使用过滤器在登录尝试失败后重定向

Question

我正在使用Java过滤器来测试身份验证。如果用户输入了正确的用户标识和密码组合，过滤器会有效地将它们转发到 Servlet。但是，如果输入了错误的信息，则会将用户发送回他们来自的登录页面。出于某种原因，当它们被发送回登录页面时，会显示"login.html"文件的代码。下面是筛选器的代码：

package com.simpleServletDemo;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
/**
*
* @author Not Important
*/
@WebFilter("/MyFilterChecker")
public class MyFilterChecker implements Filter {

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
String userID = request.getParameter("txtUser");
String password = request.getParameter("txtPassword");
PrintWriter out = response.getWriter();
if (userID.equals("[e-mail]") && password.equals("password12345")) {
out.print("Success!");
chain.doFilter(request, response); //Sends Request and response to next resource
} else {
out.print("Incorrect Username or Password!");
RequestDispatcher dispatcher = request.getRequestDispatcher("login.html");
dispatcher.include(request, response);
}
}

public void destroy() {        
}

public void init(FilterConfig filterConfig) {        
}
}

我哪里做错了？谢谢！

我还包含了 web.xml 文件来显示映射：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<servlet>
<servlet-name>MyLoginServlet</servlet-name>
<servlet-class>com.simpleServletDemo.MyLoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyLoginServlet</servlet-name>
<url-pattern>/Login</url-pattern>
</servlet-mapping>
<filter>
<filter-name>MyFilterChecker</filter-name>
<filter-class>com.simpleServletDemo.MyFilterChecker</filter-class>
</filter>
<filter-mapping>
<filter-name>MyFilterChecker</filter-name>
<url-pattern>/Login</url-pattern>  
</filter-mapping>
</web-app>

Answer 1

将 dispatcher.include(( 方法更改为 dispatcher.forward(( 方法。您还可以使用 response.redirect(( 方法转发到登录.html文件。