本文使用的是smartupload工具实现文件的上传下载：
工具：
1、Eclipse
2、jspsmart.jar（百度搜索jspsmartupload.jar下载）
JSP页面：
1 <%--上传 --%>
2 <form action="upload" method="post" enctype="multipart/form-data">
3 <input type="file" name="file">
4 <input type="submit" value="上传">
5 </form>
6
7
8 <%--下载 --%>
9 <a href="down?file=A.jpg">下载</a>
10 <form action="down" method="post">
11 <input type="hidden" name="file" value="B.jpg">
12 <input type="submit" value="下载">
13 </form>
Servlet上传处理页面：
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置字符集（可以通过Filter设置）
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
//获取一个SmartUpload对象
SmartUpload upload=new SmartUpload();
//初始化
ServletConfig config=this.getServletConfig();
upload.initialize(config, request, response);
try {
//上传文件
upload.upload();
//获取上传的文件对象
File file=upload.getFiles().getFile(0);
//指定保存文件的路径
java.io.File newfile=new java.io.File(this.getServletContext().getRealPath("/")+"image");
if(!newfile.exists())
{
newfile.mkdirs();
}
//保存文件
file.saveAs(newfile+"/"+file.getFileName(), file.SAVEAS_PHYSICAL);
response.getWriter().println("上传成功");
System.out.println(newfile+"/"+file.getFileName());
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Servlet下载处理页面：
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//从JSP页面获取到用户需要下载的文件名
String file=request.getParameter("file");
//获取一个SmartUpload对象
SmartUpload download=new SmartUpload();
//初始化
ServletConfig config=this.getServletConfig();
download.initialize(config, request, response);
//禁止浏览器根据后缀名自动打开文件
download.setContentDisposition(null);
try {
//指定下载地址
download.downloadFile(this.getServletContext().getRealPath("/")+"image/"+file);
} catch (SmartUploadException e) {
e.printStackTrace();
}
}
参考文章：http://blog.ncmem.com/wordpress/2023/09/14/jsp%e9%a1%b5%e9%9d%a2%e5%ae%9e%e7%8e%b0%e4%b8%8a%e4%bc%a0%e4%b8%8b%e8%bd%bd/
欢迎入群一起讨论
标签：上传下载,request,upload,SmartUpload,JSP,file,newfile,response,页面 From： https://www.cnblogs.com/songsu/p/17702681.html