Question

（首先我是新来的，我的英语不是很好，所以我想为我糟糕的写作技巧道歉）

我正在开发一个Android proyect，它从公共FTP服务器读取一些.zip文件并从中获取内容。我正在使用org.apache.commons.net.ftp库连接到ftp。

我可以列出服务器上的所有.zip文件，但是当我尝试列出内容时，我开始遇到问题。有些文件很好，但在某些情况下我无法阅读整个zip文件。

这是我用来连接到ftp的代码的一部分：

private static final String TAG = "MyFTPClient";
public FTPClient mFTPClient = null; 

//Method to connect to FTP server:
public boolean ftpConnect(String host, String username, String password, int port) {
    try {
        mFTPClient = new FTPClient();        
        // connecting to the host
        mFTPClient.connect(host);
        // now check the reply code, if positive mean connection success
        if (FTPReply.isPositiveCompletion(mFTPClient.getReplyCode())) {
            // login using username & password
            boolean status = mFTPClient.login(username, password);
            /* Set File Transfer Mode
             *
             * To avoid corruption issue you must specified a correct
             * transfer mode, such as ASCII_FILE_TYPE, BINARY_FILE_TYPE,
             * EBCDIC_FILE_TYPE .etc. Here, I use BINARY_FILE_TYPE
             * for transferring text, image, and compressed files.
            */
            mFTPClient.setFileType(FTP.ASCII_FILE_TYPE);
            mFTPClient.enterLocalPassiveMode();

            return status;

        }
    } catch(Exception e) {
        Log.d(TAG, "Error: could not connect to host " + host );
        Log.d(TAG, e.toString());
    }

    return false;
}

这是我用来列出.zips文件名的代码：

    public ArrayList<String> ftpZipRetrieveFilesTitles(String filePath) throws IOException{
    ZipInputStream zis = null;
    ArrayList<String> fitxIzenak = new ArrayList<String>();
    try {
         zis = new ZipInputStream(mFTPClient.retrieveFileStream(filePath));
         ZipEntry ze;
         while ((ze = zis.getNextEntry()) != null) {
             String filename = ze.getName();
             fitxIzenak.add(filename);
         }                   
         zis.close();
         mFTPClient.completePendingCommand();
         return fitxIzenak;

    } catch (Exception e) {
        zis.close();
        mFTPClient.completePendingCommand();
        e.printStackTrace();
    }

    return fitxIzenak;
}

这就是我得到的：

java.util.zip.ZipException: CRC mismatch
    at java.util.zip.ZipInputStream.readAndVerifyDataDescriptor(ZipInputStream.java:208)
    at java.util.zip.ZipInputStream.closeEntry(ZipInputStream.java:172)
    at java.util.zip.ZipInputStream.getNextEntry(ZipInputStream.java:225)
    at com.example.services.MyFTPClient.ftpZipRetrieveFromFiles(MyFTPClient.java:250)
    at com.example.gipuzkoabidaian.MainActivity$FTPkonexioa.doInBackground(MainActivity.java:965)
    at com.example.gipuzkoabidaian.MainActivity$FTPkonexioa.doInBackground(MainActivity.java:1)
    at android.os.AsyncTask$2.call(AsyncTask.java:287)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
    at java.lang.Thread.run(Thread.java:856)

 java.util.zip.ZipException: data error
    at java.util.zip.ZipInputStream.read(ZipInputStream.java:340)
    at libcore.io.Streams.skipByReading(Streams.java:158)
    at java.util.zip.InflaterInputStream.skip(InflaterInputStream.java:217)
    at libcore.io.Streams.skipAll(Streams.java:133)
    at java.util.zip.ZipInputStream.closeEntry(ZipInputStream.java:152)
    at java.util.zip.ZipInputStream.getNextEntry(ZipInputStream.java:225)
    at com.example.services.MyFTPClient.ftpZipRetrieveFilesTitles(MyFTPClient.java:303)
    at com.example.gipuzkoabidaian.MainActivity$FTPkonexioa.doInBackground(MainActivity.java:961)
    at com.example.gipuzkoabidaian.MainActivity$FTPkonexioa.doInBackground(MainActivity.java:1)
    at android.os.AsyncTask$2.call(AsyncTask.java:287)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
    at java.lang.Thread.run(Thread.java:856)

我希望有人能帮助我，我不知道该怎么做。

Answer 1

最后我自己找到了解决方案。（我不确定我是否必须在这里写下答案......）

我唯一改变的是在“ftpconnect”函数中传输的文件类型：

mFTPClient.setFileType(FTP.BINARY_FILE_TYPE);

我不太确定原因，无论如何，我在这里找到了一些解释： FTP Client - setFileType

Android解压缩文件从ftp抛出“数据错误”和“CRC不匹配”错误

1 个答案: