我有一个 zip 文件，我将它作为 blob 字段存储在数据库中。当我想从中下载它时，zip 文件已损坏。我只能从 7zip 打开它。当我尝试在将文件上传到数据库之前打开它以及何时在数据库中时，该文件是好的。当我从数据库中以 blob 形式检索文件时，尝试在 unix 上解压缩时出现此错误
Archive: test.zip
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of test.zip or
test.zip.zip, and cannot find test.zip.ZIP, period.
这是我从数据库中检索 zip 时的代码：
public oracle.sql.BLOB GetBlob(Connection myConn,
CallableStatement cstmt) throws Exception {
String strSql = null;
BLOB tempBlob = null;
try {
strSql = .... // Here is the sql procedure which I called to retrieve the blobl field.
cstmt = myConn.prepareCall(strSql);
cstmt.registerOutParameter(1, OracleTypes.BLOB);
cstmt.setLong(2, request_id);
cstmt.execute();
tempBlob = (oracle.sql.BLOB)cstmt.getObject(1);
int bufsize = tempBlob.getBufferSize();
} catch (Exception e) {
e.printStackTrace();
throw e;
}
return tempBlob;
这是阅读：
oracle.sql.BLOB tempBlob = null;
Connection myConn = null;
CallableStatement cstmt = null;
try {
myConn = DBHelper.getConnection();
if (null == myConn)
throw new SQLException();
tempBlob = GetBlob(myConn, cstmt);
int bufsize = tempBlob.getBufferSize();
InputStream in = tempBlob.getBinaryStream();
int length = 0;
byte buf[] = new byte[bufsize];
while ((in != null) && ((length = in.read(buf)) != -1)) {
out.write(buf, 0, length);
}
in.close();
// out.flush();
// out.close();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != myConn) {
try {
myConn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
if (cstmt != null) {
try {
cstmt.close();
} catch (SQLException e) {
}
}
}
有人可以帮助我。
提前致谢。