1. 把java 对象列表转换为json对象数组，并转为字符串
复制代码 代码如下:
JSONArray array = JSONArray.fromObject(userlist);
String jsonstr = array.toString();
2.把java对象转换成json对象，并转化为字符串
复制代码 代码如下:
JSONObject object = JSONObject.fromObject(invite);
String str=object.toString());
3.把JSON字符串转换为JAVA 对象数组
复制代码 代码如下:
String personstr = getRequest().getParameter("persons");
JSONArray json = JSONArray.fromObject(personstr);
List<InvoidPerson> persons = (List<InvoidPerson>)JSONArray.toCollection(json, nvoidPerson.class);
4.把JSON字符串转换为JAVA 对象
复制代码 代码如下:
JSONObject jsonobject = JSONObject.fromObject(str);
PassportLendsEntity passportlends = null;
try {
//获取一个json数组
JSONArray array = jsonobject.getJSONArray("passports");
//将json数组 转换成 List<PassPortForLendsEntity>泛型
List<PassPortForLendsEntity> list = new ArrayList<PassPortForLendsEntity>();
for (int i = 0; i < array.size(); i++) {
JSONObject object = (JSONObject)array.get(i);
PassPortForLendsEntity passport = (PassPortForLendsEntity)JSONObject.toBean(object,
PassPortForLendsEntity.class);
if(passport != null){
list.add(passport);
}
}
//转换PassportLendsEntity 实体类
passportlends = (PassportLendsEntity)JSONObject.toBean(jsonobject, PassportLendsEntity.class);
str = "{\"lendperson\":\"李四\",\"lendcompany\":\"有限公司\",\"checkperson\":\"李四\",
\"lenddate\":\"2010-07-19T00:00:00\",\"lendcounts\":4,\"
passports\":[{\"passportid\":\"d\",\"name\":\"李豫川\",\"passporttype\":\"K\"},
{\"passportid\":\"K9051\",\"name\":\"李平\",\"passporttype\":\"K\"},
{\"passportid\":\"K90517\",\"name\":\"袁寒梅\",\"passporttype\":\"K\"},
{\"passportid\":\"K905199\",\"name\":\"贺明\",\"passporttype\":\"K\"}]}";
------------------------------------------------------自己动手写的代码------------------------------------------------------------
package com.springDemo.animal;
/**
* @ClassName: Cat
* @Description: 测试用的实体类
* @Author：huangshijie
* @CreateDate：2015年1月15日 上午10:53:30
* @Modifior：
* @ModifyDate：
* @ModifyNotes：
*/
public class Cat {
private String name;
private String sex;
private String color;
public Cat(){}
public Cat(String name,String sex,String color){
this.name = name;
this.sex =sex;
this.color = color;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
}
package com.springDemo.animal;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import net.sf.json.JSONArray;
/**
* @ClassName: EntityFromJSON
* @Description: 从JSON转成实体类的ArrayList
* @Author：huangshijie
* @CreateDate：2015年1月15日 上午10:52:53
* @Modifior：
* @ModifyDate：
* @ModifyNotes：
*/
public class EntityFromJSON {
public static void main(String[] args){
Cat cat1 = new Cat("cat1","male","black");
Cat cat2 = new Cat("cat2","female","white");
Cat cat3 = new Cat("cat3","male","grey");
Cat cat4 = new Cat("cat4","female","black");
ArrayList<Cat> catList = new ArrayList<Cat>();
catList.add(cat1);
catList.add(cat2);
catList.add(cat3);
catList.add(cat4);
JSONArray jsonArray = JSONArray.fromObject(catList);
@SuppressWarnings("unchecked")
List<Cat> catList2 = (List<Cat>)JSONArray.toCollection(jsonArray, Cat.class);
Iterator<Cat> iterator = catList2.iterator();
while(iterator.hasNext()){
Cat tmpCat = iterator.next();
System.out.print(tmpCat.getName()+",");
System.out.print(tmpCat.getSex()+",");
System.out.println(tmpCat.getColor());
}
}
}