java Web(Jsp和Servlet登录校验)

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1、Login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><html>  <head>    <title>用户注册</title>  </head>  <body>  <form action="LoginServlet" method="post">  <h4>用户注册</h4>  username: <input type = "username" name = "username"><br>  password: <input type = "password" name = "password"><br>  repassword: <input type = "password" name = "repassword"><br>  age:<input type = "Text" name = "age"><br>  <input type = "submit" value = "提交">&nbsp;&nbsp;&nbsp;<input type = "reset" value = "重置">  </form>  </body></html>

2、web.xml

<?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>Login</display-name>  <servlet>    <servlet-name>LoginServlet</servlet-name>    <servlet-class>com.servlet.LoginServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>LoginServlet</servlet-name>    <url-pattern>/LoginServlet</url-pattern>  </servlet-mapping></web-app>

3、LoginServlet.java

package com.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 LoginServlet extends HttpServlet {    private static final String MESSAGE1 = "登录成功";    private static final String MESSAGE2 = "密码错误";    private static final String MESSAGE3 = "年龄错误";    private static final String MESSAGE4 = "密码和年龄错误";    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String name = request.getParameter("username");        String pass = request.getParameter("password");        String repass = request.getParameter("repassword");        String age = request.getParameter("age");        //String 类型 转化为int 类型        int a = Integer.parseInt(age);        if (isPassword(pass, repass) && isAge(a)) {            demo(request, response, MESSAGE1);        } else if (!isPassword(pass, repass) && isAge(a)) {            demo(request, response, MESSAGE2);        } else if (isPassword(pass, repass) && !isAge(a)) {            demo(request, response, MESSAGE3);        } else if (!isPassword(pass, repass) && !isAge(a)) {            demo(request, response, MESSAGE4);        }    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.doGet(request, response);    }    private void demo(HttpServletRequest request, HttpServletResponse response,            String string) throws ServletException, IOException {        response.setCharacterEncoding("UTF-8");        request.setCharacterEncoding("UTF-8");        response.setContentType("text/html");        PrintWriter out = response.getWriter();        out.print("<html><head><title>Page</title></head>");        out.print("<body>" + string + "</body></html>");        out.flush();    }    //判断是否相等    private boolean isPassword(String str1, String str2) {        if (str1.equals(str2)) {            return true;        }        return false;    }    //年龄是否符合    private boolean isAge(int age) {        if ((0 <= age && age >=18)) {            return true;        }        return false;    }}

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