Java 使用JMimeMagic进行MIME类型检查-MagicMatchNotFoundException
我需要检查MIME类型的当前文件。如果结果为success且文件具有MIME类型,则返回true。如果没有检查成功Java 使用JMimeMagic进行MIME类型检查-MagicMatchNotFoundException,java,exception,mime-types,Java,Exception,Mime Types,我需要检查MIME类型的当前文件。如果结果为success且文件具有MIME类型,则返回true。如果没有检查成功返回false 我用这个目标。 我试着这么做 此代码的输出为-net.sf.jmimemagic.MagicMatchNotFoundException 您需要有jdk7-才能以这种方式将文件更改为字节[](Files.readAllBytes(path)) 代码: class ProbeContentTypeCheker implements Checker {
返回false
我用这个目标。
我试着这么做 此代码的输出为-
net.sf.jmimemagic.MagicMatchNotFoundException
您需要有jdk7-才能以这种方式将文件更改为字节[](Files.readAllBytes(path)
)
代码:
class ProbeContentTypeCheker implements Checker {
@Override
public boolean check(File currentFile) {
String mimeType = null;
try {
Path path = Paths.get(currentFile.getAbsolutePath());
byte[] data = Files.readAllBytes(path);
MagicMatch match = Magic.getMagicMatch(data);
mimeType = match.getMimeType();
} catch (MagicParseException | MagicMatchNotFoundException
| MagicException | IOException e) {
e.printStackTrace();
}
if (null != mimeType) {
return true;
}
return false;
}
}
输出(仅当其类型“错误”时):
net.sf.jmimemagic.MagicMatchNotFoundException
at net.sf.jmimemagic.Magic.getMagicMatch(Magic.java:222)
at net.sf.jmimemagic.Magic.getMagicMatch(Magic.java:170)
at task.ProbeContentTypeCheker.check(FileScan.java:357)
at task.FolderScan.findFiles(FileScan.java:223)
at task.FolderScan.findFiles(FileScan.java:215)
at task.FolderScan.run(FileScan.java:202)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
如果文件为“ok”类型=>输出到控制台正常。但过了一段时间,又出现了一个例外:
Exception in thread "pool-1-thread-1" java.lang.OutOfMemoryError: Java heap space
at java.lang.String.toCharArray(String.java:2753)
at org.apache.oro.text.perl.Perl5Util.match(Unknown Source)
at net.sf.jmimemagic.MagicMatcher.testRegex(MagicMatcher.java:663)
at net.sf.jmimemagic.MagicMatcher.testInternal(MagicMatcher.java:433)
at net.sf.jmimemagic.MagicMatcher.test(MagicMatcher.java:341)
at net.sf.jmimemagic.Magic.getMagicMatch(Magic.java:208)
at net.sf.jmimemagic.Magic.getMagicMatch(Magic.java:170)
at task.ProbeContentTypeCheking.check(FileScan.java:384)
at task.FolderScan.findFiles(FileScan.java:228)
at task.FolderScan.findFiles(FileScan.java:225)
at task.FolderScan.findFiles(FileScan.java:225)
at task.FolderScan.run(FileScan.java:209)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
问题:
net.sf.jmimemagic.MagicMatchNotFoundException
at net.sf.jmimemagic.Magic.getMagicMatch(Magic.java:222)
at net.sf.jmimemagic.Magic.getMagicMatch(Magic.java:170)
at task.ProbeContentTypeCheker.check(FileScan.java:357)
at task.FolderScan.findFiles(FileScan.java:223)
at task.FolderScan.findFiles(FileScan.java:215)
at task.FolderScan.run(FileScan.java:202)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
- 如何解决这一异常问题
net.sf.jmimemagic
的日志级别设置为DEBUG,以获取有关正在进行的操作的更多信息
更新2-OutOfMemoryError
OOM看起来与JmimeMagic的行为有关。在某些情况下,它会尝试对整个字节数组输入运行正则表达式,以找到幻数匹配。有关Nuxeo企业平台,请参阅此报告。我认为可以通过限制传递给
getMagicMatch
Doescommons-logging-1.0.4.jarmeanslog4j1.2.8
?我添加了库commons-logging-1.1.jar
。输出到控制台(红色):Мааimk 112013 2:00:36 PM net.sf.jmimemagic.MagicParser-endElement信息:endElement():不添加无效的匹配器“320 kBits”
NoClassDefFoundError:org/apache/oro/text/perl/Perl5Util
您需要添加我在回答中指定的所有其他库。请仅为每个“坏”文件向问题添加完整的堆栈跟踪。如果它是“ok”文件=>以正常方式输出。结果是java.lang.OutOfMemoryError:java堆空间
。为什么会发生这种情况?