<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Servlet身份驗證過濾器</title>
</head>
<body>
    <div style="font-align: center;">
        <form action="login" method="post">
            用戶名：<input type="text" name="username" value="maxsu"/>密碼：<input type="password"
                name="password" /><input type="submit" value="登錄">
        </form>
    </div>
</body>
</html>

文件：MyFilter.java -

package com.yiibai;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.*;

public class MyFilter implements Filter {

    public void init(FilterConfig arg0) throws ServletException {
        //
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        request.setCharacterEncoding("UTF-8");
        PrintWriter out = response.getWriter();
        String password = request.getParameter("password");
        if (password == null) {
            password = "";
        }

        if (password.equals("admin")) {
            chain.doFilter(request, response);// sends request to next resource
        } else {
            out.print("用戶名或密碼錯誤!");
            RequestDispatcher rd = request.getRequestDispatcher("index.html");
            rd.include(request, response);
        }
    }

    public void destroy() {
        System.out.println("MyFilter.destroy()");
    }

}

文件：AdminServlet.java -

package com.yiibai;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.*;

public class AdminServlet extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        request.setCharacterEncoding("UTF-8");
        PrintWriter out = response.getWriter();

        out.print("歡迎您來到 ADMIN頁面~");
        out.close();
    }
}

文件：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">
    <display-name>AuthenticationFilter</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <servlet>
        <servlet-name>AdminServlet</servlet-name>
        <servlet-class>com.yiibai.AdminServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>AdminServlet</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>f1</filter-name>
        <filter-class>com.yiibai.MyFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>f1</filter-name>
        <url-pattern>/login</url-pattern>
    </filter-mapping>
</web-app>

在編寫上面代碼后，部署此Web應用程序(在項目名稱上點擊右鍵->”Run On Server…”)，打開瀏覽器訪問URL： http://localhost:8080/SimpleFilter/ ，如果沒有錯誤，應該會看到以下結果 -

輸入密碼：admin，然后提交表單登錄，應該會看到以下結果 -

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Servlet身份驗證過濾器

使用過濾器驗證用戶的示例