servlet的提交

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servlet的提交和動態改變有點依賴xml

我們點擊控制項的時候改變了裡面的變數，改變了xml，servlet發現變數變了，就會重新整理頁面

如果xml文檔沒有更新，瀏覽器採用緩衝而不則行

<form action=‘"+requestURI+"‘method=‘get‘><input type=‘text‘ name=‘param‘ value=‘param string‘><input type=‘submit‘ value=‘用get方式查詢"+requestURI+"‘></form>

action後面接要發到文檔的url，（這個代碼是發到自己那裡，然後自己的文檔更新了，頁面也動態更新）

method是我們人為控制用什麼方法(get/post

後面有些變數,比如 param...我們後面可以用String param=request.getParameter("param");來獲得他

 

package servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class FirstServlet extends HttpServlet {    /**     * Constructor of the object.     */    public FirstServlet() {        super();    }    /**     * Destruction of the servlet. <br>     */    public void destroy() {        super.destroy(); // Just puts "destroy" string in log        // Put your code here    }    /**     * The doGet method of the servlet. <br>     *     * This method is called when a form has its tag value method equals to get.     *      * @param request the request send by the client to the server     * @param response the response send by the server to the client     * @throws ServletException if an error occurred     * @throws IOException if an error occurred     */    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.execute(request,response);    }    /**     * The doPost method of the servlet. <br>     *     * This method is called when a form has its tag value method equals to post.     *      * @param request the request send by the client to the server     * @param response the response send by the server to the client     * @throws ServletException if an error occurred     * @throws IOException if an error occurred     */    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.execute(request,response);    }    /**     * Initialization of the servlet. <br>     *     * @throws ServletException if an error occurs     */    public void execute(HttpServletRequest request,HttpServletResponse response)        throws ServletException,IOException    {        this.log("則行doget方法");        response.setCharacterEncoding("UTF-8");        request.setCharacterEncoding("UTF-8");        String requestURI=request.getRequestURI();        String method=request.getMethod();        String param=request.getParameter("param");        response.setContentType("text/html");        PrintWriter out = response.getWriter();        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");        out.println("<HTML>");        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");        out.println("  <BODY>");        out.println(method+"方式訪問該頁面。取到的para參數是"+param+"<br/>");        out.println("<form action=‘"+requestURI+"‘method=‘get‘><input type=‘text‘ name=‘param‘ value=‘param string‘><input type=‘submit‘ value=‘用get方式查詢"+requestURI+"‘></form>");        out.println("<form action=‘"+requestURI+"‘method=‘post‘><input type=‘text‘ name=‘param‘ value=‘param string‘><input type=‘submit‘ value=‘用post方式查詢"+requestURI+"‘></form>");        out.println("<script>document.write(‘本頁面最後更新時間‘+document.lastModified);</script>");        out.println("  </BODY>");        out.println("</HTML>");        out.flush();        out.close();    }    public void init() throws ServletException {        // Put your code here    }}

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servlet的提交