还是不行为什么就是没有执行呢？
之前像老师问过。老师那里面是能执行的但是我这边还是不行，通过过滤器跳转后，依然没有执行servlet里面的内容
付上代码
jsp
<%@ 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>注册界面</title>
</head>
<body>
<script type="text/javascript">
var email=<%=request.getParameter("email") %>
if(email==0){
alert("请输入正确的邮箱格式！")
}
var password=<%=request.getParameter("password") %>
if(password==0){
alert("密码不符合格式！")
}
var checkmima=<%=request.getParameter("checkmima") %>
if(checkmima==0){
alert("两次输入的密码格式不符合！")
}
var tel=<%=request.getParameter("tel") %>
if(tel==0){
alert("您输入的手机号不符合格式！")
}
</script>
<center>
<h1>用户注册</h1>
<form method="post" action="<%=request.getContextPath() %>/Regist_servlet">
<table width="400px" cellspacing="0px" cellpadding="0px" border="1px">
<tr>
<td>用户名</td>
<td><input type="text" name="username" placeholder="用户名为3-12位字母数字或下划线组合" ></td>
</tr>
<tr>
<td>密 码</td>
<td><input type="password" name="password" placeholder="密码长度为6-12位的纯数字" id="password"></td>
</tr>
<tr>
<td>确认密码</td>
<td><input type="password" name="checkPWD" placeholder="密码长度为6-12位的纯数字" "></td>
</tr>
<tr>
<td>手机号码</td>
<td><input type="text" name="phone" placeholder="请输入正确的手机号码格式" ></td>
</tr>
<tr>
<td>邮箱</td>
<td><input type="email" name="email" placeholder="请输入正确邮箱格式" required="required"></td>
</tr>
<tr>
<td colspan="2" style="text-align:center">
<input type="submit" value="注册">
<input type="reset" value="重置">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
<display-name>web_homework2</display-name>
<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>
<filter>
<filter-name>login_filter</filter-name>
<filter-class>com.filter.Login_filter</filter-class>
</filter>
<filter-mapping>
<filter-name>login_filter</filter-name>
<url-pattern>/Login_servlet</url-pattern>
</filter-mapping>
<filter>
<filter-name>registfilter</filter-name>
<filter-class>com.filter.Regist_filter</filter-class>
</filter>
<filter-mapping>
<filter-name>registfilter</filter-name>
<url-pattern>/Regist_servlet</url-pattern>
</filter-mapping>
</web-app>
servlet
package com.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.lib.*;
import com.user.User;
@WebServlet("/Regist_servlet")
public class Regist_servlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public Regist_servlet() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Lib a=new Lib();
System.out.println("====进入Servlet");
HttpServletRequest htrequest=(HttpServletRequest)request;
User newuser=new User();
newuser.setUsername(htrequest.getParameter("username"));
newuser.setPassword(htrequest.getParameter("password"));
newuser.setEmail(htrequest.getParameter("email"));
newuser.setTel(htrequest.getParameter("phone"));
a.regist(newuser);//注册完毕
System.out.println("注册完毕");
response.sendRedirect(request.getContextPath()+"/index.jsp?flag=3");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("====进入Servlet");
doGet(request, response);
}
}
正在回答
同学你好，过滤器拦截了Regist_servlet没放行，所以不会执行servlet中的内容。同学需要在输出注册信息填写没有问题的代码后添加arg2.doFilter(htrequest,htresponse)使过滤器放行Regist_servlet。另外同学在Regist_filter中建议使用else-if的结构判断注册信息是否有误，避免出现重复提交的异常。代码如下：
如果我的回答解决了你的疑惑，请采纳。祝：学习愉快！
- 参与学习 人
- 提交作业 1088 份
- 解答问题 10205 个
如果你有Java语言基础，又想以后从事Java Web开发，那么本路径是你的不二选择！本路径从网页搭建开始入手，通过大量案例来学习Java Web基础。定能助你完成Java Web小白的蜕变！
了解课程
恭喜解决一个难题，获得1积分~
来为老师/同学的回答评分吧
0 星