servlet用户管理项目-优快云博客

本文详细介绍了如何通过Servlet实现用户登录界面，并通过POST请求接收用户名和密码进行身份验证，成功验证后跳转到主框架页面。

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LoginServlet.java

package com.sevend.view;

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;

@SuppressWarnings("serial")
public class LoginServlet extends HttpServlet {

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		//告诉浏览器以utf-8去解析（浏览器的默认编码就会成utf-8）
		response.setCharacterEncoding("utf-8");
		//设置编码方式两者都是同一个作用，配合使用更好
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("<HEAD><TITLE>用户登陆界面</TITLE></HEAD>");
		out.println("<BODY>");
		out.println("<h1>用户登陆</h1>");
		//action路径规范：/web应用名/servlet的url
		out.println("<form action='/UserManage/servlet/LoginCLServlet' method='post'>");
		out.println("用户名：<input type='text' name='username' id='username' /><br/>");
		out.println("密     码：<input type='password' name='password' id='password' /><br/>");
		out.println("<input type='submit' value='登陆' /><br/>");
		out.println("</form>");
		out.println("</BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doGet(request, response);
	}

}

LoginCLServlet.java

package com.sevend.controller;

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;

@SuppressWarnings("serial")
public class LoginCLServlet extends HttpServlet {

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		@SuppressWarnings("unused")
		PrintWriter out = response.getWriter();
		//接受用户提交的用户名和密码
		String username=request.getParameter("username");
		String password=request.getParameter("password");
		
		//验证一下时候能够接受数据
//		System.out.println("username="+username+"password="+password);
		
		if("sevend".equals(username)&&"123".equals(password)){
			//跳转到下一个页面，servlet提供了两种方法：
			//一：sendredirect转向
			//sendredirect的url格式/web应用名称/servlet url
			response.sendRedirect("/UserManage/servlet/MainFrame");
			//二：forward转发
			
		}else{
			response.sendRedirect("/UserManage/servlet/LoginServlet");
		}
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		@SuppressWarnings("unused")
		PrintWriter out = response.getWriter();
		
		this.doGet(request, response);
	}

}

MainFrame.java

package com.sevend.view;

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;

@SuppressWarnings("serial")
public class MainFrame extends HttpServlet {

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out
				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print("MainFrame");
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		@SuppressWarnings("unused")
		PrintWriter out = response.getWriter();

		this.doGet(request, response);
	}

}