java - Mandrill/Java - 附件损坏

Question

我试图使用 Mandrill Wrapper for Java 来附加电子邮件中的文件。这是我处理附件文件的代码。

public byte[] attachmentContent(String filepath)
{
    Path path = Paths.get(filepath);
    byte[] data = null;
    try {
        data = Files.readAllBytes(path);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return data;
}

    //adding attachment
    ArrayList<MandrillAttachment> attachedFiles = new ArrayList<MandrillAttachment>();
    //file 1
    String attType = "application/pdf";
    String attName = "Indian License.pdf";
    String attContent = Base64.encodeBase64URLSafeString(attachmentContent("C:\\LL Indian License.pdf"));
    System.out.println(attContent);
    //attach
    attachedFiles.add(new MandrillAttachment(attType, attName, attContent));
    message.setAttachments(attachedFiles);

但是，文件在发送过程中不断损坏。知道如何解决这个问题吗？

Answer 1

(回答这个问题可能为时已晚)使用 Base64 的正确编码可以避免此问题。我使用以下代码解决了这个问题。

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.codec.binary.Base64;

List<MessageContent> listofAttachments = new ArrayList<MessageContent>();
    MessageContent attachment = new MessageContent();
    attachment.setType("application/pdf");
    attachment.setName("Test.pdf");

    File file = new File("C:\\Users\\xxx\\PdfTesting\\Test.pdf");

    InputStream is = new FileInputStream(file);

    long length = file.length();
    if (length > Integer.MAX_VALUE) {
        // File is too large
    }
    byte[] bytes = new byte[(int) length];

    int offset = 0;
    int numRead = 0;
    while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
        offset += numRead;
    }

    if (offset < bytes.length) {
        throw new IOException("Could not completely read file " + file.getName());
    }

    is.close();
    byte[] encoded = Base64.encodeBase64(bytes);
    String encodedString = new String(encoded);
    attachment.setContent(encodedString);