java.io.EOFException: Unexpected end of ZLIB input stream异常处理

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java.io.EOFException: Unexpected end of ZLIB input stream异常处理

因需要完成压缩与解压缩功能，所以使用到java.util.zip中的类。同时使用了jdk 1.7 try with resource 的特性，结果暴出java.io.EOFException: Unexpected end of ZLIB input stream异常。

java.io.EOFException: Unexpected end of ZLIB input streamat 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:117)at java.io.FilterInputStream.read(FilterInputStream.java:107)at com.sf.framework.rpc.util.NioUtils.unzip(NioUtils.java:27)at framework.rpc.util.NioUtilsTest.unzipTest(NioUtilsTest.java:24)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:497)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)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)

代码如下：

public class NioUtils {public static byte[] zip(byte[] bytes) {if (bytes != null && bytes.length > 0) {ByteArrayOutputStream byteOs = new ByteArrayOutputStream();try(GZIPOutputStream gZipOs = new GZIPOutputStream(byteOs)) {gZipOs.write(bytes);return byteOs.toByteArray();} catch (IOException e) {e.printStackTrace();}}return new byte[0];}public static byte[] unzip(byte[] bytes){try (GZIPInputStream gZipIs = new GZIPInputStream (new ByteArrayInputStream(bytes));ByteArrayOutputStream bos = new ByteArrayOutputStream()){byte[] buff = new byte[512];int read = gZipIs.read(buff);while(read > 0){bos.write(buff,0,read);read = gZipIs.read(buff);}return bos.toByteArray();} catch (IOException e) {e.printStackTrace();}return new byte[0];}
}@Testpublic void unzipTest(){
//      NioUtils.closeTest();byte[] bytes = str.getBytes();byte[] ziped = NioUtils.zip(bytes);byte[] unziped = NioUtils.unzip(ziped);String unZipedStr = new String(unziped);Assert.assertTrue(str.equals(unZipedStr));}

原本是想里用try-with-resource完成自动close，结果在解压缩获取到的压缩数据时出现异常。随后看了GZIPOutputStream 的源码，原来调用close的时候会填充一些压缩信息，这样才能在解压缩时正常解压缩。而上面的代码，bos.toByteArray();是在bos.close()调用前被调用，因此返回了不正确的字节数组，造成解压缩失败。

下面是执行try-with-resource执行顺序的一个测试。

public class NioUtils {public static T1 closeTest(){try(T t = new T()){return new T1();}catch(Exception e){e.printStackTrace();}return null;}
}class T implements AutoCloseable{@Overridepublic void close() throws Exception {System.out.println("AutoCloseable");}}class T1{T1(){System.out.println("a class for test.");}
}
输出：
a class for test.
AutoCloseable

可以看到close是在return 中new T()调用完后执行。

最后保证在对于解压缩，保证在压缩返回字节数组前close方法被调用即可解决出现的异常。

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