java - 如何将元素添加到具有模型类型的列表中

Question

我是java新手。我想向列表添加一个元素。

List<RequestAttachmentDTO> attachments

RequestAttachmentDTO 类在这里，

public class RequestAttachmentDTO {

    byte[] contentStream;
    String fileName;
    String contentType;
    String contentTransferEncoding;


    public RequestAttachmentDTO(byte[] contentStream, String fileName, String contentType) {
        this.contentStream = contentStream;
        this.fileName = fileName;
        this.contentType = contentType;
    }

    public RequestAttachmentDTO(byte[] contentStream, String fileName, String contentType,String contentTransferEncoding) {
        this.contentStream = contentStream;
        this.fileName = fileName;
        this.contentType = contentType;
        this.contentTransferEncoding=contentTransferEncoding;
    }

    public String getFileName() {
        return fileName;
    }

    public String getContentType() {
        return contentType;
    }

    public byte[] getContentStream() {
        return contentStream;
    }

    public String getContentTransferEncoding() {
        return contentTransferEncoding;
    }

}

这就是我尝试添加的方式，

String fieldName = item.getFieldName();
            String fiileName = FilenameUtils.getName(item.getName());
            fileContent = item.getInputStream();                
            Path path = Paths.get("/data/uploads/form_urlencoded_simple_decoded_body.txt");
            byte[] data = Files.readAllBytes(path);

            List<RequestAttachmentDTO> attachments = new ArrayList<>();
            attachments.add(data,fieldName,"application/x-www-form-urlencoded");

它不接受它。

PS:- 文件 item 是从 JSP 页面以 multipart/form-data 编码上传的。

你能帮我向这个列表添加元素吗？谢谢。

Answer 1

欢迎使用 Java!

当前您尚未创建 RequestAttachmentDTO 对象，为此，您需要调用此构造函数 RequestAttachmentDTO(byte[] contentStream, String fileName, String contentType)正确的值。

因此，要解决此问题，请将 attachments.add(data,fieldName,"application/x-www-form-urlencoded"); 行更改为 attachments.add(new RequestAttachmentDTO(数据，fieldName，“application/x-www-form-urlencoded”));