Question

此时,我正试图创建一种通知程序,在附加说明的类别中形成一种称为“敲诈”的方法。为此,我设立了以下职位:

package ro.Gabriel.AnnotationTest;

import com.google.auto.service.AutoService;

import javax.annotation.processing.*;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.TypeElement;
import javax.tools.JavaFileObject;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Set;

@AutoService(javax.annotation.processing.Processor.class)
@SupportedAnnotationTypes("ro.Gabriel.AnnotationTest.CustomGetter")
@SupportedSourceVersion(SourceVersion.RELEASE_8)
public class CustomGetterProcessor extends AbstractProcessor {

    @Override
    public synchronized void init(ProcessingEnvironment processingEnv) {
        super.init(processingEnv);
    }

    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
        for (Element element : roundEnv.getElementsAnnotatedWith(CustomGetter.class)) {
            if (element.getKind() == ElementKind.CLASS) {
                generateGetValueMethod((TypeElement) element);
            }
        }
        return true;
    }

    private void generateGetValueMethod(TypeElement classElement) {
        String className = classElement.getSimpleName().toString();
        String packageName = processingEnv.getElementUtils().getPackageOf(classElement).getQualifiedName().toString();

        String generatedClassName = className + "Generated";
        
        String generatedCode = String.format(
                "package %s;

" +
                        "public class %s {
" +
                        "    public String getValue() {
" +
                        "        return "Hello from getValue method!";
" +
                        "    }
" +
                        "}
",
                packageName, generatedClassName
        );

        try {
            JavaFileObject fileObject = processingEnv.getFiler().createSourceFile(
                    packageName + "." + generatedClassName, classElement);
            try (PrintWriter writer = new PrintWriter(fileObject.openWriter())) {
                writer.print(generatedCode);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这里是:

package ro.Gabriel.AnnotationTest;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.SOURCE)
@Target(ElementType.TYPE)
public @interface CustomGetter { }

In the resources folder I created the following directory: META-INF/services in the file resources/META-INF/services I created the following file: javax.annotation.processing.Processor

http://www.un.org。我增加了我的处理器:ro.Gabriel.Annotation.CustomGettercessor。

在<代码>pom.xml上,文件一增加了<代码>@Autoservice(Processor.class)的以下存放处:

        <dependency>
            <groupId>com.google.auto.service</groupId>
            <artifactId>auto-service</artifactId>
            <version>1.0.1</version>
            <scope>provided</scope>
        </dependency>

现在我设立了以下类别:

package ro.Gabriel.AnnotationTest;

@CustomGetter
public class ExampleClass {

}

ExampleClass e = new ExampleClass();
String value = e.getValue();// this method is not in the ExampleClass class even if it is annotated with @CustomGetter

我的问题是,为什么在例类动物中不出现<代码>getValue()方法?

我认为,必须在<代码>m.xml上建立某些组合,但我不知道如何。

谁能帮助我?

Thanks!

Answer 1

在您的设立之后,您最后将分两门<>ExampleClass:首先,一名阁下附加说明,第二门与制作的炉.。这可能会造成令人不快的结果,但没有任何用处。

众所周知,通知处理过程很短,无法修改现有的源代码。

Tools/libraries like Lombok that generates methods like getters and setters on the fly will use other means to get their work done.

友情链接