1.文件上传的jsp页面
<body> <!--multipart/form-data:不对字符编码。在使用包含文件上传控件的表单时，必须使用该值。 --> <!-- 所谓不对字符编码：要是是上传文件，就是不对文件内容进行编码 --> <center> <form name="fileupload" action="FileAction" method="POST" enctype="multipart/form-data"> 文件上传：<input id="fileup1" name="fileup1" size="30" type="file" /> <p></p> 文件上传：<input id="fileup2" name="fileup2" size="30" type="file" /> <p></p> 文件上传：<input id="fileup3" name="fileup3" size="30" type="file" /> <p></p> <input type="submit" name="file_sub" id="file_sub" value="上传"/> </form> </center> </body>
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2.web.xml文件配置
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<servlet>
<description></description>
<display-name>FileAction</display-name>
<servlet-name>FileAction</servlet-name>
<servlet-class>testFileup.FileAction</servlet-class>
<init-param>
<param-name>uploadfilepath</param-name>
<param-value>upload</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>FileAction</servlet-name>
<url-pattern>/FileAction</url-pattern>
</servlet-mapping>
<servlet>
<description></description>
<display-name>FileDownLoad</display-name>
<servlet-name>FileDownLoad</servlet-name>
<servlet-class>testFileup.FileDownLoad</servlet-class>
<init-param>
<param-name>uploadfilepath</param-name>
<param-value>upload</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>FileDownLoad</servlet-name>
<url-pattern>/FileDownLoad</url-pattern>
</servlet-mapping>
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?3.文件上传部分（用的是org.apache.commons.fileupload）
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protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//得到servlet配置中文件上传的路径
String path=this.getInitParameter("uploadfilepath");
path=this.getServletContext().getRealPath("/")+path;//获得文件存放的物理路径
//path=request.getContextPath()+"\\"+path;
System.out.println("文件存放的物理路径："+path);
//System.out.println("文件内容："+(String)request.getParameter("fileup1"));
//是否上传成功
boolean state=false;
java.util.List<File> files=new java.util.ArrayList();
try{
//创建一个基于磁盘文件的工厂
DiskFileItemFactory factory=new DiskFileItemFactory();
//setRepository：Sets the directory used to temporarily store files that are larger than the configured size threshold.
factory.setRepository(new File(path));
//setSizeThreshold:Sets the size threshold beyond which files are written directly to disk.
factory.setSizeThreshold(10);
//创建一个文件处理器
ServletFileUpload upload=new ServletFileUpload(factory);
//解析请求
//Processes an RFC 1867 compliant multipart/form-data stream.
List items=upload.parseRequest(request);
//处理文件上传项
//Iterator iter=items.iterator();
//while(iter.hasNext()){
for(int i=0;i<items.size();i++){
//FileItem:This class represents a file or form item that was received within a multipart/form-data POST request.
//FileItem item=(FileItem)iter.next();
FileItem item=(FileItem)items.get(i);
if(item.isFormField()){
//true if the instance represents a simple form field;
//普通请求，可以接受请求中的其他参数
}else{
//文件上传请求
//获得文件上传名
String filename=item.getName();
//filename在IE浏览器获得是具体的文件上传的物理地址，如C:\Documents and Settings\lilang\桌面\5单元-javaWEB开发-13\14.实战报表：jFreeChart，cewolf，iText，jExcel.doc
//在firefox获得的是文件的名字，如：2.JSTL应用讲解.doc
System.out.println("文件全名："+filename);
if(!filename.equals("")){
int count=filename.lastIndexOf("\\");
if(count>0){
filename=filename.substring(count);
}else{
filename="\\"+filename;
}
File temf=new File(path+filename);
System.out.println("保存的路径为："+temf.getAbsolutePath());
//将文件写入服务器的目录上
item.write(temf);
files.add(temf);
state=true;
}
}
}
}catch(Exception ep){
ep.printStackTrace();
}
response.setContentType("text/html;charset=gbk");
PrintWriter out=response.getWriter();
if(state){
while(files.size()>0){
File file=files.remove(0);
String filePath=file.getParentFile().getName()+"/"+file.getName();
System.out.println("连接的文件路径："+filePath);
//out.println("<br><a href=\""+filePath+"\">"+file.getName()+"</a>");//不以io输出流来下载文件，直接在浏览器打开
String filename=file.getName();
System.out.println("FileAction--文件名："+filename);
out.println("<br><a href=\"FileDownLoad?filename="+filename+"\">"+file.getName()+"</a>");
}// end while
}
?4.文件下载部分
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protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("GB2312");
String filename=request.getParameter("filename");
filename=new String(filename.getBytes("ISO-8859-1"));
System.out.println("获得的文件名："+filename);
//filename=URLDecoder.decode(filename,"UTF-8");
//System.out.println("文件名："+filename);
String filePath=this.getServletContext().getRealPath("/")+this.getInitParameter("uploadfilepath")+"\\"+filename;
System.out.println("要下载的文件物理路径："+filePath);
response.reset();//可以加也可以不加
response.setContentType("application/x-download");
String filedownload =filePath;//提供下载的文件的物理路径
String filedisplay = filename;//文件下载路径
filedisplay =URLEncoder.encode(filedisplay,"UTF-8");
response.addHeader("Content-Disposition","attachment;filename=" + filedisplay);
ServletOutputStream outp = null;
FileInputStream in = null;
try
{
outp = response.getOutputStream();
in = new FileInputStream(filedownload);
byte[] b = new byte[in.available()];
int t = 0;
while((t= in.read(b)) > 0)
{
outp.write(b, 0, t);
}
outp.flush();
}
catch(Exception e)
{
System.out.println("Error!");
e.printStackTrace();
}
finally
{
if(in != null)
{
in.close();
in = null;
}
if(outp != null)
{
outp.close();
outp = null;
}
}
}