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.

 1 package com.hyx.entity;
 2
 3 public class Emp {
 4     private Integer id;
 5     private String name;
 6     private Integer dptNo;
 7     private String gender;
 8     private String duty;
 9
10     public Integer getId() {
11         return id;
12     }
13     public void setId(Integer id) {
14         this.id = id;
15     }
16     public String getName() {
17         return name;
18     }
19     public void setName(String name) {
20         this.name = name;
21     }
22     public Integer getDptNo() {
23         return dptNo;
24     }
25     public void setDptNo(Integer dptNo) {
26         this.dptNo = dptNo;
27     }
28     public String getGender() {
29         return gender;
30     }
31     public void setGender(String gender) {
32         this.gender = gender;
33     }
34     public String getDuty() {
35         return duty;
36     }
37     public void setDuty(String duty) {
38         this.duty = duty;
39     }
40
41 }

二、实体类转换为Json

(1)

 1 import java.io.IOException;
 2
 3 import net.sf.json.JSONObject;
 4
 5 import org.apache.struts2.json.JSONException;
 6 import org.codehaus.jackson.map.ObjectMapper;
 7
 8 import com.hyx.entity.Emp;
 9
10
11
12 public class MainTest {
13
14     public static<T> String objectToJson(T obj) throws JSONException, IOException {
15         ObjectMapper mapper = new ObjectMapper();
16         // Convert object to JSON string
17         String jsonStr = "";
18         try {
19              jsonStr =  mapper.writeValueAsString(obj);
20         } catch (IOException e) {
21             throw e;
22         }
23         return JSONObject.fromObject(obj).toString();
24     }
25
26     // 主函数
27     public static void main(String[] args) {
28
29         Emp emp=new Emp();
30         emp.setId(1);
31         emp.setName("张三");
32         emp.setGender("男");
33         emp.setDptNo(001);
34         emp.setDuty("职员");
35
36         String jsonStr="";
37         try {
38              jsonStr=objectToJson(emp);
39         } catch (JSONException e) {
40             e.printStackTrace();
41         } catch (IOException e) {
42             e.printStackTrace();
43         }
44
45         System.out.println(jsonStr);
46
47
48     }
49
50 }

(2)

 1 import net.sf.json.JSONObject;
 2
 3 import com.hyx.entity.Emp;
 4
 5
 6
 7 public class MainTest {
 8
 9     // 主函数
10     public static void main(String[] args) {
11
12         Emp emp=new Emp();
13         emp.setId(1);
14         emp.setName("张三");
15         emp.setGender("男");
16         emp.setDptNo(001);
17         emp.setDuty("职员");
18
19         JSONObject jsonObject = JSONObject.fromObject(emp);
20
21         System.out.println(jsonObject);
22
23     }
24
25 }