JSP上传图片前端和后台程序
<%@ page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%>
<%@ page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%>
<%@ page import="org.apache.commons.fileupload.*"%>
<% response.setContentType("text/html");
//?? 图片上传路径
?? String uploadPath =request.getSession().getServletContext().getRealPath("/")+"upload/images/";
//?? 图片临时上传路径
?? String tempPath = request.getSession().getServletContext().getRealPath("/")+"upload/images/temp/";
//?? 图片网络相对路径
?? String imagePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";?
//?? 文件夹不存在就自动创建：
?? if(!new File(uploadPath).isDirectory())
?? new File(uploadPath).mkdirs();
?? if(!new File(tempPath).isDirectory())
?? new File(tempPath).mkdirs();
?? try {
?? DiskFileUpload fu = new DiskFileUpload();
//?? 设置最大文件尺寸，这里是4MB
?? fu.setSizeMax(4194304);
//?? 设置缓冲区大小，这里是4kb
?? fu.setSizeThreshold(4096);
//?? 设置临时目录：
?? fu.setRepositoryPath(tempPath);
//?? 得到所有的文件：
?? List fileItems = fu.parseRequest(request);
?? Iterator i = fileItems.iterator();
//?? 依次处理每一个文件：
?? while(i.hasNext()) {
?? FileItem file = (FileItem)i.next();
//?? 获得文件名，这个文件名是用户上传时用户的绝对路径：
?? String sourcefileName = file.getName();
?? if(sourcefileName!=null&&(sourcefileName.endsWith(".jpg")||sourcefileName.endsWith(".gif"))) {
//?? 在这里可以记录用户和文件信息,生成上传后的文件名
?? String destinationfileName=null;
?? Random rd = new Random();
?? Calendar time = Calendar.getInstance();
?? if(sourcefileName.endsWith(".jpg")){
?? destinationfileName=String.valueOf(time.get(Calendar.YEAR))
?? + String.valueOf(time.get(Calendar.MONTH))
?? + String.valueOf(time.get(Calendar.DAY_OF_MONTH))
?? + String.valueOf(time.get(Calendar.HOUR_OF_DAY))
?? + String.valueOf(time.get(Calendar.MINUTE))
?? + String.valueOf(time.get(Calendar.SECOND))
?? + String.valueOf(rd.nextInt(100)) + ".jpg";
?? }else if(sourcefileName.endsWith(".gif")){
?? destinationfileName=String.valueOf(time.get(Calendar.YEAR))
?? + String.valueOf(time.get(Calendar.MONTH))
?? + String.valueOf(time.get(Calendar.DAY_OF_MONTH))
?? + String.valueOf(time.get(Calendar.HOUR_OF_DAY))
?? + String.valueOf(time.get(Calendar.MINUTE))
?? + String.valueOf(time.get(Calendar.SECOND))
?? + String.valueOf(rd.nextInt(100)) + ".gif";
?? }
?? File f1=new File(uploadPath+ destinationfileName);
?? file.write(f1);
?? out.print(sourcefileName+"成功上传！") ;
?? out.print("<img src="+imagePath+"upload/images/"+destinationfileName+">");
?? }else{
?? out.println("上传文件出错，只能上传 *.jpg , *.gif");
?? }
?? }
//?? 跳转到上传成功提示页面
?? }
?? catch(Exception e) {
//?? 可以跳转出错页面
?? }
?? out.flush();
?? out.close();
%>
