Java内容重新整理删除过期的东西

Java/JavaDemo/codedemo/java/lang/instrument/FirstInstrumentation.java

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+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 <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+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());
+    }
+}

Java/JavaDemo/codedemo/java/lang/instrument/FirstTransformer.java

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+/**
+ * 
+ */
+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 <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+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;
+    }
+
+}

Java/JavaDemo/codedemo/java/lang/instrument/Hello.java

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+package cn.aofeng.demo.java.lang.instrument;
+
+/**
+ * Instrumentation启动类。 * 
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+public class Hello {
+
+    public static void main(String[] args) {
+        // nothing
+    }
+
+}

Java/JavaDemo/codedemo/java/lang/instrument/README.md

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+# 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

Java/JavaDemo/codedemo/java/lang/instrument/build.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project name="Instrumentation" default="run" basedir="../../../../../../../">
+
+	<property name="project.src.dir" value="${basedir}/src" />
+	<property name="project.lib.dir" value="${basedir}/lib" />
+	<property name="project.conf.dir" value="${basedir}/conf" />
+	<property name="project.target.dir" value="${basedir}/classes" />
+	<property name="project.dist.dir" value="${basedir}/dist" />
+
+	<path id="project.classpath">
+		<fileset dir="${project.lib.dir}">
+			<include name="*.jar" />
+		</fileset>
+	</path>
+
+	<target name="prepare">
+		<delete dir="${project.target.dir}" />
+		<mkdir dir="${project.target.dir}"/>
+		<copy todir="${project.target.dir}">
+			<fileset dir="${project.conf.dir}">
+				<include name="**/*.properties" />
+				<include name="**/*.xml" />
+			</fileset>
+		</copy>
+		
+		<delete dir="${project.dist.dir}" />
+		<mkdir dir="${project.dist.dir}" />
+	</target>
+
+	<target name="compileWithJavac" depends="prepare">
+		<echo message="compile with javac" />
+		<javac destdir="${project.target.dir}" srcdir="${project.src.dir}" source="1.8" target="1.8" 
+			encoding="UTF-8" debug="true" includeantruntime="false">
+			<classpath refid="project.classpath" />
+		</javac>
+	</target>
+
+	<target name="package" depends="compileWithJavac">
+	    <jar destfile="${project.dist.dir}/hello.jar">
+	        <fileset dir="${project.target.dir}">
+	            <include name="cn/aofeng/demo/java/lang/instrument/*.class" />
+	        </fileset>
+	    	<manifest>
+	    	    <attribute name="Premain-Class" value="cn.aofeng.demo.java.lang.instrument.FirstInstrumentation" />
+	    	</manifest>
+	    </jar>
+	</target>
+
+	<target name="run" depends="package">
+	    <java classname="cn.aofeng.demo.java.lang.instrument.Hello" fork="true">
+	        <classpath refid="project.classpath" />
+	        <classpath location="${project.target.dir}" />
+	    	<jvmarg value="-javaagent:${project.dist.dir}/hello.jar=&quot;Hello, Instrumentation&quot;" />
+	    </java>
+	</target>
+
+</project>