java处理json的工具类(list,map和json的之间的转换)

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.* 本类为处理json的工具类* @author slj */{/**** json转换list.* 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. * 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.* 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. * 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.* 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();}(String[] args) {String url = “http://…”;List<Map<String,Object>> list = getListByUrl(url);System.out.println(list);}}

相反，某天也许你会忽然发现，心早已沦陷。

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