用 servlet 将jsp文件内容转为html_JSP教程

推荐：JSP、Servlet中的相对路径和绝对路径
JSP和Servlet中的绝对路径和相对路径问题困扰了我好几天，经过努力之后将其部分心得和大家共享。 前提：假设你的Http地址为http://192.168.0.1/你的web应用为webapp，那么你的web应用

用servlet将jsp文件内容转为html。代码如下：

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 5.5\\webapps\\jspTohtml\\index.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>

分享：用 jspinclude 控制动态内容
在新的 JSP 最佳实践系列的前一篇文章中，您了解了如何使用 JSP include 伪指令将诸如页眉、页脚和导航组件之类的静态内容包含到 Web 页面中。和服务器端包含一样，JSP include 伪指令允