Question

我要求将docx / pdf文件作为电子邮件发送。所以我将文件作为二进制字符串从ajax发送到Java Servlet＆amp;将其转换为InputStream＆amp;然后将它作为ByteArray传递给ByteArrayDataSource。我收到附件的电子邮件，但pdf文件为空。以下是代码： -

Ajax：

var reader = new FileReader();
            reader.onload = function () {
                $.ajax({
                    url: 'SendAttachments',
                    type: 'POST',
                    data: jQuery.param({positionApllied:"tester",
                        Name:"John",
                        fileName:"invoice.pdf",
                        fileType:"application/pdf",
                        attachment:reader.result}),
                    success: function(data, textStatus, jqXHR)
                    {},
                    error: function(jqXHR, textStatus, errorThrown)
                    {}
                })
            }
            reader.readAsBinaryString(file)

Java Servlet：

    String filecontent =  request.getParameter("attachment");
    InputStream stream = new ByteArrayInputStream(filecontent.getBytes("UTF-8"));

    byte[] bucket = new byte[32*1024]; 
    ByteArrayOutputStream result = null; 
    try  {
      try {
        result = new ByteArrayOutputStream(bucket.length);
        int bytesRead = 0;
        while(bytesRead != -1){
          bytesRead = stream.read(bucket);
          if(bytesRead > 0){
            result.write(bucket, 0, bytesRead);
          }
        }
      }
      finally {
          stream.close();
      }
    }
    catch (IOException ex){
    }


    ByteArrayDataSource source = new ByteArrayDataSource(result.toByteArray(), fileMime);

Answer 1

我找到了解决方案。而不是使用reader.readAsBinaryString（file），请使用reader.readAsDataURL（file）。并将参数传递为

data: jQuery.param({positionApllied:applied,
                        cName:cname,
                        fileName:fname,
                        fileType:ftype,
                        attachment:reader.result.split(",")[1]}),

在Java中，解码字符串。

String filecontent =  request.getParameter("attachment");

    byte[] decodedBytes = Base64.decode(filecontent);

    InputStream stream = new ByteArrayInputStream(decodedBytes);

    byte[] bucket = new byte[32*1024]; 
    ByteArrayOutputStream result = null; 
    try  {
      try {
        result = new ByteArrayOutputStream(bucket.length);
        int bytesRead = 0;
        while(bytesRead != -1){
          bytesRead = stream.read(bucket);
          if(bytesRead > 0){
            result.write(bucket, 0, bytesRead);
          }
        }
      }
      finally {
          stream.close();
      }
    }
    catch (IOException ex){
    }

    ByteArrayDataSource source = new ByteArrayDataSource(result.toByteArray(), fileMime);

将BinaryString转换为ByteArray - Java

1 个答案: