Servlet文件上传

后台代码

package com.action;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import javax.jms.BytesMessage;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FileUtils;

public class UploadServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        //上传位置目标路径
        String basePath = "D://upload";
        //
        DiskFileItemFactory dfif = new DiskFileItemFactory();
        //
        ServletFileUpload sf = new ServletFileUpload(dfif);
        //
        sf.setHeaderEncoding("UTF-8");
        //判断表单是否为上传文件
        if(!ServletFileUpload.isMultipartContent(req)){
            return;
        }
        String message = "";
        try {
            List<FileItem> items = sf.parseRequest(req);
            //是否是普通input
            for (FileItem fileItem : items) {
                if(fileItem.isFormField()){
                    String name = fileItem.getFieldName();
                    String value = fileItem.getString("utf-8");
                    System.out.println(name+","+value);
                }
                else{
                    //System.out.println(fileItem.getFieldName()+","+fileItem.getName());
                    //如果上传文件为空
                    String fileName = fileItem.getName();
                    if (fileName == null||fileName.trim().equals("")){
                        //跳过file的input 接着遍历其他input
                        continue;
                    }
                    //文件上传
                    InputStream is = fileItem.getInputStream();
                    FileOutputStream fos = new FileOutputStream(basePath + "/"+fileName);
                    byte[] buffer = new byte[1024];
                    int len = 0;
                    while ((len=is.read(buffer)) != -1){
                        fos.write(buffer, 0, len);
                    }
                    is.close();
                    fos.close();
                    fileItem.delete();
                    message = "文件上传成功";
                }
            }
        } catch (FileUploadException e) {
            e.printStackTrace();
            message = "文件上传失败";
        }
        req.setAttribute("message", message);
        req.getRequestDispatcher("index.jsp").forward(req, resp);
    }
}

前台表单

<form action="upload" method="post" enctype="multipart/form-data">
        <input type="text" name="username">
        <input type="text" name="password">
        <input type="file" name="myFile">
        <input type="submit" value="submit">
    </form>