将java Console输出的JSON格式字符串转化得易读的JSON代码网址
JSONObject与java中的String，map，Object等的转换
【1】org.json包的常用方法
<1>创建JSONObject对象并直接添加内容

public class JSONStudy { public static void main(String[] args) { TestJSONObject(); } public static void TestJSONObject(){ JSONObject jsonObject = new JSONObject(); jsonObject.put("name", "食人魔魔法师"); jsonObject.put("type", "弱智型"); jsonObject.put("技能", new String[]{"爆裂轰炸","多重施法"}); jsonObject.put("是否超神?", false); System.out.println(jsonObject.toString()); //将JSON转化为字符串输出 } }

输出结果：

{ "name": "食人魔魔法师", "是否超神?": false, "type": "弱智型", "技能": [ "爆裂轰炸", "多重施法" ] }

<2>将map转化为json对象并输出

public static void TestMapToJSON(){ Map<String,Object> jsonMap = new HashMap<String, Object>(); jsonMap.put("name", "祈求者"); jsonMap.put("type", "弱智型"); jsonMap.put("技能", new String[]{"天火","磁暴"}); jsonMap.put("是否超神?", true); System.out.println(new JSONObject(jsonMap).toString()); //将map转化为JSONObject输出 }

结果为

{ "name": "祈求者", "是否超神?": true, "type": "弱智型", "技能": [ "天火", "磁暴" ] }

<3>将POJO类转化为JSONObject

public static void TestPOJOToJSON(){ Hero jsonHero = new Hero(); jsonHero.setName("幻影刺客"); jsonHero.setType("敏捷型"); jsonHero.setTalent(new String[]{"窒息之刃","恩赐解脱"}); jsonHero.setHolyShit(true); System.out.println(new JSONObject(jsonHero).toString()); }

输出结果为

{ "holyShit": true, "name": "幻影刺客", "talent": [ "窒息之刃", "恩赐解脱" ], "type": "敏捷型" }

【2】fastjson包
<1>// 将Java对象序列化为JSON字符串，支持各种各种Java基本类型和JavaBean
// public static String toJSONString(Object object, SerializerFeature… features);
例子:

String jsonString = JSON.toJSONString(jsonHero,true); System.out.println(jsonString);

输出

{ "holyShit":true, "name":"幻影刺客", "talent":["窒息之刃","恩赐解脱"], "type":"敏捷型" }

<2>// 将Java对象序列化为JSON字符串，返回JSON字符串的utf-8 bytes
// public static byte[] toJSONBytes(Object object, SerializerFeature… features);

byte[] jsonbyte = JSON.toJSONBytes(jsonHero); System.out.println(Arrays.toString(jsonbyte)); [123, 34, 104, 111, 108, 121, 83, 104, 105, 116, 34, 58, 116, 114, 117, 101, 44, 34, 110, 97, 109, 101, 34, 58, 34, -27, -71, -69, -27, -67, -79, -27, -120, -70, -27, -82, -94, 34, 44, 34, 116, 97, 108, 101, 110, 116, 34, 58, 91, 34, -25, -86, -110, -26, -127, -81, -28, -71, -117, -27, -120, -125, 34, 44, 34, -26, -127, -87, -24, -75, -112, -24, -89, -93, -24, -124, -79, 34, 93, 44, 3 4,116, 121, 112, 101, 34, 58, 34, -26, -107, -113, -26, -115, -73, -27, -98, -117, 34, 125]

<3>// public static final Object toJSON(Object javaObject);
// 将JavaBean转换为JSONObject或者JSONArray。

com.alibaba.fastjson.JSONObject jsonObject = (com.alibaba.fastjson.JSONObject) JSON.toJSON(jsonHero); System.out.println(jsonObject.toString()); {"holyShit":true,"name":"幻影刺客","talent":["窒息之刃","恩赐解脱"],"type":"敏捷型"}

<4>json文本转化为其他
public static final Object parse(String text); // 把JSON文本parse为JSONObject或者JSONArray
public static final JSONObject parseObject(String text)； // 把JSON文本parse成JSONObject
public static final T parseObject(String text, Class clazz); // 把JSON文本parse为JavaBean

String jsonString = JSON.toJSONString(jsonHero,true); com.alibaba.fastjson.JSONObject jsonObject = (com.alibaba.fastjson.JSONObject) JSON.parse(jsonString); System.out.println(jsonObject.toString()); Hero hero = JSON.parseObject(jsonString, Hero.class); System.out.println(hero.toString()); 结果为: {"holyShit":true,"name":"幻影刺客","talent":["窒息之刃","恩赐解脱"],"type":"敏捷型"} Hero [name=幻影刺客, type=敏捷型, talent=[窒息之刃, 恩赐解脱], holyShit=true]

<5>map与JSONObject互转
例子:

public static void TestMapToJSON(){ Map<String,Object> jsonMap = new HashMap<String, Object>(); jsonMap.put("name", "祈求者"); jsonMap.put("type", "弱智型"); jsonMap.put("技能", new String[]{"天火","磁暴"}); jsonMap.put("是否超神?", true); String jsonString = JSON.toJSONString(jsonMap,true); //Map转化为JSON string System.out.println(jsonString); Map<String, Object> jsonMap2 = new HashMap<String, Object>(); //JSON string 转化为 Map jsonMap2 = (Map<String, Object>) JSON.parse(jsonString); for (String key : jsonMap2.keySet()) { System.out.println(key+":"+jsonMap2.get(key)); } }

输出结果:

{ "name":"祈求者", "是否超神?":true, "type":"弱智型", "技能":["天火","磁暴"] } name:祈求者 是否超神?:true type:弱智型 技能:["天火","磁暴"]