java.io.StreamCorruptedException：读取多个对象时格式错误
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这个问题已经在这里有了答案： > StreamCorruptedException: invalid type code: AC 1个
我试图在每次单击按钮时将一个对象(OneChatMessage类的对象)添加到文件中.然后,我尝试从文件中读取所有对象,并将其加载到ArrayList中.但是我在反序列化函数的ObjectInputStream.readObject()的第二次迭代中得到了StreamCorruptedException.我已经验证了第一次迭代可以正常工作.
我已经读过许多关于同一问题的其他文章：
>一个建议(Deserialize multiple Java Objects)是将整个数组列表而不是单个对象写入文件.但这似乎很浪费,因为每次单击按钮时我都需要写入文件,并且随着时间的推移将有数百个对象.
>另一个建议(StreamCorruptedException: invalid type code: AC)与ObjectOutputStream创建的不同标头有关.我不知道该用谁来解决这个问题.
关于如何解决这个问题的任何想法吗？
OneChatMessage.java：
package com.slapp.chat;
import java.io.Serializable;
import java.util.Date;
import com.slapp.localDB.Contact;
//This class defines the class for a chat message
public class OneChatMessage implements Serializable{
private String text;
private Date timeSent;
private Boolean sentByMe;
public OneChatMessage(String text, Date timeSent, Boolean sentByMe){
this.text = text;
this.timeSent = timeSent;
this.sentByMe = sentByMe;
}
public String getText(){
return this.text;
}
public Date getTimeSent(){
return this.timeSent;
}
@Override
public String toString(){
return new StringBuffer(" Text : ")
.append(this.text)
.append(" TimeSent : ")
.append(this.timeSent.toString()) // Need to use SimpleDatFormat to get the correct time zone and formatting. Leaving it for now.
.append(" SentByMe : ")
.append(this.sentByMe.toString()).toString();
}
}
序列化功能：
public void addMessage(OneChatMessage msg) {
FileOutputStream fos;
ObjectOutputStream oos;
File file = new File(context.getFilesDir(), "abc");
if (!file.exists()) {
Log.d("faizal",
"The file does not exist : ");
} else {
Log.d("faizal",
"The file already exists : ");
}
try {
fos = context.openFileOutput("abc",
Context.MODE_APPEND);
oos = new ObjectOutputStream(fos);
oos.writeObject(msg);
oos.close();
fos.close();
} catch (FileNotFoundException e) {
Log.d("faizal", "file not found : ");
e.printStackTrace();
} catch (IOException e) {
Log.d("faizal", "Error closing file : ");
e.printStackTrace();
}
}
反序列化功能：
public ArrayList<OneChatMessage> getAllChatMessagesArrayList() {
ArrayList<OneChatMessage> chatMessages = new ArrayList<OneChatMessage>();
OneChatMessage oneChatMsg;
FileInputStream fis;
ObjectInputStream ois;
try {
fis = context.openFileInput("abc");
ois = new ObjectInputStream(fis);
//Setting an arbitrarily large number as the limit of the loop iterations
//so that chat message are read from the file till EOF
for (int i = 1; i < 999999999; i++) {
try {
oneChatMsg = (OneChatMessage) ois.readObject();
} catch (EOFException e) {
//When EOFException occurs, quit the loop
break;
}
try{
chatMessages.add(oneChatMsg);
} catch(Exception e){
Log.d("faizal","Error adding message to Array List:" + oneChatMsg.getText());
e.printStackTrace();
}
}
ois.close();
fis.close();
return chatMessages;
} catch (FileNotFoundException e) {
Log.d("faizal", "The file not found : ");
e.printStackTrace();
} catch (IOException e) {
Log.d("faizal", "Error closing file : ");
e.printStackTrace();
} catch (ClassNotFoundException e) {
Log.d("faizal","Error reading object from file : ");
e.printStackTrace();
} catch (UnsupportedOperationException e) {
Log.d("faizal", "Error adding object to array list from file : ");
e.printStackTrace();
}
return null; // in case there was a caught exception
}
Logcat：
05-27 16:56:17.576: W/System.err(25028): java.io.StreamCorruptedException: Wrong format: ac
05-27 16:56:17.576: W/System.err(25028): at java.io.ObjectInputStream.corruptStream(ObjectInputStream.java:701)
05-27 16:56:17.576: W/System.err(25028): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:814)
05-27 16:56:17.576: W/System.err(25028): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2006)
05-27 16:56:17.576: W/System.err(25028): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1963)
05-27 16:56:17.576: W/System.err(25028): at com.slapp.chat.ChatPersistenceHandler.getAllChatMessagesArrayList(ChatPersistenceHandler.java:62)
05-27 16:56:17.576: W/System.err(25028): at com.example.slapp.ChatSessionActivity$ChatArrayAdapter.<init>(ChatSessionActivity.java:178)
05-27 16:56:17.576: W/System.err(25028): at com.example.slapp.ChatSessionActivity.onCreate(ChatSessionActivity.java:86)
05-27 16:56:17.576: W/System.err(25028): at android.app.Activity.performCreate(Activity.java:5372)
05-27 16:56:17.576: W/System.err(25028): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
05-27 16:56:17.576: W/System.err(25028): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
05-27 16:56:17.576: W/System.err(25028): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2362)
05-27 16:56:17.576: W/System.err(25028): at android.app.ActivityThread.access$700(ActivityThread.java:168)
05-27 16:56:17.576: W/System.err(25028): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1329)
05-27 16:56:17.576: W/System.err(25028): at android.os.Handler.dispatchMessage(Handler.java:99)
05-27 16:56:17.576: W/System.err(25028): at android.os.Looper.loop(Looper.java:137)
05-27 16:56:17.576: W/System.err(25028): at android.app.ActivityThread.main(ActivityThread.java:5493)
05-27 16:56:17.576: W/System.err(25028): at java.lang.reflect.Method.invokeNative(Native Method)
05-27 16:56:17.576: W/System.err(25028): at java.lang.reflect.Method.invoke(Method.java:525)
05-27 16:56:17.576: W/System.err(25028): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1209)
05-27 16:56:17.576: W/System.err(25028): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1025)
05-27 16:56:17.576: W/System.err(25028): at dalvik.system.NativeStart.main(Native Method)
解决方法:
追加到ObjectOutputStream不能立即使用,因为它会创建多个标头,如StreamCorruptedException: invalid type code: AC中所述.
有关解决方案,请参见Appending to an ObjectOutputStream.
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