java 方式的将 java 对象以及 list 或者 map 转化为 json 数据

JavajsonAjax.net

学会了在

j2ee中使用ajax后,

有时候从服务器返回客户端的数据是对象,自己手动拼凑

json

字符串容易出错,

通过谷歌知道了

json-lib

这个类库,

方便的支持

java

中对象到

json

字符串的转化。

source-forge

json-lib

介绍说,需要

jakartacommons-lang2.4

jakartacommons-beanutils1.7.0

jakartacommons-collections3.2

jakartacommons-logging1.1.1

ezmorph1.0.6这些jar

包的支持,下载下来试了一把,挺好用的,写出来,与大家分享。

代码如下:

importjava.util.ArrayList;

importjava.util.HashMap;

importjava.util.List;

importjava.util.Map;

importnet.sf.json.JSONArray;

importnet.sf.json.JSONObject;

publicclassTest{

publicstaticvoidmain(String[]args){

//

当是对象的时候

Studentstudent=newStudent();

student.setAge(18);

student.setName("zhangsan");

student.setSex("male");

JSONObjectjsonObject=JSONObject.fromObject(student);

System.out.println(jsonObject);//

输出

{"age":18,"name":"zhangsan","sex":"male"}

//

当是数组或

list

的时候

Student[]stus=newStudent[5];

List<Student>stuList=newArrayList<Student>();

for(inti=0;i<stus.length;i++){

stus[i]=newStudent();

stus[i].setAge(i*10+8);

stus[i].setName("zhang"+i);

stus[i].setSex("male");

//

添加到

list,

一会儿用

stuList.add(stus[i]);

}

JSONArrayjsonArray=JSONArray.fromObject(stus);

System.out.println(jsonArray);//

和下面打印的结果相同

//

[{"age":8,"name":"zhang0","sex":"male"},{"age":18,"name":"zhang1","sex":"male"},{"a

ge":28,"name":"zhang2","sex":"male"},{"age":38,"name":"zhang3","sex":"male"},{"ag

e":48,"name":"zhang4","sex":"male"}]

JSONArrayjsonArrayFromList=JSONArray.fromObject(stuList);

System.out.println(jsonArrayFromList);//

和上面打印的结果相同

//

当既有对象又有数组的时候

Map<String,Object>map=newHashMap<String,Object>();

Teacherteacher=newTeacher();

teacher.setAge(30);

teacher.setName("laoshi");

teacher.setSex("male");

map.put("teacher",teacher);

map.put("student",stuList);

JSONObjectjsonObjectFromMap=JSONObject.fromObject(map);

System.out.println(jsonObjectFromMap);

//

结果:

//{"student":[{"age":8,"name":"zhang0","sex":"male"},{"age":18,"name":"zhang1","se

x":"male"},{"age":28,"name":"zhang2","sex":"male"},{"age":38,"name":"zhang3","sex"

:"male"},{"age":48,"name":"zhang4","sex":"male"}],"teacher":{"age":30,"name":"laosh

i","sex":"male"}}

}

}

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