	@Override
	public Student queryStudentByStuNo(int id) {
		return studentMapper.queryStudentByStuNo(id);
	}
}

（4）controller

package com.guor.controller;

import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import com.guor.entity.Student;
import com.guor.service.IStudentService;

@Controller
@RequestMapping("studentController")
public class StudentController {
	@Autowired
	@Qualifier("studentService")
	private IStudentService studentService;

	public void setStudentService(IStudentService studentService) {
		this.studentService = studentService;
	}

	@RequestMapping("queryStudentByStuNo/{id}")//映射
	public String queryStudentByStuNo(@PathVariable("id") Integer id,Map<String,Object> map) {
		Student student = studentService.queryStudentByStuNo(id);
		map.put("student", student);
		return "result";
	}
}

四、Spring整合SpringMVC

1、jar包

一个就行，spring-webmvc-4.3.9.RELEASE.jar

2、配置

<?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" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.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">
	
	<!-- 扫描有注解的包 -->
	<context:component-scan base-package="com.guor.controller"></context:component-scan>
	
	<!-- 配置视图解析器(InternalResourceViewResolver) -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/views/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
	<!-- springMVC基础配置、标配 -->
	<mvc:annotation-driven></mvc:annotation-driven>
	
	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
		<property name="messageConverters">
			<list>
				<ref bean="mappingJacksonHttpMessageConverter" />
			</list>
		</property>
	</bean>
	<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
		<property name="supportedMediaTypes">
			<list>
				<value>text/html;charset=UTF-8</value>
			</list>
		</property>
	</bean>
	
	<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
		<!-- <property name="exceptionAttribute" value = "ex"></property> 异常变量的默认值是exception-->
		<property name="exceptionMappings">
			<props>
				<!-- 相当于catch -->
				<prop key="java.lang.ArithmeticException">
					error
				</prop>
				<prop key="java.lang.NullPointException">
					error
				</prop>
			</props>
		</property>
	</bean>
</beans>

3、index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<a href="studentController/queryStudentByStuNo/3">queryStudentByStuNo</a>
</body>
</html>

4、运行

来源：oschina

链接：https://my.oschina.net/u/4006148/blog/3303535

标签

Spring

MyBatis

java

entity