jsp高并发，生成静态页面

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jsp高并发，生成静态页面5

每个高并发静态页面都有如下代码，求j2ee的各位来讲解一下

{
             final ByteArrayOutputStream os = new ByteArrayOutputStream();
             final ServletOutputStream stream = new ServletOutputStream() {   
  
                  public   void   write(byte[] data,int offset, int length)   {
                         os.write(data,   offset,   length);
                  }    
  
                  public   void   write(int   b)   throws   IOException   {
                         os.write(b);
                  }
              };  
  
               final PrintWriter pw = new PrintWriter(new OutputStreamWriter(os, encoding)); 
  
               HttpServletResponse rep =  new HttpServletResponseWrapper(response)   { 
  
                   public ServletOutputStream getOutputStream() {
                                  return stream;
                   }    
  
                   public PrintWriter getWriter() {
                                 return pw;
           }
               }; 
  
              logger.debug("HtmlCreatorServlet RequestDispatcher = " + templatePath);
              RequestDispatcher  dispatcher = getServletContext().getRequestDispatcher(templatePath);
              dispatcher.include(request, rep);
              pw.flush();
              FileOutputStream fos = null;
              try { 
  
                  if(os.size() == 0) {
                  response.sendError(HttpServletResponse.SC_NOT_FOUND, "");
                  }
          else {
                  fos = new FileOutputStream(cachhtmlFileName);
                  os.writeTo(fos);
                  dispatcher = getServletContext(). getRequestDispatcher("/"+htmlName);
                        dispatcher.include(request, response);
                  } 
  
                  } finally {
                  if(fos != null) {
                      fos.close();
                  }
             } 
  
}

其中主要不明白的是有：

1.那几个输出流，都在做什么；

2.是如何将动态代码写成静态页面的；

3.如此定义（实现接口）变量

    final ServletOutputStream stream = new ServletOutputStream() {   
  
                  public   void   write(byte[] data,int offset, int length)   {
                         os.write(data,   offset,   length);
                  }    
  
                  public   void   write(int   b)   throws   IOException   {
                         os.write(b);
                  }
              };

其中的方法没有看到应用那，所以目的是什么，怎么用的，效果是什么

请各位帮忙