Servlet3.0上传文件

package com.itheima.upload;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

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;

import com.itheima.utils.UUIDUtils;
import com.itheima.utils.UploadUtils;
/**
 * 文件上传的Servlet
 * 表单项:分为两类 一类是文件表单项  一类是非文件表单项(普通表单项,不必设置enctype="mutipart/form-data")
 */
@MultipartConfig
@WebServlet("/UploadServlet")
public class UploadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //接受普通数据 非文件表单项 即普通表单项 不必设置enctype="multipart/form-data"
        request.setCharacterEncoding("UTF-8");
        String filedesc = request.getParameter("filedesc");
        System.out.println("文件描述:"+filedesc);
        //接受文件 文件表单项 必须满足三要素 post form enctype="multipart/form-data"
        //通过表单file控件(<input type="file" name="upload">)的名字属性直接获取Part对象
        Part part = request.getPart("upload");
        //获得文件大小
        long size = part.getSize();
        System.out.println("文件的大小为:"+size);
        String name = part.getName();
        System.out.println("文件上传表单的name属性的值为:"+name);
        //获取头信息
        String header = part.getHeader("Content-Disposition");
        System.out.println(header);
        //获取文件名字 \"为转义 
        int lastIndexOf = header.lastIndexOf("filename=\"");
        String filename = header.substring(lastIndexOf+10, header.length()-1);
        System.out.println("文件名称:"+filename);
        //获得文件内容
        InputStream ips = part.getInputStream();
        //获取要上传到的文件夹路径
        String realPath = this.getServletContext().getRealPath("/upload");
        System.out.println(realPath);
        //获得唯一文件名
        String uniname = UUIDUtils.getUUIDFileName(filename);
        //获得新的上传路径
        String fenglipath = realPath + UploadUtils.getPath(uniname);
        System.out.println(fenglipath);
        //创建上传路径的file对象
        File file = new File(fenglipath);
        //如果上传路径不存在,就创建
        if(!file.exists()){
            file.mkdirs();
        }
        //创建字节输出流,参数为"路径+文件名"
        OutputStream ops = new FileOutputStream(fenglipath+"/"+uniname);
        //io流读写
        byte [] bytes = new byte [1024];
        int len;
        while((len=ips.read(bytes))!=-1){
            ops.write(bytes, 0, len);
        }
        //关流
        ips.close();
        ops.close();
        
        
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}