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JSP/Serlet 使用fileupload上传文件
需要引用的jar
commons-fileupload-1.3.1.jar
commons-io-2.2.jar
index.jsp
<body> <center> <h3>文件上传</h3> <font color="red"><%=request.getAttribute("msg")==null?"":request.getAttribute("msg") %> </font> <form enctype="multipart/form-data" method="post" action="servlet/FileUploadServlet"> 文件描述:<input type="text" name="text" /><br/> 选择文件:<input type="file" name="file1" /><br/> 选择文件:<input type="file" name="file2" /><br/> 选择文件:<input type="file" name="file3" /><br/> 选择文件:<input type="file" name="file4" /><br/> 选择文件:<input type="file" name="file5" /><br/> <input type="submit" value="http://www.mamicode.com/上传" /> </form> </center> </body>
FileUploadServlet.jsp
package com.accp.fileupload.servlet; import java.io.File; import java.io.IOException; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.FileUploadBase.FileSizeLimitExceededException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class FileUploadServlet extends HttpServlet { private static final long serialVersionUID = 2827297299439162553L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //使用同一种处理方法 doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setContentType("text/html; charset=UTF-8"); //保存路径 String savePath = getServletContext().getRealPath("/upload"); File saveDir = new File(savePath); // 如果目录不存在,就创建目录 if(!saveDir.exists()){ saveDir.mkdir(); } // 创建文件上传核心类 DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload sfu = new ServletFileUpload(factory); //设置编码 sfu.setHeaderEncoding("UTF-8"); // 设置上传的单个文件的最大字节数为2M sfu.setFileSizeMax(1024*1024*2); //设置整个表单的最大字节数为10M sfu.setSizeMax(1024*1024*10); try{ // 处理表单请求 List<FileItem> itemList = sfu.parseRequest(request); for (FileItem fileItem : itemList) { // 对应表单中的控件的name String fieldName = fileItem.getFieldName(); System.out.println("控件名称:" + fieldName); // 如果是普通表单控件 if(fileItem.isFormField()){ String value = http://www.mamicode.com/fileItem.getString(); "ISO-8859-1"),"UTF-8"); System.out.println("普通内容:" + fieldName + "=" + value); // 上传文件 }else{ // 获得文件大小 Long size = fileItem.getSize(); // 获得文件名 String fileName = fileItem.getName(); System.out.println("文件名:"+fileName+"\t大小:" + size + "byte"); //设置不允许上传的文件格式 if(fileName.endsWith(".exe")){ request.setAttribute("msg", "不允许上传的类型!"); }else{ //将文件保存到指定的路径 File file = new File(savePath,fileName); fileItem.write(file); request.setAttribute("msg", "上传成功!"); } } } }catch(FileSizeLimitExceededException e){ request.setAttribute("msg", "文件太大"); }catch(FileUploadException e){ e.printStackTrace(); }catch(Exception e){ e.printStackTrace(); } //上传完毕后 转发到首页 request.getRequestDispatcher("/index.jsp").forward(request, response); } }
注意要采用action 方式提交表单,不要使用 ajax的方式提交表单,否则会有异常信息。
org.apache.commons.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn‘t contain a multipart/form-data or multipart/mixed stream, content type header is null
at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:885)
JSP/Serlet 使用fileupload上传文件
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