java生成json數據示例

2019-11-26 15:33:50

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來源：轉載

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JsonTools.java

復制代碼代碼如下:

package com.lihua.json.tools;

import net.sf.json.JSONObject;

public class JsonTools {

public JsonTools() {

}

/**
* @param key
*            表示json字符串的頭信息
* @param value
*            是對解析的集合的類型
* @return
*/
//將數據轉換為Json
public static String createJsonString(String key, Object value) {
  JSONObject jsonObject = new JSONObject();
  jsonObject.put(key, value);
  return jsonObject.toString();

}

Person.java:

復制代碼代碼如下:

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;
}

//重寫toString()方法
@Override
public String toString() {
return "Person [id=" + id + ", name=" + name + ", address=" + address
+ "]";
}

}

JsonService.java :

復制代碼代碼如下:

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() {

}

//聲明一個Person類型的方法，并為其添加單個對象
public Person getPerson() {
  Person person = new Person(1001,"jack","beijing");
  return person;

}
//聲明一個List<Person>類型的方法，并為其添加多個對象
public List<Person> getlistPerson() {
  List<Person> list = new ArrayList<Person>();
  Person person1 = new Person(100,"jack","廣東");
  Person person2 = new Person(101,"rose","廣西");
  list.add(person1);
  list.add(person2);
  return list;
}
//聲明一個List<String>類型的方法，并為其添加單個對象
public List<String> getlistString() {
  List<String> list = new ArrayList<String>();
  list.add("北京");
  list.add("上海");
  list.add("廣東");
  list.add("廣西");
  return list;
}

//聲明一個List<Map<String,Object>>類型的方法，并為其添加多個對象
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 :

復制代碼代碼如下:

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一個JsonService對象
  JsonService service = new JsonService();
  //聲明一個Person對象，并取得person對象中的數據
  Person person = service.getPerson();
  //將person對象中的數據轉換為json數據，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);
}
}