Passing a backup bean instance as a parameter to another backing bean method
After the user fills my backing bean with information via forms, I want to process the instance in Java code (like a JAXB sort).
So at the moment I am doing it like this:
<% OtherBean.method(myBackingBean); %>
which is - if I'm right - not really a topical solution :) So how can I make this "better"?
Thanks in advance Daniel.
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2 answers
One solution is to add an action method to the bean - perhaps it handles it itself.
For example, this simple bean:
public class SimpleBean {
private String forename;
private String surname;
public String processData() {
// TODO: real work
System.out.println("forename=" + forename);
System.out.println("surname=" + surname);
return null; // optional navigation rule
}
public String getForename() {
return forename;
}
public void setForename(String forename) {
this.forename = forename;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
}
... defined in WEB-INF / faces-config.xml:
<managed-bean>
<managed-bean-name>simpleBean</managed-bean-name>
<managed-bean-class>simplebean.SimpleBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
... can be handled with this JSP:
<?xml version="1.0" encoding="UTF-8" ?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.0"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<jsp:directive.page language="java"
contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" />
<jsp:text>
<![CDATA[<?xml version="1.0" encoding="UTF-8" ?>]]>
</jsp:text>
<jsp:text>
<![CDATA[<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">]]>
</jsp:text>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Enter Name</title>
</head>
<body>
<f:view>
<h:form>
<h:panelGrid columns="2">
<h:outputText value="forename:" />
<h:inputText id="it1" value="#{simpleBean.forename}" />
<h:outputText value="surname:" />
<h:inputText id="it2" value="#{simpleBean.surname}" />
</h:panelGrid>
<h:commandButton action="#{simpleBean.processData}"
value="process" />
</h:form>
</f:view>
</body>
</html>
</jsp:root>
Notice the # {simpleBean.processData} binding method. It must be a public method that takes no arguments and returns a String argument (which can be used to navigate the pages if needed).
This isn't the only way to do it, but it's pretty simple.
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