实体类转Json的2种方法

首先申明所需jar包：

ezmorph-1.0.6.jar

jackson-all-1.7.6.jar

jsoup-1.5.2.jar

一、创建一个实体类Emp.

 package com.hyx.entity;

 public class Emp {
     private Integer id;
     private String name;
     private Integer dptNo;
     private String gender;
     private String duty;

     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public Integer getDptNo() {
         return dptNo;
     }
     public void setDptNo(Integer dptNo) {
         this.dptNo = dptNo;
     }
     public String getGender() {
         return gender;
     }
     public void setGender(String gender) {
         this.gender = gender;
     }
     public String getDuty() {
         return duty;
     }
     public void setDuty(String duty) {
         this.duty = duty;
     }

 }

二、实体类转换为Json

(1)

 import java.io.IOException;

 import net.sf.json.JSONObject;

 import org.apache.struts2.json.JSONException;
 import org.codehaus.jackson.map.ObjectMapper;

 import com.hyx.entity.Emp;

 public class MainTest {

     public static<T> String 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 JSONObject.fromObject(obj).toString();
     }

     // 主函数
     public static void main(String[] args) {

         Emp emp=new Emp();
         emp.setId(1);
         emp.setName("张三");
         emp.setGender("男");
         emp.setDptNo(001);
         emp.setDuty("职员");

         String jsonStr="";
         try {
              jsonStr=objectToJson(emp);
         } catch (JSONException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

         System.out.println(jsonStr);

     }

 }

(2)

 import net.sf.json.JSONObject;

 import com.hyx.entity.Emp;

 public class MainTest {

     // 主函数
     public static void main(String[] args) {

         Emp emp=new Emp();
         emp.setId(1);
         emp.setName("张三");
         emp.setGender("男");
         emp.setDptNo(001);
         emp.setDuty("职员");

         JSONObject jsonObject = JSONObject.fromObject(emp);

         System.out.println(jsonObject);

     }

 }