处理格式数据的通用类

java处理JSON格式数据的通用类-每天进步一点点-我的搜狐一个java处理JSON格式数据的通用类分类：JSON2013-04-27 18:00 阅读(19)评论(0)原始的json方法response.setContentType("text/html;charset=UTF-8");response.setHeader("Cache-Control","no-cache");JSONObject json = new JSONObject();//用于存放最后返回的json变量JSONArray jsonal = new JSONArray();//用于存放json的列表JSONObject jsonobj = new JSONObject();//用于存放列表中的单条数据try{for(int i=0;i<10;i++){//把列表中的每一列的每个值赋给jsonobjjsonobj.put("id", "编号");jsonobj.put("title", "标题");jsonobj.put("author", "作者");jsonobj.put("time", "时间");//把已经赋值过的jsonobj（即单条数据）放到列表里jsonal.add(jsonobj);}json.put("list", jsonal);//把这个列表放到json里面用于最后返回输出}catch(Exception e){e.printStackTrace();}response.getWriter().write(json.toString());//把json值输出返回到页面上这里是字符串的形式我前台是用js接收来解析的别人写的工具类：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 mon.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 mon.util.DateUtil;import mon.util.jsonutil.DateJsonValueProcessor;/*** @author </br> <a href="mailto:"> robert.feng</a>**/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*/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*/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 dataFo rmat){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.LENIEN T);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.LENIEN T);jsonConfig.registerJsonValueProcessor(Date.class,new DateJsonValueProcessor(datePattern));return jsonConfig;}}/*** linkwise*/package mon.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 </br> <a href="mailto:"> robert.feng</a>**/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); elsedateFormat = new SimpleDateFormat(datePattern);}/* （非 Javadoc）* @see net.sf.json.processors.JsonValueProcessor#processArrayValue(jav ng.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(ja ng.String, ng.Object, net.sf.json.JsonConfig)*/public Object processObjectValue(String arg0, Object arg1, JsonConfig arg 2) {// TODO 自动生成方法存根return process(arg1);}private Object process(Object value) {return dateFormat.format((Date) value);}}11 / 1111 / 11。