java.io.StreamCorruptedException: invalid type code: AC解决办法
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问题描述:
在向一个文件写入可序列化对象时,每次只想向文件的末尾添加一个可序列化的对象,于是使用了FileOutputStream(文件名,true)间接的构建了ObjectOutputStream流对象,在向外读数据的时候第一次运行的时候不会报错,在第二次就会报java.io.StreamCorruptedException: invalid type code: AC错误。
原因:
在一个文件都有一个文件的头部和文件体。由于对多次使用FileOutputStream(文件名,true)构建的ObjectOutputStream对象向同一个文件写数据,在每次些数据的时候他都会向这个文件末尾先写入header在写入你要写的对象数据,在读取的时候遇到这个在文件体中的header就会报错。导致读出时,出现streamcorrput异常。
解决办法:所以这里要判断是不是第一次写文件,若是则写入头部,否则不写入。
代码示例:
1.ObjectAppendOutputStream.java文件
class ObjectAppendOutputStream extends ObjectOutputStream {public ObjectAppendOutputStream() throws IOException {super();}public ObjectAppendOutputStream(OutputStream out) throws IOException {super(out);}@Overrideprotected void writeStreamHeader() throws IOException {return;}}
2、ObjectToFileUtil
public class ObjectToFileUtil {public static <T> void write(String path, T t) {List<T> ts = new ArrayList<T>();ts.add(t);write(path, ts);}public static <T> void write(String path, List<T> ts) {ObjectOutputStream out = null;try { // 判断文件大小并调用不同的方法File file = new File(path);if (file.exists() == false) {file.createNewFile();}FileOutputStream fos = new FileOutputStream(file, true);if (file.length() < 1) {out = new ObjectOutputStream(fos);} else {out = new ObjectAppendOutputStream(fos);}// 判断文件大小并调用不同的方法for (T t : ts) {out.writeObject(t);}} catch (Exception ex) {ex.printStackTrace();} finally {try {out.close();} catch (IOException e) {e.printStackTrace();}}}public static <T> T readOne(String path){List<T> temp = read(path);if(temp ==null || temp.size() == 0 ){return null;}return temp.get(0);}public static <T> List<T> read(String path){List<T> result = new ArrayList<T>();ObjectInputStream in = null;try {in = new ObjectInputStream(new BufferedInputStream(new FileInputStream(path)));Object temp = null;while ((temp = in.readObject()) != null) {T t = (T)temp;result.add(t);}} catch (EOFException e) {} catch (Exception ex) {ex.printStackTrace();} finally {try {in.close();} catch (IOException e) {e.printStackTrace();}}return result;}public static void main(String[] args) {List<User> list = new ArrayList<User>();list.add(new User("admin", "admin", "123", 1));list.add(new User("zhang", "zhang", "123", 0));list.add(new User("san", "san", "123", 0));String path = "d://abcd.data";ObjectToFileUtil.write(path, list);ObjectToFileUtil.write(path, new User("tian", "tian", "123", 0));List<User> users = ObjectToFileUtil.read(path);for(User u:users){System.out.println(u.name);}}}
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