用 servlet 将jsp文件内容转为html

  • 来源: 互联网 作者: 若水   2008-03-26/15:55
  • ServletJSP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>


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