使用http request

上传文件上传到http server，同时也提交其他参数，java.net.net.urlconnection and Multipart/form-data Encoding是普遍的。 Here's a breakdown of the process:

Multipart/Form-Data Encoding

Multipart/form-data is designed for POST requests that combine both binary (e.g., files) and character data (e.g., parameters).编码涉及将请求主体划分为多个部分，每个部分都以边界字符串。

args）抛出异常{ 字符串url =“ http://example.com/upload”; 字符串param =“ value”; 文件textfile = new file（“/path/to/file.txt”）; 文件binaryfile =新文件（“/path/to/file.bin”）; 字符串边界= long.tohexstring（system.currentTimeMillis（））; urlConnection Connection = new URL（url）.openconnection（）; connection.setDoOutput（true）; connection.setRequestProperty（“ content-type”，“多部分/form-data; boundare =” boundare）; 尝试（outputStream输出= Connection.getOutputStream（）; printwriter writer = new printwriter（new UppoteStreamWriter（output，standardcharsets.utf_8），true））{ //发送参数 writer.append（“ - ”边界）.append（“ \ r \ n”）; writer.append（“ content-disposition：form-data; name = \“ param \”“）。append（“ \ r \ n”）; writer.append（“ content-type：text/plain; charset =“ standardcharsets.utf_8）.append（“ \ r \ n”）; writer.append（“ \ r \ n”）。append（param）.append（“ \ r \ n”）。flush（）; //发送文本文件 writer.append（“ - ”边界）.append（“ \ r \ n”）; writer.append（“ content-disposition：form-data; name = \“ textfile \”; filename = \“” textfile.getName（）“ \”“）。append（“ \ r \ n”）; writer.append（“ content-type：text/plain; charset =“ standardcharsets.utf_8）.append（“ \ r \ n”）; writer.append（“ \ r \ n”）。flush（）; files.copy（textfile.topath（），输出）; output.flush（）; writer.append（“ \ r \ n”）。flush（）; //发送二进制文件 writer.append（“ - ”边界）.append（“ \ r \ n”）; writer.append（“ content-disposition：form-data; name = \“ binaryfile \”; filename = \“” binaryfile.getName（）“ \”“）。append（“ \ r \ n”）; writer.append（“ content-type：” urlConnection.guessContentTypefromName（binaryfile.getName（）））。append（“ \ r \ n”）; writer.append（“ content-transfer-insoding：binary”）。append（“ \ r \ n”）; writer.append（“ \ r \ n”）。flush（）; files.copy（binaryfile.topath（），输出）; output.flush（）; writer.append（“ \ r \ n”）。flush（）; //多部分/form-data的结尾 writer.append（“ - ”边界“ - ”）。append（“ \ r \ n”）。flush（）; } int响应=（（httpurlConnection）连接）.getResponsecode（）; system.out.println（“响应代码：” wonsectecode）; } }

Additional Notes

Apache Commons FileUpload is only required on the server-side for handling uploaded files.

java.net.URLConnection is preferred for firing HTTP requests without external dependencies.

For more information,请参阅java.net.urlconnection和multipart/form-data（rfc2388）上的文档。