Please enable JavaScript.

Coggle requires JavaScript to display documents.

JSP (jsp (Expression: <%= 3*2 %> : (Scriptlets: <% for(int i=0;…

- - - - Import: <%@ page import="com.ab;com.xy" %>
    - - Expression Language, no <%%>
        
        xx = ${1+2};${param.email};
      - Define functions and variables
        
        <%! int add2Numbers()...%>
        
        <%! int x=50; %>
        <%= "x is:"+x%>
    - - Exception page:error.jsp:
        <%@ page isErrorPage="true" %>
        The exception is: <%= exception %>
  - - - PrintWriter out = response.getWriter()
        out.println(...)
        
        String email = request.getParameter('email');
        
        Cookies
        
        request.getCookies();
        for ...loop
        eachCookie.getName();
        
        new Cookie("name", "Hoang");
        response.addCookie(...);
        
        <a href="file.asp">
        
        Use Bean in "Servlet"
        
        Send Bean from Servlet1 => Servlet 2
        
        in Sevlet1:
        request.setAttribute("personBean", personBean);
        
        In Servlet2:
        PersonBean personBean = (PersonBean)request.getAttribute("personBean");
        
        Navigate from Servlet1 to Servlet2:
        <a href="<%${pageContext.request.contextPath}%>/Servlet2">
        
        Redirect:
        resp.sendRedirect("Servlet2");
        
        PersonBean personBean = new PersonBean();
        personBean.setEmail("hoang@gmail.com");
      - Connect MySQL in doPost
        
        Class.forName("com.mysql.jdbc.Driver")
        connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/dbName")
        
        catch(SQLException | ClassNotFoundException e)
        
        CRUD
        (Cread, Read, Update, Delete)
        
        Query
        
        ps = connection.prepareStatement("SELECT * FROM...");
        rs = ps.executeQuery();
        while(rs.next()) {
        String name = rs.getString(2);
        String email = rs.getString(3);
        }
        
        Insert, Update, Delete
        
        ps = connection.prepareStatement("INSERT INTO...VALUES(?,?,?)");
        ps.setString(1, "hoang");
        ps.setString(2, "hoang@gmail.com");
        status=ps.executeUpdate();
      - <form action="servletName">.., not contains .java
        
        Link:
        http:../projectName/ServletName
    - - Servlet releases 1997
        JSP: 1999
  - - - Use Bean in .jsp file:
        First line:<jsp:useBean id='person' class='example.PersonBean'/>
        <%
        out.print("person's name is: "+person.getName());
        %>
        
        getProperty
        
        <jsp:useBean id='person'....>
        Name = <jsp:getProperty property="name" name="person" /></jsp:useBean>
        
        setProperty
        
        <jsp:useBean id='person'....>
        </jsp:useBean>
        ...
        person.setName('Hoang');
    - - Stateless SessionBean
        
        Result of each request is independent !
        A Java class, must import:
        import javax.ejb.*;
        
        @Stateless
        public class CalculationBean {
        //getter, setter, sum, minus,...
        }
        
        Servlet is an "action", "controller"
        
        public class AddServlet ...{
        @EJB
        CalculationBean calculationBean;
        ...doPost..{
        request.getParameter("number1");
        calculationBean.setNumber1(number1);
        }
        }
        
        In View(.jsp file):
        <form action="addServlet" method="POST">
      - Stateful SessionBean
        
        Each request is dependent !
        A Java class, must import:import javax.ejb.*;
        
        @Stateful
        public class ListBooks implements ListBooksRemote
        
        In View(.jsp):
        <%!private static ListBooksRemote listBooksRemote; %>
        
        public void jspInit() { //Remember try...catch InitialContext initialContext = new InitialContext(); listBooksRemote = initialContext.lookup("java:global/bai01/ListBooks"); }
        
        Show output in jsp:
        if(listBooksRemote !=null) { out.println("<h3>Show something</h3>") } %>
  - - - function
        
        function: <%@ taglib prefix="fn" uri="..."%>
      - sql: <%@ taglib prefix="sql" uri="..."%>
        
        <sql:setDataSource url="..." var=".."/>
        
        <sql:query ...>select * from ...</sql:query>
      - Core: <%@ taglib prefix="c" uri="..."%>
        
        Fetch Website: <c:import url="http..."/>
        
        Show string: <c:out value="aa"/>
        
        <c:forEach items="${persons} var="p">....</c:forEach>