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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

package 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);
	}
}

package 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 + "]";
		}
}

package 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 + "]";
		}   
}