java操作json的通用类
package com.baiyyy.polabs.util.json;import java.text.ParseException;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import com.baiyyy.polabs.util.DateUtil;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import net.sf.json.JsonConfig;import net.sf.json.util.CycleDetectionStrategy;/** * 处理json的工具类，负责json数据转换成java对象和java对象转换成json ** @author yongtree * @date 2008-11-22 上午10:47:13 * @version 1.0 */public class JsonUtil {/** * 从一个JSON 对象字符格式中得到一个java对象 ** @param jsonString * @param pojoCalss * @return */public static Object getObject4JsonString(String jsonString, Class pojoCalss) {Object pojo;JSONObject jsonObject = JSONObject.fromObject(jsonString);pojo = JSONObject.toBean(jsonObject, pojoCalss);return pojo;}/** * 从json HASH表达式中获取一个map，改map支持嵌套功能 ** @param jsonString * @return */public static Map getMap4Json(String jsonString) {JSONObject jsonObject = JSONObject.fromObject(jsonString);Iterator keyIter = jsonObject.keys();String key;Object value;Map valueMap = new HashMap();while (keyIter.hasNext()) {key = (String) keyIter.next();value = jsonObject.get(key);valueMap.put(key, value);}return valueMap;}/** * 从json数组中得到相应java数组 ** @param jsonString * @return */public static Object[] getObjectArray4Json(String jsonString) {JSONArray jsonArray = JSONArray.fromObject(jsonString);return jsonArray.toArray();}/** * 从json对象集合表达式中得到一个java对象列表 ** @param jsonString * @param pojoClass * @return */public static List getList4Json(String jsonString, Class pojoClass) {JSONArray jsonArray = JSONArray.fromObject(jsonString);JSONObject jsonObject;Object pojoValue;List list = new ArrayList();for (int i = 0; i < jsonArray.size(); i++) {jsonObject = jsonArray.getJSONObject(i);pojoValue = JSONObject.toBean(jsonObject, pojoClass);list.add(pojoValue);}return list;}/** * 从json数组中解析出java字符串数组 ** @param jsonString * @return */public static String[] getStringArray4Json(String jsonString) {JSONArray jsonArray = JSONArray.fromObject(jsonString);String[] stringArray = new String;for (int i = 0; i < jsonArray.size(); i++) {stringArray = jsonArray.getString(i);}return stringArray;}/** * 从json数组中解析出javaLong型对象数组 ** @param jsonString * @return */public static Long[] getLongArray4Json(String jsonString) {JSONArray jsonArray = JSONArray.fromObject(jsonString);Long[] longArray = new Long;for (int i = 0; i < jsonArray.size(); i++) {longArray = jsonArray.getLong(i);}return longArray;}/** * 从json数组中解析出java Integer型对象数组 ** @param jsonString * @return */public static Integer[] getIntegerArray4Json(String jsonString) {JSONArray jsonArray = JSONArray.fromObject(jsonString);Integer[] integerArray = new Integer;for (int i = 0; i < jsonArray.size(); i++) {integerArray = jsonArray.getInt(i);}return integerArray;}/** * 从json数组中解析出java Date 型对象数组，使用本方法必须保证 ** @param jsonString * @return * @throws ParseException */public static Date[] getDateArray4Json(String jsonString, String DataFormat)throws ParseException {JSONArray jsonArray = JSONArray.fromObject(jsonString);Date[] dateArray = new Date;String dateString;Date date;for (int i = 0; i < jsonArray.size(); i++) {dateString = jsonArray.getString(i);date = DateUtil.parseDate(dateString, DataFormat);dateArray = date;}return dateArray;}/** * 从json数组中解析出java Integer型对象数组 ** @param jsonString * @return */public static Double[] getDoubleArray4Json(String jsonString) {JSONArray jsonArray = JSONArray.fromObject(jsonString);Double[] doubleArray = new Double;for (int i = 0; i < jsonArray.size(); i++) {doubleArray = jsonArray.getDouble(i);}return doubleArray;}/** * 将java对象转换成json字符串 ** @param javaObj * @return */public static String getJsonString4JavaPOJO(Object javaObj) {JSONObject json;json = JSONObject.fromObject(javaObj);return json.toString();}/** * 将java对象转换成json字符串,并设定日期格式 ** @param javaObj * @param dataFormat * @return */public static String getJsonString4JavaPOJO(Object javaObj,String dataFormat) {JSONObject json;JsonConfig jsonConfig = configJson(dataFormat);json = JSONObject.fromObject(javaObj, jsonConfig);return json.toString();}/** * JSON 时间解析器具 ** @param datePattern * @return */public static JsonConfig configJson(String datePattern) {JsonConfig jsonConfig = new JsonConfig();jsonConfig.setExcludes(new String[] { "" });jsonConfig.setIgnoreDefaultExcludes(false);jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);jsonConfig.registerJsonValueProcessor(Date.class,new JsonDateValueProcessor(datePattern));return jsonConfig;}/** * 除去不想生成的字段（特别适合去掉级联的对象）+时间转换 * @param excludes 除去不想生成的字段 * @param datePattern * @return */public static JsonConfig configJson(String[] excludes, String datePattern) {JsonConfig jsonConfig = new JsonConfig();jsonConfig.setExcludes(excludes);jsonConfig.setIgnoreDefaultExcludes(true);jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);jsonConfig.registerJsonValueProcessor(Date.class,new JsonDateValueProcessor(datePattern));return jsonConfig;}}文章原址http://yongtree.iteye.com/blog/274087
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