Java：合并2个Zip文件

Question

我目前正在开发一个程序，它一度必须合并两个.zip文件（originalZip和newZip应该合并到moddedZip，newZip覆盖文件，如果它们已经存在的话）。由于我在之前的任何项目中都没有使用.zip文件，因此我搜索了一段时间，直到找到this。虽然它只是附加单个文件，但我认为我能够使用它来合并文件。

这就是我现在所拥有的：

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class ModZip {   
    // 4MB buffer
    private static final byte[] BUFFER = new byte[4096 * 1024];

    // copy input to output stream   
    public static void copy(InputStream input, OutputStream output) throws IOException {
        int bytesRead;
        while ((bytesRead = input.read(BUFFER))!= -1) {
            output.write(BUFFER, 0, bytesRead);
        }
    }

    public static void patch(String path) throws Exception {
        // read the original zip
        ZipFile originalZip = new ZipFile(path);


        // write the modded zip with new Name
        ZipOutputStream moddedZip = new ZipOutputStream(new FileOutputStream(path.substring(0, (path.length()-4))+"-modded.zip"));

        // copy contents from original zip to the modded zip
        Enumeration<? extends ZipEntry> entries = originalZip.entries();
        while (entries.hasMoreElements()) {
            ZipEntry e = entries.nextElement();
            System.out.println("copy: " + e.getName());
            moddedZip.putNextEntry(e);
            System.out.println("putnextEntry done");
            if (!e.isDirectory()) {
                copy(originalZip.getInputStream(e), moddedZip);
            }
            moddedZip.closeEntry();
        }

        // replace the original zip-files with new ones       
        ZipFile newZip = new ZipFile("/Users/user/Desktop/NEW.zip");
        Enumeration<? extends ZipEntry> newentries = newZip.entries();
        System.out.println(newentries);
        while (newentries.hasMoreElements()) {
            ZipEntry e = newentries.nextElement();
            System.out.println("append: " + e.getName());
            moddedZip.putNextEntry(e);
            System.out.println("putnextEntry done");
            if (!e.isDirectory()) {
                copy(newZip.getInputStream(e), moddedZip);
            }
            moddedZip.closeEntry();
        }

        System.out.println("appending done ");

        // close
        originalZip.close();
        newZip.close();
        moddedZip.close();
        System.out.println("all done");
    }
}

将originalZip复制到moddedZip工作正常，但是在追加第一个条目，即newZip的文件（不是目录）后，程序似乎崩溃了。我没有得到任何例外，它似乎没有继续。（忘记打印堆栈跟踪），它停止因为它拒绝覆盖现有文件。

这是syso：

  

copy：test.txt

     

putnextEntry完成

     

复制：__ MACOSX /

     

putnextEntry完成

     

复制：__ MACOSX /._ test.txt

     

putnextEntry完成

     

java.util.zip.ZipFile$1@1fa83e7e

     

追加：item /

     

putnextEntry完成

     

追加：item / .DS_Store

     

putnextEntry完成

     

追加：__ MDOSX /

此致 DNSYeti

编辑： 感谢jlordo我能够自己解决问题，这是新代码：

复制原始.zip文件时，它会检查它包含的任何元素是否也在新的.zip文件中。如果是，则不会将它们复制到修改后的.zip文件中（因此我不必在覆盖它们时再次删除它们。）

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class ModZip {   
    // 4MB buffer
    private static final byte[] BUFFER = new byte[4096 * 1024];

    // copy input to output stream   
    public static void copy(InputStream input, OutputStream output) throws IOException {
        int bytesRead;
        while ((bytesRead = input.read(BUFFER))!= -1) {
            output.write(BUFFER, 0, bytesRead);
        }
    }

    public static void patch(String path) throws Exception {
        // read the zips
        ZipFile originalZip = new ZipFile(path);
        ZipFile newZip = new ZipFile("/Users/user/Desktop/NEW.zip");


        // write the modded zip with new Name
        ZipOutputStream moddedZip = new ZipOutputStream(new FileOutputStream(path.substring(0, (path.length()-4))+"-modded.zip"));

        // copy contents from original zip to the modded zip
        Enumeration<? extends ZipEntry> entries = originalZip.entries();
        while (entries.hasMoreElements()) {
            ZipEntry e = entries.nextElement();

            String name = e.getName();
            if(newZip.getEntry(name) == null) {
                System.out.println("copy: " + e.getName());
                moddedZip.putNextEntry(e);
                System.out.println("putnextEntry done");
                if (!e.isDirectory()) {
                    copy(originalZip.getInputStream(e), moddedZip);
                }
                moddedZip.closeEntry();
            }
        }

        // replace the original zip-files with new ones       

        Enumeration<? extends ZipEntry> newentries = newZip.entries();
        System.out.println(newentries);
        while (newentries.hasMoreElements()) {
            ZipEntry e = newentries.nextElement();
            System.out.println("append: " + e.getName());
            moddedZip.putNextEntry(e);
            System.out.println("putnextEntry done");
            if (!e.isDirectory()) {
                copy(newZip.getInputStream(e), moddedZip);
            }
            moddedZip.closeEntry();
        }

        System.out.println("appending done ");

        // close
        originalZip.close();
        newZip.close();
        moddedZip.close();
        System.out.println("all done");
    }
}