java操作json数据之net.sf.json-lib( 二 ) _电脑

import java.util.List;
4.2 关头代码：
public static void testList(){
//将调集对象转为json对象， json字符串
List<Student> list= new ArrayList<Student>();
Student st = new Student();
st.setId(1);
st.setName("张三");
st.setSex("男");
Student st2 = new Student();
st2.setId(2);
st2.setName("小丽");
st2.setSex("女");
list.add(st);
list.add(st2);
//将类转为json对象
JSONArray array=JSONArray.fromObject(list);
System.out.println(array.toString());
【java操作json数据之net.sf.json-lib】//将json对象转为对应的调集类
JSONArray arrayBean = JSONArray.fromObject(array.toString());
List<Student> listBean = (List<Student>) JSONArray.toCollection(arrayBean,Student.class);
//输出转换后的成果
for (Student lst: listBean) {
System.out.println("name:"+lst.getName());
}
}

5第五
：多层实体类处置。
1、实体类：set和get方式本身生当作（set和get方式必需有）
public class Person private String id; private Person pserson;
}
2、关头测试代码：实体类Person 属性仍是Person 时json解析为实体类时一次搞定。
import net.sf.json.JSONObject;
public static void main(String[] args) { Person p1 = new Person(); p1.setId("111"); Person p2 = new Person(); p2.setId("222"); Person p3 = new Person(); p3.setId("333"); p1.setPserson(p2); p2.setPserson(p3); JSONObject jsonp = JSONObject.fromObject(p1); System.out.println(jsonp); Object objp = JSONObject.toBean(jsonp,Person.class); Person p4 = (Person) objp; Person p5 = p4.getPserson(); Person p6 = p5.getPserson(); System.out.println(p6.getId());}
3、map属性中存放map时比力麻烦需要利用MorphDynaBean 或者get一次解析一次。
public static void main(String[] args) { Map map1 = new HashMap(); Map map2 = new HashMap(); Map map3 = new HashMap(); map3.put("value","Male"); map2.put("ger",map3); map1.put("attributes",map2); JSONObject json = JSONObject.fromObject(map1); System.out.println(json); Object obj2 = JSONObject.toBean(json,Map.class); Map map = (Map) obj2; MorphDynaBean map4 = (MorphDynaBean) map.get("attributes"); MorphDynaBean map5 = (MorphDynaBean) map4.get("ger"); String male = (String) map5.get("value"); System.out.println(male); //或者利用get一次解析一次 JSONObject json3 = JSONObject.fromObject(json.get("attributes")); Map map6 = (Map) JSONObject.toBean(json3,Map.class); JSONObject json4 = JSONObject.fromObject(json3.get("ger")); Map map7 = (Map) JSONObject.toBean(json4,Map.class); System.out.println(map7.get("value"));}

java操作json数据之net.sf.json-lib( 二 )

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