一个java处理JSON格式数据的通用类
进入需要在项目中用java处理json格式的数据，因此封装了一个class，现将这个class共享出来和大家分享
/**
?* Copyright (c) linkwise 2007-2009 corporation.?
?* All rights reserved
?*/
package com.linghui.common.util;
?
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;
?
import com.linghui.common.util.DateUtil;
import com.linghui.common.util.jsonutil.DateJsonValueProcessor;
?
/**
?* @author robert.feng
?*
?*/
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
?*/
?public static Date[] getDateArray4Json(String jsonString,String DataFormat){?
?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.stringToDate(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();
??}
??
?/**
?* @param args
?*/
?public static void main(String[] args) {
?// TODO 自动生成方法存根
?}
?
?/**
?* 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 DateJsonValueProcessor(datePattern)); ?
?return jsonConfig;?
?}?
?
?/**
?*
?* @param excludes
?* @param datePattern
?* @return
?*/
?public static JsonConfig configJson(String[] excludes,?
?String datePattern) {?
?JsonConfig jsonConfig = new JsonConfig();?
?jsonConfig.setExcludes(excludes);?
?jsonConfig.setIgnoreDefaultExcludes(false);?
?jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);?
?jsonConfig.registerJsonValueProcessor(Date.class,?
?new DateJsonValueProcessor(datePattern)); ?
?return jsonConfig;?
?}?
}
?
/**
?* linkwise
?*/
package com.linghui.common.util.jsonutil;
?
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
?
import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;
?
/**
?* @author robert.feng
?*
?*/
public class DateJsonValueProcessor implements JsonValueProcessor {
?
?public static final String DEFAULT_DATE_PATTERN = "yyyy-MM-dd";?
?private DateFormat dateFormat;?
?
?/**?
?* 构造方法.?
?*?
?* @param datePattern 日期格式?
?*/?
?public DateJsonValueProcessor(String datePattern) { ?
?if( null == datePattern )
?dateFormat = new SimpleDateFormat(DEFAULT_DATE_PATTERN);?
?else
?dateFormat = new SimpleDateFormat(datePattern);
??}?
?
?
?/* （非 Javadoc）
?* @see net.sf.json.processors.JsonValueProcessor#processArrayValue(java.lang.Object, net.sf.json.JsonConfig)
?*/
?public Object processArrayValue(Object arg0, JsonConfig arg1) {
?// TODO 自动生成方法存根
?return process(arg0);?
?}
?
?/* （非 Javadoc）
?* @see net.sf.json.processors.JsonValueProcessor#processObjectValue(java.lang.String, java.lang.Object, net.sf.json.JsonConfig)
?*/
?public Object processObjectValue(String arg0, Object arg1, JsonConfig arg2) {
?// TODO 自动生成方法存根
?return process(arg1);?
?}?
?private Object process(Object value) {?
?return dateFormat.format((Date) value);?
?}??
}