用servlet將jsp檔案內容轉為html

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   用servlet將jsp檔案內容轉為html。代碼如下:

  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);

  /**

  * 只有成功初始化後此方法才能被調用處理使用者請求。前一個參數提供訪問初始請求資料的方法和欄位,

  * 後一個提供servlet構造響應的方法。

  */

  }

  // 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"; // 這是產生的html檔案名稱

  String pName = "e:Tomcat 5.5webappsjspTohtmlindex.htm"; // 產生html的完整路徑

  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輸出的內容寫到指定路徑的htm檔案中

  os.writeTo(fos);

  fos.close();

  response.sendRedirect(name); // 書寫完畢後轉向htm頁面

  }

  }

  在web.xml檔案中配置:

  < 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>

  下面是用來測試的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>簡單測試: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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