过滤器登录界面无法进入下一个页面
AuthFilter
package com.linmin.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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.linmin.domain.User;
@WebFilter("/AuthFilter")
public class AuthFilter implements Filter {
public AuthFilter() {
// TODO Auto-generated constructor stub
}
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest hrequest = (HttpServletRequest)request;
HttpServletResponse hresponse = (HttpServletResponse)response;
//获取会话请求中的用户名/密码
String username = (String)hrequest.getSession().getAttribute("username");
String password = (String)hrequest.getSession().getAttribute("password");
System.out.println(username);
System.out.println(password);
if (username == null || password == null) {
hresponse.sendRedirect(hrequest.getContextPath() + "/login.jsp");
return;
} else {
chain.doFilter(hrequest, hresponse);
return;
}
}
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
}
}login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录</title>
<link rel="stylesheet" href="css/login.css">
<script type="text/javascript">
function changeImg(){
var codeImg = document.getElementById("codeImg");
codeImg.src="${pageContext.request.contextPath }/KaptchaServlet?time="+new Date().getTime();
}
</script>
</head>
<body>
<div class="login">
<div class="header">
<h1>
<a href="/login.do">登录</a>
</h1>
<p>${ msg }</p>
<button></button>
</div>
<form method="post" action="${pageContext.request.contextPath }/LoginServlet">
<div class="name">
<input type="text" id="name" name="username">
<p></p>
</div>
<div class="pwd">
<input type="password" id="pwd" name="password">
<p></p>
</div>
<div class="code">
<input type="text" id="code" name="checkCode" style="width: 150px">
<img id="codeImg" onclick="changeImg()" src="${pageContext.request.contextPath }/KaptchaServlet" style="width: 150px; height: 42px; vertical-align: middle;">
<p></p>
</div>
<div class="btn-red">
<input type="submit" value="登录" id="login-btn">
</div>
</form>
</div>
</body>
</html>EncodeFilter
package com.linmin.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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebFilter("/EncodeFilter")
public class EncodeFilter implements Filter {
private String encoding;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
encoding=filterConfig.getInitParameter("encoding");
System.out.println("encoding:"+encoding);
}
public EncodeFilter() {
// TODO Auto-generated constructor stub
}
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest)request;
req.setCharacterEncoding(encoding);
HttpServletResponse res = (HttpServletResponse)response;
res.setContentType("text/html;charset=" + encoding);
chain.doFilter(request, response);
}
}web.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" id="WebApp_ID" version="3.1"> <servlet> <servlet-name>KaptchaServlet</servlet-name> <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class> <!-- 修改随机的字母或数字的长度 --> <init-param> <param-name>kaptcha.textproducer.char.length</param-name> <param-value>4</param-value> </init-param> <!-- 修改字体大小 --> <init-param> <param-name>kaptcha.textproducer.font.size</param-name> <param-value>25</param-value> </init-param> <init-param> <param-name>kaptcha.textproducer.char.space</param-name> <param-value>10</param-value> </init-param> <!-- 修改图片的宽高 --> <init-param> <param-name>kaptcha.image.width</param-name> <param-value>120</param-value> </init-param> <init-param> <param-name>kaptcha.image.height</param-name> <param-value>30</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>KaptchaServlet</servlet-name> <url-pattern>/KaptchaServlet</url-pattern> </servlet-mapping> <display-name>libraryPro</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标签用于说明哪个类是过滤器，并在应用启动时自动加载 --> <filter> <filter-name>AuthFilter</filter-name> <filter-class>com.linmin.filter.AuthFilter</filter-class> </filter> <filter> <filter-name>EncodeFilter</filter-name> <filter-class>com.linmin.filter.EncodeFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <!-- filter-mapping标签用于说明过滤器对URL应用的范围，要点有二 1.filter-name 过滤器名称与filter.filter-name保持一致 2.url-pattern 说明过滤器作用范围，/* 代表对所有的URL进行过滤 --> <filter-mapping> <filter-name>EncodeFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter-mapping> <filter-name>AuthFilter</filter-name> <url-pattern>/bookList.jsp</url-pattern> </filter-mapping> <filter-mapping> <filter-name>AuthFilter</filter-name> <url-pattern>/addBook.jsp</url-pattern> </filter-mapping> <filter-mapping> <filter-name>AuthFilter</filter-name> <url-pattern>/categoryList.jsp</url-pattern> </filter-mapping> <filter-mapping> <filter-name>AuthFilter</filter-name> <url-pattern>/addCategory.jsp</url-pattern> </filter-mapping> </web-app>
还有怎样可以对css等样式不拦截？
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2回答
同学你好，1、过滤器登录界面无法进入下一个页面，是已经进入到login.jsp页面后，无法再跳转页面吗？ 如果是，同学可以 在LoginServlet查看，登录提交后，是否正常跳转到Servlet中，条件不成立造成的页面没有跳转吗
如果不是，还麻烦同学具体描述一下，过滤器登录界面是不能进入到login.jsp页面中吗？
2、怎样可以对css等样式不拦截
同学可以获取地址，判断是否是css等文件，如果是，直接放行。
如果我的回答解决了你的疑惑，请采纳。祝：学习愉快~
慕神2312244
2020-02-29 15:06:33
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
//排除掉css、图片等
String url=req.getRequestURI();
if(url.indexOf(".css")>0||url.indexOf(".jpg")>0||url.indexOf(".png")>0) {
chain.doFilter(request, response);
return;
}
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