反序列化对象时出现EOFException

时间:2014-02-25 16:32:04

标签: java serialization deserialization eofexception

我创建了一个方法writeFile,如果标记为File,则会直接写入true。如果标记为false,则会显示File,检索Object,附加内容并再次将其保存到File。当标志为EOFException时,我收到true

以下是我正在尝试的全班:

public class HandleObjects{

public final static String PATH = "/home/user/Desktop/exp.conf" ; 
public static boolean i = true  ; 
public static void main(String[] args) throws JSONException, IOException,                ClassNotFoundException {


JSONObject obj = new JSONObject();
obj.put("id", "something");

JSONObject obj1 = new JSONObject();
obj1.put("key", "xxxxxxxxxxxxxxx");
obj1.put("token", "xxxxxxxxxxxxx");


writeFile(obj,false);
    readFile();   
writeFile(obj1,true); // Exception occurs here 
readFile();

     }

 public static void writeFile(JSONObject o,  boolean flag ) throws FileNotFoundException, IOException, JSONException, ClassNotFoundException{
        ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream(PATH)) ;
        JSONObject ob = null ;
        if (flag){
             ob = readfile();
            ob.append("extra", o);
            os.writeObject(ob.toString());
            }
        else{
            os.writeObject(o.toString());
        }

        os.flush() ;
        os.close();

        }
 public static JSONObject readFile() throws FileNotFoundException, IOException, JSONException, ClassNotFoundException{
     ObjectInputStream is = new ObjectInputStream(new FileInputStream(PATH))  ;

    String  str= (String) is.readObject() ;

    JSONObject o = new JSONObject(str);

    is.close() ;
    return o ;
    }}`

1 个答案:

答案 0 :(得分:1)

当你处于'追加'模式时,你已经在调用readfile()之前创建了一个新的空文件,所以你在尝试读取一个对象时当然会得到EOF。没有。您需要在创建FileOutputStream之前调用readfile()。