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用response输出一个验证码

2024-08-29 08:08:41   218人阅读

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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("则行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+"方式访问该页面。取到的para参数是"+param+"<br/>");
        out.println("<form action=‘"+requestURI+"‘method=‘post‘><input type=‘text‘ name=‘qqq‘ value=http://www.mamicode.com/‘param string‘>);
        out.println("<script>document.write(‘本页面最后更新时间‘+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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用response输出一个验证码


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