Spring MVC（二）基于注解的登陆界面获取用户名和密码并跳转其它页面

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基于注解实现在登陆界面填写用户名和密码，提交后获取用户名和密码跳转到另一个页面

项目结构图：

一、新建一个JAVA WEB项目，并导入Spring的相关JAR包,并在web.xml中声明拦截器DispatcherServlet

<span style="font-size:18px;"><?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  <display-name>springmvc01</display-name>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>  <servlet>    <servlet-name>springmvc</servlet-name>    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>springmvc</servlet-name>    <url-pattern>/</url-pattern>  </servlet-mapping></web-app></span>

二、在WEB-INF下创建Spring配置文件，命名规则是【servlet-name】-servlet.xml，所以根据web.xml中可知，我们在WEB-INF下面创建springmvc-servlet.xml配置文件，在里面配置控制器和视图解析器

<?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:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"><!-- mvc注解驱动 --><mvc:annotation-driven/><!--只要定义了扫描器，注解驱动就不需要，扫描器已经有了注解驱动的功能 --><context:component-scan base-package="com.liu.controller"/><!-- 配置HandlerMapping  根据benaname找到对应Conntroller  --><!--  <beanclass="org.springframework.web.servlet.mvc.support.ControllerBeanNameHandlerMapping"></bean>--><!-- 配置Controller --><!--  <bean  name="index.do" class="com.liu.controller.HelloController"></bean>--><!-- 配置视图解析器 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!-- 前缀 --><property name="prefix" value="/view/"></property><!-- 后缀 --><property name="suffix" value=".jsp"></property></bean></beans>

三、在WebContent下创建hello.jsp页面，发出请求：

<span style="font-size:18px;"><%@ 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="index.do" method="post">用户名:<input type="text" name="username"/>密    码:<input type="text" name="password"> <input type="submit" value="提交"/></form></body></html></span>

四、在WebContent目录下创建文件夹view，里面用于渲染的jsp界面，并在里面新建index.jsp用于渲染：

<span style="font-size:18px;"><%@ 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><table border="1"><tr><th>用户名</th><th>密码</th></tr><tr><td>${username }</td><td>${password }</td></tr></table></body></html></span>

五、创建控制器HelloController 继承AbstractController重写handleRequestInternal：

<span style="font-size:18px;">package com.liu.controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.AbstractController;@Controller@RequestMapping("/test")public class HelloController  {@RequestMapping("/index.do")public String users(HttpServletRequest request,HttpServletResponse response) throws Exception{String username = request.getParameter("username");String password = request.getParameter("password");System.out.println("----:"+username);System.out.println("----:"+password);request.setAttribute("username", username);request.setAttribute("password", password);return "/index";}}</span>

六、解决中文乱码问题，Utf8Filter.java：

package com.liu.filter;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.annotation.WebFilter;/** * Servlet Filter implementation class Utf8Filter */@WebFilter("/*")public class Utf8Filter implements Filter {    /**     * Default constructor.      */    public Utf8Filter() {    }/** * @see Filter#destroy() */public void destroy() {}/** * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain) */public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {request.setCharacterEncoding("utf-8");chain.doFilter(request, response);}/** * @see Filter#init(FilterConfig) */public void init(FilterConfig fConfig) throws ServletException {}}

运行结果：

点击提交后在index.jsp进行渲染

后台并输出：

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