我是新手的反思.有什么办法可以检测调用特定方法的位置吗？例如：
public class MyClass {
public static void method(){
//DO SOMETHING
}
}
public class Test {
public test(){
MyClass.method();
}
}
public class MyProcessor extends AbstractProcessor {
public boolean process(Set<? extends TypeElement> annotations,RoundEnvironment roundEnv) {
Method method = MyClass.class.getDeclaredMethod("method");
Class classWhereMethodIsInvoked = obtainClassWhereMethodIsInvoked(method);
}
public Class obtainClassWhereMethodIsInvoked(Method method) {
//here I want to search one class that invoke that method,in this case Test.class
}
}
是这样可能的,还是我疯了？
解决方法
是的,如果你真的想要它是可行的您可以使用classLoader来搜索类路径,并通过所有类文件扫描方法名称.下面是一个非常简单的例子来说明它是可行的.在下面的例子中,我发现在这个类中使用了“println”方法.从本质上讲,您可以将示例中的一个文件的范围扩展到所有类文件.
public class SearchClasses {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws FileNotFoundException {
// InputStream is = SearchClasses.class.getClassLoader().getResourceAsStream("resources.SearchClasses.class");
InputStream is = new FileInputStream(new File("build/classes/resources/SearchClasses.class"));
boolean found = false;
Scanner scanner = new Scanner(is);
while (scanner.hasNext()) {
if (scanner.nextLine().contains("println")) {
System.out.print("println found");
found = true;
break;
}
}
if (!found) {
System.out.print("println NOT found");
}
}
public static void testMethod() {
System.out.println("testing");
}
}
在我的IDE中,我不得不使用FileInputStream访问我正在搜索的类文件.但是如果您正在搜索jar文件,那么可以使用classLoader.您需要机制来搜索所有的类路径…这不是不可能的,但我为了简洁而留下来.
编辑：这是试图让它完全正常工作..搜索类路径中的所有文件为您的方法.
public class SearchClasses {
/**
* @param args the command line arguments
* @throws java.io.FileNotFoundException
*/
public static void main(String[] args) throws FileNotFoundException,IOException {
printAllFileWithMethod("println");
}
public static void printAllFileWithMethod(String methodName) throws FileNotFoundException,IOException {
Enumeration<URL> roots = SearchClasses.class.getClassLoader().getResources("");
List<File> allClassFiles = new ArrayList<>();
while (roots.hasMoreElements()) {
File root = new File(roots.nextElement().getPath());
allClassFiles.addAll(getFilesInDirectoryWithSuffix(root,"class"));
}
for (File classFile : allClassFiles) {
InputStream is = new FileInputStream(classFile);
boolean found = false;
Scanner scanner = new Scanner(is);
while (scanner.hasNext()) {
if (scanner.nextLine().contains(methodName)) {
System.out.print(methodName + " found in " + classFile.getName() + "\n");
found = true;
break;
}
}
}
}
public static void testMethod() {
System.out.println("testing");
}
static List<File> getFilesInDirectoryWithSuffix(File dir,String suffix) {
List<File> foundFiles = new ArrayList<>();
if (!dir.isDirectory()) {
return foundFiles;
}
for (File file : dir.listFiles()) {
if (file.isDirectory()) {
foundFiles.addAll(getFilesInDirectoryWithSuffix(file,suffix));
} else {
String name = file.getName();
if (name.endsWith(suffix)) {
foundFiles.add(file);
}
}
}
return foundFiles;
}
}
