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为什么当我将类调用到javabean中时,java反射不起作用?

java-ee-6 javabeans reflection jakarta-ee java

Abder KRIMA · 技术社区 · 10 年前

我尝试用java反射显示所有包的名称,当我使用主方法进行测试时,它工作得很好:

获取whitch的所有包名的方法位于名为test1.java的类中:

 public Set<String> findAllPackages(String packagebase) {
    List<ClassLoader> classLoadersList = new LinkedList<ClassLoader>();
    classLoadersList.add(ClasspathHelper.contextClassLoader());
    classLoadersList.add(ClasspathHelper.staticClassLoader());
    Reflections reflections = new Reflections(
            new ConfigurationBuilder()
                    .setScanners(new SubTypesScanner(false),
                            new ResourcesScanner())
                    .setUrls(
                            ClasspathHelper.forClassLoader(classLoadersList
                                    .toArray(new ClassLoader[0])))
                    .filterInputsBy(
                            new FilterBuilder().include(FilterBuilder
                                    .prefix(packagebase))));
    Set<Class<? extends Object>> classes = reflections
            .getSubTypesOf(Object.class);
    Set<String> packageNameSet = new TreeSet<String>();
    for (Class classInstance : classes) {
        packageNameSet.add(classInstance.getPackage().getName());
    }
    return packageNameSet;
}

我在同一类中的主要方法:

    public static void main(String[] args) throws ClassNotFoundException,
        IOException {
    for (String pack : new test1().findAllPackages("org.basepackage")) {
        System.out.println(pack);
    }
}

当我尝试将我的方法放入我的managedbean或只是将我的test1.java类安装到我的menagedbean中时,它不起作用,当我调试时,我发现它没有进入findAllPackages的循环。

我的豆子看起来像:

 @Named
@ViewScoped
public class mymanagedbean implements Serializable {
private List<SelectItem> packageNameItems;
 @PostConstruct
public void init() {        
    try {
        packageNameItems=new ArrayList<SelectItem>();
        packageNameItems=(new test1().loadpackageName("org.basepackage"));
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

我有吸气器&managedbean中packageNameItems的setters

我的jsf看起来像:

 <h:form>
                <h:selectOneMenu value="#{mymanagedbean.packageName}">
                    <f:selectItems value="#{mymanagedbean.classNameItems}"/>
                </h:selectOneMenu>
            </h:form>

你知道吗?

1 回复 | 直到 10 年前

Abder KRIMA 10 年前

我解决了这个问题:

public Set<String> findAllPackages(String packagebase) {
List<ClassLoader> classLoadersList = new LinkedList<ClassLoader>();
classLoadersList.add(ClasspathHelper.contextClassLoader());
classLoadersList.add(ClasspathHelper.staticClassLoader());
Reflections reflections = new Reflections(
        new ConfigurationBuilder()
                .setScanners(new SubTypesScanner(false),
                        new ResourcesScanner())
                .setUrls(
                        ClasspathHelper.forClassLoader(classLoadersList)))
                .filterInputsBy(
                        new FilterBuilder().include(FilterBuilder
                                .prefix(packagebase))));
Set<Class<? extends Object>> classes = reflections
        .getSubTypesOf(Object.class);
Set<String> packageNameSet = new TreeSet<String>();
for (Class classInstance : classes) {
    packageNameSet.add(classInstance.getPackage().getName());
}
return packageNameSet;}