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：
package com.yoodb.util; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpException; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.httpclient.params.HttpMethodParams; public class HttpConnectUtil { private static String DUOSHUO_SHORTNAME = "yoodb";//多说短域名 ****.yoodb.**** private static String DUOSHUO_SECRET = "xxxxxxxxxxxxxxxxx";//多说秘钥 /**
*
* @Title:getToken
* @Description:(get方式调用http接口获取token)
* @param url
* @return
* @throws Exception
* @author zzq
*/ public static String getToken(String url) throws Exception { String responseMsg = ""; String access_token = ""; HttpClient httpClient = new HttpClient(); GetMethod getMethod = new GetMethod(url); getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler()); try { httpClient.executeMethod(getMethod); ByteArrayOutputStream out = new ByteArrayOutputStream(); InputStream in = getMethod.getResponseBodyAsStream(); int len = 0; byte[] buf = new byte[1024]; while ((len = in.read(buf)) != -1) { out.write(buf, 0, len); } responseMsg = out.toString("UTF-8"); JSONObject obj = JSONObject.fromObject(responseMsg); System.out.print(obj); access_token = obj.getString("access_token"); } catch (HttpException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { getMethod.releaseConnection();// 释放连接 } return access_token; } /** * post方式 * @param url * @param code * @param type * @author www.yoodb.com * @return */ public static String postHttp(String url,String code,String type) { String responseMsg = ""; HttpClient httpClient = new HttpClient(); httpClient.getParams().setContentCharset("GBK"); PostMethod postMethod = new PostMethod(url); postMethod.addParameter(type, code); postMethod.addParameter("client_id", DUOSHUO_SHORTNAME); postMethod.addParameter("client_secret", DUOSHUO_SECRET); try { httpClient.executeMethod(postMethod); ByteArrayOutputStream out = new ByteArrayOutputStream(); InputStream in = postMethod.getResponseBodyAsStream(); int len = 0; byte[] buf = new byte[1024]; while((len=in.read(buf))!=-1){ out.write(buf, 0, len); } responseMsg = out.toString("UTF-8"); } catch (HttpException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { postMethod.releaseConnection(); } return responseMsg; } }
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：
public Map<String, String> getUserToken(String code){ String url = "http://api.duoshuo.com/oauth2/access_token"; String response = HttpConnectUtil.postHttp(url, code, "code"); System.out.println(response); Gson gson = new Gson(); Map<String, String> retMap = gson.fromJson(response,new TypeToken<Map<String, String>>() {}.getType()); return retMap; }
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：
public Map getProfiletMap(String userId){ String url = "http://api.duoshuo.com/users/profile.json?user_id="+userId; String response = HttpConnectUtil.getHttp(url); response = response.replaceAll("\\", ""); System.out.println(response); Gson gson = new Gson(); Map profile = gson.fromJson(response, Map.class); return profile; }
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：
{
"response": {
"user_id": "13504206",
"name": "伤了心",
"url": "http://t.qq.com/wdg1115024292",
"avatar_url": "http://q.qlogo.cn/qqapp/100229475/F007A1729D7BCC84C106D6E4F2ECC936/100",
"threads": 0,
"comments": 0,
"social_uid": {
"qq": "F007A1729D7BCC84C106D6E4F2ECC936"
},
"post_votes": "0",
"connected_services": {
"qqt": {
"name": "伤了心",
"email": null,
"avatar_url": "http://app.qlogo.cn/mbloghead/8a59ee1565781d099f3a/50",
"url": "http://t.qq.com/wdg1115024292",
"description": "没劲",
"service_name": "qqt"
},
"qzone": {
"name": "?郁闷小佈?",
"avatar_url": "http://q.qlogo.cn/qqapp/100229475/F007A1729D7BCC84C106D6E4F2ECC936/100",
"service_name": "qzone"
}
}
},
"code": 0
}
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。