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Java web：jsp，個人注意事項，創(chuàng)建servlet，HTTP協(xié)議，學(xué)習(xí)筆記PPT【詩書畫唱】

2020-09-16 21:15 作者:詩書畫唱  | 我要投稿

1、創(chuàng)建一個servlet，調(diào)用這個servlet以后要求控制臺打印出服務(wù)器的時間SimpleDateFormat轉(zhuǎn)換打印出2000-9-16 9:13:16。（個人的注意事項：用快捷方式生成的servlet，不必修改web.xml【自己手建的servlet，要修改web.xml】）


package JSP;


import java.io.IOException;

import java.text.SimpleDateFormat;

import java.util.Date;


import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;


/**

?* Servlet implementation class SimpleDateFormat

?*/

@WebServlet("/s")

public class NowTime extends HttpServlet {

private static final long serialVersionUID = 1L;

? ? ? ?

? ? /**

? ? ?* @see HttpServlet#HttpServlet()

? ? ?*/

? ? public NowTime() {

? ? ? ? super();

? ? ? ? // TODO Auto-generated constructor stub

? ? }


/**

* @see HttpServlet#doGet(HttpServletRequest request,?

* HttpServletResponse response)

*/

protected void doGet(HttpServletRequest?

request, HttpServletResponse response)?

throws ServletException, IOException {

// TODO Auto-generated method stub

this.doPost(request, response);

}


/**

* @see HttpServlet#doPost(HttpServletRequest?

* request, HttpServletResponse response)

*/

protected void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

Date date=new Date();?

//這個方法也是需要導(dǎo)包的?

//注意第二個mm要大寫,不然月份會有錯誤?

SimpleDateFormat sdf=new SimpleDateFormat("yyy-MM-dd hh:mm:ss");?

System.out.println(sdf.format(date));?


}


}


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

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

? <display-name>ZCJSP</display-name>

? <welcome-file-list>

? ? <welcome-file>index.html</welcome-file>

? ? <welcome-file>index.htm</welcome-file>

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

? ? <welcome-file>default.html</welcome-file>

? ? <welcome-file>default.htm</welcome-file>

? ? <welcome-file>default.jsp</welcome-file>

? </welcome-file-list>

</web-app>



2、創(chuàng)建一個servlet，調(diào)用這個servelt以后要求控制臺打印出一個隨機數(shù)。


package JSP;


import java.io.IOException;

import java.util.Random;


import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



/**

?* Servlet implementation class Random

?*/

@WebServlet("/Random")

public class RandomNum extends HttpServlet {

private static final long serialVersionUID = 1L;

? ? ? ?

? ? /**

? ? ?* @see HttpServlet#HttpServlet()

? ? ?*/

? ? public RandomNum() {

? ? ? ? super();

? ? ? ? // TODO Auto-generated constructor stub

? ? }


/**

* @see HttpServlet#doGet(HttpServletRequest

*? request, HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request,

HttpServletResponse response)?

throws ServletException, IOException {

// TODO Auto-generated method stub

this.doPost(request, response);

}


/**

* @see HttpServlet#doPost(HttpServletRequest?

* request, HttpServletResponse response)

*/

protected void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

// TODO Auto-generated method stub



Random R=new Random();

int num=R.nextInt(666);

System.out.println(num);

}


}




3、創(chuàng)建一個servlet，調(diào)用這個servlet以后要求控制臺打印出hello world。


package JSP;


import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;


/**

?* Servlet implementation class Hello

?*/

@WebServlet("/Hello")

public class Hello extends HttpServlet {

private static final long serialVersionUID = 1L;

? ? ? ?

? ? /**

? ? ?* @see HttpServlet#HttpServlet()

? ? ?*/

? ? public Hello() {

? ? ? ? super();

? ? ? ? // TODO Auto-generated constructor stub

? ? }


/**

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub


this.doPost(request, response);

}


/**

* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

*/

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

System.out.println("hello world");

}


}


4、創(chuàng)建一個servlet，調(diào)用這個servlet以后要求控制臺打印出今天是星期幾。

package JSP;


import java.io.IOException;

import java.util.Calendar;


import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;


/**

?* Servlet implementation class Week

?*/

@WebServlet("/Week")

public class Week extends HttpServlet {

private static final long serialVersionUID = 1L;

? ? ? ?

? ? /**

? ? ?* @see HttpServlet#HttpServlet()

? ? ?*/

? ? public Week() {

? ? ? ? super();

? ? ? ? // TODO Auto-generated constructor stub

? ? }


/**

* @see HttpServlet#doGet(HttpServletRequest request,?

* HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request,?

HttpServletResponse response) throws?

ServletException, IOException {

// TODO Auto-generated method stub


this.doPost(request, response);

}


/**

* @see HttpServlet#doPost(HttpServletRequest request,

*? HttpServletResponse response)

*/

protected void doPost(HttpServletRequest request,?

HttpServletResponse response)

throws ServletException,

IOException {

String Array[]={"星期日","星期一","星期二",

"星期三","星期四","星期五","星期六"};//字符串?dāng)?shù)組

Calendar rightNow=Calendar.getInstance();

/**

? ?* 總結(jié)：

* getInstance這個方法在單例模式用的甚多，為了避免對內(nèi)存造成浪費，

* 直到需要實例化該類的時候才將其實例化，所以用getInstance來獲取該對象，

* 至于其他時候，也就是為了簡便而已，為了不讓程序在實例化對象的時候，

* 不用每次都用new關(guān)鍵字，索性提供一個instance方法，不必一執(zhí)行這個類就

* 初始化，這樣做到不浪費系統(tǒng)資源！單例模式 可以防止 數(shù)據(jù)的沖突，節(jié)省內(nèi)存空間*/

int XiaBiao=rightNow.get(rightNow.DAY_OF_WEEK);//獲取時間

System.out.println("今天是"+Array[XiaBiao-1]);

//通過數(shù)組把周幾輸出

//------------------------------------------------------------


}}




5、創(chuàng)建一個servlet，調(diào)用這個servlet以后要求控制臺打印出一個九九乘法口訣表。

代碼不準(zhǔn)寫在同一個servlet類中，不準(zhǔn)使用注解



package JSP;


import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;


/**

?* Servlet implementation class NineNine

?*/

@WebServlet("/NineNine")

public class NineNine extends HttpServlet {

private static final long serialVersionUID = 1L;

? ? ? ?

? ? /**

? ? ?* @see HttpServlet#HttpServlet()

? ? ?*/

? ? public NineNine() {

? ? ? ? super();

? ? ? ? // TODO Auto-generated constructor stub

? ? }


/**

* @see HttpServlet#doGet(HttpServletRequest request,

*? HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request,?

HttpServletResponse response) throws?

ServletException, IOException {

// TODO Auto-generated method stub

this.doPost(request, response);

}


/**

* @see HttpServlet#doPost(HttpServletRequest request,

* \ HttpServletResponse response)

*/

protected void doPost(HttpServletRequest request,?

HttpServletResponse response) throws

ServletException, IOException {



// TODO Auto-generated method stub

for(int j=1;j<=9;j++){


for(int i=1;i<=j;i++){System.out.print




(j+"*"+i+"="+i*j+" ");}System.out.println




();


}



}


}








servlet小型應(yīng)用程序【[?s?rvl?t]】



例子：

手動創(chuàng)建一個servlet，運行它的時候在后臺打印Hello world.

1
2



3
4



5
6
7
8
9


或按10的步驟鼠標(biāo)右鍵等后運行代碼：

10

下面是運行的結(jié)果：

11

用快捷鍵或快捷方式選項等創(chuàng)建一個servlet：


1

或者點other后點Servlet：


2
3
4
5

快捷方式自動生成訪問路徑，web.xml中的就可以不用寫訪問路徑的部分：

6
7
8


——————

1

或

2
3
4
5
6
7
8
9

運行后：

10
11
12
13

————————


HTTP協(xié)議的get和post的請求方式：


Servlet簡介：



關(guān)于打開和編輯xml文件的方法：

1
2


關(guān)于HTTP協(xié)議的PPT：

POST 方法

用于發(fā)送敏感信息（如信用卡號）或要保存到數(shù)據(jù)庫中的信息

請求的頁面不能設(shè)置為書簽或不能通過電子郵件發(fā)送

發(fā)送的數(shù)據(jù)沒有大小限制


SERVLET開發(fā)入門PPT：

1
2
3
4
5
6
7
8
9
10
11
12
13
14



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Java web：jsp，個人注意事項，創(chuàng)建servlet，HTTP協(xié)議，學(xué)習(xí)筆記PPT【詩書畫唱】的評論 (共 條)

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