日期:2014-05-16  浏览次数:20378 次

java处理json通用类

/**

  * 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 sta