'Interceptor与Controller的使用

------------------------------------------------------------------拦截器类
package com.jcl.interceptor;

import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.ui.ModelMap;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class Interceptor implements HandlerInterceptor{
    
    / * *在Controller的处理方法调用之前
     * 如果返回false，则不再进入Controller，流程会被中断
     * request ：请求对象   
     * response：响应对象   
     * obj：代表当前的Controller的方法（HandlerMethod）
    */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        
        return true;
    }
    /* 在Controller方法执行之后，创建ModelAndView之后，视图渲染之前拦截
         */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
//        //方法一：
//        ModelMap modelMap = modelAndView.getModelMap();
//        Integer num =(Integer) modelMap.get("info");
//        if(num%3==0) {
//        num=num*10;
//        modelAndView.addObject("info",num);        
//    }
        //方法二:
//        int num= (int)request.getSession().getAttribute("info");
//        if(num%3==0) {
//            num=num*10;
//            request.getSession().setAttribute("info", num);
//        }
    }
     /* 视图渲染完毕，一般用于收尾操作
         */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        // TODO Auto-generated method stub
        
    }

}
-----------------------------------------------------------------------------控制器类
package com.study.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.study.pojo.User;

@Controller
public class LoginController {
    @RequestMapping(value="/login",method = {RequestMethod.GET})
    public String login() {
        return "login";

    }
    @RequestMapping(value="/win",method = {RequestMethod.GET})
    public String win() {
        return "win";

    }
    @RequestMapping(value="/login",method = {RequestMethod.POST})
    public ModelAndView login2(@ModelAttribute("u") User user) {
        ModelAndView mv = new ModelAndView();
        if(!user.verify()) {
            mv.setViewName("login");
            mv.addObject("user",user);
            return mv;
        }else {
            mv.setViewName("redirect:/win");
            return mv;
        }
        
    }
}
-----------------------------------------------------------------------
package com.study.controller;


import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class OrderController {

    @RequestMapping(value="/index",method= {RequestMethod.GET})
    public String index() {
        return "order";
    }
    @RequestMapping(value="/index",method= {RequestMethod.POST})
    public String one(String orderName,String money,String address,String time) {
        System.out.println("产品姓名："+orderName);
        System.out.println("产品价格："+money);
        System.out.println("出版地址："+address);
        System.out.println("生产日期："+time);
        
        return "order";
    }
}
--------------------------------------------------------------
package com.study.controller;

import java.util.Random;

import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class TextController {
//    @RequestMapping("/work")
//    private ModelAndView workController() {
//         Random random = new Random();
//        int num=random.nextInt(100)%(300-100+1) + 100;
//        System.out.println("随机数："+num);
//        ModelAndView mv =new ModelAndView();
//        mv.addObject("info",random);
//        mv.setViewName("controllerWork");
//        return mv;
//    }
    @RequestMapping("/work")
    private String workController(HttpSession session) {
         Random random = new Random();
         //方法一：
    //     int num=(int) (Math.random()*200+100);
         //方法二：
        int num=random.nextInt(100)%(300-100+1) + 100;
        System.out.println("随机数："+num);
        session.setAttribute("info", num);
        
        return "controllerWork";
    }
}
------------------------------------------------------applicationContext.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:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:p="http://www.springframework.org/schema/p"
    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/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
    <context:component-scan base-package="com.study"/>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <!-- 前缀：指定视图存在哪个文件夹 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 后缀：指定视图的后缀名 -->
        <property name="suffix" value=".jsp"/>
    </bean>
    <mvc:interceptors>
    <mvc:interceptor>
    <mvc:mapping path="/work"/><!-- 拦截的对象 -->
    <bean class="com.jcl.interceptor.Interceptor"/><!-- 谁来拦截 -->
    </mvc:interceptor>
    </mvc:interceptors>
        <!-- 动态资源交给web.xml中配置的DispatcherServlet来处理
          静态的资源交给默认的前端控制器来处理
     -->
    <mvc:annotation-driven/>
    <mvc:default-servlet-handler />
</beans>
--------------------------------------------------------------------------web.xml
<?xml version="1.0" encoding="UTF-8"?>
<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">
    <!-- 配置前端控制器 -->
    <servlet>
        <servlet-name>yf1705</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 配置Spring的核心配置文件 src/java/resources-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>yf1705</servlet-name>
        <!-- 映射的根目录：http://localhost:8080/工程名 -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <filter>
      <filter-name>encode</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>
   </filter>
   <filter-mapping>
      <filter-name>encode</filter-name>
      <url-pattern>/*</url-pattern>
   </filter-mapping>

</web-app>
------------------------------------------------------------------------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.study</groupId>
  <artifactId>Spring-Controller</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>Archetype - Spring-Controller</name>
  <url>http://maven.apache.org</url>
   <dependencies>
          <!-- 导入spring的核心jar库 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>
        
        <!-- Spring切面组件依赖库 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>
        
        <!-- SpringJDBC依赖库 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>
        
        <!-- Spring事务依赖库 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>
        
        <!-- Spring MVC依赖库 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>
        
        <!-- jstl表达式 -->
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
  </dependencies>
  
  <build>
          <!-- 配置java源文件夹-->
        <sourceDirectory>src/main/java</sourceDirectory>
        <plugins>
            <plugin>
                <!-- 指定工程编译版本为jdk1.8 -->
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.3</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <warSourceDirectory>WebContent</warSourceDirectory>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
  </build>
  
  <!-- 配置项目发布之后的格式 -->
  <packaging>war</packaging>
</project>
------------------------------------------------------------jsp文件

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>win</title>
</head>
<body>
登陆成功
</body>
</html>
-------------------------------------------------------------
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>order</title>
</head>
<body>
    <form method="post">
    <table>
        <tr>
        <td>产品名称：</td>
        <td><input type="text" name="orderName"></td>
        </tr>
        
        <tr>
        <td>产品价格：</td>
        <td><input type="text" name = "money"></td>
        </tr>
        <tr>
        <td>产地：</td>
        <td><input type="text" name = "address"></td>
        </tr>
        <tr>
        <td>生产日期：</td>
        <td><input type="date" name="time"></td>
        </tr>
        <tr>
        <td><input type="submit" ></td>
        </tr>
    </table>
    </form>
</body>
</html>
-----------------------------------------------
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>login</title>
</head>
<body>
<form method="post">
    <table>
        <tr>
        <td>用户名称：</td>
        <td><input type="text" name="uName" value="${user.uName}"></td><td style ="color: red">${user.error.uName}</td>
        </tr>
        
        <tr>
        <td>密码：</td>
        <td><input type="password" name = "passWord" value="${user.passWord}"></td><td style ="color: red">${user.error.passWord}</td>
        </tr>
        <tr>
        <td>确认密码：</td>
        <td><input type="password" name = "passWord2" value ="${user.passWord2}"></td><td style ="color: red">${user.error.passWord2}</td>
        </tr>
        <tr>
        <td>联系电话：</td>
        <td><input type="text" name="phone" value="${user.phone}"></td><td style ="color: red">${user.error.phone}</td>
        </tr>
        <tr>
        <td><input type="submit"></td>
        </tr>
    </table>
    </form>
</body>
</html>
---------------------------------------------------
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>controllerWork</title>
</head>
<body>
${info}
</body>
</html>




/*------------------------------------------程序流程
jsp发送请求->控制器（选择RequestMapping）->@RequestMapping("/work")进行读取->返回jsp
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       拦截器进行操作              拦截器进行操作                     拦截器进行操作 */