BTrace拦截输入参数及返回值

服务端类：

package test;

public class BTraceServer {

	public String sayHello(int i) {
		return "参数" + i;
	}

	public static void main(String[] args) throws InterruptedException {
		BTraceServer bt = new BTraceServer();
		int i = 0;
		while (true) {
			System.err.println(bt.sayHello(i++));
			Thread.sleep(1000);
		}
	}

}

客户端类：

package test;

import com.sun.btrace.BTraceUtils;
import com.sun.btrace.annotations.BTrace;
import com.sun.btrace.annotations.Kind;
import com.sun.btrace.annotations.Location;
import com.sun.btrace.annotations.OnMethod;
import com.sun.btrace.annotations.Return;
import com.sun.btrace.annotations.Self;

@BTrace
public class BTraceTest {
	@OnMethod(clazz="test.BTraceServer", method="sayHello",
		     location=@Location(Kind.RETURN))
	public static void onSayHello(@Self BTraceServer s, int param, @Return String ret){
		BTraceUtils.print(param);
		BTraceUtils.println(ret);
	}
			
}

1、将服务端类打成jar包；
2、btrace执行btrace -classpath D:\doc\btrace\btrace-bin\build\test.jar 【PID】 BTraceTest.java
3、btrace  -cp "SNAPSHOT.jar:1.7.8.jar" 32201 Test.java
4、btrace  -cp d:\path\classes 32201 Test.java