1.servlet hello实例---HelloServlet

时间：2022-11-09 20:10:39
1.用url调用servlet
　　建 web project “HelloServlet”，在src下建包com.amaker.servlet，在包下建HelloServlet.java。
package com.amaker.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;

//敲doGet alt+/,就会出现原来的方法

 public  class HelloServlet extends HttpServlet {

 /**

  *

  */

 private static final long serialVersionUID = 2733147315082601065L;

 protected void doGet(HttpServletRequest request, HttpServletResponse response)

   throws ServletException, IOException {

  // TODO Auto-generated method stub

  String url=request.getRequestURI().toString();

  System.out.println(url);

  PrintWriter out =response.getWriter();

  out.println("hello");

 }

}

修改web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>

<servlet-name>helloa</servlet-name>

<servlet-class>com.amaker.servlet.HelloServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>helloa</servlet-name>

<url-pattern>/servlet/hello</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<login-config>

<auth-method>BASIC</auth-method>

</login-config>

</web-app>
2.用表单调用：
在WebRoot文件夹中，添加一个HTML文件，Tset.html
<!DOCTYPE html>

<html>

  <head>

    <title>Tset.html</title>

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="this is my page">

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">

    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>

  <body>

 <form action="/HelloServlet/servlet/hello">

  <input type="submit" value="Test">

 </form>

  </body>

</html>
3.用超级链接调用Servler
 <hr>
 <a href="/HelloServlet/servlet/hello">link...</a>
4.用javascript调用servlet
<!DOCTYPE html>

<html>

  <head>

    <title>Tset.html</title>

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="this is my page">

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">

    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

 <script type="text/javascript">

  function test()

  {

   var f=document.forms[0];

   f.action="/HelloServlet/servlet/hello";

   f.submit();

  }

 </script>

  </head>

  <body>

 <form action="/HelloServlet/servlet/hello">

  <input type="submit" value="Test">

  <input type="button" value="click me" onclick="test()">

 </form>

 <hr>

 <a href="/HelloServlet/servlet/hello">link...</a>

  </body>

</html>]

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