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王永华
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‎README.md‎

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# javaAgent

‎agentlib/pom.xml‎

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</repository>
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</repositories>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.11</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.javassist</groupId>
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<artifactId>javassist</artifactId>
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<version>3.18.2-GA</version>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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<version>1.7.7</version>
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</dependency>
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-core</artifactId>
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<version>1.1.7</version>
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</dependency>
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-access</artifactId>
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<version>1.1.7</version>
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</dependency>
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-classic</artifactId>
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<version>1.1.7</version>
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</dependency>
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</dependencies>
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<build>
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<finalName>agent</finalName>
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<plugins>

‎agentlib/src/main/java/org/greenleaf/ApmAgent.java‎

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import javassist.CtConstructor;
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import javassist.CtMethod;
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import javassist.LoaderClassPath;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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public class ApmAgent implements ClassFileTransformer {
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private static Logger logger = LoggerFactory.getLogger(ApmAgent.class);
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@Override
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public byte[] transform(ClassLoader loader, String className,
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Class<?> classBeingRedefined, ProtectionDomain protectionDomain,
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CtClass cls = pool.makeClass(new ByteArrayInputStream(classfileBuffer));
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CtConstructor[] ccs = cls.getDeclaredConstructors();
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for (CtConstructor cc : ccs) {
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//构造函数方法体开始时添加的代码
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String codeStrBefore = "System.out.println(\"This code is inserted before constructor "+className+"\");";
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//构造函数方法体结束前添加的代码
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String codeStrAfter = "System.out.println(\"This code is inserted after constructor "+className+"\");";
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cc.insertBeforeBody((codeStrBefore));
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cc.insertAfter(codeStrAfter, true);
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}
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long startTime = System.currentTimeMillis();
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System.out.println("time cost " + (System.currentTimeMillis() - startTime));
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CtMethod[] methods = cls.getDeclaredMethods();
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for (CtMethod method : methods) {
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String codeStrBefore = "System.out.println(\"This code is inserted before method "+method.getName()+"\");";
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String codeStrAfter = "System.out.println(\"This code is inserted after method "+method.getName()+"\");";
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String codeStrBefore = "long startTime = System.currentTimeMillis();";
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String codeStrAfter = "System.out.println(\"time cost \" + (System.currentTimeMillis() - startTime));";
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System.out.println(codeStrBefore);
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System.out.println(codeStrAfter);
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method.insertBefore(codeStrBefore);
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method.insertAfter(codeStrAfter, true);
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}
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File file = new File(cls.getSimpleName() + ".class");
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System.out.println(file.getAbsolutePath());
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try(FileOutputStream fileOutputStream = new FileOutputStream(file)) {
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fileOutputStream.write(cls.toBytecode());
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} catch (Exception e) {
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e.printStackTrace();
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}
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return cls.toBytecode();
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} catch (IOException e) {
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e.printStackTrace();
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} catch (RuntimeException e) {
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e.printStackTrace();
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} catch (CannotCompileException e) {
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e.printStackTrace();
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} catch (Exception e) {
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logger.error("", e);
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}
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return null;
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}
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public static void premain(String agentArgs, Instrumentation inst) {
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System.out.println("====premain exe args=" + agentArgs);
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logger.info("premain exe args : {}" + agentArgs);
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inst.addTransformer(new ApmAgent());
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}
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}

‎agentlib/src/main/resource/logback.xml‎

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<!-- 级别从高到低 OFF 、 FATAL 、 ERROR 、 WARN 、 INFO 、 DEBUG 、 TRACE 、 ALL -->
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<!-- 日志输出规则 根据当前ROOT 级别，日志输出时，级别高于root默认的级别时 会输出 -->
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<!-- 以下 每个配置的 filter 是过滤掉输出文件里面，会出现高级别文件，依然出现低级别的日志信息，通过filter 过滤只记录本级别的日志 -->
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<!-- scan 当此属性设置为true时，配置文件如果发生改变，将会被重新加载，默认值为true。 -->
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<!-- scanPeriod 设置监测配置文件是否有修改的时间间隔，如果没有给出时间单位，默认单位是毫秒。当scan为true时，此属性生效。默认的时间间隔为1分钟。 -->
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<!-- debug 当此属性设置为true时，将打印出logback内部日志信息，实时查看logback运行状态。默认值为false。 -->
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<configuration scan="true" scanPeriod="60 seconds" debug="false">
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<!-- 动态日志级别 -->
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<jmxConfigurator />
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<!-- 定义日志文件 输出位置 -->
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<!-- <property name="log_dir" value="C:/test" />-->
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<property name="log_dir" value="./logs/" />
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<!-- 日志最大的历史 30天 -->
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<property name="maxHistory" value="30" />
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<!-- ConsoleAppender 控制台输出日志 -->
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<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
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<encoder>
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</encoder>
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</appender>
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<!-- ERROR级别日志 -->
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<!-- 滚动记录文件，先将日志记录到指定文件，当符合某个条件时，将日志记录到其他文件 RollingFileAppender -->
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<appender name="ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
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<!-- 过滤器，只记录WARN级别的日志 -->
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<!-- 果日志级别等于配置级别，过滤器会根据onMath 和 onMismatch接收或拒绝日志。 -->
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<filter class="ch.qos.logback.classic.filter.LevelFilter">
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<!-- 设置过滤级别 -->
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<level>ERROR</level>
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<!-- 用于配置符合过滤条件的操作 -->
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<onMatch>ACCEPT</onMatch>
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<!-- 用于配置不符合过滤条件的操作 -->
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<onMismatch>DENY</onMismatch>
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</filter>
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<!-- 最常用的滚动策略，它根据时间来制定滚动策略.既负责滚动也负责出发滚动 -->
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<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
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<!--日志输出位置 可相对、和绝对路径 -->
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<fileNamePattern>
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${log_dir}/error/%d{yyyy-MM-dd}/error-log.log
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</fileNamePattern>
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<!-- 可选节点，控制保留的归档文件的最大数量，超出数量就删除旧文件假设设置每个月滚动，且<maxHistory>是6， 则只保存最近6个月的文件，删除之前的旧文件。注意，删除旧文件是，那些为了归档而创建的目录也会被删除 -->
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<maxHistory>${maxHistory}</maxHistory>
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</rollingPolicy>
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<encoder>
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<pattern>
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<!-- 设置日志输出格式 -->
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%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger - %msg%n
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</pattern>
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</encoder>
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</appender>
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<!-- WARN级别日志 appender -->
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<appender name="WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
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<!-- 过滤器，只记录WARN级别的日志 -->
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<!-- 果日志级别等于配置级别，过滤器会根据onMath 和 onMismatch接收或拒绝日志。 -->
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<filter class="ch.qos.logback.classic.filter.LevelFilter">
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<!-- 设置过滤级别 -->
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<level>WARN</level>
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<!-- 用于配置符合过滤条件的操作 -->
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<onMatch>ACCEPT</onMatch>
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<!-- 用于配置不符合过滤条件的操作 -->
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<onMismatch>DENY</onMismatch>
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</filter>
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<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
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<!--日志输出位置 可相对、和绝对路径 -->
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<fileNamePattern>${log_dir}/warn/%d{yyyy-MM-dd}/warn-log.log</fileNamePattern>
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<maxHistory>${maxHistory}</maxHistory>
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</rollingPolicy>
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<encoder>
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<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger - %msg%n</pattern>
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</encoder>
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</appender>
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<!-- INFO级别日志 appender -->
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<appender name="INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
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<filter class="ch.qos.logback.classic.filter.LevelFilter">
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<level>INFO</level>
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<onMatch>ACCEPT</onMatch>
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<onMismatch>DENY</onMismatch>
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</filter>
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<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
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<fileNamePattern>${log_dir}/info/%d{yyyy-MM-dd}/info-log.log</fileNamePattern>
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<maxHistory>${maxHistory}</maxHistory>
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</rollingPolicy>
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<encoder>
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<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger - %msg%n</pattern>
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</encoder>
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</appender>
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<!-- DEBUG级别日志 appender -->
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<appender name="DEBUG" class="ch.qos.logback.core.rolling.RollingFileAppender">
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<filter class="ch.qos.logback.classic.filter.LevelFilter">
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<level>DEBUG</level>
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<onMatch>ACCEPT</onMatch>
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<onMismatch>DENY</onMismatch>
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</filter>
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<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
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<fileNamePattern>${log_dir}/debug/%d{yyyy-MM-dd}/debug-log.log</fileNamePattern>
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<maxHistory>${maxHistory}</maxHistory>
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</rollingPolicy>
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<encoder>
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<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger - %msg%n</pattern>
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</encoder>
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</appender>
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<!-- TRACE级别日志 appender -->
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<appender name="TRACE" class="ch.qos.logback.core.rolling.RollingFileAppender">
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<filter class="ch.qos.logback.classic.filter.LevelFilter">
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<level>TRACE</level>
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<onMatch>ACCEPT</onMatch>
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<onMismatch>DENY</onMismatch>
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</filter>
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<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
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<fileNamePattern>${log_dir}/trace/%d{yyyy-MM-dd}/trace-log.log</fileNamePattern>
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<maxHistory>${maxHistory}</maxHistory>
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</rollingPolicy>
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<encoder>
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<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger - %msg%n</pattern>
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</encoder>
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</appender>
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<!-- root级别 DEBUG -->
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<root>
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<!-- 打印debug级别日志及以上级别日志 -->
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<level value="debug" />
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<!-- 控制台输出 -->
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<appender-ref ref="console" />
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<!-- 文件输出 -->
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<appender-ref ref="ERROR" />
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<appender-ref ref="INFO" />
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<appender-ref ref="WARN" />
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<appender-ref ref="DEBUG" />
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<appender-ref ref="TRACE" />
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</root>
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</configuration>

‎pom.xml‎

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<artifactId>javassist</artifactId>
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<version>3.18.2-GA</version>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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<version>1.7.7</version>
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</dependency>
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-core</artifactId>
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<version>1.1.7</version>
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</dependency>
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<dependency>
48+
<groupId>ch.qos.logback</groupId>
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<artifactId>logback-access</artifactId>
50+
<version>1.1.7</version>
51+
</dependency>
52+
<dependency>
53+
<groupId>ch.qos.logback</groupId>
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<artifactId>logback-classic</artifactId>
55+
<version>1.1.7</version>
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</dependency>
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</dependencies>
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<build>

‎sample/App.class‎

-1.27 KB
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‎sample/TransClass.class‎

-1.16 KB
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‎sample/src/main/java/org/greenleaf/sample/App.java‎

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package org.greenleaf.sample;
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import org.greenleaf.sample.bean.TransClass;
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import org.greenleaf.sample.bean.BusManager;
4+
import org.slf4j.Logger;
5+
import org.slf4j.LoggerFactory;
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/**
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* Hello world!
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*/
810
public class App {
911

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private static Logger logger = LoggerFactory.getLogger(App.class);
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1014
public static void main(String[] args) {
11-
System.out.println("Hello World1!");
12-
int um = new TransClass().getNumber();
13-
System.out.println("return value is " + um);
15+
logger.info("Hello World");
16+
logger.info("return value is {} ", new BusManager().getNumber());
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}
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}

‎sample/src/main/java/org/greenleaf/sample/bean/BusManager.java‎

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package org.greenleaf.sample.bean;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class BusManager {
7+
8+
private static Logger logger = LoggerFactory.getLogger(BusManager.class);
9+
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public int getNumber() {
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return 2;
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}
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public int comparre() {
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return super.hashCode();
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}
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}

‎sample/src/main/java/org/greenleaf/sample/bean/TransClass.java‎

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