javabeans

问题 I have a set of three servlets, each one of them has a form with radio buttons that passes its values to the next servlet. What I am trying to do is to make a JavaBean class to use with the servlets and keep the state of them and the choices of the radio buttons while going from one servlet to another. Could anyone suggest some sample code for the JavaBean please? Here is some of the first servlet code: (The other two servlets have same code for other questions) protected void processRequest

问题 Usually JavaPractices.com is a good site with good idea's, but this one troubles me: JavaBeans are bad. The article cites several reasons, mainly that the term JavaBean means "A Java Bean is a reusable software component that can be manipulated visually in a builder tool." not Data storage, violates certain patters, and is more complex. Now I can agree with the last one, but in my eyes JavaBeans in a list makes a lot more sense than nested Maps. The article claims that database mapping

问题 I am very curious about the possibility of providing immutability for java beans (by beans here I mean classes with an empty constructor providing getters and setters for members). Clearly these classes are not immutable and where they are used to transport values from the data layer this seems like a real problem. One approach to this problem has been mentioned here in StackOverflow called "Immutable object pattern in C#" where the object is frozen once fully built. I have an alternative

问题 I think the best way to resolve this problem is just to paste my code : Selector bean @ManagedBean(name="selector") @RequestScoped public class Selector { @ManagedProperty(value="#{param.page}") private String page; private String profilePage; @PostConstruct public void init() { if(profilePage==null || profilePage.trim().isEmpty()) { this.profilePage="main"; } if(page==null || page.trim().isEmpty()) { this.page="homepage"; } } public String getProfilePage() { System.out.println("GET ="

问题 I've implemented a converter for Apache BeanUtils library for converting String to an enum constant: class EnumConverter implements Converter { @Override public <T> T convert(Class<T> tClass, Object o) { String enumValName = (String) o; Enum[] enumConstants = (Enum[]) tClass.getEnumConstants(); for (Enum enumConstant : enumConstants) { if (enumConstant.name().equals(enumValName)) { return (T) enumConstant; } } throw new ConversionException(String.format("Failed to convert %s value to %s class

问题 Can an EJB bean implement multiple user defined interfaces, except business interfaces (@Local, @Remote) or No-Interface view (@LocalBean)? For example define two interfaces UserInterface1 , UserInterface2 , with no annotation. Is this legal to implement: @Stateless public class MyBean implements UserInterface1, UserInterface2 { ... Then I have another confusion: @Stateless public class MyBean implements Runnable { ... //inside I won't try to manage thread } Is this legal or illegal, I found

问题 I want to use JavaFX properties for UI binding, but I don't want them in my model classes (see Using javafx.beans properties in model classes). My model classes have getters and setters, and I want to create properties based on those. For example, assuming an instance bean with methods String getName() and setName(String name) , I would write SimpleStringProperty property = new SimpleStringProperty(bean, "name") expecting that property.set("Foobar") would trigger a call to bean.setName . But

问题 I want to use JavaFX properties for UI binding, but I don't want them in my model classes (see Using javafx.beans properties in model classes). My model classes have getters and setters, and I want to create properties based on those. For example, assuming an instance bean with methods String getName() and setName(String name) , I would write SimpleStringProperty property = new SimpleStringProperty(bean, "name") expecting that property.set("Foobar") would trigger a call to bean.setName . But

问题 I have below class StaticDataCachesServerBean which is autowired by it's interface i.e. @Autowired private StaticDataCaches staticDataCaches; in some another class I already created instance of sdcAutoAssignmentRuleCache in init method of StaticDataCachesServerBean class. As per my understanding if annotate sdcAutoAssignmentRuleCache with @Bean won't make any impact as instance is already created and same is returned when method is called. Is my understanding correct? What will happen if I

问题 I'm developing an application using Struts 1.3.10 I need to iterate 2 lists in order to print the result in jsp. The first list iteration needs to be used to select elements from list 2. For that reason I'm trying to do like this: <logic:iterate name="bodyForm" property="domainList" id="domList"> <div><h1><bean:write name="domList" property="domain"/><h1> <ul> <logic:iterate name="bodyForm" property="locationsList" id="locList" > <logic:equal name="locList" property="domain" value="<bean