Java学习笔记·Servlet&Filter过滤器配置实例（web.xml配置方法）准备一个Servlet（Lesson2/lesson6_2.Sample7.java）Filter代码段：（Lesson2/lesson6_2.SampleFilter.java）web.xml配置（WEB-INF/web.xml）执行结果：说明：

72 阅读 0 评论 48 点赞

我是靠谱客的博主漂亮荔枝，最近开发中收集的这篇文章主要介绍Java学习笔记·Servlet&Filter过滤器配置实例（web.xml配置方法）准备一个Servlet（Lesson2/lesson6_2.Sample7.java）Filter代码段：（Lesson2/lesson6_2.SampleFilter.java）web.xml配置（WEB-INF/web.xml）执行结果：说明：，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

准备一个Servlet（Lesson2/lesson6_2.Sample7.java）

package lesson6_2;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;

//@WebServlet("/Sample7")←此处如果使用webservlet，可以不用在web.xml配置Servlet，但是Filter必须配置
public class Sample7 extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
          try {
            //コンテンツタイプの設定
              response.setContentType("text/html; charset=utf-8");

              PrintWriter pw = response.getWriter();
              pw.println(
                        "お選びください<br/>n"+
                        "<br/>n"+
                        "<a href="../car1.html">乗用車</a><br/>n"+
                        "<a href="../car2.html">トラック</a><br/>n"+
                        "<a href="../car3.html">オープンカー</a><br/>n"
                                );
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }
}

Filter代码段：（Lesson2/lesson6_2.SampleFilter.java）

package lesson6_2;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.*;


/**
 * Servlet Filter implementation class SampleFilter
 */
//@WebFilter("/SampleFilter")
public class SampleFilter implements Filter {

    public void destroy() {
        // TODO Auto-generated method stub
    }

    /**
     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
     */
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        // place your code here
        response.setContentType("text/html; charset=UTF-8");

        PrintWriter pw=response.getWriter();
        pw.println("<html>n"+
                    "<head><title>SampleFilter</title></head>n"+
                    "<body><center>n"+
                    "<h2>こんにちわ</h2>"+
                    "<hr/>n");
        // pass the request along the filter chain
        chain.doFilter(request, response);

        pw.println("<hr/>ありがとうございました.n"+
                "</center></body>n"+
                "</html>"
                );
    }

    /**
     * @see Filter#init(FilterConfig)
     */
    public void init(FilterConfig fConfig)  {
        // TODO Auto-generated method stub
    }

}

web.xml配置（WEB-INF/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>Lesson2</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>SampleFilter</filter-name>
  <filter-class>lesson6_2.SampleFilter</filter-class>
  </filter>

  <filter-mapping>
  <filter-name>SampleFilter</filter-name>
  <url-pattern>/Sample7</url-pattern><!-- 这里的url是需要拦截的url，浏览器访问时首先调用Filter（过滤器）里的内容-->
  </filter-mapping>

  <servlet><!--如果在Sevlet里使用了//@WebServlet("/Sample7")配置url，这里可以不用配置Servlet-->
  <servlet-name>Sample7</servlet-name>
  <servlet-class>lesson6_2.Sample7</servlet-class>
  </servlet>

  <servlet-mapping>
  <servlet-name>Sample7</servlet-name>
  <url-pattern>/Sample7</url-pattern>
  </servlet-mapping>
</web-app>