对url发送请求,获得返回值:
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; }