package examples;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import javax.Servlet.RequestDispatcher;
import javax.Servlet.ServletContext;
import javax.Servlet.ServletException;
import javax.Servlet.ServletOutputStream;
import javax.Servlet.http.HttpServlet;
import javax.Servlet.http.HttpServletRequest;
import javax.Servlet.http.HttpServletResponse;
import javax.Servlet.http.HttpServletResponseWrapper;
public class ToHtml extends HttpServlet { private static final String CONTENT_TYPE = "text/html; charset=GBK"; // Initialize global variables public void init() throws ServletException { } // Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType(CONTENT_TYPE); service(request, response); /** * 只有成功初始化后此方法才能被调用处理用户请求。前一个参数提供访问初始请求数据的方法和字段, * 后一个提供Servlet构造响应的方法。 */ } // Process the HTTP Post request public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } public void destroy() { } public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ServletContext sc = getServletContext(); String url = "/index.JSP"; String name = "index.htm"; // 这是生成的html文件名 String pName = "e:Tomcat 5.5webappsJSPTohtmlindex.htm";
// 生成html的完整路径 RequestDispatcher rd = sc.getRequestDispatcher(url); 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)); HttpServletResponse rep = new HttpServletResponseWrapper(response) { public ServletOutputStream getOutputStream() { return stream; } public PrintWriter getWriter() { return pw; } }; rd.include(request, rep); pw.flush(); FileOutputStream fos = new FileOutputStream(pName);
// 把JSP输出的内容写到指定路径的htm文件中 os.writeTo(fos); fos.close(); response.sendRedirect(name); // 书写完毕后转向htm页面 } } 在web.xml文件中配置: <Servlet>
<Servlet-name>Tohtml</Servlet-name>
<Servlet-class>examples.ToHtml</Servlet-class>
</Servlet>
<Servlet-mapping>
<Servlet-name>Tohtml</Servlet-name>
<url-pattern>/Tohtml</url-pattern>
</Servlet-mapping>
下面是用来测试的index.JSP: <%@ page contentType="text/html; charset=gb2312" %>
<html>
<head>
<title>Cache Filter Test</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
简单测试:s=
<%
int s=0;
// mock time-consuming code
for (int i=0;i<1000;i++) {
for (int j=0;j<1000;j++) {
s=s+j;
}
}
out.print(s);
%>
</body>
</html>
效果图: