缩短网站地址

2019独角兽企业重金招聘Python工程师标准>>>

http://www.alifeifei.net/

http://blog.sina.com.cn/s/blog_716b5a990102v1mi.html
http://blog.sina.com.cn/s/blog_15f27f8cf0102wno5.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 tokenat [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 blocke.printStackTrace();} catch (JsonMappingException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.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();  }  
}

转载于:https://my.oschina.net/yizhichao/blog/892226

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