之前转载过一篇上传与下载的文章 ，，参考一下自己整理验证了一下
package com.jereh.edu.entity;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.Action;public class UpLoadAction { private String uname ; //前台提交的用户名 ； private File file; //上传文件 private String fileFileName; //上传文件 的文件名 前台自动提交不用另写 input private String fileContentType ;/上传文件 的文件类型 前台自动提交不用另写 input private InputStream inputStream ;//上传是用到的输入流 可以定义局部变量 private String fileName ;//前台隐藏上传的下载的文件名 private String downLoadPath; //下载路径 public String getFileName() {return fileName;}public void setFileName(String fileName) throws UnsupportedEncodingException{byte[] b= fileName.getBytes("utf-8");String str =new String(b,"iso-8859-1");//获取时重新解码编码 ，解决乱码 和不显示中文的问题this.fileName = str;}public String getDownLoadPath() {return downLoadPath;}public void setDownLoadPath(String downLoadPath) {this.downLoadPath = downLoadPath;}public InputStream getInputStream() {return inputStream;}public void setInputStream(InputStream inputStream) {this.inputStream = inputStream;}public String getUname() {return uname;}public void setUname(String uname) {this.uname = uname;}public File getFile() {return file;}public void setFile(File file) {this.file = file;}public String getFileFileName() {return fileFileName;}public void setFileFileName(String fileContentName) {this.fileFileName = fileContentName;} public String getFileContentType() {return fileContentType;}public void setFileContentType(String fileContentType) {this.fileContentType = fileContentType;}public String upFile() throws IOException{ //文件上传路径 ； String path = ServletActionContext.getServletContext().getRealPath("/upload/");// File upFile =new File(path+File.separatorChar+file.getName()); File upFile =new File(path+File.separatorChar+fileFileName); upFile.getParentFile().mkdir(); //创建path路径System.out.println("文件名+++++"+file.getName()+"—"+file.getPath()); //上传的file是个临时文件Struts2保存起来 我们把它导入到我们想要的路径下 System.out.println("上传的文件名+++++"+fileFileName+"—"+fileContentType);inputStream =new FileInputStream(file) ; //从临时文件里读取 OutputStream ops =new FileOutputStream(upFile); //输出到指定文件 byte[] b =new byte[1024] ; int length ; while((length=inputStream.read(b,0,b.length))!=-1){ops.write(b,0,length); }ops.close(); inputStream.close(); return Action.SUCCESS; }public InputStream getDownLoad() {return ServletActionContext.getServletContext().getResourceAsStream(downLoadPath);}public String downLoadFile(){return Action.SUCCESS ;}}有配置过Struts的一看就会明白<package name="upload" namespace="/upload" extends="struts-default" ><action name="upFile" method="upFile" class="com.jereh.edu.entity.UpLoadAction"><result name="success">/success.jsp</result></action><action name="downLoadFile" method="downLoadFile"class="com.jereh.edu.entity.UpLoadAction"><result name="success" type="stream"><param name="contentDisposition">attachment;filename=${fileName}</param><param name="inputName">downLoad</param></result></action></package> <param name="contentDisposition">attachment;filename=${fileName}</param>contentDisposition 配置了前台是弹出下载框的形式下载 否则 直接显示在页面上 filename 是下载框提示的下载文件的名字
前台jsp form 表单
<pre name="code" class="html"><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head><base href="<%=basePath%>"><title>upFile</title></head><body> <form action="upload/upFile.action" method ="post" enctype="multipart/form-data"><p>用户名：</p> <p><input type="text" name="uname"></p><p>文件：</p><p><input type="file" name="file"></p><p><input type="submit" value="提交"></p> </form> <br/> <h3>下载</h3> <form action="upload/downLoadFile.action" method="post"> <input type="hidden" name="downLoadPath" value="/upload/新建文本文档.txt"><input type="hidden" name="fileName" value="新建文本文档.txt"> <input type="submit" value="下载"></form> </body></html>
上传的表单的
<pre name="code" class="html">enctype="multipart/form-data"属性必须添加 而且method="post" 方式提交 为了数据的完整性
jsp中隐藏了文件路径和文件名 做的项目了可以改成js代码 就不多说了
人生难免有挫折，但你是逃避不了的，一定要去面对它
