Java操作Json的工具类
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 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[jsonArray.size()];????????
??????? for (int i = 0; i < jsonArray.size(); i++) {????????
??????????? stringArray[i] = 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[jsonArray.size()];????????
??????? for (int i = 0; i < jsonArray.size(); i++) {????????
??????????? longArray[i] = 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[jsonArray.size()];????????
??????? for (int i = 0; i < jsonArray.size(); i++) {????????
??????????? integerArray[i] = 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[jsonArray.size()];????????
??????? String dateString;????????
??????? Date date;????????
???????
??????? for (int i = 0; i < jsonArray.size(); i++) {????????
??????????? dateString = jsonArray.getString(i);????????
??????????? date = DateUtil.parseDate(dateString, DataFormat);????????
??????????? dateArray[i] = 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[jsonArray.size()];????????
??????? for (int i = 0; i < jsonArray.size(); i++) {????????
??????????? doubleArray[i] = 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;????????
??? }????????
???????
}???
*******************************************************************************************
日期转换
*******************************************************************************************
package com.baiyyy.polabs.util.json;????????
???????
import java.text.SimpleDateFormat;????????
import java.util.Date;????????
???????
import net.sf.json.JsonConfig;????????
import net.sf.json.processors.JsonValueProcessor;????????
???????
/**?????
*??????
* @author yongtree?????
* @date 2008-11-22 上午10:54:19?????
* @version 1.0?????
*/???????
public class JsonDateValueProcessor implements JsonValueProcessor {???????????
??????????????
??? private String format = "yyyy-MM-dd HH:mm:ss";???????????
??????????
??? public JsonDateValueProcessor() {???????????
??????????
??? }???????????
??????????
??? public JsonDateValueProcessor(String format) {???????????
??????? this.format = format;???????????
??? }???????????
??????????
??? public Object processArrayValue(Object value, JsonConfig jsonConfig) {???????????
??????? String[] obj = {};???????????
??????? if (value instanceof Date[]) {???????????
??????????? SimpleDateFormat sf = new SimpleDateFormat(format);???????????
??????????? Date[] dates = (Date[]) value;???????????
??????????? obj = new String[dates.length];???????????
??????????? for (int i = 0; i < dates.length; i++) {???????????
??????????????? obj[i] = sf.format(dates[i]);???????????
??????????? }???????????
??????? }???????????
??????? return obj;???????????
??? }??????????? [color=green]
??????????
??? public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {???????????
??????? if (value instanceof Date) {???????????
??????????? String str = new SimpleDateFormat(format).format((Date) value);???????????
??????????? return str;???????????
??????? }???????????
??????? return value == null ? null : value.toString();???????????
??? }???????????
??????????
??? public String getFormat() {???????????
??????? return format;???????????
??? }???????????
??????????
??? public void setFormat(String format) {???????????
??????? this.format = format;???????????
??? }???????????
??????????
}???????
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