FileUpload框架实现文件上传(多个文件)和下载

来源：互联网发布：羽绒服时尚知乎编辑：程序博客网时间：2024/06/13 05:07

一、文件上传：

　　对于大文件执行下面的代码之间卡死

package com.example.web.service.servlet;import java.io.File;import java.io.IOException;import java.util.List;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.FileItemFactory;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class FileUpload extends HttpServlet {    private static final long serialVersionUID = 1L;    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        this.doPost(request, response);    }    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        try {            FileItemFactory factory = new DiskFileItemFactory();            ServletFileUpload upload = new ServletFileUpload(factory);            List<FileItem> items = upload.parseRequest(request);            String dir = request.getSession().getServletContext().getRealPath("/files");            File dirFile= new File(dir);            if(!dirFile.exists())                dirFile.mkdirs();            for (FileItem fileItem : items) {                //文本类型                if(fileItem.isFormField()){                    String name =fileItem.getFieldName();                    String value=fileItem.getString();                    System.out.println(" name: "+name+" value: "+value);                }else {                    System.out.println(" 上传文件目录: "+dir);                    File saveFile = new File(dir,fileItem.getName());                    fileItem.write(saveFile);                }            }                                        } catch (Exception e) {            e.printStackTrace();        }    }}

　　jsp界面，上传文件时form表单必须有 enctype="multipart/form-data"

<form action="<%=request.getContextPath() %>/FileUpload" method="post" enctype="multipart/form-data">        <input type="text" name="name" > <br>        <input type="file" name="file1"> <br>        <input type="file" name="file2"> <br>        <input type="submit" value=" submit "></form>

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