调用第三方接口生成短链接（三）

package space;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class TestWeibo {

	static String actionUrl = "http://api.t.sina.com.cn/short_url/shorten.json";
	static String APPKEY = "2815391962,31641035,3271760578,3925598208";
	public static void main(String[] args) {
		String longUrl = "https://www.baidu.com";
		TestWeibo tw = new TestWeibo();
		System.out.println(tw.sinaShortUrl(longUrl));
	}

	public String sinaShortUrl(String longUrl){
		longUrl = java.net.URLEncoder.encode(longUrl);
		String appkey = APPKEY;
		String[] sourceArray = appkey.split(",");
		for(String key:sourceArray){
			String shortUrl = sinaShortUrl(key,longUrl);
			if(shortUrl != null){
				return shortUrl;
			}
		}
		return null;
	}
	
	public String sinaShortUrl(String source, String longUrl){
		String result = sendPost(actionUrl, "url_long="+longUrl+"&source="+source);
		if(result==null || "".equals(result)){
			return "";
		}
		JSONArray jsonArr = JSON.parseArray(result);
		JSONObject json = JSON.parseObject(jsonArr.get(0).toString());
		String ret = json.get("url_short").toString();
	    return ret;
	}	
	
	/**
     * 向指定 URL 发送POST方法的请求
     * @param url 发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    
	
}