Java请求一个URL。获取网站返回的数据。

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public static String SendGET(String url,String param){   String result="";//访问返回结果   BufferedReader read=null;//读取访问结果       try {    //创建url    URL realurl=new URL(url+"?"+param);    //打开连接    URLConnection connection=realurl.openConnection();     // 设置通用的请求属性             connection.setRequestProperty("accept", "*/*");             connection.setRequestProperty("connection", "Keep-Alive");             connection.setRequestProperty("user-agent",                     "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");             //建立连接             connection.connect();          // 获取所有响应头字段             Map<String, List<String>> map = connection.getHeaderFields();             // 遍历所有的响应头字段，获取到cookies等             for (String key : map.keySet()) {                 System.out.println(key + "--->" + map.get(key));             }             // 定义 BufferedReader输入流来读取URL的响应             read = new BufferedReader(new InputStreamReader(                     connection.getInputStream(),"UTF-8"));             String line;//循环读取             while ((line = read.readLine()) != null) {                 result += line;             }   } catch (IOException e) {    e.printStackTrace();   }finally{    if(read!=null){//关闭流     try {      read.close();     } catch (IOException e) {      e.printStackTrace();     }    }   }        return result;  }
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