Java 如何使用Byte Buddy和@Advice捕获返回数据?
我知道方法参数很容易捕获,只需使用@Advice.AllArguments即可。从adviced方法捕获返回数据也很容易吗?我的目标根本不是修改方法,只是“拍下输入和输出的图片”并将其写入文件。返回类型主要是来自javax的响应,但有时是原语Java 如何使用Byte Buddy和@Advice捕获返回数据?,java,javaagents,byte-buddy,Java,Javaagents,Byte Buddy,我知道方法参数很容易捕获,只需使用@Advice.AllArguments即可。从adviced方法捕获返回数据也很容易吗?我的目标根本不是修改方法,只是“拍下输入和输出的图片”并将其写入文件。返回类型主要是来自javax的响应,但有时是原语 public class MyAdviser { @Advice.OnMethodEnter public static void onEnter(@Advice.This Object obj, @Advice.Origin String me
public class MyAdviser {
@Advice.OnMethodEnter
public static void onEnter(@Advice.This Object obj, @Advice.Origin String method,
@Advice.AllArguments Object[] args) throws IOException {
FileWriter fw = new FileWriter("AgentData.txt", true);
BufferedWriter bw = new BufferedWriter(fw);
PrintWriter out = new PrintWriter(bw);
out.println(method);
out.println("Arguments : " + Arrays.deepToString(args));
out.println("---------------------------------------------");
out.close();
final Logger LOG = LoggerFactory.getLogger(obj.getClass());
LOG.info("Method name : " + method + " Object : " + obj + " " + obj.getClass());
LOG.info("Arguments : " + Arrays.deepToString(args));
}
@Advice.OnMethodExit
public static void onExit(@Advice.Origin String method) {
}
}
正如
Advice
类的javadoc中提到的:
@Advice.OnMethodExit
public static void onExit(@Advice.Origin String method,
@Advice.Return Object returned,
@Advice.Thrown Throwable thrown) {
// thrown will be null if no exception was thrown, returned if it was
}