一个简单的使用commons-fileupload包上传文件的例子

package servelt; import java.io.*; import java.util.*; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; //import org.apache.commons.beanutils.BeanUtils; import org.apache.commons.fileupload.*; import org.apache.commons.fileupload.disk.*; import org.apache.commons.fileupload.servlet.*; import bean.*; public class Upload extends HttpServlet { /** * 文件上传 */ private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("GB2312"); response.setContentType("text/html;charset=GB2312"); PrintWriter out = response.getWriter(); Map m=new HashMap(0); try{ DiskFileItemFactory factory=new DiskFileItemFactory(); factory.setSizeThreshold(1024*4); ServletFileUpload upload=new ServletFileUpload(factory); upload.setFileSizeMax(1024*1024); upload.setHeaderEncoding("GB2312"); List items = upload.parseRequest(request);// 上传文件解析 for(FileItem item:(List<FileItem>)items){ if(item.isFormField()){ //表单字符串数据 // out.println("表单参数名:" + item.getFieldName() // + "，表单参数值:" + item.getString("GB2312")); m.put(item.getFieldName(),item.getString("GB2312")); }else{ if (item.getName() != null && !item.getName().equals("")) { // 判断是否选择了文件 out.println("上传文件的大小:" + item.getSize()); out.println("上传文件的类型:" + item.getContentType()); // item.getName()返回上传文件在客户端的完整路径名称 out.println("上传文件的名称:" + item.getName()); // 此时文件暂存在服务器的内存当中 // 获取根目录对应的真实物理路径 String uploadDir = getServletContext().getRealPath("/upload"); File tempFile = new File(item.getName());// 构造临时对象 File file = new File(uploadDir,tempFile.getName()); item.write(file);// 保存文件在服务器的物理磁盘中 out.println("文件上传成功"); } } } }catch(Exception e){ out.println(e); } /* UploadBean ub = new UploadBean(); // 使用Jakarta包提供的自动表单Bean的方法 try { BeanUtils.populate(ub, m); } catch (Exception e) { out.println("参数错误"); return; } out.println("书名："+ub.getBookName()); */ // request.setAttribute("message", ub.getBookName()); // request.getRequestDispatcher("/index.jsp").forward(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }