Java PNGEException“;“crc腐败”;尝试从ZIP存档创建ImageIcon对象时
我有一个包含大量PNG图像的ZIP文件,我正试图将这些图像作为ImageIcon资源直接从存档加载到Java应用程序中。这是我的密码:Java PNGEException“;“crc腐败”;尝试从ZIP存档创建ImageIcon对象时,java,swing,zip,awt,Java,Swing,Zip,Awt,我有一个包含大量PNG图像的ZIP文件,我正试图将这些图像作为ImageIcon资源直接从存档加载到Java应用程序中。这是我的密码: import java.io.*; import java.util.Enumeration; import java.util.zip.*; import javax.swing.ImageIcon; public class Test { public static void main( String[] args ) { if( args
import java.io.*;
import java.util.Enumeration;
import java.util.zip.*;
import javax.swing.ImageIcon;
public class Test {
public static void main( String[] args )
{
if( args.length == 0 )
{
System.out.println("usage: java Test.java file.zip");
return;
}
File archive = new File( args[0] );
if( !archive.exists() || !archive.canRead() )
{
System.err.printf("Unable to find/access %s.\n", archive);
return;
}
try {
ZipFile zip = new ZipFile(archive);
Enumeration <? extends ZipEntry>e = zip.entries();
while( e.hasMoreElements() )
{
ZipEntry entry = (ZipEntry) e.nextElement();
int size = (int) entry.getSize();
int count = (size % 1024 == 0) ? size / 1024 : (size / 1024)+1;
int offset = 0;
int nread, toRead;
byte[] buffer = new byte[size];
for( int i = 0; i < count; i++ )
{
offset = 1024*i;
toRead = (size-offset > 1024) ? 1024 : size-offset;
nread = zip.getInputStream(entry).read(buffer, offset, toRead);
}
ImageIcon icon = new ImageIcon(buffer); // boom -- why?
}
zip.close();
} catch( IOException ex ) {
System.err.println(ex.getMessage());
}
}
}
有人能解释一下吗?谷歌还没有找到任何有用的信息。你可能必须退出内部循环,而不是对每个块重复调用它。这就解决了它!(嗯,不完全是这样,但至少我的测试用例现在没有崩溃)。我想知道它为什么起作用?我怀疑每次调用getInputStream()时都会重置指针,所以我实际上是在反复读取PNG的前1024个字节。谢谢我认为这是“你必须拉”,而不仅仅是“你可能”。看起来getInputStream()每次调用都返回不同的流,因此每次调用read()时,它都从流的开头开始读取!在结尾,缓冲区只包含PNG文件的前1KB,重复了很多次@jfpoilpret&@Nathan Strong:看一下
getInputStream()
的源代码,你们都是对的!
sun.awt.image.PNGImageDecoder$PNGException: crc corruption
at sun.awt.image.PNGImageDecoder.getChunk(PNGImageDecoder.java:699)
at sun.awt.image.PNGImageDecoder.getData(PNGImageDecoder.java:707)
at sun.awt.image.PNGImageDecoder.produceImage(PNGImageDecoder.java:234)
at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:246)
at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:172)
at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)
sun.awt.image.PNGImageDecoder$PNGException: crc corruption
at sun.awt.image.PNGImageDecoder.getChunk(PNGImageDecoder.java:699)
at sun.awt.image.PNGImageDecoder.getData(PNGImageDecoder.java:707)
at sun.awt.image.PNGImageDecoder.produceImage(PNGImageDecoder.java:234)
at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:246)
at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:172)
at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)