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JSP显示内容缓存技巧

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  附件源代码

  不过采用resin服务器的话,以上代码会失效。因为resin没有实现getWriter方法,而是采用getOutputStream取而代之,所以必须修改些代码来迎合resin运行环境:

/** * START File FileCaptureResponseWrapper.java */

package com.junjing.filter;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class FileCaptureResponseWrapper
 extends HttpServletResponseWrapper
{
 private CharArrayWriter output;
 public String toString()
 {
  return output.toString();
 }
 public FileCaptureResponseWrapper(HttpServletResponse response)
 {
  super(response);
  output = new CharArrayWriter();
 }

 public PrintWriter getWriter()
 {
  return new PrintWriter(output);
 }

 public void writeFile(String fileName)
  throws IOException
 {
  FileWriter fw = new FileWriter(fileName);
  fw.write( output.toString());
  fw.close();
 }

 public ServletOutputStream getOutputStream()
  throws java.io.IOException
  {
   return new ServletOutputStream();
  }

 public void write(int b)
  throws IOException
 {
  output.write(b);
 }

 public void write(byte b[])
  throws IOException
 {
  output.write(new String(b,"GBK"));
 }

 public void write(byte b[], int off, int len)
  throws IOException
 {
  output.write(new String(b, off, len));
 }
};
}

 public void writeResponse(PrintWriter out)
 {
  out.print(output.toCharArray());
 }
}
/** * END File FileCaptureResponseWrapper.java */

 
 

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