JAVA访问http接口得到返回数据

第一种：

1	public static String getURLContent(String urlStr) {
2		/** 网络的url地址 */
3		URL url = null;
4		/** http连接 */
5		HttpURLConnection httpConn = null;
6		/**//** 输入流 */
7		BufferedReader in = null;
8		StringBuffer sb = new StringBuffer();
9		try {
10			url = new URL(urlStr);
11			in = new BufferedReader(new InputStreamReader(url.openStream(), "GBK"));
12			String str = null;
13			while ((str = in.readLine()) != null) {
14				sb.append(str);
15			}
16		} catch (Exception ex) {
17 
18		} finally {
19			try {
20				if (in != null) {
21					in.close();
22				}
23			} catch (IOException ex) {
24			}
25		}
26		String result = sb.toString();
27		System.out.println(result);
28		return result;
29	}

第二种：

1//http请求返回json
2			public static String httpGetJson(String url){
3				    String result = "";
4			        BufferedReader in = null;
5			        try {
6			            String urlNameString = url;
7			            URL realUrl = new URL(urlNameString);
8			            // 打开和URL之间的连接
9			            URLConnection connection = realUrl.openConnection();
10			            // 设置通用的请求属性
11			            //connection.setRequestProperty("contentType", "utf8");  
12			            connection.setReadTimeout(5000);
13			            connection.setRequestProperty("accept", "*/*");
14			            connection.setRequestProperty("connection", "Keep-Alive");
15			            connection.setRequestProperty("user-agent",
16			                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
17			            // 建立实际的连接
18			            connection.connect();
19			            // 获取所有响应头字段
20			           // Map<String, List<String>> map = connection.getHeaderFields();
21			
22			      
23			            // 定义 BufferedReader输入流来读取URL的响应
24			            in = new BufferedReader(new InputStreamReader(
25			                    connection.getInputStream(),"UTF-8"));//防止乱码
26			            String line;
27			            while ((line = in.readLine()) != null) {
28			                result += line;
29			            }
30			        } catch (Exception e) {
31			            //System.out.println("发送GET请求出现异常！" + e);
32			            e.printStackTrace();
33			            result="";
34			        }
35			        // 使用finally块来关闭输入流
36			        finally {
37			            try {
38			                if (in != null) {
39			                    in.close();
40			                }
41			            } catch (Exception e2) {
42			                e2.printStackTrace();
43			            }
44			        }
45			       // System.out.println("123");
46			        
47			        return result;
48			}