package jmeterClass;

/**

* Created by xglh on 2017-7-21.

*/

import java.io.*;

import java.net.*;

import java.util.List;

import java.util.Map;

public class HttpRequest {

//方法重写，实现headers默认为空

public static String sendHead(String url,String host){

String[][] headers = {};

return HttpRequest.sendHead(url,host,headers);

}

/**

* 发送http head请求,只接受响应头，不接受响应内容

* @param url 请求的url

* @param host 代理,支持形如 192.168.2.235 192.168.2.2.235:8083的形式,为""表示不设代理

* @param headers 请求头,二维String数组形式

* @return

*/

public static String sendHead(String url,String host,String[][] headers) {

String result = "";

BufferedReader in = null;

String code = "";

try {

URL realUrl = new URL(url);

URLConnection connection;

String hostname = "";

int port = 0;

if(host != ""){

hostname = host;

port = 80;

if (host.indexOf(":") >= 0){

hostname = host.substring(0,host.indexOf(":"));

port = Integer.parseInt(host.substring(host.indexOf(":") + 1,host.length()));

}

InetSocketAddress addr = new InetSocketAddress(hostname,port);

Proxy proxy = new Proxy(Proxy.Type.HTTP, addr); // http 代理

connection = realUrl.openConnection(proxy);

}

else{

connection = realUrl.openConnection();

}

// 打开和URL之间的连接

HttpURLConnection httpUrlConnection = (HttpURLConnection) connection;

//发送head请求,不接受返回内容，只接受响应头

httpUrlConnection.setRequestMethod("HEAD");

// 设置请求头

for(int i = 0;i<headers.length;i++){

connection.setRequestProperty(headers[i][0], headers[i][1]);

}

// 建立实际的连接

httpUrlConnection.connect();

//获取响应码

code = new Integer(httpUrlConnection.getResponseCode()).toString();

// 获取所有响应头字段

Map<String, List<String>> map = connection.getHeaderFields();

in = new BufferedReader(new InputStreamReader(

connection.getInputStream()));

String line;

while ((line = in.readLine()) != null) {

result += line;

}

httpUrlConnection.disconnect();

} catch (Exception e) {

}

// 使用finally块来关闭输入流

finally {

try {

if (in != null) {

in.close();

}

} catch (Exception e2) {

e2.printStackTrace();

}

}

return code;

}

}