实体类和JSON对象之间相互转化，实体json对象转化,在需要用到JSON对象封

实体类和JSON对象之间相互转化，实体json对象转化,在需要用到JSON对象封

在需要用到JSON对象封装数据的时候，往往会写很多代码，也有很多复制粘贴，为了用POJO的思想我们可以装JSON转化为实体对象进行操作```javapackage myUtil;

import java.io.IOException;

import myProject.Student;import myProject.StudentList;

import org.codehaus.jackson.map.ObjectMapper;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;/ * 实体类和JSON对象之间相互转化（依赖包jackson-all-1.7.6.jar、jsoup-1.5.2.jar） * @author wck /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);}

}

``````javapackage myProject;

public class Student { private String name; private int age; //private StudentClass studentClass; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "Student [name=" + name + ", age=" + age + "]"; }}

``````javapackage myProject;

import java.util.List;

public class StudentList { List<Student> student; public List<Student> getStudent() { return student; }

    public void setStudent(List<Student> student) {        this.student = student;    }    @Override    public String toString() {        return "StudentList [student=" + student + "]";    }

}

```