java解析json

 java解析json

 DTO：Data Transfer Object，数据传送对象。
 json-lib-2.4-jdk15.jar依赖commons-beanutils-1.8.3.jar  |commons-collections-3.2.1.jar  |commons-lang-2.6.jar  |commons-logging-1.1.1.jar |ezmorph-1.0.6.jar

package util;import java.util.ArrayList;import java.util.Collection;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import net.sf.ezmorph.object.DateMorpher;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import net.sf.json.JsonConfig;import net.sf.json.util.JSONUtils;/** * @author zengfh * DTO：Data Transfer Object，数据传送对象 * json-lib-2.4-jdk15.jar依赖 * commons-beanutils-1.8.3.jar * |commons-collections-3.2.1.jar * |commons-lang-2.6.jar * |commons-logging-1.1.1.jar * |ezmorph-1.0.6.jar */public class JsonUtil {/** 页面传至后台时，json数据在request的参数名称 */public final static String JSON_ATTRIBUTE = "json";public final static String JSON_ATTRIBUTE1 = "json1";public final static String JSON_ATTRIBUTE2 = "json2";public final static String JSON_ATTRIBUTE3 = "json3";public final static String JSON_ATTRIBUTE4 = "json4";/** * 从一个JSON 对象字符格式中得到一个java对象，形如： {"id" : idValue, "name" : nameValue, * "aBean" : {"aBeanId" : aBeanIdValue, ...}} *  * @param object * @param clazz * @return */public static Object getDTO(String jsonString, Class<?> clazz) {JSONObject jsonObject = null;try {setDataFormat2JAVA();jsonObject = JSONObject.fromObject(jsonString);} catch (Exception e) {e.printStackTrace();}return JSONObject.toBean(jsonObject, clazz);}/** * 从一个JSON 对象字符格式中得到一个java对象，其中beansList是一类的集合，形如： {"id" : idValue, "name" : * nameValue, "aBean" : {"aBeanId" : aBeanIdValue, ...}, beansList:[{}, {}, * ...]} *  * @param jsonString * @param clazz * @param map *            集合属性的类型 (key : 集合属性名, value : 集合属性类型class) eg: ("beansList" : *            Bean.class) * @return */public static Object getDTO(String jsonString, Class<?> clazz, Map<?, ?> map) {JSONObject jsonObject = null;try {setDataFormat2JAVA();jsonObject = JSONObject.fromObject(jsonString);} catch (Exception e) {e.printStackTrace();}return JSONObject.toBean(jsonObject, clazz, map);}/** * 从一个JSON数组得到一个java对象数组，形如： [{"id" : idValue, "name" : nameValue}, {"id" : * idValue, "name" : nameValue}, ...] *  * @param object * @param clazz * @return */public static Object[] getDTOArray(String jsonString, Class<?> clazz) {setDataFormat2JAVA();JSONArray array = JSONArray.fromObject(jsonString);Object[] obj = new Object[array.size()];for (int i = 0; i < array.size(); i++) {JSONObject jsonObject = array.getJSONObject(i);obj[i] = JSONObject.toBean(jsonObject, clazz);}return obj;}/** * 从一个JSON数组得到一个java对象数组，形如： [{"id" : idValue, "name" : nameValue}, {"id" : * idValue, "name" : nameValue}, ...] *  * @param object * @param clazz * @param map * @return */public static Object[] getDTOArray(String jsonString, Class<?> clazz, Map<?, ?> map) {setDataFormat2JAVA();JSONArray array = JSONArray.fromObject(jsonString);Object[] obj = new Object[array.size()];for (int i = 0; i < array.size(); i++) {JSONObject jsonObject = array.getJSONObject(i);obj[i] = JSONObject.toBean(jsonObject, clazz, map);}return obj;}/** * 从一个JSON数组得到一个java对象集合 *  * @param object * @param clazz * @return */public static List<Object> getDTOList(String jsonString, Class<?> clazz) {setDataFormat2JAVA();JSONArray array = JSONArray.fromObject(jsonString);List<Object> list = new ArrayList<Object>();for (Iterator<?> iter = array.iterator(); iter.hasNext();) {JSONObject jsonObject = (JSONObject) iter.next();list.add(JSONObject.toBean(jsonObject, clazz));}return list;}/** * 从一个JSON数组得到一个java对象集合，其中对象中包含有集合属性 *  * @param object * @param clazz * @param map *            集合属性的类型 * @return */public static List<Object> getDTOList(String jsonString, Class<?> clazz, Map<?, ?> map) {setDataFormat2JAVA();JSONArray array = JSONArray.fromObject(jsonString);List<Object> list = new ArrayList<Object>();for (Iterator<?> iter = array.iterator(); iter.hasNext();) {JSONObject jsonObject = (JSONObject) iter.next();list.add(JSONObject.toBean(jsonObject, clazz, map));}return list;}/** * 从json HASH表达式中获取一个map，该map支持嵌套功能 形如：{"id" : "johncon", "name" : "小强"} * 注意commons-collections版本，必须包含org.apache.commons.collections.map.MultiKeyMap *  * @param object * @return */public static Map<String, Object> getMapFromJson(String jsonString) {setDataFormat2JAVA();JSONObject jsonObject = JSONObject.fromObject(jsonString);Map<String, Object> map = new HashMap<String, Object>();for (Iterator<?> iter = jsonObject.keys(); iter.hasNext();) {String key = (String) iter.next();map.put(key, jsonObject.get(key));}return map;}/** * 从json数组中得到相应java数组 json形如：["123", "456"] *  * @param jsonString * @return */public static Object[] getObjectArrayFromJson(String jsonString) {JSONArray jsonArray = JSONArray.fromObject(jsonString);return jsonArray.toArray();}/** * 把数据对象转换成json字符串 DTO对象形如：{"id" : idValue, "name" : nameValue, ...} * 数组对象形如：[{}, {}, {}, ...] map对象形如：{key1 : {"id" : idValue, "name" : * nameValue, ...}, key2 : {}, ...} *  * @param object * @return */public static String getJSONString(Object object) throws Exception {String jsonString = null;// 日期值处理器JsonConfig jsonConfig = new JsonConfig();jsonConfig.registerJsonValueProcessor(java.util.Date.class,new JsonDateValueProcessor());if (object != null) {if (object instanceof Collection || object instanceof Object[]) {jsonString = JSONArray.fromObject(object, jsonConfig).toString();} else {jsonString = JSONObject.fromObject(object, jsonConfig).toString();}}return jsonString == null ? "{}" : jsonString;}private static void setDataFormat2JAVA() {// 设定日期转换格式JSONUtils.getMorpherRegistry().registerMorpher(new DateMorpher(new String[] { "yyyy-MM-dd","yyyy-MM-dd HH:mm:ss" }));}public static void main(String[] arg) throws Exception {String s = "{status : 'success'}";System.out.println(" object : " + JsonUtil.getJSONString(s));}}