http://www.alifeifei.net/

http://blog.sina.com.cn/s/blog_716b5a990102v1mi.html

http://open.weibo.com/wiki/Short_url/shorten

public static void main(String[] args) {		Map
    
      hashMap = new HashMap<>();		String url = "http://appdownload.allcam.com.cn/";		hashMap.put("source", "3271760578");		hashMap.put("url_long",url.toString());		String urlJson = httpGetRequest("http://api.t.sina.com.cn/short_url/shorten.json",hashMap);		System.out.println(urlJson);	}
    

恰好碰到这个问题

[{"url_short":"http://t.cn/Raw9LVX","url_long":"http://appdownload.allcam.com.cn/","type":0}][2017-05-04 20:44:42,918][ERROR][com.allcam.andedu.abc.utils.JsonParseUtil.json2Obj(JsonParseUtil.java:97)][main] - JsonMappingException:Json Convert Object Error... - com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.allcam.andedu.abc.utils.UrlShortResp out of START_ARRAY token at [Source: [{"url_short":"http://t.cn/Raw9LVX","url_long":"http://appdownload.allcam.com.cn/","type":0}]; line: 1, column: 1]	at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)	at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:835)	at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:831)	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromArray(BeanDeserializerBase.java:1229)	at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:165)	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:144)	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3562)	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2578)	at com.allcam.andedu.abc.utils.JsonParseUtil.json2Obj(JsonParseUtil.java:89)	at com.allcam.andedu.abc.utils.ShortUrlUtils.main(ShortUrlUtils.java:14)null

修改代码	public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {		String url = "http://appdownload.allcam.com.cn/";		String urlJson = sendGet("http://api.t.sina.com.cn/short_url/shorten.json", "source=3271760578&url_long=" + url.toString());		System.out.println(urlJson);//		UrlShortResp resp = JsonParseUtil.json2Obj(urlJson, UrlShortResp.class);				ObjectMapper mapper = new ObjectMapper();  		UrlShortResp resp = mapper.readValue(urlJson, UrlShortResp[].class)[0];  		System.out.println(resp);	}

工具类

package com.allcam.andedu.abc.utils;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.URL;import java.net.URLConnection;import org.codehaus.jackson.JsonParseException;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;public class ShortUrlUtils {	public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {		String url = "http://appdownload.allcam.com.cn/";		String urlJson = sendGet("http://api.t.sina.com.cn/short_url/shorten.json", "source=3271760578&url_long=" + url.toString());		System.out.println(urlJson);//		UrlShortResp resp = JsonParseUtil.json2Obj(urlJson, UrlShortResp.class);				ObjectMapper mapper = new ObjectMapper();  		UrlShortResp resp = mapper.readValue(urlJson, UrlShortResp[].class)[0];  		System.out.println(resp);	}			public static String getShortUrl(String url)	{		UrlShortResp resp = null;		try {			String urlJson = sendGet("http://api.t.sina.com.cn/short_url/shorten.json", "source=3271760578&url_long=" + url.toString());			System.out.println(urlJson);			ObjectMapper mapper = new ObjectMapper();  			resp = mapper.readValue(urlJson, UrlShortResp[].class)[0];  			System.out.println(resp);		} catch (JsonParseException e) {			// TODO Auto-generated catch block			e.printStackTrace();		} catch (JsonMappingException e) {			// TODO Auto-generated catch block			e.printStackTrace();		} catch (IOException e) {			// TODO Auto-generated catch block			e.printStackTrace();		}		return resp.getUrl_short();	}		 /**      * 向指定URL发送GET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 URL 所代表远程资源的响应结果      */      /**      * @author 向蓬      * @date 2016-5-20上午10:31:11      * @param url      * @param param      * @return      * String      */      public static String sendGet(String url, String param) {          StringBuffer result = null;          BufferedReader in = null;          try {              String urlNameString = url + "?" + param;              URL realUrl = new URL(urlNameString);              // 打开和URL之间的连接              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)");              // 建立实际的连接              connection.connect();              // 定义 BufferedReader输入流来读取URL的响应              in = new BufferedReader(new InputStreamReader(                      connection.getInputStream()));              String line;              result = new StringBuffer();              while ((line = in.readLine()) != null) {                  result.append(line);              }          } catch (Exception e) {          } finally {              //释放资源              try {                  if (in != null) {                      in.close();                  }              } catch (Exception e) {              }          }          return result.toString();      }      //    /**  //     * URLConnection发送get请求  //     * @author 向蓬  //     * @date 2016-5-20上午10:39:25  //     * @param url  //     * @param param  //     * @return  //     * String  //     */  //    public static String httpGetRequest(String url, String param) {  //        StringBuffer result = null;  //        BufferedReader in = null;  //        try {  //            String urlNameString = url + "?" + param;  //            System.out.println("请求url："+urlNameString);  //            URL realUrl = new URL(urlNameString);  //            // 打开和URL之间的连接  //            URLConnection connection = realUrl.openConnection();  //            // 设置通用的请求属性  //            connection.setRequestProperty("accept", "application/json;charset=UTF-8");  //            connection.setRequestProperty("connection", "Keep-Alive");  //            connection.setRequestProperty("user-agent",  //                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");  //            // 建立实际的连接  //            connection.connect();  //            // 定义 BufferedReader输入流来读取URL的响应  //            in = new BufferedReader(new InputStreamReader(  //                    connection.getInputStream()));  //            String line;  //            result = new StringBuffer();  //            while ((line = in.readLine()) != null) {  //                result.append(line);  //            }  //        } catch (Exception e) {  //        } finally {  //            //释放资源  //            try {  //                if (in != null) {  //                    in.close();  //                }  //            } catch (Exception e) {  //            }  //        }  //        return result.toString();  //    }            /**       * URLConnection发送get请求       * @author 向蓬       * @date 2016-5-20上午10:39:25       * @param url       * @param param       * @return       * String       */      public static String httpGetRequest(String url, String param) {          StringBuffer result = null;          BufferedReader in = null;          try {              String urlNameString = url + "?" + param;              System.out.println("请求url："+urlNameString);              URL realUrl = new URL(urlNameString);              // 打开和URL之间的连接              URLConnection connection = realUrl.openConnection();              // 设置通用的请求属性              connection.setRequestProperty("accept", "application/json;charset=UTF-8");              connection.setRequestProperty("connection", "Keep-Alive");              connection.setRequestProperty("user-agent",                      "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");              // 建立实际的连接              connection.connect();              // 定义 BufferedReader输入流来读取URL的响应              in = new BufferedReader(new InputStreamReader(                      connection.getInputStream()));              String line;              result = new StringBuffer();              while ((line = in.readLine()) != null) {                  result.append(line);              }          } catch (Exception e) {          } finally {              //释放资源              try {                  if (in != null) {                      in.close();                  }              } catch (Exception e) {              }          }          return result.toString();      }  }