JSP编译为Java类：

注意可以随便写import的内容；可以写类属性、方法、main函数、内部类；可以使用内部类；

JSP:

<%@ page language="java" import="java.util.*,a.b.*" pageEncoding="UTF-8"%>

<%

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";

%>

<!DOCTYPE html>

<html>

<%

    int cnt = 0;

%>

<head>

<meta charset="UTF-8">

<title>004index</title>

</head>

<body>

    cnt is :<%=++cnt%>

    <hr>

    <%-- <%= String s = "foo"%>是不行的； --%>

    <%=new String[3]%>

    <hr>

    <%=getCnt()%>

    <hr>

    <%=new Foo()%>

    <%!int cnt = 0;

    public static void main(String args) {

        System.out.println("a");

    }

    private int getCnt() {//如果返回void就无法使用表达式输出

        return ++cnt;

    }

    class Foo {

        private String a;

        public Foo() {

        }

        public Foo(String a) {

            this.a = a;

        }

        public String getA() {

            return a;

        }

        public String toString() {

            return "Foo:" + a;

        }

    }%>

</body>

</html>

Java:

/*

 * Generated by the Jasper component of Apache Tomcat

 * Version: Apache Tomcat/7.0.35

 * Generated at: 2015-10-12 00:25:50 UTC

 * Note: The last modified time of this file was set to

 *       the last modified time of the source file after

 *       generation to assist with modification tracking.

 */

package org.apache.jsp;

import javax.servlet.*;

import javax.servlet.http.*;

import javax.servlet.jsp.*;

import java.util.*;

import a.b.*;

public final class index004_jsp extends org.apache.jasper.runtime.HttpJspBase

    implements org.apache.jasper.runtime.JspSourceDependent {

int cnt = 0;

    public static void main(String args) {

        System.out.println("a");

    }

    private int getCnt() {

        return ++cnt;

    }

    class Foo{

        private String a;

        public Foo(){}

        public Foo(String a){

            this.a = a;

        }

        public String getA(){

            return a;

        }

        public String toString(){

            return "Foo:" + a;

        }

    }

  private static final javax.servlet.jsp.JspFactory _jspxFactory =

          javax.servlet.jsp.JspFactory.getDefaultFactory();

  private static java.util.Map<java.lang.String,java.lang.Long> _jspx_dependants;

  private javax.el.ExpressionFactory _el_expressionfactory;

  private org.apache.tomcat.InstanceManager _jsp_instancemanager;

  public java.util.Map<java.lang.String,java.lang.Long> getDependants() {

    return _jspx_dependants;

  }

  public void _jspInit() {

    _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();

    _jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());

  }

  public void _jspDestroy() {

  }

  public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)

        throws java.io.IOException, javax.servlet.ServletException {

    final javax.servlet.jsp.PageContext pageContext;

    javax.servlet.http.HttpSession session = null;

    final javax.servlet.ServletContext application;

    final javax.servlet.ServletConfig config;

    javax.servlet.jsp.JspWriter out = null; // 注意这个out是JspWriter<java.io.Writer<java.lang.Object;不是Object>Writer>java.io.PrintWriter

    final java.lang.Object page = this;

    javax.servlet.jsp.JspWriter _jspx_out = null;

    javax.servlet.jsp.PageContext _jspx_page_context = null;

    try {

      response.setContentType("text/html;charset=UTF-8");

      pageContext = _jspxFactory.getPageContext(this, request, response,

                  null, true, 8192, true);

      _jspx_page_context = pageContext;

      application = pageContext.getServletContext();

      config = pageContext.getServletConfig();

      session = pageContext.getSession();

      out = pageContext.getOut();

      _jspx_out = out;

      out.write('\r');

      out.write('\n');

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";

      out.write("\r\n");

      out.write("<!DOCTYPE html>\r\n");

      out.write("<html>\r\n");

    int cnt = 0;

      out.write("\r\n");

      out.write("<head>\r\n");

      out.write("<meta charset=\"UTF-8\">\r\n");

      out.write("<title>b index</title>\r\n");

      out.write("</head>\r\n");

      out.write("<body>\r\n");

      out.write("\tcnt is :");

      out.print(++cnt);

      out.write("\r\n");

      out.write("\t<hr>\r\n");

      out.write("\t");

      out.write('\r');

      out.write('\n');

      out.write('    ');

      out.print(new String[3]);

      out.write("\r\n");

      out.write("\t<hr>\r\n");

      out.write("\t");

      out.print(getCnt());

      out.write("\r\n");

      out.write("\t<hr>\r\n");

      out.write("\t");

      out.print(new Foo() );

      out.write('\r');

      out.write('\n');

      out.write('    ');

      out.write("\r\n");

      out.write("</body>\r\n");

      out.write("</html>\r\n");

    } catch (java.lang.Throwable t) {

      if (!(t instanceof javax.servlet.jsp.SkipPageException)){

        out = _jspx_out;

        if (out != null && out.getBufferSize() != 0)

          try { out.clearBuffer(); } catch (java.io.IOException e) {}

        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);

        else throw new ServletException(t);

      }

    } finally {

      _jspxFactory.releasePageContext(_jspx_page_context);

    }

  }

}

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