GZip流的使用非常多人都出现了以下的异常:java.io.EOFException: Unexpected end of ZLIB input stream。或者出现压缩后的数据不全的情况(就是压缩的数据仅仅是原数据的一部分,不能被解压缩)
原因是在使用GZIPOutputStream 对象的时候没有调用close方法.
如:
@org.junit.Test
public void test(){
try {
ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();
byte[] original="asdfasfasfasfsafsadfasfasfasfasfasdfasdasfsasdfasfsafsafsadsafsadsadfasffasdfsafdasf!".getBytes();
System.out.println("original:"+original.length);
//byteArrayOutputStream.write(original);
GZIPOutputStream gzipOutputStream=new GZIPOutputStream(byteArrayOutputStream);
gzipOutputStream.write(original);
//这里一定要先把gzipOutputStream流关闭了,否则得到的是部分数据,而且以下在解压缩的时候会出现EOFException异常
gzipOutputStream.close();
byteArrayOutputStream.close();
byte[] compressByteArray = byteArrayOutputStream.toByteArray();
System.out.println("compress:"+compressByteArray.length);
//解压缩
GZIPInputStream gunzip = new GZIPInputStream(new ByteArrayInputStream(compressByteArray));
ByteArrayOutputStream compressByteArrayOut=new ByteArrayOutputStream();
byte[] buffer=new byte[4096];
int temp=-1;
while((temp=gunzip.read(buffer))>0){
compressByteArrayOut.write(buffer, 0, temp);
}
byte[] unCompressByte = compressByteArrayOut.toByteArray();
System.out.println("uncompress:"+unCompressByte.length);
gunzip.close();
compressByteArrayOut.close();
} catch (Exception e) {
e.printStackTrace();
}
}
上面的代码假设没有调用:gzipOutputStream.close(); 程序将会出现:java.io.EOFException: Unexpected end of ZLIB input stream。
java.io.EOFException: Unexpected end of ZLIB input stream
at java.util.zip.InflaterInputStream.fill(InflaterInputStream.java:240)
at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:158)
at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:116)
at java.io.FilterInputStream.read(FilterInputStream.java:107)
at com.searow.test.Object2ByteArray.test(Object2ByteArray.java:145)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
正确的执行结果:
original:87
compress:57
uncompress:87