HTTP是一个客户端和服务器端请求和应答的标准（TCP），客户端是终端用户，服务器端是网站。通过使用Web浏览器、网络爬虫或者其它的工具，客户端发起一个到服务器上指定端口（默认端口为80）的HTTP请求。
具体POST或GET实现代码如下：
1package com.yoodb.util; 2 3import java.io.ByteArrayOutputStream; 4import java.io.IOException; 5import java.io.InputStream; 6 7import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler; 8import org.apache.commons.httpclient.HttpClient; 9import org.apache.commons.httpclient.HttpException; 10import org.apache.commons.httpclient.methods.GetMethod; 11import org.apache.commons.httpclient.methods.PostMethod; 12import org.apache.commons.httpclient.params.HttpMethodParams; 13 14public class HttpConnectUtil { 15 16 private static String DUOSHUO_SHORTNAME = "yoodb";//多说短域名 ****.yoodb.**** 17 private static String DUOSHUO_SECRET = "xxxxxxxxxxxxxxxxx";//多说秘钥 18 19 /** 20 * get方式 21 * @param url 22 * @author www.yoodb.com 23 * @return 24 */ 25 public static String getHttp(String url) { 26 String responseMsg = ""; 27 HttpClient httpClient = new HttpClient(); 28 GetMethod getMethod = new GetMethod(url); 29 getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,new DefaultHttpMethodRetryHandler()); 30 try { 31 httpClient.executeMethod(getMethod); 32 ByteArrayOutputStream out = new ByteArrayOutputStream(); 33 InputStream in = getMethod.getResponseBodyAsStream(); 34 int len = 0; 35 byte[] buf = new byte[1024]; 36 while((len=in.read(buf))!=-1){ 37 out.write(buf, 0, len); 38 } 39 responseMsg = out.toString("UTF-8"); 40 } catch (HttpException e) { 41 e.printStackTrace(); 42 } catch (IOException e) { 43 e.printStackTrace(); 44 } finally { 45 //释放连接 46 getMethod.releaseConnection(); 47 } 48 return responseMsg; 49 } 50 51 /** 52 * post方式 53 * @param url 54 * @param code 55 * @param type 56 * @author www.yoodb.com 57 * @return 58 */ 59 public static String postHttp(String url,String code,String type) { 60 String responseMsg = ""; 61 HttpClient httpClient = new HttpClient(); 62 httpClient.getParams().setContentCharset("GBK"); 63 PostMethod postMethod = new PostMethod(url); 64 postMethod.addParameter(type, code); 65 postMethod.addParameter("client_id", DUOSHUO_SHORTNAME); 66 postMethod.addParameter("client_secret", DUOSHUO_SECRET); 67 try { 68 httpClient.executeMethod(postMethod); 69 ByteArrayOutputStream out = new ByteArrayOutputStream(); 70 InputStream in = postMethod.getResponseBodyAsStream(); 71 int len = 0; 72 byte[] buf = new byte[1024]; 73 while((len=in.read(buf))!=-1){ 74 out.write(buf, 0, len); 75 } 76 responseMsg = out.toString("UTF-8"); 77 } catch (HttpException e) { 78 e.printStackTrace(); 79 } catch (IOException e) { 80 e.printStackTrace(); 81 } finally { 82 postMethod.releaseConnection(); 83 } 84 return responseMsg; 85 } 86}
1、下面说一下多说单点登录（SSO）获取access_token访问多说API的凭证。
多说单点登录（SSO），授权结束后跳转回在sso中设置的login地址，注意这时候的URL带上了code参数，通过code获取access_token访问多说API的凭证，具体实现代码如下：
1public Map<String, String> getUserToken(String code){ 2 String url = "http://api.duoshuo.com/oauth2/access_token"; 3 String response = HttpConnectUtil.postHttp(url, code, "code"); 4 System.out.println(response); 5 Gson gson = new Gson(); 6 Map<String, String> retMap = gson.fromJson(response,new TypeToken<Map<String, String>>() {}.getType()); 7 return retMap; 8}
返回参数是一个JSON串，包含user_id和access_token，user_id是该用户在多说的ID，access_token是访问多说API的凭证，处理成Map集合方便使用。
2、如果获取多说的用户信息，根据上一步获得的多说用户user_id来获取用户的具体信息，详情代码如下：
1public Map getProfiletMap(String userId){ 2 String url = "http://api.duoshuo.com/users/profile.json?user_id="+userId; 3 String response = HttpConnectUtil.getHttp(url); 4 response = response.replaceAll("\\\\", ""); 5 System.out.println(response); 6 Gson gson = new Gson(); 7 Map profile = gson.fromJson(response, Map.class); 8 return profile; 9}
上述使用了Google处理json数据的jar，如果对Gson处理json数据的方式不很了解，参考地址：http://www.yoodb.com/article/display/1033
返回的数据格式如下：
1{ 2 "response": { 3 "user_id": "13504206", 4 "name": "伤了心", 5 "url": "http://t.qq.com/wdg1115024292", 6 "avatar_url": "http://q.qlogo.cn/qqapp/100229475/F007A1729D7BCC84C106D6E4F2ECC936/100", 7 "threads": 0, 8 "comments": 0, 9 "social_uid": { 10 "qq": "F007A1729D7BCC84C106D6E4F2ECC936" 11 }, 12 "post_votes": "0", 13 "connected_services": { 14 "qqt": { 15 "name": "伤了心", 16 "email": null, 17 "avatar_url": "http://app.qlogo.cn/mbloghead/8a59ee1565781d099f3a/50", 18 "url": "http://t.qq.com/wdg1115024292", 19 "description": "没劲", 20 "service_name": "qqt" 21 }, 22 "qzone": { 23 "name": "?郁闷小佈?", 24 "avatar_url": "http://q.qlogo.cn/qqapp/100229475/F007A1729D7BCC84C106D6E4F2ECC936/100", 25 "service_name": "qzone" 26 } 27 } 28 }, 29 "code": 0 30}
获取的用户信息不方便查看，建议格式化一下，Json校验或格式化地址：http://www.yoodb.com/toJson，返回数据参数说明：
code int 一定返回
结果码。0为成功。失败时为错误码。
errorMessage strin
错误消息。当code不为0时，返回错误消息。
response object
json对象。当code为0时，返回请求到的json对象。