B041-SSM集成_拦截器

SSM整合简介

SpringMVC本身是Spring的组件，Spring整合Mybatis即把Mybatis框架的核心类交给Spring管理（IOC）
如Mybatis的SqlsessionFactory、Sqlsession和核心配置文件(四大金刚)

整合步骤

新建dynamic web project，修改默认输出的class路径，修改content directory名，勾选生成web.xml
部署Tomcat
导包：Spring、Spring测试、Servlet和jsp、数据库、Mybatis、Spring和Mybatis的整合包

先准备spring环境

核心配置文件

resources下创建核心配置文件applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc" 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/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
">

	
	<bean id="date" class="java.util.Date">bean>

beans>

测试能否正常使用核心配置文件中的bean

@ContextConfiguration("classpath:applicationContext.xml") // 加载核心配置文件
@RunWith(SpringJUnit4ClassRunner.class)// 使用spring的测试
public class SpringTest{

	@Autowired
	private Date date;
	
	@Test
	public void testName() throws Exception {
		System.out.println(date);
	}
}

Spring整合Mybatis

准备数据库和表

数据库1112下创建dept表

Spring管理数据库连接属性文件

准备属性文件，并交给Spring管理 - （原来是放在mybatis-config中然后由Resources读取）
db.properties

db.username=root
db.password=root
db.url=jdbc:mysql:///1112
db.dirverClassName=com.mysql.jdbc.Driver

applicationContext.xml

	
	<context:property-placeholder location="classpath:db.properties"
		system-properties-mode="NEVER" />

Spring管理连接池

通过连接池获取DataSource数据源

applicationContext.xml

	
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
		<property name="username" value="${db.username}">property>
		<property name="password" value="${db.password}">property>
		<property name="url" value="${db.url}">property>
		<property name="driverClassName" value="${db.dirverClassName}">property>
	bean>

测试：SpringTest

	@Autowired
	private BasicDataSource dataSource;

	@Test
	public void testName() throws Exception {
		System.out.println(dataSource.getConnection());
	}

实体类、mapper接口和映射文件

domain下新建Emp
代码略

mapper包下新建接口和映射文件
EmpMapper

public interface EmpMapper {

	/**
	 * 查询所有
	*/
	List<Emp> findAll();
}

EmpMapper.xml

DOCTYPE mapper
 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 
<mapper namespace="cn.ming.mapper.EmpMapper">
	<select id="findAll" resultType="cn.ming.domain.Emp">
		select *from emp
	select>
mapper>

Spring管理SqlSessionFactory

applicationContext.xml

	
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		
		<property name="dataSource" ref="dataSource">property>
		
		<property name="typeAliasesPackage" value="cn.ming.domain">property>
		
		<property name="mapperLocations" value="classpath:cn/ming/mapper/*Mapper.xml">property>
	bean>

测试：SpringTest

	@Autowired
	private SqlSessionFactory factory;

	@Test
	public void testName() throws Exception {
		System.out.println(factory);
	}

Spring管理Mapper接口

applicationContext.xml

	
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		
		<property name="basePackage" value="cn.ming.mapper">property>
	bean>

测试：SpringTest

	@Autowired
	private EmpMapper mapper;// 代理对象

	@Test
	public void testName() throws Exception {
		List<Emp> list = mapper.findAll();
		list.forEach(System.out::println);
	}

Spring管理Servive层

service包下新建IEmpService

public interface IEmpService {
	
	List<Emp> findAll();
}

service.impl包下新建EmpServiceImpl，加上Service注解

@Service
public class EmpServiceImpl implements IEmpService {

	@Autowired
	private EmpMapper mapper;
	
	@Override
	public List<Emp> findAll() {
		// TODO Auto-generated method stub
		return mapper.findAll();
	}

}

applicationContext.xml

	
	<context:component-scan base-package="cn.ming.service">context:component-scan>

测试：SpringTest

	@Autowired
	private IEmpService service;

	@Test
	public void testName() throws Exception {
		List<Emp> list = service.findAll();
		list.forEach(System.out::println);
	}

Spring整合SpringMVC

准备web.xml

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>day41_ssmdisplay-name>
  
  <servlet>
    <servlet-name>dispatcherServletservlet-name>
    
    <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
    
    <init-param>
      <param-name>contextConfigLocationparam-name>
      <param-value>classpath:springMVC.xmlparam-value>
    init-param>
    
    <load-on-startup>1load-on-startup>
  servlet>
  
  <servlet-mapping>
    <servlet-name>dispatcherServletservlet-name>
    
    <url-pattern>/url-pattern>
  servlet-mapping>
  
  
  <filter>
    <filter-name>characterEncodingfilter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
    <init-param>
      <param-name>encodingparam-name>
      <param-value>UTF-8param-value>
    init-param>
    
    <init-param>
      <param-name>forceEncodingparam-name>
      <param-value>trueparam-value>
    init-param>
  filter>
  <filter-mapping>
    <filter-name>characterEncodingfilter-name>
    <url-pattern>/*url-pattern>
  filter-mapping>
web-app>

准备SpringMVC.xml

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
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/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
	
	
	<context:component-scan base-package="cn.ming.controller" />
	
	
	<mvc:default-servlet-handler/>
	
	
 	<mvc:annotation-driven />
 	
 	
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/views/">property>
		<property name="suffix" value=".jsp">property>	
	bean>
	
	
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		
		<property name="maxUploadSize">
			
			<value>#{1024*1024*20}value>
		property>
		
		
	bean>
	
beans>

新建包和EmpController

@Controller
public class EmpController {

	@Autowired
	private IEmpService service;
	
	@RequestMapping("/findAll")
	@ResponseBody // 返回json格式数据  不走视图解析器
	public List<Emp> findAll(){
		return service.findAll();
	}
}

web.xml配置监听器

原因：web容器启动时只加载了spring-mvc.xml，并没有加载applicationContext.xml

  <listener>
	  <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
  listener>
	
  <context-param>
	  <param-name>contextConfigLocationparam-name>
	  <param-value>classpath:applicationContext.xmlparam-value>
  context-param>

CRUD练习

见工程

准备部门表

略

实体类

略

controller

查询所有：查询所有后把数据放到request域中，jsp页面取值展示
删除：删除后重定向到查询所有
添加：跳往后端goSave，如果id为空跳转save页面，填值后跳往后端save，对象接收参数，如果没有隐藏域id就添加然后重定向到查询所有
修改：跳往后端goSave，如果id有值，查询此条数据，向request域传值并跳转save页面，save页面取值回显，改数据后跳往后端save，有隐藏域id就修改然后重定向到查询所有

service

略

mapper

mapper.xml文件可以放到resources同路径目录下，编译后是一样的

index.jsp

相对路径与绝对路径

<a href="del?id=${dept.id }">删除a>
<a href="/dept/del?id=${dept.id }">删除a>

A标签都往后端跳，后端跳转页面
添加与修改都是跳往后端同一个接口，然后跳转页面

save.jsp

略

拦截器

流程图

自定义拦截器

interceptor包下新建MyInterceptor

public class MyInterceptor implements HandlerInterceptor {

	// 到达处理器之前执行
	@Override
	public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
		System.out.println("进入拦截器了....");
		return false;
	}

	// 处理器处理之后执行
	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		
	}

	// 响应到浏览器之前执行
	@Override
	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		
	}

}

配置拦截器

springMVC.xml

	
	<mvc:interceptors>
		
		<mvc:interceptor>
			
			<mvc:mapping path="/**"  />
			
			<mvc:exclude-mapping path="/dept/*"/>
			
			<bean class="cn.ming.interceptor.MyInterceptor" />  
		mvc:interceptor>
	mvc:interceptors>