javabeans | 易学教程

How to copy properties from a bean to another bean in different class? [duplicate]

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This question already has an answer here: Copy POJO content from one bean to another 7 answers I have two java class with same properties names.How Can I copy all the properties to another bean filled with data.I don't want to use the traditional form to copy properties because I have a lot of properties. Thanks in advance. 1 class @ManagedBean @SessionScoped public class UserManagedBean implements Serializable { private static final long serialVersionUID = 1L; private String userSessionId; private String userId; private String name; private String adress; ...................... 2 class public

What's the point of beans?

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问题 I've bean doing some JSP tutorials and I don't understand what the point of a bean class is. All it is, is get and set methods. why do we use them? public class UserData { String username; String email; int age; public void setUsername( String value ) { username = value; } public void setEmail( String value ) { email = value; } public void setAge( int value ) { age = value; } public String getUsername() { return username; } public String getEmail() { return email; } public int getAge() {

Javabean convention - method naming for property gId

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问题 If I have a property 'gId' in my Java class what should the accessor method be named as? getGId is what I assume. If there were a property gURL I think it would be getGURL , which kind of looks ugly (not referring to the alternative spelling of girl though). If the property was just url the method name getUrl is good on the eye and yeah I would not name the property as URL in the first place which would make the accessor ugly again - getURL I remember reading from the Javabean Specification

Executing the ActionListener of a (Primefaces) menu item leads to an IllegalStateException

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问题 In JSF backed bean I got an IllegalStateException when the programmatically added action listener of a programmatically added Primefaces menu item is called. I tried both request and session scope but both are leading to the same error. Obviously there's need -- according to the stack trace -- to restore the view when an action listener is executed and I let my ToolbarBean implement Serializable with no different effect. What should I consider in order to get this to work? User interface

Am I misunderstanding the JavaBean method naming convention or is this an anomoly?

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问题 I have mysterious happenings in my code. Here's the snippet from the bean: public List<HelpContentsFrag> getCFrags() { return cFrags; } public void setCFrags(List<HelpContentsFrag> frags) { cFrags = frags; } Here's the snippet from my view code (tag file) cFrags:[${topic.cFrags}] where topic is an object of the bean type. Here's the error: javax.el.PropertyNotFoundException: Property 'cFrags' not found on type com.company.beans.BeanClass One additional thing to consider. There is a subtle

how to reference a bean of another xml file in spring

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I have a Spring bean defined in an xml file. I want to reference it from another xml file. How can I go about it? You have a couple of options: Import <import resource="classpath:config/spring/that-other-xml-conf.xml"/> <bean id="yourCoolBean" class="org.jdong.MyCoolBean"> <property name="anotherBean" ref="thatOtherBean"/> </bean> Include in the ApplicationContext Construction Make both files a part of your ApplicationContext when you create it => then no import is needed. For example if you need it during testing: @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration({ "classpath:META

Spring - using static final fields (constants) for bean initialization

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is it possible to define a bean with the use of static final fields of CoreProtocolPNames class like this: <bean id="httpParamBean" class="org.apache.http.params.HttpProtocolParamBean"> <constructor-arg ref="httpParams"/> <property name="httpElementCharset" value="CoreProtocolPNames.HTTP_ELEMENT_CHARSET" /> <property name="version" value="CoreProtocolPNames.PROTOCOL_VERSION"> </bean> public interface CoreProtocolPNames { public static final String PROTOCOL_VERSION = "http.protocol.version"; public static final String HTTP_ELEMENT_CHARSET = "http.protocol.element-charset"; } If it is possible,

Saving a PNG file on a server in a Java bean, using JSTL

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问题 I am writing an update page in JSTL where the user inputs some numbers. I then call a java bean - passing the numbers as parameters - which, using JFreeChart, creates a PNG image. All of this works fine when I save the file directly on my hard drive using ImageIO.write(myBufferedImage, "png", new File("C:/testChart.png")); I can also save the image to my tomcat directory and view it when I am running the website on my localhost. However, once this code is up on a server that is not my local

Default method in interface in Java 8 and Bean Info Introspector

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问题 I have a little problem with default methods in Interface and BeanInfo Introspector. In this example, there is interface: Interface public static interface Interface { default public String getLetter() { return "A"; } } and two classes ClassA and ClassB: public static class ClassA implements Interface { } public static class ClassB implements Interface { public String getLetter() { return "B"; } } In main method app prints PropertyDescriptors from BeanInfo: public static String formatData

How do I print a list of strings contained within another list in iReport?

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I am creating a simple reporting program using java and iReport (from jasper), which is supposed to create a report in pdf showing PCs with their IP address, their location, whether it's idle or not at the moment (handled by another system), and a list of projects it is currently attached to (managed elsewhere, too). I'm using iReport for this matter, and have created a dummy collection generating class as follows: public class PCReports { public static java.util.Collection PC_collection; public static java.util.Collection generateCollection() { PC_collection = new ArrayList<PCLineDTO>();