jsp+servlet小项目（实现图片上传功能）

package com.yibin.cn.servlet; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.UUID; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import javax.websocket.Session; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import utils.Page; import com.yibin.cn.dao.entity.User; import com.yibin.cn.service.IUserService; import com.yibin.cn.service.impl.UserServiceImpl; public class UserServlet extends BaseServlet { // 登录 public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("login方法被调用"); // 1、获取数据 String username = request.getParameter("username"); String password = request.getParameter("password"); // 2、封装数据 User user = new User(); user.setName(username); user.setPassword(password); // IUserDao iUserDao = new UserDaoImpl(); IUserService iUserService = new UserServiceImpl(); // 3、调用API User resUser = iUserService.getUserByNameAndPassword(user); // 4、控制跳转 if (resUser != null) { if (resUser.getName().equals(username) && resUser.getPassword().equals(password)) { List<User> users = new ArrayList<User>(); users = iUserService.listAll(); HttpSession session = request.getSession(); session.setAttribute("users", users); session = request.getSession(); session.setAttribute("username", username); PrintWriter out = response.getWriter(); // out.print("登录成功！"); request.getRequestDispatcher("showPage.jsp").forward(request, response); } } else { /* * PrintWriter out = response.getWriter(); out.print("登录失败！"); * out.print("<script type='text/javascript'>"); * out.print("alert('用户名或密码错误，请重新登录！');"); * out.print("window.location.href='login.jsp';"); * out.print("</script>"); //response.sendRedirect("login.jsp"); */ HttpSession session = request.getSession(); session.setAttribute("loginFlag", "fail"); response.sendRedirect("login.jsp"); } } // 增 public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("add方法被调用"); // 获取数据 int id = 0; String username = null; String password = null; String sex = null; Date birthday = null; String address = null; String saveFileName = null; String picturePath = null; // 得到表单是否以enctype="multipart/form-data"方式提交 boolean isMulti = ServletFileUpload.isMultipartContent(request); if (isMulti) { // 通过FileItemFactory得到文件上传的对象 FileItemFactory fif = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(fif); try { List<FileItem> items = upload.parseRequest(request); for (FileItem item : items) { // 判断是否是普通表单控件，或者是文件上传表单控件 boolean isForm = item.isFormField(); if (isForm) {// 是普通表单控件 String name = item.getFieldName(); if ("id".equals(name)) { id = Integer.parseInt(item.getString("utf-8")); System.out.println(id); } if ("sex".equals(name)) { sex = item.getString("utf-8"); System.out.println(sex); } if ("username".equals(name)) { username = item.getString("utf-8"); System.out.println(username); } if ("password".equals(name)) { password = item.getString("utf-8"); System.out.println(password); } if ("birthday".equals(name)) { String birthdayStr = item.getString("utf-8"); SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd"); try { birthday = sdf.parse(birthdayStr); } catch (ParseException e) { e.printStackTrace(); } System.out.println(birthday); } if ("address".equals(name)) { address = item.getString("utf-8"); System.out.println(address); } if ("picturePath".equals(name)) { picturePath = item.getString("utf-8"); System.out.println(picturePath); } } else {// 是文件上传表单控件 // 得到文件名 xxx.jpg String sourceFileName = item.getName(); // 得到文件名的扩展名：.jpg String extendedName = sourceFileName.substring( sourceFileName.lastIndexOf("."), sourceFileName.length()); // 把文件名称重命名为全球唯一的文件名 String uniqueName = UUID.randomUUID().toString(); saveFileName = uniqueName + extendedName; // 得到上传到服务器上的文件路径 // C:\\apache-tomcat-7.0.47\\webapps\\taobaoServlet4\\upload\\xx.jpg String uploadFilePath = request.getSession() .getServletContext().getRealPath("upload/"); File saveFile = new File(uploadFilePath, saveFileName); // 把保存的文件写出到服务器硬盘上 try { item.write(saveFile); } catch (Exception e) { e.printStackTrace(); } } } } catch (NumberFormatException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (FileUploadException e) { // TODO Auto-generated catch block e.printStackTrace(); } } // int id = Integer.parseInt(request.getParameter("id")); // String username = request.getParameter("username"); // String password = request.getParameter("password"); // String sex = request.getParameter("sex"); // String birthday = request.getParameter("birthday"); // String address = request.getParameter("address"); // String picturePath = request.getParameter("picturePath"); // HttpSession session = request.getSession(); // 2、封装数据 User user = new User(id, username, password, sex, birthday, address, saveFileName); // 3、调用逻辑层API IUserService iUserService = new UserServiceImpl(); // 4、控制跳转 HttpSession session = request.getSession(); if (iUserService.save(user) > 0) { System.out.println("添加新用户成功！"); List<User> users = new ArrayList<User>(); users = iUserService.listAll(); session.setAttribute("users", users); response.sendRedirect("UserServlet?action=getPage"); } else { System.out.println("添加新用户失败！"); PrintWriter out = response.getWriter(); out.print("<script type='text/javascript'>"); out.print("alert('添加新用户失败！请重试！');"); out.print("</script>"); } } // 删 public void delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("delete方法被调用"); HttpSession session = request.getSession(); int id = 0; if (session.getAttribute("id") != null) { id = (int) session.getAttribute("id"); } User user = new User(); user.setId(id); String uploadFilePath = request.getSession() .getServletContext().getRealPath("upload/"); IUserService iUserService = new UserServiceImpl(); //获取图片路径并删除 String picPath = uploadFilePath+"\\"+iUserService.getUserById(id).getPicturePath(); File oldPicTodelete = new File(picPath); oldPicTodelete.delete();// 删除图片 if (iUserService.delete(user) > 0) { System.out.println("删除成功！"); List<User> users = new ArrayList<User>(); users = iUserService.listAll(); session.setAttribute("users", users); response.sendRedirect("UserServlet?action=g