java 上传1（使用java组件fileupload）
使用fileupload要添加以下包
例子1
后台程序
| @RequestMapping(value="demo1") public String demo1(HttpServletRequest request,HttpServletResponse response){ return "/demo1"; } @RequestMapping(value="demo1U",method=RequestMethod.POST) public String demo1U(HttpServletRequest request,HttpServletResponse response) throws FileUploadException{ boolean isMultipart = ServletFileUpload.isMultipartContent(request);//检查输入请求是否为multipart表单数据。 if (isMultipart == true) { FileItemFactory factory = new DiskFileItemFactory();//为该请求创建一个DiskFileItemFactory对象，通过它来解析请求。执行解析后，所有的表单项目都保存在一个List中。 ServletFileUpload upload = new ServletFileUpload(factory); List<FileItem> items = upload.parseRequest(request); Iterator<FileItem> itr = items.iterator(); while (itr.hasNext()) { FileItem item = (FileItem) itr.next(); //检查当前项目是普通表单项目还是上传文件。 if (item.isFormField()) {//如果是普通表单项目，显示表单内容。 String fieldName = item.getFieldName(); if (fieldName.equals("name")) //对应demo1.html中type="text" name="name" System.out.print("the field name is" + item.getString());//显示表单内容。 } else {//如果是上传文件，显示文件名。 System.out.print("the upload file name is" + item.getName()); } } } else { System.out.print("the enctype must be multipart/form-data"); } return null; } |
前台jsp
| <%@ 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>demo1</title> </head> <body> //必须是multipart的表单数据。 <form name="myform" action="<%=basePath%>/upload/demo1U" method="post" enctype="multipart/form-data"> Your name: <br> <input type="text" name="name" size="15"><br> File:<br> <input type="file" name="myfile"><br> <br> <input type="submit" name="submit" value="Commit"> </form> <br> </body> </html> |
例子2
后台程序
| @RequestMapping(value="demo2") public String demo2(HttpServletRequest request,HttpServletResponse response){ return "/demo2"; } @RequestMapping(value="demo2U",method=RequestMethod.POST) public String demo2U(HttpServletRequest request,HttpServletResponse response) throws FileUploadException{ String uploadPath="D:\\temp"; boolean isMultipart = ServletFileUpload.isMultipartContent(request); if(isMultipart==true){ try{ FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); List<FileItem> items = upload.parseRequest(request);//得到所有的文件 Iterator<FileItem> itr = items.iterator(); while(itr.hasNext()){//依次处理每个文件 FileItem item=(FileItem)itr.next(); String fileName=item.getName();//获得文件名，包括路径 if(fileName!=null){ File fullFile=new File(item.getName()); File savedFile=new File(uploadPath,fullFile.getName()); item.write(savedFile); } } System.out.print("upload succeed"); } catch(Exception e){ e.printStackTrace(); } } else{ System.out.println("the enctype must be multipart/form-data"); } return null; } |
前台jsp
| <%@ 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>demo2</title> </head> <body> <form name="myform" action="<%=basePath%>/upload/demo2U" method="post" enctype="multipart/form-data"> File1:<br> <input type="file" name="myfile"><br> File2:<br> <input type="file" name="myfile"><br> <br> <input type="submit" name="submit" value="Commit"> </form> </body> </html> |
例子3
后台程序
| @RequestMapping(value="demo3") public String demo3(HttpServletRequest request,HttpServletResponse response){ return "/demo3"; } @RequestMapping(value="demo3U",method=RequestMethod.POST) public String demo3U(HttpServletRequest request,HttpServletResponse response) throws FileUploadException{ File uploadPath = new File("D:\\temp");//上传文件目录 if (!uploadPath.exists()) { uploadPath.mkdirs(); } // 临时文件目录 File tempPathFile = new File("d:\\temp\\buffer\\"); if (!tempPathFile.exists()) { tempPathFile.mkdirs(); } try { DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb factory.setRepository(tempPathFile);//设置缓冲区目 ServletFileUpload upload = new ServletFileUpload(factory); upload.setSizeMax(4194304); // 设置最大文件尺寸，这里是4MB List<FileItem> items = upload.parseRequest(request);//得到所有的文件 Iterator<FileItem> i = items.iterator(); while (i.hasNext()) { FileItem fi = (FileItem) i.next(); String fileName = fi.getName(); if (fileName != null) { File fullFile = new File(fi.getName()); File savedFile = new File(uploadPath, fullFile .getName()); fi.write(savedFile); } } System.out.print("upload succeed"); } catch (Exception e) { e.printStackTrace(); } return null; } |
前台jsp
| <%@ 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>demo3</title> </head> <body> //必须是multipart的表单数据。 <form name="myform" action="<%=basePath%>/upload/complete" method="post" enctype="multipart/form-data"> File:<br> <input type="file" name="myfile"><br> <br> <input type="submit" name="submit" value="Commit"> </form> </body> </html> |
例子4 通用的例子（待以后修改）
后台程序
| @RequestMapping(value="complete",method=RequestMethod.POST) public String complete(HttpServletRequest request,HttpServletResponse response) throws FileUploadException{ File uploadPath = new File("D:\\temp");//上传文件目录 if (!uploadPath.exists()) { uploadPath.mkdirs(); } // 临时文件目录 File tempPathFile = new File("d:\\temp\\buffer\\"); if (!tempPathFile.exists()) { tempPathFile.mkdirs(); } try { DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb factory.setRepository(tempPathFile);//设置缓冲区目 ServletFileUpload upload = new ServletFileUpload(factory); upload.setSizeMax(4194304); // 设置最大文件尺寸，这里是4MB List<FileItem> items = upload.parseRequest(request);//得到所有的文件 Iterator<FileItem> i = items.iterator(); while (i.hasNext()) { FileItem fi = (FileItem) i.next(); if(fi.isFormField()){//如果是普通的表单字段 }else{//如果是上传文件，显示文件名。 String fileName = fi.getName(); if (fileName != null) { //检查文件后缀格式 String fileEnd = fileName.substring(fileName.lastIndexOf(".")+1).toLowerCase(); List<String> extList=new ArrayList<String>(); extList.add("sql"); extList.add("txt"); if(extList.contains(fileEnd)){ File fullFile = new File(fi.getName()); File savedFile = new File(uploadPath, fullFile.getName()); fi.write(savedFile); }else{ System.out.print("ext error"); } } } } System.out.print("upload succeed"); } catch (Exception e) { e.printStackTrace(); } return null; } |
