Java 平台调试体系原理和实践

/**  *   测试程序 * @author zhangyu * @date 2022/2/17*/@SpringBootApplication@RestControllerpublic class DebuggerApplication {
    public static void main(String[] args) {        SpringApplication.run(DebuggerApplication.class, args);    }
    @GetMapping("/test")    public  String test(){        System.out.println(111);        System.out.println(222);        return "OK";    }
}

java -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8888 -jar debugger-0.0.1-SNAPSHOT.jar

CATALINA_OPTS='-server -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=18006'

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;
@SpringBootApplication@RestControllerpublic class DebuggerApplication {
    public static void main(String[] args) {        SpringApplication.run(DebuggerApplication.class, args);    }
    @GetMapping("/test")    public  String test(String name){        System.out.println("进入方法");        int var=100;        System.out.println(name);        System.out.println(var);        System.out.println("方法结束");        return "OK";    }}

import com.sun.jdi.*;import com.sun.jdi.connect.AttachingConnector;import com.sun.jdi.connect.Connector;import com.sun.jdi.event.*;import com.sun.jdi.request.BreakpointRequest;import com.sun.jdi.request.EventRequest;import com.sun.jdi.request.EventRequestManager;import com.sun.tools.jdi.SocketAttachingConnector;
import java.util.List;import java.util.Map;
/** *  通过JNI工具测试Debug * @author zhangyu * @date 2022/2/20*/public class TestDebugVirtualMachine {

    private static VirtualMachine vm;
    public static void main(String[] args) throws Exception {        //获取SocketAttachingConnector,连接其它JVM称之为附加(attach)操作        VirtualMachineManager vmm = Bootstrap.virtualMachineManager();        List<AttachingConnector> connectors = vmm.attachingConnectors();        SocketAttachingConnector sac = null;        for(AttachingConnector ac : connectors) {            if(ac instanceof SocketAttachingConnector) {                sac = (SocketAttachingConnector) ac;            }        }        assert sac != null;        //设置好主机地址，端口信息        Map<String, Connector.Argument> arguments = sac.defaultArguments();        Connector.Argument hostArg = arguments.get("hostname");        Connector.Argument portArg = arguments.get("port");        hostArg.setValue("127.0.0.1");        portArg.setValue(String.valueOf(8800));        //进行连接         vm = sac.attach(arguments);        //相应的请求调用通过requestManager来完成        EventRequestManager eventRequestManager = vm.eventRequestManager();        //创建一个代码判断，因此需要获取相应的类，以及具体的断点位置，即相应的代码行。        ClassType clazz = (ClassType) vm.classesByName("com.zy.debugger.DebuggerApplication").get(0);        //设置断点代码位置        Location location = clazz.locationsOfLine(22).get(0);        //创建新断点并设置阻塞模式为线程阻塞，即只有当前线程被阻塞        BreakpointRequest breakpointRequest = eventRequestManager.createBreakpointRequest(location);        //设置阻塞并启动        breakpointRequest.setSuspendPolicy(EventRequest.SUSPEND_EVENT_THREAD);        breakpointRequest.enable();        //获取vm的事件队列        EventQueue eventQueue = vm.eventQueue();        while(true) {            //不断地读取事件并处理断点记录事件            EventSet eventSet = eventQueue.remove();            EventIterator eventIterator = eventSet.eventIterator();            while(eventIterator.hasNext()) {                Event event = eventIterator.next();                execute(event);            }            //将相应线程resume，表示继续运行            eventSet.resume();        }    }
    /**     *  处理监听到事件     * @author zhangyu     * @date 2022/2/20    */    public static void execute(Event event) throws Exception {        //获取的event为一个抽象的事件记录，可以通过类型判断转型为具体的事件，这里我们转型为BreakpointEvent，即断点记录，        BreakpointEvent breakpointEvent = (BreakpointEvent) event;        //并通过断点处的线程拿到线程帧，进而获取相应的变量信息，并打印记录。        ThreadReference threadReference = breakpointEvent.thread();        StackFrame stackFrame = threadReference.frame(0);        List<LocalVariable> localVariables = stackFrame.visibleVariables();        //输出当前线程栈帧保存的变量数据        localVariables.forEach(t -> {            Value value = stackFrame.getValue(t);            System.out.println("local->" + value.type() + "," + value.getClass() + "," + value);        });    }
}