java.io.StreamCorruptedException：无效的流头：4920616D [英] java.io.StreamCorruptedException: invalid stream header: 4920616D

问题描述

嗨当我试图读blob获取异常。我发布如何写入数据库和创建数据库恳请建议，其造成太多的问题..

  ava.io.StreamCorruptedException ：无效的流头：4920616D 
在java.io.ObjectInputStream.readStreamHeader（ObjectInputStream.java:782）
在java.io.ObjectInputStream。< init>（ObjectInputStream.java:279）
在com.jiit.jfx.persistence.TypeHelper.readBlob（TypeHelper.java:137）
在com.jiit.jfx.persistence.TypeHelper.get（TypeHelper.java:84）
在com。 jiit.jfx.persistence.dataaccess.OracleSQLQuery.get（OracleSQLQuery.java:116）
 at com.jiit.jfx.persistence.dataaccess.OracleSQLQuery.doOperation（OracleSQLQuery.java:65）
 at com。 jiit.jfx.persistence.dataaccess.AbstractDAO.execute（AbstractDAO.java:181）
 at com.jiit.jfx.persistence.dataaccess.AbstractDAO.executeSQL（AbstractDAO.java:208）
 at 
 
 com.jiit.ngcs.mx.server.model.rail.ASMMessageStore.getASMMessageStore（ASMMessageStore.java:196）
 
 
 
 
在这里输入代码
 
读取BOLB：
 
 public static Blob createBlob（Object serializable）throws PersistenceException {
 try {
 ByteArrayOutputStream bStream = new ByteArrayOutputStream ; 
 ObjectOutputStream oStream = new ObjectOutputStream（bStream）; 
 oStream.writeObject（serializable）; 
 oStream.flush（）; 
 oStream.close（）; 
 return createBlob（bStream.toByteArray（））; 
} catch（Exception e）{
 throw new PersistenceException（e.getMessage（））; 
} 
} 
 in TypeHelper.java  - > createBlob 
 
 
 private static Object readBlob（int index，ResultSet rs）throws SQLException {
 try {
 InputStream is = rs.getBinaryStream（index）; 
 if（is！= null）{
 ObjectInputStream os = new ObjectInputStream（is）; 
 return os.readObject（）; 
} 
返回null; 
} catch（IOException e）{
 e.printStackTrace（）; 
抛出新的SQLException（e.getMessage（））; 
} catch（ClassNotFoundException e）{
 e.printStackTrace（）; 
抛出新的SQLException（e.getMessage（））; 
} 
  

尝试了所有在stackoverflow和其他博客中给出的例子。仍然不明白确切的问题。

解决方案

让我们从开始4920616D 。如果你解码为ASCII字符，你会得到我是...英文文本。现在，这可能是一个巧合，但让我们假设它不是。

什么可能导致文本出现在您期待序列化对象？

好吧，有一种可能性是您得到的结果集索引值错误。如果结果集中的索引1对应于来自CHAR或VARCHAR或类似字段的值，则JDBC驱动程序可以返回由一串编码文本组成的二进制流。你可以看到这些字符的数字可以用来存储文本，包括ASCII，LATIN-1和UTF-8字符编码方案。

hi When am trying to read blob getting the exception . am posting how am writing into DB and geting to db kindly suggest , its causing too much problem..

ava.io.StreamCorruptedException: invalid stream header: 4920616D
                at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:782)
                at java.io.ObjectInputStream.<init>(ObjectInputStream.java:279)
                at com.jiit.jfx.persistence.TypeHelper.readBlob(TypeHelper.java:137)
                at com.jiit.jfx.persistence.TypeHelper.get(TypeHelper.java:84)
                at com.jiit.jfx.persistence.dataaccess.OracleSQLQuery.get(OracleSQLQuery.java:116)
                at com.jiit.jfx.persistence.dataaccess.OracleSQLQuery.doOperation(OracleSQLQuery.java:65)
                at com.jiit.jfx.persistence.dataaccess.AbstractDAO.execute(AbstractDAO.java:181)
                at com.jiit.jfx.persistence.dataaccess.AbstractDAO.executeSQL(AbstractDAO.java:208)
                at 

com.jiit.ngcs.mx.server.model.rail.ASMMessageStore.getASMMessageStore(ASMMessageStore.java:196)




    enter code here

    Reading BOLB :

        public static Blob createBlob(Object serializable) throws PersistenceException{
            try {
                ByteArrayOutputStream bStream = new ByteArrayOutputStream();
                ObjectOutputStream oStream = new ObjectOutputStream(bStream);
                oStream.writeObject(serializable);
                oStream.flush();
                oStream.close();
                return createBlob(bStream.toByteArray());
            } catch (Exception e) {
                throw new PersistenceException(e.getMessage());
            }
        }
        in TypeHelper.java -- > createBlob


        private static Object readBlob(int index, ResultSet rs) throws SQLException {
            try {
                InputStream is = rs.getBinaryStream(index);
                if(is != null) {
                    ObjectInputStream os = new ObjectInputStream(is);
                    return os.readObject();
                }
                return null;
            } catch (IOException e) {
                e.printStackTrace();
                throw new SQLException(e.getMessage());
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
                throw new SQLException(e.getMessage());
            }

Tried all cases given in stackoverflow and other blogs . still not understand exact issues.

解决方案

Lets start with 4920616D. If you decode that as ASCII characters, you get "I am" ... English text. Now that could be a coincidence, but lets assume that it isn't.

What could cause text to appear where you were expecting a serialized object?

Well, one possibility is that you have gotten the resultset index values wrong. If index 1 in the resultset corresponded to a value from a CHAR or VARCHAR or similar field, then your JDBC driver could return a "binary stream" consisting of a bunch of encoded text. You could see those characters for a number of character encoding schemes that the database could be using for storing text, including ASCII, LATIN-1 and UTF-8.

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