spring MVC 登录拦截案列
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//login.jsp 登录界面
其中的 name=“??” 的属性值必须和model中User类的属性名称一致(表单里的属性个数可以少于User中的属个数),目的是spring的映射
<%@ 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>Insert title here</title>
</head>
<body>
<form action="login" method="post">
姓名: <input type="text" name="name" ><br/>
密码: <input type="password" name="age" ><br/>
<input type="submit" value="提交" >
</form>
</body>
</html>
//controller 类
其中RequestMapping 必须在方法上写,类上面可写可不写 。 页面跳转的内容在本文后会有补充
package com.community.controller;
import java.io.IOException;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.community.model.User;
import com.community.survice.UserService;
@Controller
public class LoginController {
@Resource
private UserService userService ;
@RequestMapping("/hello")
public void test(HttpServletResponse response) throws IOException{
response.getWriter().write("nihaos");
}
@RequestMapping("/login")
public String fun(HttpServletRequest request,User user){
boolean flag = userService.check(user);
if(flag ){
HttpSession session = request.getSession(true);
session.setAttribute("user", user.getName());
return "index" ;
}
return "redirect:login.jsp" ;
}
}
//interceptor 拦截器
preHandle 方法如果返回的true ,则不拦截controller 的内容;如果为false ,则拦截内容如果想在这里跳转界面,必须在返回false之前
package com.community.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
public class LoginInterceptor implements HandlerInterceptor {
/**
* 在Controller处理方法执行之后,在被渲染之前 执行
* 关闭,释放,处理一些Controller执行中需要的资源
* */
@Override
public void afterCompletion(HttpServletRequest arg0,
HttpServletResponse arg1, Object arg2, Exception arg3)
throws Exception {
}
/**
* 在Controller处理方法执行之后,在被渲染之前 执行
* 关闭,释放,处理一些Controller执行中需要的资源
* */
@Override
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
Object arg2, ModelAndView arg3) throws Exception {
}
/**
* 在Controller的处理方法之前被执行
* 执行一些初始化,权限判断,日志等处理
* 如果返回false 将不会执行Controller中的处理方法
* */
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
Object arg2) throws Exception {
System.out.println("-----处理前-----");
HttpSession session = request.getSession();
Object obj = session.getAttribute("user");
boolean flag =false ;
if(obj != null){
return true;
}else{
//response.sendRedirect(request.getContextPath()+"/login.jsp");
request.getRequestDispatcher("/login.jsp").forward(request,response);
// return "forward:login.jsp";// 不可以,因为要返回boolean类型
return false ;
}
}
}
package com.community.model;
public class User {
String name;
int age;
public User() {}
public User(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
//src 下的bean文件
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- 识别我们的注解标示 -->
<context:component-scan base-package="com.community"/>
<!-- 拦截器 -->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/><!--该路径以及它下面的子路径-->
<mvc:exclude-mapping path="/login"/><!-- /login请求不拦截 -->
<bean class="com.community.interceptor.LoginInterceptor"></bean><!--对应的拦截器-->
</mvc:interceptor>
</mvc:interceptors>
<!-- json字符串转化 -->
<bean id="stringConverter"
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/plain;charset=UTF-8</value>
</list>
</property>
</bean>
<bean id="jsonConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="stringConverter" />
<ref bean="jsonConverter" />
</list>
</property>
</bean>
<!-- 不拦截以下静态资源 -->
<mvc:annotation-driven />
<mvc:resources location="/js/" mapping="/js/**"/>
<!-- 渲染 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
这个小项目的 要注意的事项以及流程整理:
login.jsp---------(interceptor)------------controller-----------index,jsp(一般情况下放在WEB-INF 下,为了是不让别人直接访问。)
login.jsp 跳转到controller ,进行登录,在controller中验证用户名和密码的准确性,正确跳转到主页index.jsp
-----------------------------------------------------------------------------------------------controller 中的跳转---------------------------------------------------------------------
方式一:通过ServletAPI对象来实现
1. @RequestMapping("/redirect")
publicvoidredirectJump(HttpServletRequestrequest,
HttpServletResponse response)throwsException {
response.sendRedirect(request.getContextPath()+"/jsp/JSPRedirect.jsp");
}
2. @RequestMapping("/forward")
publicvoidforwardJump(HttpServletRequestrequest,
HttpServletResponse response)throwsException {
request.getRequestDispatcher("/jsp/JSPForward.jsp").forward(request,response);
}
方式二:通过springmvc实现转发和重定向
(需要在bean 中配置渲染器 ;<beanid="viewResolver"class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<propertyname="viewClass"value="org.springframework.web.servlet.view.JstlView"/>
<propertyname="prefix"value="/WEB-INF/jsp/"/>
<propertyname="suffix"value=".jsp"/>
</bean> )
1.@RequestMapping("/mvcdefault")
publicString mvcDefaultJump(HttpServletRequest request,
HttpServletResponseresponse)throws Exception {
return"index"; //直接跳转到项目的/WEB-INF/jsp/index.jsp
}
2.@RequestMapping("/mvcforward")
publicString mvcForwardJump(HttpServletRequest request,
HttpServletResponseresponse)throws Exception {
System.out.println("/mvcforward");
return"forward:index.jsp"; //forward 表示直接跳转到项目下 ,(和WEB-INF平级)然后查找index.jsp
}
3.@RequestMapping("/mvcredirect")
publicString mvcRedirectJump(HttpServletRequest request,
HttpServletResponseresponse)throws Exception {
System.out.println("/mvcredirect");
return"redirect:index.jsp";
}
-----------------------------------------------------------------web.xml----------------------------------------------------------------------
--------
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param><!--DispatcherServlet初始化配置-->
<param-name>contextConfigLocation</param-name>
<param-value>classpath:mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup><!–服务启动就加载-->
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern><!--除了.jsp其他都能匹配-->
</servlet-mapping>
<context:component-scanbase-package="com"></context:component-scan>
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