Selecting multiple files and uploading them using Jersey

问题

I need help with multiple file uploads using Jersey. I used the following code to upload a single file using Jersey.

package my.first.rest;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.ws.rs.Consumes;
import javax.ws.rs.FormParam;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.MediaType;



import com.sun.jersey.core.header.FormDataContentDisposition;
import com.sun.jersey.multipart.FormDataParam;

@Path("uploadfile")
public class Upload {
String location;



    @POST
    @Path("/upload")
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    public  String uploadfile(@FormDataParam("file") InputStream is, @FormDataParam("file") FormDataContentDisposition filedetail){



        saveToDisk(is,filedetail);
        return  "File Uploaded Succesfully_"+location;

    }


    private void saveToDisk(InputStream is1,
            FormDataContentDisposition filedetail) {
        // TODO Auto-generated method stub

         location = "E://upload/"+filedetail.getFileName();
        try{
            OutputStream out = new FileOutputStream(new File(location));
            int read = 0;
            byte[] bytes = new byte[1024];
            out = new FileOutputStream (new File(location));
            while((read = is1.read(bytes)) != -1){
                out.write(bytes,0,read);
            }
            out.flush();

            out.close();
        }catch (IOException e){
            e.printStackTrace();
        }
    }


}

The above code works well with uploading a single file but when I add the multiple="multiple" attribute to the input type = file tag, I'm able to select multiple items in a single upload, it uploads the first selected item and the name of the last selected item. I'm not expecting the code to work cause it wasn't meant to handle multiple file uploads but there has to be a way around it, right?? Since, it's taking one file and the name of another one.

I have looked multiple stackoverflow threads and googled a lot. I wouldn't have posted this if I had found the answer. I'm not looking for uploading multiple files using the types of code below:

<input type ="file" name="file">
<input type ="file" name="file">
<input type ="file" name="file2">

I don't want to upload multiple files individually. I want to be able to select multiple files at a time and all of them to be uploaded somewhere. My tag is like this:

<input type ="file" name="file" multiple="multiple">

Here's the entire HTML code.

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action ="http://localhost:8080/fuseframework/uploadfile/upload" method="post" enctype="multipart/form-data">
file: 
<br>
<input type ="file" name="file" multiple="multiple">

<input type="submit" value="send">
</form>
</body>
</html>

These are the jars I've used http://i.stack.imgur.com/1tVT8.png

回答1:

It works OK for me to use the 'FormDataMultiPart'.

Here is the Java code, the FormDataContentDisposition object(formParams) contains actual file content.

List<FormDataBodyPart> parts = formParams.getFields("file");
for (FormDataBodyPart part : parts) {
    FormDataContentDisposition file = part.getFormDataContentDisposition();
}

In the JS side, I use the FormData object and push several files with the same name:

for (var i = 0; i < files.length; i++)
    fd.append('file', files[i]);

Wish it will help

回答2:

This thing worked for me pretty well:

@POST
@Consumes(MediaType.MULTIPART_FORM_DATA)
public void uploadMultiple(@FormDataParam("file") FormDataBodyPart body){
    for(BodyPart part : body.getParent().getBodyParts()){
        InputStream is = part.getEntityAs(InputStream.class);
        ContentDisposition meta = part.getContentDisposition();
        doUpload(is, meta);
    }
}

来源：https://stackoverflow.com/questions/25749472/selecting-multiple-files-and-uploading-them-using-jersey

标签

java

rest

jersey

multipartform-data

multiple-file-upload