用servlet+jsp实现的文件上传
首先我们写两个jsp页面，一个upload.jsp用于编写客户端提交的表单，一个是result.jsp用向用户输出结果，然后编写服务器端程序servelt，我们只需要重写doPost方法既可。upload.jsp
<body><form action="/MyStructs2/UploadServlet" type="post" method="post" enctype="multipart/form-data">username:<input type="text" name="username"><br>password: <input type="password" name="password"><br>file1 <input type="file" name=file1><br>file2 <input type="file"name=file2><br><input type="submit" value="submit"> </form> </body> result.jsp
<body> username:${requestScope.username}<br> password:${requestScope.password }<br> file1:${requestScope.file1}<br> file2:${requestScope.file2 }<br></body> UploadServlet.java
DiskFileItemFactory factory=new DiskFileItemFactory(); String path=request.getRealPath("/upload"); factory.setRepository(new File(path)); factory.setSizeThreshold(1024*1024); ServletFileUpload upload=new ServletFileUpload(factory); try {List<FileItem> list=upload.parseRequest(request);for(FileItem item:list){if(item.isFormField())//如果不是文件类型{String name=item.getFieldName();String value=item.getString();request.setAttribute(name, value);}else//如果是文件类型{String name=item.getFieldName();//得到字段名称String value=item.getName();//取得该字段的值int start=value.lastIndexOf("\\");String fileName=value.substring(start+1);//wenjianming request.setAttribute(name, fileName);OutputStream os=new FileOutputStream(new File(path,fileName));InputStream is=item.getInputStream();byte[] buffer=new byte;int length=0;while((length=is.read(buffer))>0){os.write(buffer,0,length);}os.close(); is.close();}}} catch (FileUploadException e) {// TODO Auto-generated catch blocke.printStackTrace();} request.getRequestDispatcher("upload/result.jsp").forward(request,response);//请求转发
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