java实体类怎么转换成json。 java怎么把数据转成json 数组
Java\u5b9e\u4f53\u7c7b\u8f6c\u6362\u6210json\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5 \u6700\u597d\u544a\u8bc9\u6211\u9700\u8981\u54ea\u4e9bjar\u8fd9\u91cc\u8bb2\u7684\u5f88\u6e05\u695a\u3002
http://www.sojson.com/blog/100.html
\u6709\u4e24\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff1a
\uff081\uff09\u76f4\u63a5\u8f6c\u6362\uff1a
\u521b\u5efaJSONArray\u5bf9\u8c61\u3001JSONObject\u5bf9\u8c61\uff0c\u901a\u8fc7put\u65b9\u6cd5\u5c06\u5176\u6570\u636e\u4ee5\u952e\u503c\u5bf9\u7684\u5f62\u5f0f\u586b\u5145\uff0c\u5982\u4f8b\uff1a
//\u5047\u5982\u6709\u4e00\u4e2aJava\u5b9e\u4f53\u7c7bPerson\uff0c\u5305\u62ec\u4ee5\u4e0b\u5c5e\u6027\uff1aphone\u3001sex\u3001married\u3001address\u3002
ArrayList persons = new ArrayList();
for (int i = 0; i < 3; i++) {
persons.add(new Person("138******67", "\u5973", true, "\u5317\u4eac\u671d\u9633\u533a"));//\u586b\u5145Java\u5b9e\u4f53\u7c7b\u96c6\u5408
}
JSONArray array = new JSONArray();// Json\u683c\u5f0f\u7684\u6570\u7ec4\u5f62\u5f0f
JSONObject obj;//json\u683c\u5f0f\u7684\u5355\u4e2a\u5bf9\u8c61\u5f62\u5f0f
for (int i = 0; i < persons.size(); i++) {
obj = new JSONObject();
//\u4f9d\u6b21\u586b\u5145\u6bcf\u4e00\u4e2aJava\u5b9e\u4f53\u5bf9\u8c61
try {
obj.put("phone", persons.get(i).getPhone());//json\u901a\u8fc7put\u65b9\u5f0f\u4ee5key-value\u5f62\u5f0f\u586b\u5145
obj.put("sex", persons.get(i).getSex());
obj.put("married", persons.get(i).getMarried());
obj.put("address", persons.get(i).getAddress());
array.put(obj);//\u5c06JSONObject\u6dfb\u52a0\u5165JSONArray
} catch (JSONException e) {
e.printStackTrace();
}
}
\uff082\uff09\u901a\u8fc7GSON\u5de5\u5177\u5b9e\u73b0\uff1a
\u53ea\u9700\u8981\u521b\u5efaGSON\u5bf9\u8c61\uff0c\u901a\u8fc7toJson\u65b9\u6cd5\u8f6c\u6362\u5373\u53ef\u3002\u5982\u4f8b\uff1a
//\u6a21\u62dfJava\u6570\u636e
Person person = new Person("\u654f\u654f", 23, "\u5973", "\u5317\u4eac\u5e02\u6d77\u6dc0\u533a");
//\u521b\u5efaGSON\u5bf9\u8c61
Gson gson = new Gson();
//\u8c03\u7528toJson\u65b9\u6cd5\u5373\u53ef\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u7684json\u683c\u5f0f
String json = gson.toJson(person);
然后实例化Gson
static Gson gosn = new Gson();
String json = gosn.toJson(hashMap); //这里放一个对象，什么对象都可以。
转化后就是Json，功能强大很多，也简单很多。
json-lib-2.4-jdk15.jar
ezmorph-1.0.6.jar
转换的话这样用
String s= JSONArray.fromObject(user).toString();
spring-webmvc4
在方法上加入@ResponseBody，同时方法返回值为实体对象，spring会自动将对象转换为json格式，并返回到客户端
实例代码：
public class JSONUtil {
/**
* 将json转化为实体POJO
* @param jsonStr
* @param obj
* @return
*/
public static<T> Object JSONToObj(String jsonStr,Class<T> obj) {
T t = null;
try {
ObjectMapper objectMapper = new ObjectMapper();
t = objectMapper.readValue(jsonStr,
obj);
} catch (Exception e) {
e.printStackTrace();
}
return t;
}
/**
* 将实体POJO转化为JSON
* @param obj
* @return
* @throws JSONException
* @throws IOException
*/
public static<T> JSONObject objectToJson(T obj) throws JSONException, IOException {
ObjectMapper mapper = new ObjectMapper();
// Convert object to JSON string
String jsonStr = "";
try {
jsonStr = mapper.writeValueAsString(obj);
} catch (IOException e) {
throw e;
}
return new JSONObject(jsonStr);
}
public static void main(String[] args) throws JSONException, IOException {
JSONObject obj = null;
obj = new JSONObject();
obj.put("name", "213");
obj.put("age", 27);
JSONArray array = new JSONArray();
array.put(obj);
obj = new JSONObject();
obj.put("name", "214");
obj.put("age", 28);
array.put(obj);
Student stu = (Student) JSONToObj(obj.toString(), Student.class);
JSONObject objList = new JSONObject();
objList.put("student", array);
System.out.println("objList:"+objList);
StudentList stuList = (StudentList) JSONToObj(objList.toString(), StudentList.class);
System.out.println("student:"+stu);
System.out.println("stuList:"+stuList);
System.out.println("#####################################");
JSONObject getObj = objectToJson(stu);
System.out.println(getObj);
}
}
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