Java操作JSON数据(5)--jettison操作JSON数据

jettison是一个简单的JSON处理库，提供JSON和其JSONObject对象相互转化的方法，转为自定义bean时需要再手动将JSONObject对象转为需要的bean。本介绍下jettison的基本使用方法，包括序列化和反序列化；文中所使用到的软件版本：Java 1.8.0_191、jettison 1.4.1。

1、引入依赖

<dependency>
    <groupId>org.codehaus.jettison</groupId>
    <artifactId>jettison</artifactId>
    <version>1.4.1</version>
</dependency>

2、序列化

public static String serialize() throws JSONException {
    JSONObject jsonObject = new JSONObject();
    jsonObject.put("name", "jack");
    jsonObject.put("age", 20);
    JSONArray address = new JSONArray();
    address.put("address1");
    address.put("address2");
    jsonObject.put("address", address);
    JSONArray friends = new JSONArray();
    Map<String, String> friend1 = new HashMap(){
        {
            put("name", "name1");
            put("age", "21");
        }
    };
    Map<String, String> friend2 = new HashMap(){
        {
            put("name", "name2");
            put("age", "22");
        }
    };
    friends.put(friend1);
    friends.put(friend2);
    jsonObject.put("friends", friends);
    String result = jsonObject.toString();
    System.out.println(result);
    return result;
}

3、反序列化

public static void deserialize(String json) throws JSONException {
    JSONObject jsonObject = new JSONObject(json);
    System.out.println(jsonObject.get("name"));
    JSONArray address = jsonObject.getJSONArray("address");
    System.out.println(address.get(0));
    JSONArray friends = jsonObject.getJSONArray("friends");
    System.out.println(friends.getJSONObject(0).get("name"));
}

4、完整例子

package com.abc.demo.general.json;

import org.codehaus.jettison.json.*;

import java.util.HashMap;
import java.util.Map;

/**
 * Jettison使用
 */
public class JettisonCase {
    /**
     * 序列化
     */
    public static String serialize() throws JSONException {
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("name", "jack");
        jsonObject.put("age", 20);
        JSONArray address = new JSONArray();
        address.put("address1");
        address.put("address2");
        jsonObject.put("address", address);
        JSONArray friends = new JSONArray();
        Map<String, String> friend1 = new HashMap(){
            {
                put("name", "name1");
                put("age", "21");
            }
        };
        Map<String, String> friend2 = new HashMap(){
            {
                put("name", "name2");
                put("age", "22");
            }
        };
        friends.put(friend1);
        friends.put(friend2);
        jsonObject.put("friends", friends);
        String result = jsonObject.toString();
        System.out.println(result);
        return result;
    }

    /**
     * 反序列化
     */
    public static void deserialize(String json) throws JSONException {
        JSONObject jsonObject = new JSONObject(json);
        System.out.println(jsonObject.get("name"));
        JSONArray address = jsonObject.getJSONArray("address");
        System.out.println(address.get(0));
        JSONArray friends = jsonObject.getJSONArray("friends");
        System.out.println(friends.getJSONObject(0).get("name"));
    }

    public static void main(String[] args) throws Exception {
        String json = serialize();
        deserialize(json);
    }
}