解决JSON解析错误-优快云博客

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<String, String> 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();  
    }  
}

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