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 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);
}
}
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