对象(含有java.util.Date)，集合等转换成json

package A.test;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Locale;

import net.sf.json.JsonConfig;

import net.sf.json.processors.JsonValueProcessor;

public class JsonDateValueProcessor implements JsonValueProcessor {

private String format ="yyyy-MM-dd";

public Object processArrayValue(Object value, JsonConfig config) {

return process(value);

}

public Object processObjectValue(String key, Object value, JsonConfig config) {

return process(value);

}

private Object process(Object value){

if(value instanceof Date){

SimpleDateFormat sdf = new SimpleDateFormat(format,Locale.UK);

return sdf.format(value);

}

return value == null ? "" : value.toString();

}

}

2.测试类

package A.test;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import net.sf.json.JSON;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

import net.sf.json.JSONSerializer;

import net.sf.json.JsonConfig;

//转换时间格式后--需要commons-beanutils.jar,commons-collections-3.2.1.jar,commons-lang.jar,commons-logging-1.0.4.jar

//ezmorph-1.0.1.jar,json-lib-2.4-jdk15.jar

public class Json {

// 不转换时间

// public static void main(String[] args) {

// Student st = new Student();

// st.setName("张翠山");

// st.setTeacher("张三丰");

// st.setTime(new Date());

// JSON jo = JSONSerializer.toJSON(st);

// System.out.println("json:" + jo.toString());

// }

// 对象转换

// public static void main(String[] args) {

// Student st = new Student();

// st.setName("张翠山");

// st.setTeacher("张三丰");

// st.setTime(new Date());

//

// JsonConfig jsonConfig = new JsonConfig();

// //JsonConfig是net.sf.json.JsonConfig中的这个，为固定写法

// jsonConfig.registerJsonValueProcessor(Date.class , new

// JsonDateValueProcessor());

// JSONArray jo = JSONArray.fromObject(st, jsonConfig);

// System.out.println("json:" + jo.toString());

// }

// 集合转换

// public static void main(String[] args) {

// List<Object> list = new ArrayList<Object>();

// Date date = new Date();

// System.out.println(date);

// SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd:HH:mm:ss");

// String s= sdf.format(date);

// System.out.println(s);

// // try {

// // Date d = sdf.parse(s);

// // System.out.println(d);

// list.add(0,s);

// // } catch (ParseException e) {

// // TODO Auto-generated catch block

// // e.printStackTrace();

// // }

// list.add(1,"张三");

// list.add(2,2);

// list.add(3,"李四");

// list.add(4,date);

// JsonConfig jsonConfig = new JsonConfig();//JsonConfig是net.sf.json.JsonConfig中的这个，为固定写法

// jsonConfig.registerJsonValueProcessor(Date.class , new JsonDateValueProcessor());

// JSONArray jo = JSONArray.fromObject(list, jsonConfig);

// System.out.println("json:" + jo.toString());

// }

// 集合转换

public static void main(String[] args) {

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

Map<String, Object> s1 = new HashMap<String, Object>();

s1.put("name", "jim");

s1.put("age", "15");

s1.put("time", new Date());

list.add(s1);

Map<String, Object> s2 = new HashMap<String, Object>();

s2.put("name", "lucy");

s2.put("age", "12");

s2.put("time", new Date());

list.add(s2);

JsonConfig jsonConfig = new JsonConfig();

jsonConfig.registerJsonValueProcessor(Date.class , new JsonDateValueProcessor());

JSONArray jo = JSONArray.fromObject(list, jsonConfig);

System.out.println("json:" + jo.toString());

}

}

3.测试类中的实体类

package A.test;

import java.util.Date;

public class Student {

private String name;

private String teacher;

private Date time;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getTeacher() {

return teacher;

}

public void setTeacher(String teacher) {

this.teacher = teacher;

}

public Date getTime() {

return time;

}

public void setTime(Date time) {

this.time = time;

}

}