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);
        
    }

}