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Introduction to JSP property

Web development, programming languages, Software testing & others

Syntax

The syntax used by the JSP property is :

<jsp:setProperty name="Name_to_identify_bean" <jsp:getProperty name="Name_to_identify_bean" <jsp:useBean

The “setProperty” or “getProperty” after colon JSP is the identifier for the compiler. By this compiler identifies that the property functionality of JSP has been used. “Name” tag is used to set the name to identify the JAVA bean, which will carry the property name along with values. “Property” is used to assign property names.

The useBean tag mentioned in the end is used to locate the remotely located bean, which can then be used for processing of JAVA beans. Note here that “name” on property and “id” in usebean JSP tags should be the same.

How does property work in JSP?

Name: This is a mandatory attribute. This attribute is used to identify the EJB. Refer to syntax carefully as this name should match to JSPBean’s name.

Property: This is a mandatory attribute. This defines which properties should be set. For example, if “*” is given as a value for this parameter, then all the properties are set as per the setter method in EJB.

Param: This attribute is optional. This attribute is equal to the request parameter name. This parameter is getting the incoming value that would be assigned to the property. “Param” and “Value” can not be used together as both of these attributes are used to assign value to the property in the tag itself, although the method of assigning values is different.

Value: This attribute is optional. This attribute is used to set a value to the property in the tag itself rather than fetching it from some other place. If this attribute is not present or the value is zero, then the “setProperty” property is being ignored by the compiler.

EJB: A JAVA bean should be defined with getting and set methods that would take the property values fetched from property tags and then assign them to the variables. These variables are sent again wherever required. We can understand more about its working with the help of an example provided in the below section.

Examples of JSP property

This is an example where we will create an index page with a form that collects email id, name, and password and then finally displays it in the output by carrying the user input name, password and email via properties. There are some files to be created to accomplish the task.

File: Index.html

File: Test1.java package test1JSP; public class Test1 { private String n,p,e; public String getName() { return n; } public void setName(String name) { this.n = name; } public String getPassword() { return p; } public void setPassword(String password) { this.p = password; } public String getEmail() { return e; } public void setEmail(String email) { this.e = email; } } File: Test1.Class / Compiled from chúng tôi (version 12 : 56.0, super bit) public class test1JSP.Test1 { private java.lang.String n; private java.lang.String p; private java.lang.String e; public Test1(); 0 aload_0 [this] 1 invokespecial java.lang.Object() [12] 4 return Line numbers: [pc: 0, line: 3] Local variable table: [pc: 0, pc: 5] local: this index: 0 type: test1JSP.Test1 File: useBean2.jsp

Output:

Explanation:

In this example, three files are created named “Index.html”, “useBean2.jsp” and “Test1.java”. “Index.html” is simply the web page to input the values. Here the form is used to collect the details required. The “action” attribute in the form tag links this static HTML page to the dynamic JSP page named “useBean2.jsp”. This JSP page sets the property with the help of JSP property tags. One thing to notice here is that there is a “useBean” tag also defined on the JSP page, which establishes a link between the JSP page and the JAVA class. The name of the properties, the id of useBean tag is the same, which is “u”. “setProperty” sets all the properties with the value fetched from the HTML page and “getProperty” gets the value which is set via the “setProperty” tag. In the background, the JSP bean connects with the JAVA class page “Test1.java” and uses get and set methods to set the values. Get the method to fetch the value and displays it on the output screen.

Conclusion

JSP property is used commonly to streamline the data flow between multiple pages in the backend when we run any web application. In addition, it helps in enhancing user interactive sessions by the use of dynamic web content loading. One of the most useful tools for front end developers.