public class Person { private String name; private Date birthday; public void setName(String name) { this.name = name; } public String getName() { return name; } public void setBirthday(Date birthday) { this.birthday = birthday; } public Date getBirthday() { return birthday; } }
import java.util.ArrayList;import java.util.Collection;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import net.sf.ezmorph.object.DateMorpher;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import net.sf.json.JsonConfig;import net.sf.json.util.JSONUtils;/** * @author <a href="mailto:wang-yu@msn.com">WangYu</a></br> * @version 1.0 <br> * @since JDK 1.6.0.12 <br> */public class JsonUtil { /**页面传至后台时，json数据在request的参数名称*/ public final static String JSON_ATTRIBUTE = "json"; public final static String JSON_ATTRIBUTE1 = "json1"; public final static String JSON_ATTRIBUTE2 = "json2"; public final static String JSON_ATTRIBUTE3 = "json3"; public final static String JSON_ATTRIBUTE4 = "json4"; /** * 从一个JSON 对象字符格式中得到一个java对象，形如： * {"id" : idValue, "name" : nameValue, "aBean" : {"aBeanId" : aBeanIdValue, ...}} * @param object * @param clazz * @return */ public static Object getDTO(String jsonString, Class clazz){ JSONObject jsonObject = null; try{ setDataFormat2JAVA(); jsonObject = JSONObject.fromObject(jsonString); }catch(Exception e){ e.printStackTrace(); } return JSONObject.toBean(jsonObject, clazz); } /** * 从一个JSON 对象字符格式中得到一个java对象，其中beansList是一类的集合，形如： * {"id" : idValue, "name" : nameValue, "aBean" : {"aBeanId" : aBeanIdValue, ...}, * beansList:[{}, {}, ...]} * @param jsonString * @param clazz * @param map 集合属性的类型 (key : 集合属性名, value : 集合属性类型class) eg: ("beansList" : Bean.class) * @return */ public static Object getDTO(String jsonString, Class clazz, Map map){ JSONObject jsonObject = null; try{ setDataFormat2JAVA(); jsonObject = JSONObject.fromObject(jsonString); }catch(Exception e){ e.printStackTrace(); } return JSONObject.toBean(jsonObject, clazz, map); } /** * 从一个JSON数组得到一个java对象数组，形如： * [{"id" : idValue, "name" : nameValue}, {"id" : idValue, "name" : nameValue}, ...] * @param object * @param clazz * @return */ public static Object[] getDTOArray(String jsonString, Class clazz){ setDataFormat2JAVA(); JSONArray array = JSONArray.fromObject(jsonString); Object[] obj = new Object[array.size()]; for(int i = 0; i < array.size(); i++){ JSONObject jsonObject = array.getJSONObject(i); obj[i] = JSONObject.toBean(jsonObject, clazz); } return obj; } /** * 从一个JSON数组得到一个java对象数组，形如： * [{"id" : idValue, "name" : nameValue}, {"id" : idValue, "name" : nameValue}, ...] * @param object * @param clazz * @param map * @return */ public static Object[] getDTOArray(String jsonString, Class clazz, Map map){ setDataFormat2JAVA(); JSONArray array = JSONArray.fromObject(jsonString); Object[] obj = new Object[array.size()]; for(int i = 0; i < array.size(); i++){ JSONObject jsonObject = array.getJSONObject(i); obj[i] = JSONObject.toBean(jsonObject, clazz, map); } return obj; } /** * 从一个JSON数组得到一个java对象集合 * @param object * @param clazz * @return */ public static List getDTOList(String jsonString, Class clazz){ setDataFormat2JAVA(); JSONArray array = JSONArray.fromObject(jsonString); List list = new ArrayList(); for(Iterator iter = array.iterator(); iter.hasNext();){ JSONObject jsonObject = (JSONObject)iter.next(); list.add(JSONObject.toBean(jsonObject, clazz)); } return list; } /** * 从一个JSON数组得到一个java对象集合，其中对象中包含有集合属性 * @param object * @param clazz * @param map 集合属性的类型 * @return */ public static List getDTOList(String jsonString, Class clazz, Map map){ setDataFormat2JAVA(); JSONArray array = JSONArray.fromObject(jsonString); List list = new ArrayList(); for(Iterator iter = array.iterator(); iter.hasNext();){ JSONObject jsonObject = (JSONObject)iter.next(); list.add(JSONObject.toBean(jsonObject, clazz, map)); } return list; } /** * 从json HASH表达式中获取一个map，该map支持嵌套功能 * 形如：{"id" : "johncon", "name" : "小强"} * 注意commons-collections版本，必须包含org.apache.commons.collections.map.MultiKeyMap * @param object * @return */ public static Map getMapFromJson(String jsonString) { setDataFormat2JAVA(); JSONObject jsonObject = JSONObject.fromObject(jsonString); Map map = new HashMap(); for(Iterator iter = jsonObject.keys(); iter.hasNext();){ String key = (String)iter.next(); map.put(key, jsonObject.get(key)); } return map; } /** * 从json数组中得到相应java数组 * json形如：["123", "456"] * @param jsonString * @return */ public static Object[] getObjectArrayFromJson(String jsonString) { JSONArray jsonArray = JSONArray.fromObject(jsonString); return jsonArray.toArray(); } /** * 把数据对象转换成json字符串 * DTO对象形如：{"id" : idValue, "name" : nameValue, ...} * 数组对象形如：[{}, {}, {}, ...] * map对象形如：{key1 : {"id" : idValue, "name" : nameValue, ...}, key2 : {}, ...} * @param object * @return */ public static String getJSONString(Object object) throws Exception{ String jsonString = null; //日期值处理器 JsonConfig jsonConfig = new JsonConfig(); jsonConfig.registerJsonValueProcessor(java.util.Date.class, new DateJsonValueProcessor()); if(object != null){ if(object instanceof Collection || object instanceof Object[]){ jsonString = JSONArray.fromObject(object, jsonConfig).toString(); }else{ jsonString = JSONObject.fromObject(object, jsonConfig).toString(); } } return jsonString == null ? "{}" : jsonString; } private static void setDataFormat2JAVA(){ //设定日期转换格式 JSONUtils.getMorpherRegistry().registerMorpher(new DateMorpher(new String[] {"yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss"})); }}
public class Test { public static void main(String[] args) { String personData = "{\"birthday\":\"1980/01/01\",\"name\":\"testname\"}"; JSONObject jsonPerson = JSONObject.fromObject(personData); String[] dateFormats = new String[] {"yyyy/MM/dd"}; JSONUtils.getMorpherRegistry().registerMorpher(new DateMorpher(dateFormats)); Person person = (Person)JSONObject.toBean(jsonPerson, Person.class); System.out.println(person.getBirthday()); }}
