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JSP编译为Java类

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);
    }
  }
}

 

posted @ 2015-10-12 08:35  stono  阅读(1708)  评论(0)  编辑  收藏  举报