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>