java对象与json对象间的相互转换的方法

JSONObject jsonObject = JSONObject.fromObject(jsonStr);

String name = jsonObject.getString("name");int num = jsonObject.getInt("num");String sex = jsonObject.getString("sex");int age = jsonObject.getInt("age");

JSONObject obj = new JSONObject().fromObject(jsonStr);//将json字符串转换为json对象

Person jb = (Person)JSONObject.toBean(obj,Person.class);//将建json对象转换为Person对象

JSONObject json = JSONObject.fromObject(obj);//将java对象转换为json对象String str = json.toString();//将json对象转换为字符串

package baz.parse;  import java.util.ArrayList; import java.util.List;  import net.sf.json.JSON; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import net.sf.json.JSONSerializer; import baz.bean.Person;  public class ParseJson {      private String jsonStr;      public ParseJson() {        }      public ParseJson(String str){     this.jsonStr = str;   }   /**    * 解析json字符串    */   public void parse(){     JSONObject jsonObject = JSONObject.fromObject(jsonStr);     String name = jsonObject.getString("name");     int num = jsonObject.getInt("num");     String sex = jsonObject.getString("sex");     int age = jsonObject.getInt("age");          System.out.println(name + " " + num + " " + sex + " " + age);   }   //将json字符串转换为java对象   public Person JSON2Object(){     //接收{}对象，此处接收数组对象会有异常     if(jsonStr.indexOf("[") != -1){       jsonStr = jsonStr.replace("[", "");     }     if(jsonStr.indexOf("]") != -1){       jsonStr = jsonStr.replace("]", "");     }     JSONObject obj = new JSONObject().fromObject(jsonStr);//将json字符串转换为json对象     Person jb = (Person)JSONObject.toBean(obj,Person.class);//将建json对象转换为Person对象     return jb;//返回一个Person对象   }     } 

package baz.bean;  public class Person {      private String name;   private int num;   private String sex;   private int age;      public Person() {     // TODO Auto-generated constructor stub   }    public Person(String name, int num, String sex, int age) {     super();     this.name = name;     this.num = num;     this.sex = sex;     this.age = age;   }      public String getName() {     return name;   }    public void setName(String name) {     this.name = name;   }    public int getNum() {     return num;   }    public void setNum(int num) {     this.num = num;   }    public String getSex() {     return sex;   }    public void setSex(String sex) {     this.sex = sex;   }    public int getAge() {     return age;   }    public void setAge(int age) {     this.age = age;   }    } 

package baz.cons;  import net.sf.json.JSONObject;  /**  * 将java对象转换为json字符串  * @author Administrator  *  */ public class ConsJson {      public ConsJson() {     // TODO Auto-generated constructor stub   }      public String Object2Json(Object obj){     JSONObject json = JSONObject.fromObject(obj);//将java对象转换为json对象     String str = json.toString();//将json对象转换为字符串          return str;   } } 

package baz.test;  import java.util.List;  import baz.bean.Person; import baz.cons.ConsJson; import baz.parse.ParseJson;   public class Test {   public static void main(String[] args) {          //将字符串转换为json对象，然后根据建得到相应的值     ParseJson pj = new ParseJson("{/"name/":/"gu/",/"num/":123456,/"sex/":/"male/",/"age/":24}");     pj.parse();          //将一个json字符串转换为java对象     Person p = pj.JSON2Object();     System.out.println("Name:" + p.getName());     System.out.println("Num:" + p.getNum());     System.out.println("Sex:" + p.getSex());     System.out.println("age:" + p.getAge());          //将一个java对象转换为Json字符串     Person p1 = new Person("gu1",123,"male",23);     ConsJson cj = new ConsJson();     String str1 = cj.Object2Json(p1);     System.out.println(str1);        }  } 

{"age":23,"name":"gu1","num":123,"sex":"male"}