java中实体类转Json的2种方法

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;  }}

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);          }}

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);      }}