java处理json的工具类(list,map和json的之间的转换)

来源：互联网发布：淘宝仓库发货流程图编辑：程序博客网时间：2024/05/17 04:47
需要下载第三方的jar ：net.sf.json
import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.URL;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Set;import org.apache.commons.collections.map.ListOrderedMap;import net.sf.json.JSONArray;import net.sf.json.JSONObject;/** * * 处理json的工具类.* <br>本类为处理json的工具类* @author slj */public class JsonTools {    /**     *     * json转换list.    * <br>详细说明    * @param jsonStr json字符串    * @return    * @return List<Map<String,Object>> list    * @throws    * @author slj    * @date 2013年12月24日 下午1:08:03     */    public static List<Map<String, Object>> parseJSON2List(String jsonStr){        JSONArray jsonArr = JSONArray.fromObject(jsonStr);        List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();        Iterator<JSONObject> it = jsonArr.iterator();        while(it.hasNext()){            JSONObject json2 = it.next();            list.add(parseJSON2Map(json2.toString()));        }        return list;    }   /**    *    * json转换map.   * <br>详细说明   * @param jsonStr json字符串   * @return   * @return Map<String,Object> 集合   * @throws   * @author slj    */    public static Map<String, Object> parseJSON2Map(String jsonStr){        ListOrderedMap map = new ListOrderedMap();        //最外层解析        JSONObject json = JSONObject.fromObject(jsonStr);        for(Object k : json.keySet()){            Object v = json.get(k);             //如果内层还是数组的话，继续解析            if(v instanceof JSONArray){                List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();                Iterator<JSONObject> it = ((JSONArray)v).iterator();                while(it.hasNext()){                    JSONObject json2 = it.next();                    list.add(parseJSON2Map(json2.toString()));                }                map.put(k.toString(), list);            } else {                map.put(k.toString(), v);            }        }        return map;    }    /**     *     * 通过HTTP获取JSON数据.    * <br>通过HTTP获取JSON数据返回list    * @param url 链接    * @return    * @return List<Map<String,Object>> list    * @throws    * @author slj     */    public static List<Map<String, Object>> getListByUrl(String url){        try {            //通过HTTP获取JSON数据            InputStream in = new URL(url).openStream();            BufferedReader reader = new BufferedReader(new InputStreamReader(in));            StringBuilder sb = new StringBuilder();            String line;            while((line=reader.readLine())!=null){                sb.append(line);            }            return parseJSON2List(sb.toString());        } catch (Exception e) {            e.printStackTrace();        }        return null;    }   /**    *    * 通过HTTP获取JSON数据.   * <br>通过HTTP获取JSON数据返回map   * @param url 链接   * @return   * @return Map<String,Object> 集合   * @throws   * @author slj    */    public static Map<String, Object> getMapByUrl(String url){        try {            //通过HTTP获取JSON数据            InputStream in = new URL(url).openStream();            BufferedReader reader = new BufferedReader(new InputStreamReader(in));            StringBuilder sb = new StringBuilder();            String line;            while((line=reader.readLine())!=null){                sb.append(line);            }            return parseJSON2Map(sb.toString());        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    /**     *     * map转换json.    * <br>详细说明    * @param map 集合    * @return    * @return String json字符串    * @throws    * @author slj     */    public static String mapToJson(Map<String, String> map) {        Set<String> keys = map.keySet();        String key = "";        String value = "";        StringBuffer jsonBuffer = new StringBuffer();        jsonBuffer.append("{");        for (Iterator<String> it = keys.iterator(); it.hasNext();) {            key = (String) it.next();            value = map.get(key);            jsonBuffer.append(key + ":" +"\""+ value+"\"");            if (it.hasNext()) {                jsonBuffer.append(",");            }        }        jsonBuffer.append("}");        return jsonBuffer.toString();    }    //test    public static void main(String[] args) {        String url = "http://...";        List<Map<String,Object>> list = getListByUrl(url);        System.out.println(list);    }}
0 0