java生成json数据示例

JsonTools.java

复制代码 代码如下:

package com.lihua.json.tools;
import net.sf.json.JSONObject;

public class JsonTools {

public JsonTools() {

}

/**

* @param key

* 表示json字符串的头信息

* @param value

* 是对解析的集合的类型

* @return

*/

//将数据转换为Json

public static String createJsonString(String key, Object value) {

JSONObject jsonObject = new JSONObject();

jsonObject.put(key, value);

return jsonObject.toString();

}

}

Person.java:

复制代码 代码如下:

package com.lihua.json.domain;
public class Person {

private int id;

private String name;

private String address;

public Person() {

}

public Person(int id, String name, String address) {

super();

this.id = id;

this.name = name;

this.address = address;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

//重写toString()方法

@Override

public String toString() {

return "Person [id=" + id + ", name=" + name + ", address=" + address

+ "]";

}

}

JsonService.java :

复制代码 代码如下:

package com.lihua.json.service;
import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import com.lihua.json.domain.Person;

public class JsonService {

public JsonService() {

}

//声明一个Person类型的方法，并为其添加单个对象

public Person getPerson() {

Person person = new Person(1001,"jack","beijing");

return person;

}

//声明一个List<Person>类型的方法，并为其添加多个对象

public List<Person> getlistPerson() {

List<Person> list = new ArrayList<Person>();

Person person1 = new Person(100,"jack","广东");

Person person2 = new Person(101,"rose","广西");

list.add(person1);

list.add(person2);

return list;

}

//声明一个List<String>类型的方法，并为其添加单个对象

public List<String> getlistString() {

List<String> list = new ArrayList<String>();

list.add("北京");

list.add("上海");

list.add("广东");

list.add("广西");

return list;

}

//声明一个List<Map<String,Object>>类型的方法，并为其添加多个对象

public List<Map<String,Object>> getListMap() {

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

Map<String,Object> map1 = new HashMap<String,Object>();

map1.put("id", 100);

map1.put("name", "jack");

map1.put("address", "北京");

Map<String,Object> map2 = new HashMap<String,Object>();

map2.put("id", 100);

map2.put("name", "rose");

map2.put("address", "上海");

list.add(map1);

list.add(map2);

return list;

}

}

Test.java :

复制代码 代码如下:

package com.lihua.json.test;
import java.util.List;

import java.util.Map;

import com.lihua.json.domain.Person;

import com.lihua.json.service.JsonService;

import com.lihua.json.tools.JsonTools;

public class Test {

public Test() {

}

public static void main(String[] args) {

String msg = "";

//new一个JsonService对象

JsonService service = new JsonService();

//声明一个Person对象，并取得person对象中的数据

Person person = service.getPerson();

//将person对象中的数据转换为json数据，并保存到msg中

msg = JsonTools.createJsonString("person", person);

System.out.println("---->"+msg);

List<Person> list = service.getlistPerson();

msg = JsonTools.createJsonString("person", list);

System.out.println("---->"+msg);

List<Map<String, Object>> listmap = service.getListMap();

msg = JsonTools.createJsonString("person", listmap);

System.out.println("---->"+msg);

}

}

运行结果：