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我正在尝试使用 Multipart/form-data 将图像上传到服务器，我必须在同一个调用中发送一些文本和图像。当我只发送原始数据时，它工作正常，但是当我添加“图像上传部分”时它不起作用。下面是我的代码。

 public String upLoadPostMethod(List<NameValuePair> params, boolean isUploadingPhoto) {
            NameValuePair nvp = params.get(1);
            String args = nvp.getValue();
            System.out.println(args);
            String lineEnd = "\r\n";
            String twoHyphens = "--";
            String boundary = "********";
            HttpsURLConnection conn;
            String response = "";
            int bytesRead, bytesAvailable, bufferSize; 
            byte[] buffer; 
            int maxBufferSize = 1*1024*1024; 
            String mimeType = "image/jpeg";

            try {
                URL url = new URL(webServiceUrl);
                conn = (HttpsURLConnection) url.openConnection();

                conn.setDoInput(true);
                conn.setDoOutput(true);
                //conn.setChunkedStreamingMode(0);
                // Use a post method.
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Connection", "Keep-Alive");
                conn.setRequestProperty("Cookie",
                        appStatus.getSharedStringValue(appStatus.AUTH_KEY));
                System.out.println(appStatus
                        .getSharedStringValue(appStatus.AUTH_KEY));
                conn.setRequestProperty("Content-Type",
                        "multipart/form-data; boundary=" + boundary);

                DataOutputStream dos;
                dos = new DataOutputStream(conn.getOutputStream());

                // Send parameter #1
                dos.writeBytes(twoHyphens + boundary + lineEnd);
                dos.writeBytes("Content-Disposition: form-data; name=\"cmd\""
                        + lineEnd + lineEnd);
                dos.writeBytes("tsql" + lineEnd);
                // Send parameter #2
                dos.writeBytes(twoHyphens + boundary + lineEnd);
                dos.writeBytes("Content-Disposition: form-data; name=\"args\""
                        + lineEnd + lineEnd);
                dos.writeBytes(args + lineEnd);
                System.out.println("args======" + args);
                if(isUploadingPhoto){

                    dos.writeBytes(twoHyphens + boundary + lineEnd); 
                    dos.writeBytes("Content-Disposition: form-data; name=\"file\";"
+"filename=\" 20130125_155208.jpg\"" +"Content-Type: "+mimeType +lineEnd+lineEnd);

                        FileInputStream fileInputStream = new FileInputStream(Environment.getExternalStorageDirectory().getPath()
+"/20130125_155208.jpg");

                    bytesAvailable = fileInputStream.available();

                    bufferSize = Math.min(bytesAvailable, maxBufferSize); 
                    buffer = new byte[bufferSize]; 

                    // read file and write it into form... 

                    bytesRead = fileInputStream.read(buffer, 0, bufferSize); 

                    while (bytesRead > 0) 
                    { 
                        dos.write(buffer, 0, bufferSize); 
                        bytesAvailable = fileInputStream.available(); 
                        bufferSize = Math.min(bytesAvailable, maxBufferSize); 
                        bytesRead = fileInputStream.read(buffer, 0, bufferSize); 
                    } 

                    dos.writeBytes(lineEnd); 
                    dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); 

                    fileInputStream.close(); 
                }else {
                    dos.writeBytes(lineEnd); 
                    dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); 
                }

                dos.flush();
                dos.close();

                Scanner inStream = new Scanner(conn.getInputStream());
                while (inStream.hasNextLine())
                    response += (inStream.nextLine());

                System.out.println(response);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return response;
        }

我在这里做错了什么吗？

4

1 回答 1

0

我想您需要在表单页面中放入encType="multipart/form-data"标签<form>：请参见下面的示例代码，希望对您有所帮助：

当我使用 Struts 1.3.8 并且我在 jsp 中有一个用户注册页面时，用户必须上传图像以及一些文本信息，如姓名、地址等......

<html:form action="/register?s=r" method="Post" enctype="multipart/form-data" onsubmit="return validateFob(this)">

  <table width="65%" border="0" height="65%" bgcolor="beige">




.....
............
   </table>

于 2013-04-04T09:52:45.803 回答