jsp和servlet的区别 用servlet将jsp文件内容转为html

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 5.5webappsjspTohtmlindex.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>