# h1 Java web 練習code
Uploads.java

package cc.openhome;

import java.io.*;
import java.time.Instant;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

@MultipartConfig(location="c:/workspace")
@WebServlet("/uploads")

public class Uploads extends HttpServlet {

@Override
protected void doPost(
HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException{

request.setCharacterEncoding("UTF-8");
request.getParts()
.stream()
.filter(part->part.getName().startsWith("file"))//判斷檔案名稱開頭
.forEach(this::write); //迭代Stream中的每個元素
}

private void write(Part part) {
String submittedFileName = part.getSubmittedFileName();
String ext = submittedFileName.substring(//取得副檔名
submittedFileName.lastIndexOf('.'));

try {
part.write(String.format("%s%s", //使用時間毫秒數為主檔名
Instant.now().toEpochMilli(),ext));
} catch(IOException e) {
throw new UncheckedIOException(e);
}

}
}