<filter> <filter-name>FileCaptureFilter</filter-name> <filter-class>com.junjing.filter.FileCaptureFilter</filter-class> </filter> <filter-mapping> <filter-name>FileCaptureFilter</filter-name> <url-pattern>/latest.jsp</url-pattern> </filter-mapping> |
latest.jsp是我要cache的页面
java源码代码如下
/** * START File FileCaptureFilter.java */ package com.junjing.filter; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class FileCaptureFilter implements Filter { private String protDirPath; public void init(FilterConfig filterConfig) throws ServletException { protDirPath = filterConfig.getServletContext().getRealPath("/"); } public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain) throws IOException, ServletException { String fileName = protDirPath + "forum/lastest.html"; PrintWriter out = response.getWriter(); FileCaptureResponseWrapper responseWrapper = new FileCaptureResponseWrapper((HttpServletResponse)response); chain.doFilter(request, responseWrapper); // fill responseWrapper up String html = responseWrapper.toString(); //得到的html页面结果字符串 // responseWrapper.writeFile(fileName); // dump the contents 写成html文件,也可以保存在内存 //responseWrapper.writeResponse( out ); // back to browser //responseWrapper.sendRedirect("lastestThread.jsp"); } public void destroy() {} } /** * END File FileCaptureFilter.java */ /** * 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.toCharArray() ); fw.close(); } public void writeResponse(PrintWriter out) { out.print( output.toCharArray() ); } } /** * END File FileCaptureResponseWrapper.java */ |
/** * 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 */ |
<filter> <filter-name>FileCaptureFilter</filter-name> <filter-class>com.junjing.filter.FileCaptureFilter</filter-class> </filter> <filter-mapping> <filter-name>FileCaptureFilter</filter-name> <url-pattern>/latest.jsp</url-pattern> </filter-mapping> |
latest.jsp是我要cache的页面
java源码代码如下
/** * START File FileCaptureFilter.java */ package com.junjing.filter; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class FileCaptureFilter implements Filter { private String protDirPath; public void init(FilterConfig filterConfig) throws ServletException { protDirPath = filterConfig.getServletContext().getRealPath("/"); } public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain) throws IOException, ServletException { String fileName = protDirPath + "forum/lastest.html"; PrintWriter out = response.getWriter(); FileCaptureResponseWrapper responseWrapper = new FileCaptureResponseWrapper((HttpServletResponse)response); chain.doFilter(request, responseWrapper); // fill responseWrapper up String html = responseWrapper.toString(); //得到的html页面结果字符串 // responseWrapper.writeFile(fileName); // dump the contents 写成html文件,也可以保存在内存 //responseWrapper.writeResponse( out ); // back to browser //responseWrapper.sendRedirect("lastestThread.jsp"); } public void destroy() {} } /** * END File FileCaptureFilter.java */ /** * 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.toCharArray() ); fw.close(); } public void writeResponse(PrintWriter out) { out.print( output.toCharArray() ); } } /** * END File FileCaptureResponseWrapper.java */ |
/** * 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 */ |