diff --git a/README.md b/README.md index ca2a662..cbbe5f5 100644 --- a/README.md +++ b/README.md @@ -3,6 +3,8 @@ 在这里，通过文章和代码，把这些知识点和技术的主要内容记录并汇总，供自己快速回顾，也分享给他人。 +注：部分例子基于JDK8。 + ## 关键字 * [transient与序列化](src/cn/aofeng/demo/java/lang/serialization/TransientDemo.java) @@ -76,6 +78,7 @@ ## 线程＆并发 +* [守护线程](src/cn/aofeng/demo/thread/DaemonThreadDemo.java) * [fork/join](src/cn/aofeng/demo/java/util/forkjoin/HelloForkJoin.java) * [Future](src/cn/aofeng/demo/java/util/future/HelloFuture.java) * [Future接口关系图](src/cn/aofeng/demo/java/util/future/Future.ucls) @@ -93,6 +96,7 @@ ## AOP * [AspectJ-编译时织入和加载类时织入](src/cn/aofeng/demo/aspectj) +* [Instrumentation入门](src/cn/aofeng/demo/java/lang/instrument) ## 脚本语言 * [在Java中执行JavaScript脚本](src/cn/aofeng/demo/script/ScriptRunPerformence.java) @@ -106,6 +110,10 @@ * [HMAC-SHA1签名算法](src/cn/aofeng/demo/encrypt/HmacSha1.java) ## 开源组件 + +### Slf4j +* [slf4j使用示例](src/cn/aofeng/demo/slf4j/HelloSlf4j.java) + ### Redis * [Redis客户端Jedis使用示例](src/cn/aofeng/demo/redis/JedisDemo.java) diff --git a/src/cn/aofeng/demo/java/lang/instrument/FirstInstrumentation.java b/src/cn/aofeng/demo/java/lang/instrument/FirstInstrumentation.java new file mode 100644 index 0000000..d4319ca --- /dev/null +++ b/src/cn/aofeng/demo/java/lang/instrument/FirstInstrumentation.java @@ -0,0 +1,25 @@ +package cn.aofeng.demo.java.lang.instrument; + +import java.lang.instrument.Instrumentation; + +import org.apache.commons.lang.StringUtils; + +import cn.aofeng.demo.util.LogUtil; + +/** + * Instrument入口类。 + * + * @author 聂勇 + */ +public class FirstInstrumentation { + + public static void premain(String options, Instrumentation ins) { + if (StringUtils.isBlank(options)) { + LogUtil.log("instrument without options"); + } else { + LogUtil.log("instrument with options:%s", options); + } + + ins.addTransformer(new FirstTransformer()); + } +} diff --git a/src/cn/aofeng/demo/java/lang/instrument/FirstTransformer.java b/src/cn/aofeng/demo/java/lang/instrument/FirstTransformer.java new file mode 100644 index 0000000..48ce691 --- /dev/null +++ b/src/cn/aofeng/demo/java/lang/instrument/FirstTransformer.java @@ -0,0 +1,26 @@ +/** + * + */ +package cn.aofeng.demo.java.lang.instrument; + +import java.lang.instrument.ClassFileTransformer; +import java.lang.instrument.IllegalClassFormatException; +import java.security.ProtectionDomain; + +import cn.aofeng.demo.util.LogUtil; + +/** + * 只输出问候语，不进行字节码修改的Class转换器。 + * + * @author 聂勇 + */ +public class FirstTransformer implements ClassFileTransformer { + + @Override + public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined, + ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException { + LogUtil.log(">>> %s", className); + return null; + } + +} diff --git a/src/cn/aofeng/demo/java/lang/instrument/Hello.java b/src/cn/aofeng/demo/java/lang/instrument/Hello.java new file mode 100644 index 0000000..01fd76f --- /dev/null +++ b/src/cn/aofeng/demo/java/lang/instrument/Hello.java @@ -0,0 +1,14 @@ +package cn.aofeng.demo.java.lang.instrument; + +/** + * Instrumentation启动类。 * + * + * @author 聂勇 + */ +public class Hello { + + public static void main(String[] args) { + // nothing + } + +} diff --git a/src/cn/aofeng/demo/java/lang/instrument/README.md b/src/cn/aofeng/demo/java/lang/instrument/README.md new file mode 100644 index 0000000..53fe4e5 --- /dev/null +++ b/src/cn/aofeng/demo/java/lang/instrument/README.md @@ -0,0 +1,40 @@ +# 一、Instrumentation入门 + +* [FirstTransformer.java](FirstTransformer.java) 处理字节码，由类FirstInstrumentation执行 +* [FirstInstrumentation.java](FirstInstrumentation.java) instrumentation入口类，由javaagent载入执行 +* [build.xml](build.xml) Ant脚本，负责编译、打包和运行 + +在当前目录下执行命令： +```bash +ant +``` + +输出信息如下： +> [java] instrument with options:"Hello, Instrumentation" +> [java] >>> java/lang/invoke/MethodHandleImpl +> [java] >>> java/lang/invoke/MethodHandleImpl$1 +> [java] >>> java/lang/invoke/MethodHandleImpl$2 +> [java] >>> java/util/function/Function +> [java] >>> java/lang/invoke/MethodHandleImpl$3 +> [java] >>> java/lang/invoke/MethodHandleImpl$4 +> [java] >>> java/lang/ClassValue +> [java] >>> java/lang/ClassValue$Entry +> [java] >>> java/lang/ClassValue$Identity +> [java] >>> java/lang/ClassValue$Version +> [java] >>> java/lang/invoke/MemberName$Factory +> [java] >>> java/lang/invoke/MethodHandleStatics +> [java] >>> java/lang/invoke/MethodHandleStatics$1 +> [java] >>> sun/misc/PostVMInitHook +> [java] >>> sun/usagetracker/UsageTrackerClient +> [java] >>> java/util/concurrent/atomic/AtomicBoolean +> [java] >>> sun/usagetracker/UsageTrackerClient$1 +> [java] >>> sun/usagetracker/UsageTrackerClient$4 +> [java] >>> sun/usagetracker/UsageTrackerClient$3 +> [java] >>> java/io/FileOutputStream$1 +> [java] >>> sun/launcher/LauncherHelper +> [java] >>> cn/aofeng/demo/java/lang/instrument/Hello +> [java] >>> sun/launcher/LauncherHelper$FXHelper +> [java] >>> java/lang/Class$MethodArray +> [java] >>> java/lang/Void +> [java] >>> java/lang/Shutdown +> [java] >>> java/lang/Shutdown$Lock diff --git a/src/cn/aofeng/demo/java/lang/instrument/build.xml b/src/cn/aofeng/demo/java/lang/instrument/build.xml new file mode 100644 index 0000000..2abfbb1 --- /dev/null +++ b/src/cn/aofeng/demo/java/lang/instrument/build.xml @@ -0,0 +1,57 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/src/cn/aofeng/demo/mybatis/README.md b/src/cn/aofeng/demo/mybatis/README.md new file mode 100644 index 0000000..e214deb --- /dev/null +++ b/src/cn/aofeng/demo/mybatis/README.md @@ -0,0 +1,5 @@ +* [MyBatisClien.java](MyBatisClient.java) 入口类。读取配置文件，生成SqlSessionFactory，使用DAO操作表。 +* [mybatis-config.xml](../../../../../conf/mybatis-config.xml) mybatis配置文件 +* [MonitNotifyHistoryDao](dao/MonitNotifyHistoryDao.java) DAO类 +* [MonitNotifyHisto.java](entity/MonitNotifyHistory.java) 实体类 +* [MonitNotifyHistoryMapper.xml](mapper/MonitNotifyHistoryMapper.xml) SQL模板映射配置文件 diff --git a/src/cn/aofeng/demo/slf4j/HelloSlf4j.java b/src/cn/aofeng/demo/slf4j/HelloSlf4j.java new file mode 100644 index 0000000..dce7ffd --- /dev/null +++ b/src/cn/aofeng/demo/slf4j/HelloSlf4j.java @@ -0,0 +1,31 @@ +package cn.aofeng.demo.slf4j; + +import java.io.IOException; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * slf4j使用示例。 + * + * @author 聂勇 + */ +public class HelloSlf4j { + + private static Logger _logger = LoggerFactory.getLogger(HelloSlf4j.class); + + public static void main(String[] args) { + // 直接输出字符串 + _logger.info("Hello, slf4j logger."); + + // 输出格式字符串（携带多个填充参数） + _logger.info("{} + {} = {}", 1, 2, (1+2)); + + // 输出错误信息和异常堆栈 + _logger.error("错误信息", new IOException("测试抛出IO异常信息")); + + // 输出错误信息（携带多个填充参数）和异常堆栈 + _logger.error("两个参数。agrs1:{};agrs2:{}的info级别日志", "args1", "args2", new IOException("测试抛出IO异常信息")); + } + +} diff --git a/src/cn/aofeng/demo/thread/DaemonThreadDemo.java b/src/cn/aofeng/demo/thread/DaemonThreadDemo.java new file mode 100644 index 0000000..541d133 --- /dev/null +++ b/src/cn/aofeng/demo/thread/DaemonThreadDemo.java @@ -0,0 +1,45 @@ +/** + * 公司：阿里游戏 + * 创建时间：2018年11月2日下午5:56:43 + */ +package cn.aofeng.demo.thread; + +import java.util.Date; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * 守护线程DEMO。 + * + * @author 聂勇 + */ +public class DaemonThreadDemo extends Thread { + + private static Logger logger = LoggerFactory.getLogger(DaemonThreadDemo.class); + + @Override + public void run() { + while (true) { + System.out.println("守护线程运行, 时间:" + new Date()); + try { + Thread.sleep(1000); + } catch (InterruptedException e) { + logger.error("守护线程运行出错", e); + } + } + } + + public static void main(String[] args) { + DaemonThreadDemo thread = new DaemonThreadDemo(); + thread.setDaemon(true); + thread.start(); + + try { + Thread.sleep(5000); + } catch (InterruptedException e) { + logger.error("主线程运行出错", e); + } + } + +} diff --git a/src/cn/aofeng/demo/util/LogUtil.java b/src/cn/aofeng/demo/util/LogUtil.java index 6046793..44558c9 100644 --- a/src/cn/aofeng/demo/util/LogUtil.java +++ b/src/cn/aofeng/demo/util/LogUtil.java @@ -7,8 +7,12 @@ */ public class LogUtil { + public static void log(String msg) { + System.out.println(msg); + } + public static void log(String msg, Object... param) { - System.out.println( String.format(msg, param) ); + log( String.format(msg, param) ); } }