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我正在尝试使用 Zip4J 将来自不同位置的一堆文件压缩到一个 zip 文件夹中。我有一个来自不同文件夹的文件的 ArrayList，当我遍历调用“zip.AddFile（file，params）”的列表时，文件被添加得很好，直到文件来自开关的文件夹。我收到以下错误，

 net.lingala.zip4j.exception.ZipException: java.lang.NullPointerException
        at net.lingala.zip4j.zip.ZipEngine.initAddFiles(ZipEngine.java:187)
        at net.lingala.zip4j.zip.ZipEngine.addFiles(ZipEngine.java:85)
        at net.lingala.zip4j.core.ZipFile.addFiles(ZipFile.java:292)
        at net.lingala.zip4j.core.ZipFile.addFile(ZipFile.java:250)
        at tasks.OutputTask.compressFiles(OutputTask.java:627)
        at tasks.OutputTask.uploadHelper(OutputTask.java:550)
        at tasks.OutputTask.uploadHelper(OutputTask.java:593)
        at tasks.OutputTask.uploadHelper(OutputTask.java:593)
        at tasks.OutputTask.uploadHelper(OutputTask.java:593)
        at tasks.OutputTask.uploadHelper(OutputTask.java:593)
        at tasks.OutputTask.upload(OutputTask.java:516)
        at tasks.OutputTask.call(OutputTask.java:279)
        at tasks.OutputTask.call(OutputTask.java:1)
        at javafx.concurrent.Task$TaskCallable.call(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
    Caused by: java.lang.NullPointerException
        at net.lingala.zip4j.zip.ZipEngine.prepareFileOutputStream(ZipEngine.java:433)
        at net.lingala.zip4j.zip.ZipEngine.removeFilesIfExists(ZipEngine.java:385)
        at net.lingala.zip4j.zip.ZipEngine.initAddFiles(ZipEngine.java:109)
        ... 17 more

代码本身是

        ZipFile zip;
        try {
            System.out.println("Creating zip: " + outputName);
            File zipfile;
            if ((zipfile = new File(outputName)).exists()) {
                zipfile.delete();
            }
            zip = new ZipFile(new File(outputName));

            ZipParameters params = new ZipParameters();
            if (encrypt) {
                params.setEncryptFiles(true);
                params.setEncryptionMethod(Zip4jConstants.ENC_METHOD_AES);
                params.setAesKeyStrength(Zip4jConstants.AES_STRENGTH_256);
                params.setPassword(Property.AES_ENCRYPTION_KEY.getValue());

            }
            params.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
            params.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
            for (File file : sourceFiles) {
                if (file.isFile()) {
                    try {
                        zip.addFile(file, params);
                    } catch (ZipException e) {
                        e.printStackTrace();
                    }
                }
          }

例如，这里是文件列表

文件 = {C:/Folder1/img1, C/Folder1/txtFile, C:/Folder1/jar, C:/Folder2/img2}

代码将正常执行，直到它到达“C:/Folder2/img2”，它将返回上述错误。我努力了

params.setSourceExternalStream(true);

它提供了一个不同的错误，说没有外部源文件的名称。任何帮助将不胜感激。提前致谢

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1 回答 1

0

尝试添加 params.setFileNameInZip(filename); params.setSourceExternalStream(true);

于 2017-09-11T02:49:07.897 回答