開發(fā)WEB應(yīng)用程序要使用到的知識(shí)點(diǎn).doc

開發(fā)WEB應(yīng)用程序要使用到的知識(shí)點(diǎn):1.建數(shù)據(jù)庫、建表、造數(shù)2.根椐表建立，BEAN類，DAO，UTIL類（JDBC:a.數(shù)據(jù)庫的連接Connection，b:預(yù)處理對象PreparedStatement,c.結(jié)果集的處理對象ResultSet,d.在JDBC中增刪改查e.JDBC中處理事務(wù)f.JDBC中處理存儲(chǔ)過程3. MVC開發(fā)模式：V：jsp頁面,主要顯示數(shù)據(jù)給用戶，不做任何業(yè)務(wù)邏輯的處理 C: Servlet，主要處理業(yè)務(wù)邏輯，并且控制頁面的跳轉(zhuǎn) M: 主要處理數(shù)據(jù)的相關(guān)操作，步驟2中產(chǎn)生都屬于Modle4. Model I 模式 : JSP+JAVABean的開發(fā)模式 這里面有個(gè)知識(shí)點(diǎn)：JSP標(biāo)準(zhǔn)動(dòng)作： Jsp:include與include指令的區(qū)別 Model II模式 ：JSP+SERVLET+JAVABEAN5. 在login.jsp頁面我們必須要掌握的知識(shí)點(diǎn)有兩個(gè) 1. page指令及其常用屬性 contentType=text/html;charset=gb2312 指定頁面的格式和編碼 errorPage=error.jsp 頁面產(chǎn)生異常時(shí)要轉(zhuǎn)發(fā)到的界面 isThreadSafe=true 單線程頁面里用的屬性 2. include指令 ：靜態(tài)導(dǎo)入其它頁面，比如版權(quán)頁面 file=copyright.jsp 用戶名: 密碼: CheckServlet:package servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/* * 該頁面要掌握的知識(shí)點(diǎn): * 1. Servlet編寫方式：實(shí)現(xiàn)servlet接口，繼承GenericServlet,繼承HttpServlet * 2. Servlet生命周期： * 當(dāng)用戶第一次訪問Servlet時(shí)，Servlet會(huì)實(shí)例化，然后初始化，然后調(diào)用 * service方法判斷用戶是get,還是Post請求,然后轉(zhuǎn)給對應(yīng)的doGet,doPost方法處理 * 處理完成后響應(yīng)客戶端，然后實(shí)例會(huì)一直存在服務(wù)器上，當(dāng)其它用戶開 * 訪問的時(shí)候，就直接調(diào)用Service方法處理用戶請求，當(dāng)WEB應(yīng)用程序關(guān)閉時(shí) * servlet調(diào)用自身的destory()方法，釋放資源，最后被容器銷毀 * 簡單講 ： 實(shí)例化 初始化 調(diào)用Service 調(diào)用doXXX 響應(yīng) 銷毀 * 3. 在servlet中配置web.xml文件 CheckServlet servlet.CheckServlet CheckServlet /check * 4. 在servlet中設(shè)置參數(shù)：比如設(shè)置一個(gè)全局參數(shù) encoding gb2312 在Servlet中可以通過以下代碼得到上述值 String encoding = this.getServletContext().getInitParameter(encoding); 這樣做可以大大小減小代碼的維護(hù)量 * 5. HttpServletRequest中的方法request.setCharacterEncoding(gb2312); String username= request.getParameter(username);String fav = request.getParameterValues(fav); * 6. HttpServletResponse中的方法response.setContentType(text/html;charset=gb2312);response.sendRedirect(list);response.setHeader(refresh, 0;url=login.jsp); * 7. session中的常用方法 session.setAttribute(users, u);/往session中存值，一般登陸成功后，將用戶信息存入到session中 session.setMaxInactiveInterval(1800);session.getAttribute(“users”);session.invalidate(); /清空session中的內(nèi)容session.removeAttribute(“users”);/清除 users屬性 */public class CheckServlet extends HttpServlet /* * The doGet method of the servlet. * * This method is called when a form has its tag value method equals to get. * * param request the request send by the client to the server * param response the response send by the server to the client * throws ServletException if an error occurred * throws IOException if an error occurred */public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException response.setContentType(text/html);PrintWriter out = response.getWriter();out.println();out.println();out.println( A Servlet);out.println( );out.print( This is );out.print(this.getClass();out.println(, using the GET method);out.println( );out.println();out.flush();out.close();/* * The doPost method of the servlet. * * This method is called when a form has its tag value method equals to post. * * param request the request send by the client to the server * param response the response send by the server to the client * throws ServletException if an error occurred * throws IOException if an error occurred */public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException response.setContentType(text/html);PrintWriter out = response.getWriter();out.println();out.println();out.println( A Servlet);out.println( );out.print( This is );out.print(this.getClass();out.println(, using the POST meth