Servlet程序演示doGet()和doPost()方法

View Code

package com.wyf.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.Servlet;
import javax.servlet.ServletException;

public class FirstServlet extends HttpServlet implements Servlet {
public FirstServlet() {
super();
    }

    @Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
this.log("执行doGet()方法... "); // 调用Servlet自带的日志输出信息到控制台
        this.execute(req, resp);
    }

    @Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
this.log("执行doPost()方法... "); // 调用Servlet自带的日志输出信息到控制台
        this.execute(req, resp);
    }

public void execute(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
        resp.setCharacterEncoding("UTF-8"); // 设置resp的编码格式
        req.setCharacterEncoding("UTF-8"); // 设置resp的编码格式
        String reqURL = req.getRequestURI();// 设置访问该Servlet的URL
        String method = req.getMethod(); // 设置访问Servlet的方法,GET活POST
        String param = req.getParameter("param");// 设置客户端提交的参数param的值

        resp.setContentType("text/html"); // 设置文档类型为HTML
        PrintWriter out = resp.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("以" + method + "方式访问该页面,取到的param参数为:" + param + "<br/>");
        out
                .println("<form action='"
                        + reqURL
                        + "' method='get'><input type='text' name='param' value='param String'><input type='submit' value='以get方式查询界面"
                        + reqURL + "'></form>");
        out
                .println("<form action='"
                        + reqURL
                        + "' method='post'><input type='text' name='param' value='param String'><input type='submit' value='以post方式查询界面"
                        + reqURL + "'></form>");

// 有客户端浏览器读取该文档的更新时间
        out
                .println("<script>document.write('本页面最后的更新时间:'+ document.lastModified);</script>");
        out.println("</body>");
        out.println("</html>");
        out.flush();
        out.close();
    }
}

运行结果:

(1) FirstServlet: 执行doPost()方法...

(2)FirstServlet: 执行doGet()方法...

这里显示了doGet()和doPost()方法的区别,区别总结如下,

转载于:https://my.oschina.net/garyun/blog/602919

Servlet程序演示doGet()和doPost()方法

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