JAVA中关于对像的读写

 /**
  * 针对对象的文件读写
  */

 //导入包
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.util.HashMap;

 public class qwe {

     public static void main(String[] args) {
         try {
             File f = new File("D:\\Desktop\\NewFile\\hasKey.txt");//关联文件
             FileOutputStream wr = new FileOutputStream("D:\\Desktop\\NewFile\\hasKey.txt");//文件写
             ObjectOutputStream objw = new ObjectOutputStream(wr);//创建对象输出流
             FileInputStream re = new FileInputStream("D:\\Desktop\\NewFile\\hasKey.txt");//读文件
             ObjectInputStream objr = new ObjectInputStream(re); //创建对象输入流
             HashMap<String,String> has = new HashMap<String,String>();//创建集合
             has.put("001", "hello")    ;                

             objw.writeObject(has);//从对象输出流中写入
             HashMap<String, String> has1 = (HashMap<String, String>) objr.readObject();//从对象输入流中读（强制转换类型）

             System.out.println(has1);                        

         } catch (FileNotFoundException e) {//无文件异常捕获
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         catch (IOException e) {//捕获IO异常
             // TODO Auto-generated catch block
             e.printStackTrace();
         }catch (ClassNotFoundException e) {//捕获不存在的类型的异常

                 e.printStackTrace();
             }

     }

 }

运行结果为

存入文本的数据是