json字符串和object之间的相互转化

package asi;
import java.util.ArrayList;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
public class TestJSONObject {
 private String name;
 private String sex;

 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public String getSex() {
  return sex;
 }
 public void setSex(String sex) {
  this.sex = sex;
 }

 //json字符串转化为JSONObject类
 public static JSONObject JSON2Object(String json){
  JSONObject object=(JSONObject) JSONObject.parseObject(json);
  return object;
 }
 //json的list转化为ArrayList<JSONObject>
 public static ArrayList<JSONObject> JSONList2Object(String jsonList){
  ArrayList<JSONObject> objectList=(ArrayList<JSONObject>) JSONObject.parseObject(jsonList,ArrayList.class);
  return objectList;
 }

 //object转化为json
 public static String Object2JSON(Object o){
  return JSON.toJSONString(o);

 }

 public static void main(String[] args) {

  String json="{\"username\": \"Bonnie\",\"listData\": [{\"address\": \"石景山区\",\"street\": \"裕华路\"},{\"address\": \"海淀区\",\"street\": \"中山路\"}]}";
  try{
   //1、测试json转换成object
   JSONObject object=JSON2Object(json);
   String username=(String) object.get("username");
   System.out.println(username);

   String listData=String.valueOf(object.get("listData"));
     //(String) object.get("listData");
   System.out.println(listData);

   ArrayList<JSONObject> objectList=JSONList2Object(listData);
   for(int i=0;i<objectList.size();i++){
    System.out.println((String)((JSONObject) (objectList.toArray())[i]).get("address"));
    System.out.println((String)((JSONObject) (objectList.toArray())[i]).get("street"));
   }
   //2、测试object转化成json
   TestJSONObject t=new TestJSONObject();
   t.setName("Bonnie");
   t.setSex("female");

   System.out.println(Object2JSON(t));
  }catch(JSONException e){
   e.printStackTrace();
  }

 }
}

注意要导入jar:

<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
   <version>1.2.2</version>
  </dependency>