Jsp 3—— 声明语法

<%! %>

<%@page contentType="text/html; charset=UTF-8"%>

<%
    doSome();
%>

<%!
    int i = 100;
%>

<%-- 
    JSP的声明语法格式:
        <%!
            实例变量;
            静态变量;
            方法;
            静态语句块;
            构造函数;
            .....
        %>
        
        注:
            声明块中的java程序会被JSP翻译引擎翻译到service方法之外
            声明块中不能直接编写java语句,除非是变量的声明
--%>

<%!
    //java语句不能直接出现在类体中
    //System.out.println("Hello World!");

    public void doSome(){
        System.out.println("do some!");
    }
%>

<%
    System.out.println("servlet‘s service method execute!");
%>

<%!
    static{
        System.out.println("Class Loader!");
    }
%>

<%
    int j = 100;
%>

<%!
    public static void doOther(){
        System.out.println("do other!");
    }
%>

<%
    System.out.println("j = " + j);
    System.out.println("i = " + i);
%>
public class index_jsp extends HttpJspBase {
    int i = 100;

    public void doSome() {
        System.out.print("do some");
    }

    static {
        System.out.println("Class Loader!");
    }

    public static void doOther() {
        System.out.println("do other!");
    }

    public void _jspService(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("servlet‘s service method excute!");
        int j = 100;
        System.out.println("j = " + j);
        System.out.println("i = " + i);
    }
}

 

Jsp 3—— 声明语法

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