测试服务器响应时间

所谓的响应时间，就是从客户端开始发出请求到服务器最后返回请求时所消耗的时间，见代码

package com.speed;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Array;
import java.net.URL;

public class TestServer {
  static int loopTimes = 500;

  public Parameter readFromArgFile(String str) {
    FileInputStream fileInput;
    BufferedReader br;
    Parameter param = new Parameter();
    try {
      fileInput = new FileInputStream(new File(str));
      br = new BufferedReader(new InputStreamReader(fileInput));

      String line;
      while ((line = br.readLine()) != null) {
        if (line.startsWith("URL") == true && line.indexOf("=") >= 3) {
          int f = line.indexOf("=");
          String urlstring = line.substring(f + 1);
          urlstring.trim();
          param.url = new URL(urlstring);
        } else if (line.startsWith("METHOD") == true
            && line.indexOf("=") >= 3) {
          int f = line.indexOf("=");
          String method = line.substring(f + 1);
          method.trim();
          param.method = method;
        } else if (line.indexOf("=") != -1) {
          int f = line.indexOf("=");
          String key = line.substring(0, f - 1);
          String value = line.substring(f + 1);
          param.addPair(key.trim(), value.trim());
        }
      }
      fileInput.close();
      br.close();
    } catch (FileNotFoundException e) {
      System.out.println("File" + str + "not found.");
    } catch (NullPointerException e) {

    } catch (IOException e) {
      System.out.println(e);
    }
    return param;
  }

  public static void main(String[] args) {
    int i;
    int j;
    Parameter param;
    TestServer tester = new TestServer();
    for (i = 0; i < Array.getLength(args); i++) {
      param = tester.readFromArgFile(args[i]);
      for (j = 0; j < loopTimes; j++) {
        Thread th = new Thread(new TestThread(param));
        th.start();
      }
    }
  }
}

package com.speed;

import java.lang.reflect.Array;
import java.net.URL;

public class Parameter {
  URL url;
  String[] key;
  String[] value;
  String method;
  int length = 0;

  public void addPair(String k, String v) {
    Array.set(key, length, k);
    Array.set(value, length, v);
    length++;
  }
}

package com.speed;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;

public class TestThread implements Runnable {
  Parameter param;

  TestThread(Parameter par) {
    param = par;
  }

  public void run() {
    long time1 = new Date().getTime();
    try {
      URL target = param.url;
      HttpURLConnection conn = (HttpURLConnection) target
          .openConnection();
      conn.setRequestMethod(param.method);
      int i;
      for (i = 0; i < param.length; i++) {
        conn.setRequestProperty(param.key[i], param.value[i]);
      }
      conn.connect();
      BufferedReader in = new BufferedReader(new InputStreamReader(conn
          .getInputStream()));
      String inputLine;
      while ((inputLine = in.readLine()) != null);
    } catch (Exception e) {

    }
    long time2 = new Date().getTime();
    System.out.println((time2 - time1)/1000+"秒");
  }

}

由于这个是在命令行模式下运行的，我的附件是这样写的

URL=http://mail.163.com
METHOD=GET
User-Agent=Internet Explorer
Host=mail.163.com
Accept=p_w_picpath/gif, p_w_picpath/x-xbitmap, p_w_picpath/jpeg, p_w_picpath/pjpeg, application/x-shockwave-flash, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/x-silverlight, */*
Accept-Language=zh-cn
Content-Type=application/x-www-form-urlencoded
Accept-Encoding=gzip, deflate
User-Agent=Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Foxy/1; .NET CLR 2.0.50727;MEGAUPLOAD 1.0)
Connection=Keep-Alive
Cache-Control=no-cache

我们来测试一下163的邮件服务器，最后响应时间为14秒，可是单独打开网页的话马上就出现页面了，难道是ajax的过吗？提前展现页面？如果真让用户等待14秒，那还不得疯了，这是个问题，有知道这是为什么的朋友，给我留言告诉我哦！