获取请求头和请求数据

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>带数据给requestDemo2.html</title>    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="this is my page">    <meta http-equiv="content-type" content="text/html; charset=UTF-8">    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->  </head>  <body>            <!-- url后面如果跟了中文数据，要编码后在提交 -->            <a href="/Servlet/servlet/RequestDemo2?username=xxx">点点</a>            <form action="/Servlet/servlet/RequestDemo2" method="post">                        用户名:<input type="text" name="username">                        <input type="submit" value="提交">            </form>  </body></html>

package request;import java.io.IOException;import java.io.InputStream;import java.util.Enumeration;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;//获取请求头和请求数据//获取请求数据的时候，一般都要先检查再使用public class RequestDemo2 extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {            test1(request);        System.out.println("-----获取数据方式1------");        String value = request.getParameter("username");        //检查        if(value!=null&&!value.trim().equals("")){            System.out.println(value);        }        System.out.println("-----获取数据方式2------");        Enumeration e = request.getParameterNames();        while(e.hasMoreElements()){            String name = (String)e.nextElement();//username            value = request.getParameter(name);            System.out.println(name+"="+value);        }        System.out.println("-----获取数据方式3------");        String[] values = request.getParameterValues("username");        /*for(String v:values){            System.out.println(v);        }*/        for(int i=0;values!=null&&i<values.length;i++){            System.out.println(values[i]);        }        System.out.println("-----获取数据方式4------");        //Map map = request.getParameterMap(); //做框架有用 Map<String,String[]>        System.out.println("-----获取数据方式5------");        //文件上传用这种         InputStream in = request.getInputStream();        int len = 0;        byte buffer[] = new byte[1024];        while((len=in.read(buffer))>0){            System.out.println(new String(buffer,0,len));        }    }    //获取头的相关方法    private void test1(HttpServletRequest request) {        String headValue = request.getHeader("Aceept-Encoding");        System.out.println(headValue);        System.out.println("-----------");        Enumeration e = request.getHeaders("Aceept-Encoding");        while(e.hasMoreElements()){            String value = (String)e.nextElement();            System.out.println(value);        }        System.out.println("-----------");        e = request.getHeaderNames();        while(e.hasMoreElements()){            String name = (String)e.nextElement();            String value = request.getHeader(name);            System.out.println(name+"="+value);        }    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doGet(request, response);    }}

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