我知道Mule使用元素对数据的gzip压缩提供了极大的支持.但是,客户端现在需要zip压缩,因为该文件必须作为zip压缩文件放置在FTP上：(

我在以下情况下遇到m子困难：

我创建了一个Spring bean,其中包含文件.我想使用ZipOutputStream类压缩此文件,并将其传递给我们的ftp.

这是我的流程配置：

<flow name="testFlow" initialState="stopped">
    <file:inbound-endpoint path="${home.dir}/out" moveToDirectory="${hip.dir}/out/hist" fileAge="10000" responseTimeout="10000" connector-ref="input"/>
    <component>
        <spring-object bean="zipCompressor"/>
    </component>
    <set-variable value="#[message.inboundProperties.originalFilename]" variableName="originalFilename" />
    <ftp:outbound-endpoint  host="${ftp.host}" port="${ftp.port}" user="${ftp.username}" password="${ftp.password}" path="${ftp.root.out}" outputPattern="#[flowVars['originalFilename']].zip" />
</flow>

这是我的zipCompressor的代码：

@Component
public class ZipCompressor implements Callable {

    private static final Logger LOG = LogManager.getLogger(ZipCompressor.class.getName());

    @Override
    @Transactional
    public Object onCall(MuleEventContext eventContext)  throws Exception {

        if (eventContext.getMessage().getPayload() instanceof File) {
            final File srcFile = (File) eventContext.getMessage().getPayload();
            final String fileName = srcFile.getName();
            final File zipFile = new File(fileName + ".zip");

            try {

                // create byte buffer
                byte[] buffer = new byte[1024];
                FileOutputStream fos = new FileOutputStream(zipFile);
                ZipOutputStream zos = new ZipOutputStream(fos);
                FileInputStream fis = new FileInputStream(srcFile);
                // begin writing a new ZIP entry, positions the stream to the start of the entry data
                zos.putNextEntry(new ZipEntry(srcFile.getName()));
                int length;
                while ((length = fis.read(buffer)) > 0) {
                    zos.write(buffer, 0, length);
                }
                zos.closeEntry();
                // close the InputStream
                fis.close();
                // close the ZipOutputStream
                zos.close();
            }
            catch (IOException ioe) {
                LOG.error("Error creating zip file" + ioe);
            }
            eventContext.getMessage().setPayload(zipFile);
        }
        return eventContext.getMessage();
     }
 }

我编写了单元测试,压缩效果很好.实际上,已经使用正确的名称将文件传输到FTP,但是zip文件无效,并且通过在NotePad中打开它,它仅包含原始文件名.

我认为将zip文件传回m子流程时做错了事,但此刻我被困住了,因此不胜感激！

解决方法:

我已经为此实现了变压器

    package com.test.transformer;

import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import org.apache.commons.io.IOUtils;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.mule.api.MuleMessage;
import org.mule.api.transformer.TransformerException;
import org.mule.transformer.AbstractMessageTransformer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ZipTransformer
  extends AbstractMessageTransformer
{
  private static final Logger log = LoggerFactory.getLogger(ZipTransformer.class);
  public static final int DEFAULT_BUFFER_SIZE = 32768;
  public static byte[] MAGIC = { 'P', 'K', 0x3, 0x4 };

  public ZipTransformer()
  {
    registerSourceType(InputStream.class);
    registerSourceType(byte[].class);
  }

  public Object transformMessage(MuleMessage message, String outputEncoding)
    throws TransformerException
  {
    Object payload = message.getPayload();
    try{
        byte[] data;
        if (payload instanceof byte[])
        {
            data = (byte[]) payload;
        }
        else if (payload instanceof InputStream) {
            data = IOUtils.toByteArray((InputStream)payload);
        } 
        else if (payload instanceof String)
        {
            data = ((String) payload).getBytes(outputEncoding);
        }
        else
        {
            data = muleContext.getObjectSerializer().serialize(payload);
        }
        return compressByteArray(data);
    }catch (Exception ioex)
    {
        throw new TransformerException(this, ioex);
    }
  }

  public Object compressByteArray(byte[] bytes) throws IOException
  {
      if (bytes == null || isCompressed(bytes))
      {
          if (logger.isDebugEnabled())
          {
              logger.debug("Data already compressed; doing nothing");
          }
          return bytes;
      }

      if (logger.isDebugEnabled())
      {
          logger.debug("Compressing message of size: " + bytes.length);
      }

      ByteArrayOutputStream baos = null;
      ZipOutputStream  zos = null;

      try
      {
          baos = new ByteArrayOutputStream(DEFAULT_BUFFER_SIZE);
          zos = new ZipOutputStream(baos);
          zos.putNextEntry(new ZipEntry("test.txt"));
          zos.write(bytes, 0, bytes.length);
          zos.finish();
          zos.close();

          byte[] compressedByteArray = baos.toByteArray();

          baos.close();
          if (logger.isDebugEnabled())
          {
              logger.debug("Compressed message to size: " + compressedByteArray.length);
          }

          return compressedByteArray;
      }
      catch (IOException ioex)
      {
          throw ioex;
      }
      finally
      {
          IOUtils.closeQuietly(zos);
          IOUtils.closeQuietly(baos);
      }
  }

  public boolean isCompressed(byte[] bytes) throws IOException
  {
      if ((bytes == null) || (bytes.length < 4 ))
      {
          return false;
      }
      else
      {
          for (int i = 0; i < MAGIC.length; i++) {
                if (bytes[i] != MAGIC[i]) {
                 return false;
                }
          }
          return true;
      }
  }


}

用作

<custom-transformer class="com.test.transformer.ZipTransformer" doc:name="file zip transformer"/>

截至目前,将文件名设置为test.txt.您可以更改使用任何属性或变量.

希望这可以帮助.