Jsp --- EL accessors

Last Update:2013-12-09 Source: Internet

Author: User

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Use accessors to read data from JavaBean

01
Package com. javaweb. ch08;
02
Import java. util .*;
03
// A simple JavaBean example
04
Public class Person {
05
// Name attribute
06
Private String name;
07
// Age attributes
08
Private int age;
09
// Sex attributes
10
Private String sex;
11
// Friends attributes
12
Private ArrayList friends;
13
// Construction method without Parameters
14
Public Person (){
15
}
16
// Custom Constructor
17
Public Person (String name, int age, String sex ){
18
This. name = name;
19
This. age = age;
20
This. sex = sex;
21
}
22
// Obtain the attribute value of name
23
Public String getName (){
24
Return name;
25
}
26
// Get the age property value
27
Public int getAge (){
28
Return age;
29
}
30
// Obtain the sex property value
31
Public String getSex (){
32
Return sex;
33
}
34
// Set the name attribute
35
Public void setName (String name ){
36
This. name = name;
37
}
38
// Set the age Attribute Value
39
Public void setAge (int age ){
40
This. age = age;
41
}
42
// Set the sex property value
43
Public void setSex (String sex ){
44
This. sex = sex;
45
}
46
// Set the value of friends
47
Public void setFriends (ArrayList friends ){
48
This. friends = friends;
49
}
50
// Obtain the attribute value of friends
51
Public ArrayList getFriends (){
52
Return friends;
53
}
54
}
01
<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
02
<% @ Page import = "java. util. *, com. javaweb. ch08. *" %>
03
<! DOCTYPE html>
04
<Html>
05
<Head>
06
<Title> set attributes in JavaBean </title>
07
</Head>
08
<Body>
09
<%
10
// Instantiate a Person
11
Person person = new Person ("zhangdapeng", 24, "male ");
12
// Create a friends instance
13
ArrayList friends = new ArrayList ();
14
// Add Value
15
Friends. add ("wang wu ");
16
Friends. add ("li si ");
17
Person. setFriends (friends );
18
// Stored in the session range
19
Session. setAttribute ("person", person );
20

21
%>
22
<A href = "GetJavaBean. jsp"> jump to GetJavaBean. jsp </a>
23
</Body>
24
</Html>
01
<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
02
<! DOCTYPE html>
03
<Html>
04
<Head>
05
<Title> obtain the attribute value in JavaBean </title>
06
</Head>
07
<Body>
08
Name: $ {sessionScope. person. name} 
09
Age: $ {sessionScope. person. age} 
10
Gender: $ {sessionScope. person. sex} 
11
Friend: $ {sessionScope. person. friends [0]}, $ {sessionScope. person. friends [1]} 
12
</Body>
13
</Html>
Use memory to read data in Map
01
<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
02
<% @ Page import = "java. util. *, com. javaweb. ch08. *" %>
03
<! DOCTYPE html>
04
<Html>
05
<Head>
06
<Title> set the Map page </title>
07
</Head>
08
<Body>
09
<%
10
// Create a HashMap
11
HashMap userInfo = new HashMap ();
12
// Set the value in HashMap
13
UserInfo. put ("username", "zhangdapeng ");
14
UserInfo. put ("password", "zhnagda123 ");
15
// Store the value in the session range
16
Session. setAttribute ("userInfo", userInfo );
17

18
%>
19
<A href = "GetMapDemo. jsp"> jump to GetMapDemo. jsp </a>
20
</Body>
21
</Html>
01
<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
02
<! DOCTYPE html>
03
<Html>
04
<Head>
05
<Title> use memory to read data in map </title>
06
</Head>
07
<Body>
08
Username: $ {sessionScope. userInfo. username} 
09
Password: $ {sessionScope. userInfo. password} 
10
</Body>
11
</Html>
Use memory to read data in the array
01
<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
02
<% @ Page import = "java. util. *, com. javaweb. ch08. *" %>
03
<! DOCTYPE html>
04
<Html>
05
<Head>
06
<Title> set the Array page </title>
07
</Head>
08
<Body>
09
<%
10
String [] names = {"zhangda1", "zhangda2", "zhangda3 "};
11
// Store the value in the session range
12
Session. setAttribute ("names", names );
13

14
%>
15
<A href = "GetMapDemo. jsp"> jump to GetArrayDemo. jsp </a>
16
</Body>
17
</Html>
01
<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
02
<! DOCTYPE html>
03
<Html>
04
<Head>
05
<Title> use memory to read data in map </title>
06
</Head>
07
<Body>
08
Username 1: $ {sessionScope. names [0]} 
09
Username 2: $ {sessionScope. names [1]} 
10
</Body>
11
</Html>
Complex applications of memory
01
<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
02
<% @ Page import = "java. util. *, com. javaweb. ch08. *" %>
03
<! DOCTYPE html>
04
<Html>
05
<Head>
06
<Title> set the Array page </title>
07
</Head>
08
<Body>
09
<%
10
ArrayList <Person> persons = new ArrayList <Person> ();
11

12
Person person1 = new Person ("wang wu", 24, "male ");
13
Person person2 = new Person ("wang liu", 24, "female ");
14

15
Persons. add (person1 );
16
Persons. add (person2 );
17

18
Session. setAttribute ("persons", persons );
19

20
%>
21
<A href = "GetMapDemo. jsp"> jump to GetArrayDemo. jsp </a>
22
</Body>
23
</Html>

01
<% @ Page language = "java" contentType = "text/html; charset = gb2312" %>
02
<! DOCTYPE html>
03
<Html>
04
<Head>
05
<Title> use memory to read data in map </title>
06
</Head>
07
<Body>
08
Username 1: $ {sessionScope. persons [0]. name}, $ {sessionScope. persons [0]. age}, $ {sessionScope. persons [0]. sex} 
09
Username 2: $ {sessionScope. persons [1]. name}, $ {sessionScope. persons [1]. age}, $ {sessionScope. persons [1]. sex} 
10
</Body>
11
</Html>

From Zhang Dapeng's blog

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More