[求助 servlet] 页面无法跳转

最新推荐文章于 2023-03-21 08:42:58 发布

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最新推荐文章于 2023-03-21 08:42:58 发布

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分类专栏： JavaEE Servlet 文章标签： java web.xml

本文链接：https://blog.youkuaiyun.com/ZhangTingkuo/article/details/84488315

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本文详细介绍了如何解决登录验证网页无法实现跳转的问题，包括登录界面、登录分析界面及登录成功后的欢迎界面的实现，并通过web.xml配置完成URL映射。

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一个简单的用户登录验证网页，但是无法实现跳转

下面是源码。

登录界面：

//登陆界面

package com.arlen.java.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

public class Login extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		//中文乱码
		resp.setContentType("text/html; charset=gbk");
		
		PrintWriter pw = resp.getWriter();
		
		pw.println("<html>");
		pw.println("<head>");
		pw.println("<title> Login Page </title>");
		pw.println("</head>");
		pw.println("<body><center>");
		pw.println("<h1>登录界面</h1><hr>");
		pw.println("<form action=login_analyse method=post>");
		pw.println("姓名：<input type=text name=userName><br><br>");
		pw.println("密码：<input type=password name=passwd><br><br>");
		pw.println("<input type=submit value=login><br><hr>");
		pw.println("</center></body>");
		pw.println("</html>");
		pw.println("");
		pw.println("");
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

}

登录分析界面

package com.arlen.java.servlet;

import java.io.IOException;

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

public class LoginAnalyse extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub

		// 接收姓名和密码
		String name = req.getParameter("userName");
		String pwd = req.getParameter("passwd");

		if (name.equals("abc") && pwd.equals("123")) {
			resp.sendRedirect("login");
		} else {
			resp.sendRedirect("welcome");
		}
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

}

登陆成功后转到的欢迎界面

package com.arlen.java.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

public class Welcome extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub

		// 中文乱码
		resp.setContentType("text/html; charset=gbk");

		PrintWriter pw = resp.getWriter();

		pw.println("<html>");
		pw.println("<head>");
		pw.println("<title> Welcome </title>");
		pw.println("</head>");
		pw.println("<body><center>");
		pw.println("<h1>Welcome</h1><hr>");
		pw.println("</center></body>");
		pw.println("</html>");
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

}

web.xml配置

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	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>MyWebSite</display-name>

	<description>
	Welclme to MyWebSite
	</description>

	<!-- JSPC servlet mapping start -->
	<!-- Login -->
	<servlet>
		<!-- 给你的servlet取名，任意 -->
		<servlet-name>Login</servlet-name>
		<!-- 指明servlet的路径（包名+类名） -->
		<servlet-class>com.arlen.java.servlet.Login</servlet-class>
	</servlet>

	<servlet-mapping>
		<!-- 给你的servlet取名，任意 -->
		<servlet-name>Login</servlet-name>
		<!-- 在浏览器中输入的访问该servlet的url，任意 -->
		<url-pattern>/login</url-pattern>
	</servlet-mapping>

	<!-- Login Analyse -->
	<servlet>
		<!-- 给你的servlet取名，任意 -->
		<servlet-name>LoginAnalyse</servlet-name>
		<!-- 指明servlet的路径（包名+类名） -->
		<servlet-class>com.arlen.java.servlet.LoginAnalyse</servlet-class>
	</servlet>

	<servlet-mapping>
		<!-- 给你的servlet取名，任意 -->
		<servlet-name>LoginAnalyse</servlet-name>
		<!-- 在浏览器中输入的访问该servlet的url，任意 -->
		<url-pattern>/login_analyse</url-pattern>
	</servlet-mapping>

	<!-- Login Analyse -->
	<servlet>
		<!-- 给你的servlet取名，任意 -->
		<servlet-name>Welcome</servlet-name>
		<!-- 指明servlet的路径（包名+类名） -->
		<servlet-class>com.arlen.java.servlet.Welcome</servlet-class>
	</servlet>

	<servlet-mapping>
		<!-- 给你的servlet取名，任意 -->
		<servlet-name>Welcome</servlet-name>
		<!-- 在浏览器中输入的访问该servlet的url，任意 -->
		<url-pattern>/welcome</url-pattern>
	</servlet-mapping>

	<!-- JSPC servlet mapping end -->

	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
</web-app>