上传文件fileupload+解决enctype= multipart/form-data无法传递其他参数

package controls; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; import java.util.Iterator; import java.util.List; import javax.servlet.ServletConfig; 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.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class ReadExcel extends HttpServlet{ private static final long serialVersionUID = 1L; private static final String UPLOAD_DIRECTORY="upload"; private static final int MEMORY_THRESHOLD = 1024*1024*3; private static final int MAX_FILE_SIZE = 1024*1024*40; private static final int MAX_REQUEST_SIZE = 1024*1024*50; private String city; private String year; protected void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException{ //request.setCharacterEncoding("uft-8"); response.setContentType("text/html；charset=utf-8"); //表单是否符合文件上传规则 //判断客户端请求是否为POST，并且enctype属性是否是“multipart/form-data" if(!ServletFileUpload.isMultipartContent(request)){ PrintWriter writer = response.getWriter(); writer.println("错误: 表单必须有 enctype=multipart/form-data."); writer.flush(); return; } //文件工厂类 判定初始文件内存以及文件超过内存时临时存放的位置 DiskFileItemFactory factory = new DiskFileItemFactory(); //以byte为单位设定文件使用多少内存量后，将文件存入临时存储 factory.setSizeThreshold(MEMORY_THRESHOLD); //设定临时文件的存储路径 factory.setRepository(new File(System.getProperty("java.io.tmpdir"))); //ServletFileUpload 处理同意HTML文件中多文件上传的类，继承自FileUpload ServletFileUpload upload = new ServletFileUpload(factory); //设置允许上传文件的最大大小 upload.setSizeMax(MAX_REQUEST_SIZE); String uploadPath = "E:"+File.separator +UPLOAD_DIRECTORY; //根据存储路径生成文件夹 File uploadDir = new File(uploadPath); if(!uploadDir.exists()){ uploadDir.mkdir(); } try{ List<FileItem> formItems = upload.parseRequest(request); if(formItems!=null && formItems.size()>0){ for(FileItem item:formItems){ if (item.isFormField()) { processFormField(item); //处理普通的表单域 System.out.println(city); System.out.println(year); } else { processUploadedFile(item,uploadPath); //处理上传文件 } } } } catch (Exception ex){ request.setAttribute("message", "有错误 " + ex.getMessage()); } getServletContext().getRequestDispatcher("/message.jsp").forward(request, response); } //处理普通表单域 private void processFormField(FileItem item) { try { //如果普通表单域名称是bookname，取对应的数据 if ("city".equals(item.getFieldName())) { city = item.getString("UTF-8").toString(); } if ("year".equals(item.getFieldName())) { year = item.getString("UTF-8").toString(); } //有几个普通表单文本框通过if方式判断取值 } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } //处理上传文件 private void processUploadedFile(FileItem item, String uploadPath ) throws Exception { String fileName = new File(item.getName()).getName(); String filePath = uploadPath + File.separator + fileName; System.out.println("filePath=" + filePath); File storeFile = new File(filePath); // 写入文件 item.write(storeFile); } }