Servlet Examples

Servlet Examples

1.Hello World

output：



code：

1.import java.io.*;
2.import javax.servlet.*;
3.import javax.servlet.http.*;
4.
5.public class HelloWorld extends HttpServlet {
6.
7.    public void doGet(HttpServletRequest request, HttpServletResponse response)
8.    throws IOException, ServletException
9.    {
10.        response.setContentType("text/html");
11.        PrintWriter out = response.getWriter();
12.        out.println("<html>");
13.        out.println("<head>");
14.        out.println("<title>Hello World!</title>");
15.        out.println("</head>");
16.        out.println("<body>");
17.        out.println("<h1>Hello World!</h1>");
18.        out.println("</body>");
19.        out.println("</html>");
20.    }
21.}

2.Request Info

output：



code：

1.import java.io.*;
2.import javax.servlet.*;
3.import javax.servlet.http.*;
4.
5.public class RequestInfo extends HttpServlet {
6.
7.    public void doGet(HttpServletRequest request, HttpServletResponse response)
8.    throws IOException, ServletException
9.    {
10.        response.setContentType("text/html");
11.        PrintWriter out = response.getWriter();
12.        out.println("<html>");
13.        out.println("<body>");
14.        out.println("<head>");
15.        out.println("<title>Request Information Example</title>");
16.        out.println("</head>");
17.        out.println("<body>");
18.        out.println("<h3>Request Information Example</h3>");
19.        out.println("Method: " + request.getMethod());
20.        out.println("Request URI: " + request.getRequestURI());
21.        out.println("Protocol: " + request.getProtocol());
22.        out.println("PathInfo: " + request.getPathInfo());
23.        out.println("Remote Address: " + request.getRemoteAddr());
24.        out.println("</body>");
25.        out.println("</html>");
26.    }
27.
28.    /**
29.     * We are going to perform the same operations for POST requests
30.     * as for GET methods, so this method just sends the request to
31.     * the doGet method.
32.     */
33.
34.    public void doPost(HttpServletRequest request, HttpServletResponse response)
35.    throws IOException, ServletException
36.    {
37.        doGet(request, response);
38.    }
39.}

3.Request Headers

output：



code：

1.import java.io.*;
2.import java.util.*;
3.import javax.servlet.*;
4.import javax.servlet.http.*;
5.
6.public class RequestHeaderExample extends HttpServlet {
7.
8.    public void doGet(HttpServletRequest request, HttpServletResponse response)
9.    throws IOException, ServletException
10.    {
11.        response.setContentType("text/html");
12.        PrintWriter out = response.getWriter();
13.        Enumeration e = request.getHeaderNames();
14.        while (e.hasMoreElements()) {
15.            String name = (String)e.nextElement();
16.            String value = request.getHeader(name);
17.            out.println(name + " = " + value);
18.        }
19.    }
20.}

4. Request Parameters

output：



code：

1.import java.io.*;
2.import java.util.*;
3.import javax.servlet.*;
4.import javax.servlet.http.*;
5.
6.public class RequestParamExample extends HttpServlet {
7.
8.    public void doGet(HttpServletRequest request, HttpServletResponse response)
9.    throws IOException, ServletException
10.    {
11.        response.setContentType("text/html");
12.        PrintWriter out = response.getWriter();
13.        out.println("<html>");
14.        out.println("<head>");
15.        out.println("<title>Request Parameters Example</title>");
16.        out.println("</head>");
17.        out.println("<body>");
18.        out.println("<h3>Request Parameters Example</h3>");
19.        out.println("Parameters in this request:<br>");
20.        if (firstName != null || lastName != null) {
21.            out.println("First Name:");
22.            out.println(" = " + HTMLFilter.filter(firstName) + "<br>");
23.            out.println("Last Name:");
24.            out.println(" = " + HTMLFilter.filter(lastName));
25.        } else {
26.            out.println("No Parameters, Please enter some");
27.        }
28.        out.println("<P>");
29.        out.print("<form action=\"");
30.        out.print("RequestParamExample\" ");
31.        out.println("method=POST>");
32.        out.println("First Name:");
33.        out.println("<input type=text size=20 name=firstname>");
34.        out.println("<br>");
35.        out.println("Last Name:");
36.        out.println("<input type=text size=20 name=lastname>");
37.        out.println("<br>");
38.        out.println("<input type=submit>");
39.        out.println("</form>");
40.        out.println("</body>");
41.        out.println("</html>");
42.    }
43.
44.    public void doPost(HttpServletRequest request, HttpServletResponse res)
45.    throws IOException, ServletException
46.    {
47.        doGet(request, response);
48.    }
49.}

5. Cookies

output：



code：

1.import java.io.*;
2.import javax.servlet.*;
3.import javax.servlet.http.*;
4.
5.public class CookieExample extends HttpServlet {
6.
7.    public void doGet(HttpServletRequest request, HttpServletResponse response)
8.    throws IOException, ServletException
9.    {
10.        response.setContentType("text/html");
11.        PrintWriter out = response.getWriter();
12.
13.        // print out cookies
14.
15.        Cookie[] cookies = request.getCookies();
16.        for (int i = 0; i < cookies.length; i++) {
17.            Cookie c = cookies[i];
18.            String name = c.getName();
19.            String value = c.getValue();
20.            out.println(name + " = " + value);
21.        }
22.
23.        // set a cookie
24.
25.        String name = request.getParameter("cookieName");
26.        if (name != null && name.length() > 0) {
27.            String value = request.getParameter("cookieValue");
28.            Cookie c = new Cookie(name, value);
29.            response.addCookie(c);
30.        }
31.    }
32.}

6. Sessions

output：



code：

1.import java.io.*;
2.import java.util.*;
3.import javax.servlet.*;
4.import javax.servlet.http.*;
5.
6.public class SessionExample extends HttpServlet {
7.
8.    public void doGet(HttpServletRequest request, HttpServletResponse response)
9.    throws IOException, ServletException
10.    {
11.        response.setContentType("text/html");
12.        PrintWriter out = response.getWriter();
13.
14.        HttpSession session = request.getSession(true);
15.
16.        // print session info
17.
18.        Date created = new Date(session.getCreationTime());
19.        Date accessed = new Date(session.getLastAccessedTime());
20.        out.println("ID " + session.getId());
21.        out.println("Created: " + created);
22.        out.println("Last Accessed: " + accessed);
23.
24.        // set session info if needed
25.
26.        String dataName = request.getParameter("dataName");
27.        if (dataName != null && dataName.length() > 0) {
28.            String dataValue = request.getParameter("dataValue");
29.            session.setAttribute(dataName, dataValue);
30.        }
31.
32.        // print session contents
33.
34.        Enumeration e = session.getAttributeNames();
35.        while (e.hasMoreElements()) {
36.            String name = (String)e.nextElement();
37.            String value = session.getAttribute(name).toString();
38.            out.println(name + " = " + value);
39.        }
40.    }
41.}

Servlet Examples的更多相关文章

  1. 漫谈servlet技术

    1.要谈到Servlet技术,不得不先谈谈动态网页的概念. 编写过网页的人都知道,浏览器能够根据HTML静态标记语言来显示各式各样的网页.但是如果我们需要在网页上完成一些业务逻辑:比如登陆验证.或者说 ...

  2. 115 Java Interview Questions and Answers – The ULTIMATE List--reference

    In this tutorial we will discuss about different types of questions that can be used in a Java inter ...

  3. 如何配置Tomcat以使用Apache httpd?

    How to Connect Tomcat 6 to Apache HTTP Server 2 Tomcat can be run as a standalone server. Tomcat can ...

  4. Java Code Examples for javax.servlet.http.Part

    http://www.programcreek.com/java-api-examples/index.php?api=javax.servlet.http.Part The following ar ...

  5. Tomcat7配置及其servlet调用详解

    Tomcat 1 Tomcat简介 Tomcat是一个免费的开源的Serlvet容器,它是Apache基金会的Jakarta项目中的一个核心项目,由Apache,Sun和其它一些公司及个人共同开发而成 ...

  6. Java面试题总结系列 Servlet

    Servlet技术主要是为了使用Web上的HTTP协议而设计的.servlet是在WEB服务器上运行的程序.Java Servlet可以用于处理客户请求或生成动态Web网页.先一个实例.然后解释. 先 ...

  7. Servlet 工作原理解析

    转自:http://www.ibm.com/developerworks/cn/java/j-lo-servlet/ Web 技术成为当今主流的互联网 Web 应用技术之一,而 Servlet 是 J ...

  8. JavaWeb总结--Servlet 工作原理解析

    从 Servlet 容器说起 要介绍 Servlet 必须要先把 Servlet 容器说清楚,Servlet 与 Servlet 容器的关系有点像枪和子弹的关系,枪是为子弹而生,而子弹又让枪有了杀伤力 ...

  9. 2 Servlet基础

    作者:禅楼望月(http://www.cnblogs.com/yaoyinglong) 1. 从浏览器访问Servlet的流程 刚才发现,这里的图片不能正常显示,所以我给个链接,大家可以下载下来看从浏 ...

随机推荐

  1. TCP的状态

    在TCP层,有个FLAGS字段,这个字段有以下几个标识:SYN, FIN, ACK, PSH, RST, URG. 其中,对于我们日常的分析有用的就是前面的五个字段. 它们的含义是: SYN表示建立连 ...

  2. ORACLE11G常用函数

    1 单值函数 1.1 日期函数 1.1.1 Round [舍入到最接近的日期](day:舍入到最接近的星期日) select sysdate S1, round(sysdate) S2 , round ...

  3. jquery find()和filter()的区别

    在写js查找当前标签下某一子元素的子元素集合时,用到了此方法 $(".flyout-trigger").mouseover(function(){ var maxnum=$(thi ...

  4. hibernate安装和配置和第一个Hibernate应用

    ssh的各个版本要搭配好,struts2.3一般搭配hibernate4.x,我下的是4.3. Hibernate4的改动较大只有spring3.1以上版本能够支持,Spring3.1取消了Hiber ...

  5. java数组复制的方式和效率比较

    java中,数组的复制有以下三种方式: 1. 调用System.arraycopy(Arrays.copyOfRange可以当作第四种,但是底层调用的是System.arraycopy,所以,认为是同 ...

  6. Ice笔记－利用Ice::Application类简化Ice应用

    Ice笔记-利用Ice::Application类简化Ice应用 作者:ydogg,转载请申明. 在编写Ice相关应用时,无论是Client还是Server端,都必须进行一些必要的动作,如:Ice通信 ...

  7. 瑞柏匡丞：用全局观开发App

    不管是互联网金融还是生活服务,移动端APP开发都是各大商家关注的重点.众多研发机构的涌入,使得APP的市场环境已经再无技术壁垒可言.在APP市场中,神州锐达的研发水准和客户认同度,一直受到业内人士的称 ...

  8. PKU 1050-To The Max(找矩形内元素最大和）

    Given a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous s ...

  9. ObjectOutputStream 追加写入读取错误

    摘自http://blog.csdn.net/mitkey/article/details/50274543 问题描述: 用类ObjectOutputStream向文件写读对象时,碰到一个问题:新建一 ...

  10. Android窗口管理服务WindowManagerService的简要介绍和学习计划

    在前一个系列文章中,我们从个体的角度来分析了Android应用程序窗口的实现框架.事实上,如果我们从整体的角度来看,Android应用程序窗口的 实现要更复杂,因为它们的类型和作用不同,且会相互影响. ...