对于servlet，javaBean内部的static数据，是否需要考虑同步访问呢？

jjc822 2007-11-14 10:18:41

请问各位在职的J2EE web开发的，对于servlet，javaBean内部的static数据，是否需要考虑同步访问呢？

我曾经在群上讨论过，但是在servlet的生命周期上遇到了问题，所以至今还未能明确！

希望能够得到企业版的回复！一般教材是没有考虑也没有提及这个问题！

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Graywolf8888 2007-11-20

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package org.apache.jsp;



import javax.servlet.*;

import javax.servlet.http.*;

import javax.servlet.jsp.*;

import java.util.*;



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

    implements org.apache.jasper.runtime.JspSourceDependent {



  private static final JspFactory _jspxFactory = JspFactory.getDefaultFactory();



  private static java.util.List _jspx_dependants;



  private javax.el.ExpressionFactory _el_expressionfactory;

  private org.apache.AnnotationProcessor _jsp_annotationprocessor;



  public Object getDependants() {

    return _jspx_dependants;

  }



  public void _jspInit() {

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

    _jsp_annotationprocessor = (org.apache.AnnotationProcessor) getServletConfig().getServletContext().getAttribute(org.apache.AnnotationProcessor.class.getName());

  }



  public void _jspDestroy() {

  }



  public void _jspService(HttpServletRequest request, HttpServletResponse response)

        throws java.io.IOException, ServletException {



    PageContext pageContext = null;

    HttpSession session = null;

    ServletContext application = null;

    ServletConfig config = null;

    JspWriter out = null;

    Object page = this;

    JspWriter _jspx_out = null;

    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("\r\n");

      out.write("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">\r\n");

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

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

      out.write("<META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=gb2312\">\r\n");

      out.write("<link rel=\"Shortcut Icon\" href=\"favicon.ico\"> \r\n");

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

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

      out.write("<h1>HI,I AM HERE!</h1>\r\n");

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

      out.write("<!--BODY ID=TestActivexInHTMLDlg BGCOLOR=LIGHTGREY ActName=''>\r\n");

      out.write("<TABLE WIDTH=100% HEIGHT=100%>\r\n");

      out.write("<TR WIDTH=100% HEIGHT=80%>\r\n");

      out.write("<TD ALIGN=CENTER VALIGN=BOTTOM>\r\n");

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

      out.write("<!--以下参数功能，请参考相关文档-->\r\n");

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

      out.write("<!--Object id=\"BoBo\" width=600 height=460 classid='clsid:EC0978ED-24E3-403C-AB7A-060E388553E6' codebase='http://www.17bobo.com/Software/BoBo_ActiveX_V3.ocx'>\r\n");

      out.write("<PARAM NAME=\"MaxLinkCount\"      VALUE=100>\r\n");

      out.write("<PARAM NAME=\"MaxCacheTimeS\"     VALUE=120>\r\n");

      out.write("<PARAM NAME=\"MinCacheTimeS\"     VALUE=60>\r\n");

      out.write("<PARAM NAME=\"MaxCacheSizeMB\"    VALUE=150>\r\n");

      out.write("<PARAM NAME=\"MaxDownloadKbps\"   VALUE=0>\r\n");

      out.write("<PARAM NAME=\"MaxUploadKbps\"     VALUE=0>\r\n");

      out.write("<PARAM NAME=\"RealMediaType\"     VALUE=\".mp4,.mp3\">\r\n");

      out.write("<PARAM NAME=\"TextAd\"            VALUE=\"BoBo\">\r\n");

      out.write("<PARAM NAME=\"PlayFlvFile\"       VALUE=\"http://www.boloso.com/bobo/boboflv.swf\">\r\n");

      out.write("<PARAM NAME=\"BCServerURL\"       VALUE=\"http://www.17bobo.com\">\r\n");

      out.write("<PARAM NAME=\"ActName\"           VALUE=\"rm/2.rm?Sd2b350c1_9ba87_24051e__f47_57\">\r\n");

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

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

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

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

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

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

      out.write("</HTML>");

    } catch (Throwable t) {

      if (!(t instanceof 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);

      }

    } finally {

      _jspxFactory.releasePageContext(_jspx_page_context);

    }

  }

}

有兴趣可以研究下，学东西就要学精，其它就触类旁通，我正在努力
LZ加油

Graywolf8888 2007-11-20

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LZ,JavaBean是相当于用在Servlet方法里的变量。。。。
看来你还没有完全搞清楚什么是JSP，Servlet。
JSP在TOMCAT之类的服务器里被转化成为Servlet，所有写在JSP里的东西，多数被转化Servlet方法里的东西
你不信去看看TOMCAT里工作的目录，里边是对于每个JSP都有一个SERVLET。。。
把我的目录，给你参考下。。。
C:\Program Files\Apache Software Foundation\Tomcat 6.0\work\Catalina\localhost\springapp\org\apache\jsp\WEB_002dINF\jsp\product_jsp.java

内容如下：

package org.apache.jsp.WEB_002dINF.jsp;



import javax.servlet.*;

import javax.servlet.http.*;

import javax.servlet.jsp.*;



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

    implements org.apache.jasper.runtime.JspSourceDependent {



}

内容太长，帖不下来。。。。。

jjc822 2007-11-16