CODEWITHSUNDEEP
javajsfparametersjavabeans
Daniel Szalay
Daniel Szalay

Reputation: 4101

Passing a backing bean instance as parameter for another backing bean method

After the user fills my backing bean with info through the forms, I want to process the instance in Java code (such as JAXB marshalling).

So at the moment i'm doing this like so:

<% OtherBean.method(myBackingBean); %>

which is - if i'm right - not quite an up to date solution :) So how can I make this happen in a 'better' way?

Thanks in advance, Daniel.

Upvotes: 0

Views: 1950

Answers (2)

McDowell
McDowell

Reputation: 108859

One solution is to add an action method to the bean - it is possible to have it process 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 processed using the 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>

Note the method binding #{simpleBean.processData}. This must be a public method that takes no arguments and returns a String argument (which can be used for page navigation if desired).

This isn't the only way to go about this, but it is fairly straightforward.

Upvotes: 3

mR_fr0g
mR_fr0g

Reputation: 8722

you could have one backing bean as an instance variable of the other bean. and configure it in spring or whatever you are using.

Upvotes: 0

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