Demo位置：  

配置

1、在【project】的build.gradle中配置：

buildscript {    repositories {        google()        jcenter()        mavenCentral()//【aspectj】需要依赖maven仓库    }    dependencies {        classpath 'com.android.tools.build:gradle:3.1.2'        classpath 'org.aspectj:aspectjtools:1.8.9'//【aspectj】编写gradle编译脚本        classpath 'org.aspectj:aspectjweaver:1.8.9'//【aspectj】编写gradle编译脚本    }}

 

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buildscript {

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   repositories {

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       google()

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       jcenter()

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       mavenCentral()//【aspectj】需要依赖maven仓库

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   }

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   dependencies {

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       classpath 'com.android.tools.build:gradle:3.1.2'

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       classpath 'org.aspectj:aspectjtools:1.8.9'//【aspectj】编写gradle编译脚本

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       classpath 'org.aspectj:aspectjweaver:1.8.9'//【aspectj】编写gradle编译脚本

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   }

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}

2、在【project】的build.gradle最后面添加脚本：

注意，直接粘贴到build.gradle文件的末尾即可，不要嵌套在别的指令中

//AOP需要执行的脚本，每一个application和library都需要import org.aspectj.bridge.MessageHandlerimport org.aspectj.tools.ajc.Maindef aop(variants) {    variants.all { variant ->        JavaCompile javaCompile = variant.javaCompile        String[] args;        javaCompile.doFirst {            args = ["-showWeaveInfo",                    "-1.8",                    "-inpath", javaCompile.destinationDir.toString(),                    "-aspectpath", javaCompile.classpath.asPath,                    "-d", javaCompile.destinationDir.toString(),                    "-classpath", path,                    "-bootclasspath", project.android.bootClasspath.join(File.pathSeparator)]        }        javaCompile.doLast {            new Main().run(args, new MessageHandler(false));        }    }}

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//AOP需要执行的脚本，每一个application和library都需要

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import org.aspectj.bridge.MessageHandler

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import org.aspectj.tools.ajc.Main

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def aop(variants) {

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   variants.all { variant ->

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       JavaCompile javaCompile = variant.javaCompile

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       String[] args;

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       javaCompile.doFirst {

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           args = ["-showWeaveInfo",

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                   "-1.8",

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                   "-inpath", javaCompile.destinationDir.toString(),

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                   "-aspectpath", javaCompile.classpath.asPath,

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                   "-d", javaCompile.destinationDir.toString(),

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                   "-classpath", path,

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                   "-bootclasspath", project.android.bootClasspath.join(File.pathSeparator)]

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       }

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       javaCompile.doLast {

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           new Main().run(args, new MessageHandler(false));

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       }

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   }

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}

3、在【module】的build.gradle中添加依赖：

注意，每一个application和library都需要添加

implementation 'org.aspectj:aspectjrt:1.8.9'//每一个application和library都需要

 

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implementation 'org.aspectj:aspectjrt:1.8.9'//每一个application和library都需要

4、在【module】的build.gradle中添加编译脚本：

注意，直接粘贴到build.gradle文件的末尾即可，不要嵌套在别的指令中

rootProject.aop(project.android.applicationVariants)//如果是【application】或rootProject.aop(project.android.libraryVariants)//如果是【library】

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rootProject.aop(project.android.applicationVariants)//如果是【application】

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或

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rootProject.aop(project.android.libraryVariants)//如果是【library】

定义拦截点击事件的 Aspect

OnClickAspect

/** * 拦截所有View或其子类的【onClick方法】以及通过ButterKnife的注解添加的点击事件 */@Aspectpublic class OnClickAspect {	@Pointcut("execution(* android.view.View.On*Listener.on*Click(..)) ")//定义匹配范围：执行指定方法时拦截	public void onClick() {//匹配View.OnClickListener中的onClick方法和View.OnLongClickListener中的OnLongClickListener方法	}		@Pointcut("execution(* *.on*ItemClick(..)) ")//如果有多个匹配范围，可以定义多个，多个规则之间通过 || 或 && 控制	public void onItemClick() {//匹配任意名字以on开头以ItemClick结尾的方法	}		@Pointcut("execution(@butterknife.OnClick * *(..))")//匹配通过butterknife的OnClick注解添加的点击事件	public void butterKnifeOnClick() {	}		@Around("onClick() || onItemClick() || butterKnifeOnClick()")//@Around 拦截方法，这个注解可以同时拦截方法的执行前后	public Object around(ProceedingJoinPoint joinPoint) throws Throwable {		long beginTime = SystemClock.currentThreadTimeMillis();		printJoinPointInfo(joinPoint);				if (joinPoint.getSignature() instanceof MethodSignature) {			MethodSignature signature = (MethodSignature) joinPoint.getSignature();//要根据Pointcut匹配的类型强转			printMethodSignatureInfo(signature);			printArgs(joinPoint);			printParameterInfo(joinPoint);		}				Object result = joinPoint.proceed();		Log.i("bqt", "【@Around】返回值=" + ObjToStringUtils.toString(result)// null				+ "  方法执行耗时=" + (SystemClock.currentThreadTimeMillis() - beginTime));//2		return result;	}		//必须是静态方法	private static void printJoinPointInfo(ProceedingJoinPoint joinPoint) {		Log.i("bqt", "【@Around】MethodSignature"				+ "\nKind=" + joinPoint.getKind()//method-execution				+ "\nArgs=" + ObjToStringUtils.toString(joinPoint.getArgs())//[android.widget.TextView{d090a1d V.ED..C.. ...P.... 0,0-1440,210}]				+ "\nSignature=" + ObjToStringUtils.toString(joinPoint.getSignature())//void com.bqt.aop.MainActivity.1.onClick(View)				+ "\nSourceLocation=" + ObjToStringUtils.toString(joinPoint.getSourceLocation())//MainActivity.java:25				+ "\nStaticPart=" + ObjToStringUtils.toString(joinPoint.getStaticPart())//execution(void com.bqt.aop.MainActivity.1.onClick(View))				+ "\nTarget=" + ObjToStringUtils.toString(joinPoint.getTarget())//com.bqt.aop.MainActivity$1@d5c5492				+ "\nThis=" + ObjToStringUtils.toString(joinPoint.getThis()));//com.bqt.aop.MainActivity$1@d5c5492	}		private static void printMethodSignatureInfo(MethodSignature signature) {		//下面通过MethodSignature的方式获取方法的详细信息，也基本都可以通过Method对象获取		Log.i("bqt", "【@Around】MethodSignature"				+ "\n方法=" + ObjToStringUtils.toString(signature.getMethod())// public void com.bqt.aop.MainActivity$1.onClick(android.view.View)				+ "\n方法名=" + signature.getName()// onClick				+ "\n返回值类型=" + ObjToStringUtils.toString(signature.getReturnType())// void				+ "\n声明类型=" + ObjToStringUtils.toString(signature.getDeclaringType())// class com.bqt.aop.MainActivity$1				+ "\n声明类型名=" + signature.getDeclaringTypeName()// com.bqt.aop.MainActivity$1				+ "\n异常类型=" + ObjToStringUtils.toString(signature.getExceptionTypes())// []				+ "\n修饰符=" + signature.getModifiers()// 1，对应为 public static final int PUBLIC  = 0x00000001				+ "\n参数名=" + ObjToStringUtils.toString(signature.getParameterNames())// ["v"]				+ "\n参数类型=" + ObjToStringUtils.toString(signature.getParameterTypes()));// [class android.view.View]	}		private static void printArgs(ProceedingJoinPoint joinPoint) {		String[] parameterNames = ((MethodSignature) joinPoint.getSignature()).getParameterNames();//获取参数名列表		Object[] parameterValues = joinPoint.getArgs();//获取参数值列表				StringBuilder builder = new StringBuilder("");		for (int i = 0; i < parameterValues.length; i++) {			builder.append("\n")					.append(parameterNames[i])					.append("=")//拼接参数名					.append(ObjToStringUtils.toString(parameterValues[i]));//拼接参数值		}		Log.i("bqt", "【@Around】参数列表" + builder.toString());//v=android.widget.TextView{d090a1d V.ED..C.. ...P.... 0,0-1440,210}	}		private static void printParameterInfo(ProceedingJoinPoint joinPoint) {		Object[] parameterValues = joinPoint.getArgs();//获取参数值列表		for (Object obj : parameterValues) {			if (obj instanceof TextView) {				TextView textView = (TextView) obj;				Log.i("bqt", "【@Around】TextView的信息"						+ "  文字=" + textView.getText()						+ "  所属界面=" + textView.getContext().getClass().getSimpleName()						+ "  ID=" + textView.getId()						+ "  父页面名称=" + textView.getParent().getClass().getSimpleName()				);			}		}	}}

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/**

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* 拦截所有View或其子类的【onClick方法】以及通过ButterKnife的注解添加的点击事件

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*/

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@Aspect

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public class OnClickAspect {

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@Pointcut("execution(* android.view.View.On*Listener.on*Click(..)) ")//定义匹配范围：执行指定方法时拦截

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public void onClick() {
            //匹配View.OnClickListener中的onClick方法和View.OnLongClickListener中的OnLongClickListener方法

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}

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@Pointcut("execution(* *.on*ItemClick(..)) ")//如果有多个匹配范围，可以定义多个，多个规则之间通过 || 或 && 控制

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public void onItemClick() {
            //匹配任意名字以on开头以ItemClick结尾的方法

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}

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@Pointcut("execution(@butterknife.OnClick * *(..))")//匹配通过butterknife的OnClick注解添加的点击事件

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public void butterKnifeOnClick() {

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}

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@Around("onClick() || onItemClick() || butterKnifeOnClick()")//@Around 拦截方法，这个注解可以同时拦截方法的执行前后

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public Object around(ProceedingJoinPoint joinPoint) throws Throwable {

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long beginTime = SystemClock.currentThreadTimeMillis();

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printJoinPointInfo(joinPoint);

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if (joinPoint.getSignature() instanceof MethodSignature) {

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MethodSignature signature = (MethodSignature) joinPoint.getSignature();//要根据Pointcut匹配的类型强转

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printMethodSignatureInfo(signature);

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printArgs(joinPoint);

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printParameterInfo(joinPoint);

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}

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Object result = joinPoint.proceed();

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Log.i("bqt", "【@Around】返回值=" + ObjToStringUtils.toString(result)// null

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+ "  方法执行耗时=" + (SystemClock.currentThreadTimeMillis() - beginTime));//2

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return result;

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}

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//必须是静态方法

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private static void printJoinPointInfo(ProceedingJoinPoint joinPoint) {

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Log.i("bqt", "【@Around】MethodSignature"

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+ "\nKind=" + joinPoint.getKind()//method-execution

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+ "\nArgs=" + ObjToStringUtils.toString(joinPoint.getArgs())//[android.widget.TextView{d090a1d V.ED..C.. ...P.... 0,0-1440,210}]

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+ "\nSignature=" + ObjToStringUtils.toString(joinPoint.getSignature())//void com.bqt.aop.MainActivity.1.onClick(View)

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+ "\nSourceLocation=" + ObjToStringUtils.toString(joinPoint.getSourceLocation())//MainActivity.java:25

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+ "\nStaticPart=" + ObjToStringUtils.toString(joinPoint.getStaticPart())//execution(void com.bqt.aop.MainActivity.1.onClick(View))

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+ "\nTarget=" + ObjToStringUtils.toString(joinPoint.getTarget())//com.bqt.aop.MainActivity$1@d5c5492

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+ "\nThis=" + ObjToStringUtils.toString(joinPoint.getThis()));//com.bqt.aop.MainActivity$1@d5c5492

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}

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private static void printMethodSignatureInfo(MethodSignature signature) {

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//下面通过MethodSignature的方式获取方法的详细信息，也基本都可以通过Method对象获取

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Log.i("bqt", "【@Around】MethodSignature"

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+ "\n方法=" + ObjToStringUtils.toString(signature.getMethod())// public void com.bqt.aop.MainActivity$1.onClick(android.view.View)

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+ "\n方法名=" + signature.getName()// onClick

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+ "\n返回值类型=" + ObjToStringUtils.toString(signature.getReturnType())// void

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+ "\n声明类型=" + ObjToStringUtils.toString(signature.getDeclaringType())// class com.bqt.aop.MainActivity$1

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+ "\n声明类型名=" + signature.getDeclaringTypeName()// com.bqt.aop.MainActivity$1

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+ "\n异常类型=" + ObjToStringUtils.toString(signature.getExceptionTypes())// []

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+ "\n修饰符=" + signature.getModifiers()// 1，对应为 public static final int PUBLIC  = 0x00000001

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+ "\n参数名=" + ObjToStringUtils.toString(signature.getParameterNames())// ["v"]

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+ "\n参数类型=" + ObjToStringUtils.toString(signature.getParameterTypes()));// [class android.view.View]

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}

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private static void printArgs(ProceedingJoinPoint joinPoint) {

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String[] parameterNames = ((MethodSignature) joinPoint.getSignature()).getParameterNames();//获取参数名列表

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Object[] parameterValues = joinPoint.getArgs();//获取参数值列表

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StringBuilder builder = new StringBuilder("");

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for (int i = 0; i < parameterValues.length; i++) {

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builder.append("\n")

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.append(parameterNames[i])

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.append("=")//拼接参数名

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.append(ObjToStringUtils.toString(parameterValues[i]));//拼接参数值

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}

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Log.i("bqt", "【@Around】参数列表" + builder.toString());//v=android.widget.TextView{d090a1d V.ED..C.. ...P.... 0,0-1440,210}

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}

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private static void printParameterInfo(ProceedingJoinPoint joinPoint) {

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Object[] parameterValues = joinPoint.getArgs();//获取参数值列表

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for (Object obj : parameterValues) {

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if (obj instanceof TextView) {

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TextView textView = (TextView) obj;

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Log.i("bqt", "【@Around】TextView的信息"

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+ "  文字=" + textView.getText()

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+ "  所属界面=" + textView.getContext().getClass().getSimpleName()

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+ "  ID=" + textView.getId()

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+ "  父页面名称=" + textView.getParent().getClass().getSimpleName()

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);

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}

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}

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}

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}

定义拦截自定义注解的 Aspect

@Target({METHOD, CONSTRUCTOR})@Retention(RetentionPolicy.RUNTIME)public @interface CustomEvent {	String key();		String id() default "";		String name() default "";		String des() default "";}

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@Target({
            METHOD, CONSTRUCTOR})

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@Retention(RetentionPolicy.RUNTIME)

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public @interface CustomEvent {

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String key();

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String id() default "";

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String name() default "";

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String des() default "";

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}

package com.bqt.aop.aspectj;import android.util.Log;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.Signature;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.aspectj.lang.annotation.Pointcut;import org.aspectj.lang.reflect.ConstructorSignature;import org.aspectj.lang.reflect.MethodSignature;import java.lang.reflect.Constructor;import java.lang.reflect.Method;/** * 拦截所有具有【CustomEvent注解】的方法、构造方法 */@Aspectpublic class CustomEventAspect {	@Pointcut("within(@com.bqt.aop.aspectj.CustomEvent *)")	public void withinAnnotatedClass() {	}		@Pointcut("execution(* *(..)) && withinAnnotatedClass()")	public void methodInsideAnnotatedType() {	}		@Pointcut("execution(*.new(..)) && withinAnnotatedClass()")	public void constructorInsideAnnotatedType() {	}		@Pointcut("execution(@com.bqt.aop.aspectj.CustomEvent * *(..)) || methodInsideAnnotatedType()")	public void method() {	}		@Pointcut("execution(@com.bqt.aop.aspectj.CustomEvent *.new(..)) || constructorInsideAnnotatedType()")	public void constructor() {	}		@Before("method() || constructor()")	public void before(JoinPoint joinPoint) {		Log.i("bqt", "【@Before】");	}		@After("method() || constructor()")	public void after(JoinPoint joinPoint) {		Log.i("bqt", "【@After】");		addEvent(joinPoint);	}		private static void addEvent(JoinPoint joinPoint) {		CustomEvent customEvent = null;		Signature signature = joinPoint.getSignature();		if (signature instanceof MethodSignature) {//【public interface MethodSignature extends CodeSignature】			Method method = ((MethodSignature) signature).getMethod();			customEvent = method.getAnnotation(CustomEvent.class);		} else if (signature instanceof ConstructorSignature) {//【public interface ConstructorSignature extends CodeSignature】			Constructor constructor = ((ConstructorSignature) signature).getConstructor();			customEvent = (CustomEvent) constructor.getAnnotation(CustomEvent.class);		}		if (customEvent != null) {			Log.i("bqt", "【注解】" + customEvent.key() + "  " + customEvent.id() + "  " + customEvent.name() + "  " + customEvent.des());		}			}}

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package com.bqt.aop.aspectj;

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import android.util.Log;

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import org.aspectj.lang.JoinPoint;

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import org.aspectj.lang.Signature;

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import org.aspectj.lang.annotation.After;

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import org.aspectj.lang.annotation.Aspect;

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import org.aspectj.lang.annotation.Before;

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import org.aspectj.lang.annotation.Pointcut;

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import org.aspectj.lang.reflect.ConstructorSignature;

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import org.aspectj.lang.reflect.MethodSignature;

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import java.lang.reflect.Constructor;

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import java.lang.reflect.Method;

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/**

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* 拦截所有具有【CustomEvent注解】的方法、构造方法

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*/

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@Aspect

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public class CustomEventAspect {

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@Pointcut("within(@com.bqt.aop.aspectj.CustomEvent *)")

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public void withinAnnotatedClass() {

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}

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@Pointcut("execution(* *(..)) && withinAnnotatedClass()")

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public void methodInsideAnnotatedType() {

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}

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@Pointcut("execution(*.new(..)) && withinAnnotatedClass()")

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public void constructorInsideAnnotatedType() {

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}

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@Pointcut("execution(@com.bqt.aop.aspectj.CustomEvent * *(..)) || methodInsideAnnotatedType()")

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public void method() {

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}

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@Pointcut("execution(@com.bqt.aop.aspectj.CustomEvent *.new(..)) || constructorInsideAnnotatedType()")

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public void constructor() {

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}

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@Before("method() || constructor()")

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public void before(JoinPoint joinPoint) {

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Log.i("bqt", "【@Before】");

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}

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@After("method() || constructor()")

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public void after(JoinPoint joinPoint) {

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Log.i("bqt", "【@After】");

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addEvent(joinPoint);

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}

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private static void addEvent(JoinPoint joinPoint) {

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CustomEvent customEvent = null;

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Signature signature = joinPoint.getSignature();

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if (signature instanceof MethodSignature) {
            //【public interface MethodSignature extends CodeSignature】

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Method method = ((MethodSignature) signature).getMethod();

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customEvent = method.getAnnotation(CustomEvent.class);

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} else if (signature instanceof ConstructorSignature) {
            //【public interface ConstructorSignature extends CodeSignature】

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Constructor constructor = ((ConstructorSignature) signature).getConstructor();

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customEvent = (CustomEvent) constructor.getAnnotation(CustomEvent.class);

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}

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if (customEvent != null) {

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Log.i("bqt", "【注解】" + customEvent.key() + "  " + customEvent.id() + "  " + customEvent.name() + "  " + customEvent.des());

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}

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}

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}

一个实用的工具类

ObjToStringUtils

public class ObjToStringUtils {		private ObjToStringUtils() {		throw new AssertionError("No instances.");	}		public static String toString(Object obj) {		if (obj == null) return "null";		if (obj instanceof CharSequence) return '"' + printableToString(obj.toString()) + '"';				Class
      cls = obj.getClass();		if (Byte.class == cls) return byteToString((Byte) obj);		if (cls.isArray()) return arrayToString(cls.getComponentType(), obj);				return obj.toString();	}		private static String printableToString(String string) {		int length = string.length();		StringBuilder builder = new StringBuilder(length);		for (int i = 0; i < length; ) {			int codePoint = string.codePointAt(i);			switch (Character.getType(codePoint)) {				case Character.CONTROL:				case Character.FORMAT:				case Character.PRIVATE_USE:				case Character.SURROGATE:				case Character.UNASSIGNED:					switch (codePoint) {						case '\n':							builder.append("\\n");							break;						case '\r':							builder.append("\\r");							break;						case '\t':							builder.append("\\t");							break;						case '\f':							builder.append("\\f");							break;						case '\b':							builder.append("\\b");							break;						default:							builder.append("\\u").append(String.format("%04x", codePoint).toUpperCase(Locale.US));							break;					}					break;				default:					builder.append(Character.toChars(codePoint));					break;			}			i += Character.charCount(codePoint);		}		return builder.toString();	}		private static String arrayToString(Class
      cls, Object obj) {		if (byte.class == cls) return byteArrayToString((byte[]) obj);		if (short.class == cls) return Arrays.toString((short[]) obj);		if (char.class == cls) return Arrays.toString((char[]) obj);		if (int.class == cls) return Arrays.toString((int[]) obj);		if (long.class == cls) return Arrays.toString((long[]) obj);		if (float.class == cls) return Arrays.toString((float[]) obj);		if (double.class == cls) return Arrays.toString((double[]) obj);		if (boolean.class == cls) return Arrays.toString((boolean[]) obj);		return arrayToString((Object[]) obj);	}		/**	 * A more human-friendly version of Arrays#toString(byte[]) that uses hex representation.	 */	private static String byteArrayToString(byte[] bytes) {		StringBuilder builder = new StringBuilder("[");		for (int i = 0; i < bytes.length; i++) {			if (i > 0) builder.append(", ");			builder.append(byteToString(bytes[i]));		}		return builder.append(']').toString();	}		private static String byteToString(Byte b) {		if (b == null) return "null";		return "0x" + String.format("%02x", b).toUpperCase(Locale.US);	}		private static String arrayToString(Object[] array) {		StringBuilder buf = new StringBuilder();		arrayToString(array, buf, new HashSet
     
      ());		return buf.toString();	}		private static void arrayToString(Object[] array, StringBuilder builder, Set
      
        seen) {		if (array == null) {			builder.append("null");			return;		}				seen.add(array);		builder.append('[');		for (int i = 0; i < array.length; i++) {			if (i > 0) builder.append(", ");						Object element = array[i];			if (element == null) {				builder.append("null");			} else {				Class elementClass = element.getClass();				if (elementClass.isArray() && elementClass.getComponentType() == Object.class) {					Object[] arrayElement = (Object[]) element;					if (seen.contains(arrayElement)) builder.append("[...]");					else arrayToString(arrayElement, builder, seen);				} else {					builder.append(toString(element));				}			}		}		builder.append(']');		seen.remove(array);	}}
      
     

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public class ObjToStringUtils {

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private ObjToStringUtils() {

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throw new AssertionError("No instances.");

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}

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public static String toString(Object obj) {

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if (obj == null) return "null";

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if (obj instanceof CharSequence) return '"' + printableToString(obj.toString()) + '"';

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Class
               cls = obj.getClass();

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if (Byte.class == cls) return byteToString((Byte) obj);

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if (cls.isArray()) return arrayToString(cls.getComponentType(), obj);

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return obj.toString();

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}

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private static String printableToString(String string) {

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int length = string.length();

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StringBuilder builder = new StringBuilder(length);

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for (int i = 0; i < length; ) {

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int codePoint = string.codePointAt(i);

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switch (Character.getType(codePoint)) {

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case Character.CONTROL:

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case Character.FORMAT:

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case Character.PRIVATE_USE:

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case Character.SURROGATE:

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case Character.UNASSIGNED:

29

switch (codePoint) {

30

case '\n':

31

builder.append("\\n");

32

break;

33

case '\r':

34

builder.append("\\r");

35

break;

36

case '\t':

37

builder.append("\\t");

38

break;

39

case '\f':

40

builder.append("\\f");

41

break;

42

case '\b':

43

builder.append("\\b");

44

break;

45

default:

46

builder.append("\\u").append(String.format("%04x", codePoint).toUpperCase(Locale.US));

47

break;

48

}

49

break;

50

default:

51

builder.append(Character.toChars(codePoint));

52

break;

53

}

54

i += Character.charCount(codePoint);

55

}

56

return builder.toString();

57

}

58

59

private static String arrayToString(Class
               cls, Object obj) {

60

if (byte.class == cls) return byteArrayToString((byte[]) obj);

61

if (short.class == cls) return Arrays.toString((short[]) obj);

62

if (char.class == cls) return Arrays.toString((char[]) obj);

63

if (int.class == cls) return Arrays.toString((int[]) obj);

64

if (long.class == cls) return Arrays.toString((long[]) obj);

65

if (float.class == cls) return Arrays.toString((float[]) obj);

66

if (double.class == cls) return Arrays.toString((double[]) obj);

67

if (boolean.class == cls) return Arrays.toString((boolean[]) obj);

68

return arrayToString((Object[]) obj);

69

}

70

71

/**

72

* A more human-friendly version of Arrays#toString(byte[]) that uses hex representation.

73

*/

74

private static String byteArrayToString(byte[] bytes) {

75

StringBuilder builder = new StringBuilder("[");

76

for (int i = 0; i < bytes.length; i++) {

77

if (i > 0) builder.append(", ");

78

builder.append(byteToString(bytes[i]));

79

}

80

return builder.append(']').toString();

81

}

82

83

private static String byteToString(Byte b) {

84

if (b == null) return "null";

85

return "0x" + String.format("%02x", b).toUpperCase(Locale.US);

86

}

87

88

private static String arrayToString(Object[] array) {

89

StringBuilder buf = new StringBuilder();

90

arrayToString(array, buf, new HashSet
              
               ());
              

91

return buf.toString();

92

}

93

94

private static void arrayToString(Object[] array, StringBuilder builder, Set
              
                seen) {
              

95

if (array == null) {

96

builder.append("null");

97

return;

98

}

99

100

seen.add(array);

101

builder.append('[');

102

for (int i = 0; i < array.length; i++) {

103

if (i > 0) builder.append(", ");

104

105

Object element = array[i];

106

if (element == null) {

107

builder.append("null");

108

} else {

109

Class elementClass = element.getClass();

110

if (elementClass.isArray() && elementClass.getComponentType() == Object.class) {

111

Object[] arrayElement = (Object[]) element;

112

if (seen.contains(arrayElement)) builder.append("[...]");

113

else arrayToString(arrayElement, builder, seen);

114

} else {

115

builder.append(toString(element));

116

}

117

}

118

}

119

builder.append(']');

120

seen.remove(array);

121

}

122

}

2018-4-27