Java操作json的通用类

1、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

2、;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 getObject4Js

3、onString(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) J

4、SONObject 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jav

5、a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(Strin

6、g 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

7、(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 StringjsonArray.size(); for (int i = 0; i jsonArray.size(); i+) stringArra

8、yi = 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 LongjsonArray.size(); for (int i = 0; i jsonArray.size(

9、); i+) longArrayi = 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 IntegerjsonArray.size(); for

10、 (int i = 0; i jsonArray.size(); i+) integerArrayi = 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

11、 jsonArray = JSONArray.fromObject(jsonString); Date dateArray = new DatejsonArray.size(); String dateString; Date date; for (int i = 0; i jsonArray.size(); i+) dateString = jsonArray.getString(i); date = DateUtil.parseDate(dateString, DataFormat); dateArrayi = date; return dateArray; /* * 从json数组中解析

12、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 DoublejsonArray.size(); for (int i = 0; i jsonArray.size(); i+) doubleArrayi = jsonArray.getDouble(i); retu

13、rn 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 stat

14、ic 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(Strin

15、g datePattern) JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setExcludes(new String ); jsonConfig.setIgnoreDefaultExcludes(false); jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT); jsonConfig.registerJsonValueProcessor(Date.class, new JsonDateValueProcessor(datePattern); r

16、eturn 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)

17、; 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.jso

18、n.JsonConfig; import cessors.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 proce