JavaWeb(实现文件上传)（一）

严重: Servlet.service() for servlet [com.xyf.web6.UploadServlet] in context with path [/webtest] threw exception
java.lang.IllegalStateException: Unable to process parts as no multi-part configuration has been provided

package com.xyf.web6;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
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
public class UploadServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
Part part = request.getPart("uploadFile");
String inputName=part.getName();
InputStream input=part.getInputStream();
//想要保存的目标文件的目录下
String tagDir=getServletContext().getRealPath("/upload");
//避免文件名重复使用uuid来避免,产生一个随机的uuid字符
String realFileName=UUID.randomUUID().toString();
OutputStream output=new FileOutputStream(new File(tagDir,realFileName));
int len=0;
byte[] buff=new byte[1024*8];

while ((len = input.read(buff)) > -1) {
output.write(buff, 0, len);
}
input.close();
output.close();
response.setCharacterEncoding("utf-8");
response.getWriter().print("upload success!!");

}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}

<%@ page language="java" cOntentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

enctype="multipart/form-data"

String uploadFullPath=tagDir;
//先创建这个文件
File file=new File(uploadFullPath);
File ParentFile=file.getParentFile();
if(!ParentFile.exists())
{
ParentFile.mkdirs();//如果文件夹不存在，就创建文件夹

}