在java中读取Zip文件内容而不进行解压缩

在java中读取Zip文件内容而不进行解压缩,java,zipfile,truezip,Java,Zipfile,Truezip,我有byte[]zipFileAsByteArray This zip file has rootDir --| | --- Folder1 - first.txt | --- Folder2 - second.txt | --- PictureFolder - image.png 我需要的是得到两个txt文件并读取它们

我有byte[]zipFileAsByteArray

This zip file has rootDir --|
                            | --- Folder1 - first.txt
                            | --- Folder2 - second.txt  
                            | --- PictureFolder - image.png  
我需要的是得到两个txt文件并读取它们,而不在磁盘上保存任何文件。就在记忆中做吧

我试过这样的方法:

ByteArrayInputStream bis = new ByteArrayInputStream(processZip);
ZipInputStream zis = new ZipInputStream(bis);
public byte[]image getImage(byte[] zipContent);
此外,我需要有单独的方法去得到图片。大概是这样的:

ByteArrayInputStream bis = new ByteArrayInputStream(processZip);
ZipInputStream zis = new ZipInputStream(bis);
public byte[]image getImage(byte[] zipContent);
有人能帮我提供一些想法或好的例子吗?

以下是一个例子:

public static void main(String[] args) throws IOException {
    ZipFile zip = new ZipFile("C:\\Users\\mofh\\Desktop\\test.zip");


    for (Enumeration e = zip.entries(); e.hasMoreElements(); ) {
        ZipEntry entry = (ZipEntry) e.nextElement();
        if (!entry.isDirectory()) {
            if (FilenameUtils.getExtension(entry.getName()).equals("png")) {
                byte[] image = getImage(zip.getInputStream(entry));
                //do your thing
            } else if (FilenameUtils.getExtension(entry.getName()).equals("txt")) {
                StringBuilder out = getTxtFiles(zip.getInputStream(entry));
                //do your thing
            }
        }
    }


}

private  static StringBuilder getTxtFiles(InputStream in)  {
    StringBuilder out = new StringBuilder();
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    String line;
    try {
        while ((line = reader.readLine()) != null) {
            out.append(line);
        }
    } catch (IOException e) {
        // do something, probably not a text file
        e.printStackTrace();
    }
    return out;
}

private static byte[] getImage(InputStream in)  {
    try {
        BufferedImage image = ImageIO.read(in); //just checking if the InputStream belongs in fact to an image
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(image, "png", baos);
        return baos.toByteArray();
    } catch (IOException e) {
        // do something, it is not a image
        e.printStackTrace();
    }
    return null;
}

请记住,虽然我正在检查字符串以区分可能的类型,但这很容易出错。没有任何东西可以阻止我发送另一种具有预期扩展名的文件。

您可以执行以下操作:

public static void main(String args[]) throws Exception
{
    //bis, zis as you have
    try{
        ZipEntry file;
        while((file = zis.getNextEntry())!=null) // get next file and continue only if file is not null
        {
            byte b[] = new byte[(int)file.getSize()]; // create array to read.
            zis.read(b); // read bytes in b
            if(file.getName().endsWith(".txt")){
                // read files. You have data in `b`
            }else if(file.getName().endsWith(".png")){
                // process image
            }
        }
    }
    finally{
        zis.close();
    }
}

我想你要找的东西可以在:。对于与图像相关的内容,您应该可以通过以下内容来完成:。为了检测是否调用getImage方法,请检查文件的扩展名。我没有ZipFile zip=new ZipFile(“C:\\Users\\mofh\\Desktop\\test.zip”);我的条目是ZipInputStream zis=新的ZipInputStream(bis);那就简单地使用它吧。。。如果您有zip的字节[],只需
ZipFile zip=new ZipInputStream(new ByteArrayInputStream(processZip))
@dambros将更好地使用try with resources for zip文件:
try(ZipFile zip=…){
file.getSize()return-1;