jsp+servlet的增删改查页面

今天终于是把java网页开发的基本东西都学完了，了解了java的基本操作。感觉java的环境还是很好的，有许多jar包可以使用，这样子就可以快速开发一个模块功能出来了。

这次我是自己写了一个从后台提取数据然后进行增删改查的操作。还有分页等功能。如下图：

这些数据都是直接从数据库直接提取出来的。这里的话，使用了三层架构的模式，将功能不同的层划分出来，这里用dao,service,servlet这三个，然后dao是负责与数据库打交道的，service是与服务器层打交道的，然后servlet的话是用来将界面与服务器端连接起来的。分完工后就可以开始做了。

划分的结构图如下：

这里面只讲解一下servlet的知识，毕竟其它的我在上次的几个文章有提及过这里就不详细说明了。

BaseServlet：

package com.d.cn.servlet;import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class BaseServlet extends HttpServlet {@Overridepublic void service(ServletRequest request, ServletResponse response)throws ServletException, IOException {//服务器乱码request.setCharacterEncoding("utf-8");//客户端乱码response.setCharacterEncoding("utf-8");//响应到客户端头部乱码response.setContentType("text/html;charset=utf-8");String action = request.getParameter("action");if(action==null || "".equals(action.trim())){System.out.println("feifa");return;}Method method;try {method = this.getClass().getMethod(action, HttpServletRequest.class,HttpServletResponse.class);method.invoke(this, request,response);} catch (NoSuchMethodException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InvocationTargetException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}

这里采用的是反射机制，所以这里的函数调用可以直接在继承类里面写，然后这个父类自动帮你加载这些函数执行，这样子就可以在url获取到ac函数，就直接进去ac函数执行了，简化了操作。

UserServlet：

package com.d.cn.servlet;import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLDecoder;
import java.util.List;
import java.util.UUID;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;import com.d.cn.dao.entity.User;
import com.d.cn.dao.impl.UserDaoImpl;
import com.d.cn.service.impl.UserServiceImpl;
import com.d.cn.utils.Page;public class UserServlet extends BaseServlet{UserServiceImpl userServiceImpl = new UserServiceImpl();public void login(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{//1.收集数据String username = (String) request.getParameter("username");String password = (String) request.getParameter("password");//2.封装数据User user = new User();user.setName(username);user.setPassword(password);//3.调用API层User resultUser = userServiceImpl.getUserMsg(user);List<User> lUsers = userServiceImpl.listAll();//4.控制跳转HttpSession session = request.getSession();PrintWriter out = response.getWriter();if(resultUser!=null){session.setAttribute("username", username);session.setAttribute("ListAll", lUsers);request.getRequestDispatcher("welcome.jsp").forward(request, response);}else{out.println("<script type='text/javascript'>");out.println("alert('密码或账号错误！');");out.println("window.location.href='login.jsp';");out.println("</script>");}}public void add(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{String id = null;String username = null;String sex = null;String password = null;String address = null;String picturePath = null;User user = new User();//请求信息中的内容是否是multipart类型boolean isMultipart = ServletFileUpload.isMultipartContent(request);//上传文件的存储路径（服务器文件系统上的绝对文件路径）String uploadFilePath = request.getSession().getServletContext().getRealPath("upload/" );System.out.println(uploadFilePath);if (isMultipart) {FileItemFactory factory = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(factory);try {//解析form表单中所有文件List<FileItem> items = upload.parseRequest(request);for (FileItem fileItem : items) {if(fileItem.isFormField()){//普通表单字段String fieldName = fileItem.getFieldName();   //表单字段的name属性值if("name".equals(fieldName)){username = fileItem.getString("UTF-8");}if("sex".equals(fieldName)){sex = fileItem.getString("UTF-8");}if("password".equals(fieldName)){password = fileItem.getString("UTF-8");}if("address".equals(fieldName)){address = fileItem.getString("UTF-8");}if("id".equals(fieldName)){id = fileItem.getString("UTF-8");}}else{//文件表单字段String fileName = fileItem.getName();String extendName = fileName.substring(fileName.lastIndexOf('.'), fileName.length());String onlyOneName = UUID.randomUUID().toString();picturePath = onlyOneName+extendName;System.out.println(uploadFilePath+"\\"+picturePath);File saveFile = new File("D:\\JavaWork\\newPoj\\upload\\"+picturePath);fileItem.write(saveFile);}}} catch (Exception e) {e.printStackTrace();}}user.setId(Integer.parseInt(id));user.setName(username);user.setSex(sex);user.setPassword(password);user.setAddress(address);user.setPicturePath(picturePath);int row = -1;row = userServiceImpl.insert(user);if(row>0){response.sendRedirect("UserServlet?action=page");}}public void upd(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{String id = request.getParameter("id");User user = new User();if(id!=null){user.setId(Integer.parseInt(id));}user.setName(request.getParameter("username"));user.setSex(request.getParameter("sex"));user.setPassword(request.getParameter("password"));user.setAddress(request.getParameter("address"));user.setPicturePath(request.getParameter("picturePath"));int row = -1;row = userServiceImpl.update(user);if(row>0){response.sendRedirect("UserServlet?action=page");}}public void del(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{String id = request.getParameter("id");User user = new User();if(id!=null){user.setId(Integer.parseInt(id));}user.setName(request.getParameter("username"));user.setSex(request.getParameter("sex"));user.setPassword(request.getParameter("password"));user.setAddress(request.getParameter("address"));user.setPicturePath(request.getParameter("picturePath"));int row = -1;row = userServiceImpl.delete(user);if(row>0){response.sendRedirect("UserServlet?action=page");}}public List<User> listAll(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{return userServiceImpl.listAll();}public void page(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
UserDaoImpl userDaoImpl = new UserDaoImpl();String currentPageStr = request.getParameter("currentPage");if(currentPageStr==null){currentPageStr = "1";}int currentPage = Integer.parseInt(currentPageStr);int pageSize = 3;Page<User> page = userDaoImpl.getPage(currentPage,pageSize);HttpSession session = request.getSession();session.setAttribute("page", page);response.sendRedirect("welcome.jsp");}
}

在这里我写了一个文件上传的功能，这里的路径采用的是静态的，但是文件的名是采用唯一名字的方法生成的，这样子在上传的时候就不会出现重复的错误了。

整个工程：传送门

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