javaWeb中文件上传

新建一个jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href="${pageContext.request.contextPath }/">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="upload" method="post" enctype="multipart/form-data">
		姓名<input type="text" name="name"><br>
		附件<input type="file" name="attachment" title="文件最大1MB"><br>
		
		<input type="submit" value="上传">
	</form>
</body>
</html>

新建一个servlet

package web.servlet;

import java.io.File;
import java.io.IOException;

import javax.servlet.Servlet;
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;

@WebServlet("/upload")
@MultipartConfig(maxFileSize=1024*1024,location="D:\\upload")
public class UploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
    public UploadServlet() {
    }
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.getRequestDispatcher("/upload.jsp").forward(request, response);
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String name=request.getParameter("name");
		Part attachment=request.getPart("attachment");
		attachment.write(attachment.getSubmittedFileName());
	}
	@Override
	public void init() throws ServletException {
		String location=UploadServlet.class.getAnnotation(MultipartConfig.class).location();
		File folder=new File(location);
		if (!folder.exists()) {
			folder.mkdirs();
		}
	}
	
}

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