package com.caiduping;

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;

public class CharactorFilter implements Filter {

	//字符编码

	String encoding=null;

	@Override

	public void destroy() {

		// TODO Auto-generated method stub

		encoding=null;

	}

	@Override

	public void doFilter(ServletRequest request, ServletResponse response,

			FilterChain chain) throws IOException, ServletException {

		// TODO Auto-generated method stub

			//设置request的编码格式

			request.setCharacterEncoding("UTF-8");

			//设置response的字符编码

			//response.setContentType(encoding);

			response.setContentType("text/html;charset=UTF-8");

		chain.doFilter(request, response);

	}

	@Override

	public void init(FilterConfig filterConfig) throws ServletException {

		// TODO Auto-generated method stub

		encoding=filterConfig.getInitParameter("encoding");

	}

}

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0"

	xmlns="http://java.sun.com/xml/ns/javaee"

	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

  <display-name></display-name>

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

  <filter>

  <filter-name>CharactorFilter</filter-name>

  <filter-class>com.caiduping.CharactorFilter</filter-class>

  <init-param>

  <param-name>CharactorFilter</param-name>

	<param-value>UTF-8</param-value>

  </init-param>

  </filter>

  <filter-mapping>

  <filter-name>CharactorFilter</filter-name>

  <url-pattern>/*</url-pattern>

  </filter-mapping>

  <servlet>

  <servlet-name>AddServlet</servlet-name>

  <servlet-class>com.caiduping.AddServlet</servlet-class>

  </servlet>

  <servlet-mapping>

  <servlet-name>AddServlet</servlet-name>

  <url-pattern>/AddServlet</url-pattern>

  </servlet-mapping>

</web-app>

package com.caiduping;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class AddServlet extends HttpServlet {

	//serialVersionUID 用来表明类的不同版本间的兼容性

	private static final long serialVersionUID = 1L;

	@Override

	protected void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		// TODO Auto-generated method stub

		//处理GET请求

		doPost(request, response);

	}

	@Override

	protected void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		// TODO Auto-generated method stub

		//当一个Servlet响应的时候将响应信息通过out对象输出到网页上，当响应结束时它自动被关闭

		PrintWriter out=response.getWriter();

		String name=request.getParameter("name");

		String sex=request.getParameter("sex");

		String age=request.getParameter("age");

		String fav=request.getParameter("fav");

		out.print("信息验证<br>");

		out.print("姓名："+name+"<br>");

		out.print("性别："+sex+"<br>");

		out.print("年龄："+age+"<br>");

		out.print("爱好: "+fav+"<br>");

		out.flush();

		out.close();

	}

}