如何使用Arthas查看类变量值

article/2025/9/13 7:31:07

使用arthas查看类变量值核心思路是：通过实现ApplicationContextAware接口定义ApplicationUtil类，该类可以获取ApplicationContext的所有的Bean实例，然后通过arthas的ognl查看类实例中的属性值。

搭建简易Spring Boot工程

1. pom依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>zqh.test</groupId><artifactId>SpringBootTest</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target></properties><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.19.RELEASE</version></parent><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project>

2. Spring Boot 启动类

package com.zqh.main;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;/*** @author fangchen* @date 2022-01-08 14:33*/
@SpringBootApplication(scanBasePackages = {"com.zqh.bean"})
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}
}

3. 实现 ApplicationContextAware 接口的工具类

package com.zqh.bean;import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;/*** @author fangchen* @date 2022-01-08 14:49*/
@Component
public class ApplicationUtil implements ApplicationContextAware {private static ApplicationContext applicationContext;@Overridepublic void setApplicationContext(ApplicationContext args) throws BeansException {applicationContext = args;}public static Object getBean(String beanName) {return applicationContext.getBean(beanName);}
}

4. 查看目标类

package com.zqh.bean;import org.springframework.stereotype.Component;/*** @author fangchen* @date 2022-01-08 14:35*/
@Component("testBean")
public class TestBean {private int a = 9;private String str = "this is bboy zqh!";
}

使用Arthas查看类变量值

1. 启动 Spring Boot 中的 main 方法

运行Application类，启动成功日志：

2. 下载并启动arthas

# 下载arthas
curl -O https://arthas.aliyun.com/arthas-boot.jar# 启动arthas，并找到相应进程，选择，这里是第一个
java -jar arthas-boot.jar[INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
* [1]: 71175 com.zqh.main.Application[2]: 70851 /Users/zhuqiuhui/.flow/resources/player.jar[3]: 70850 /Users/zhuqiuhui/.flow/resources/kafka.jar[4]: 70852 /Users/zhuqiuhui/.flow/resources/webapp.jar[5]: 71174 org.jetbrains.jps.cmdline.Launcher[6]: 36375[7]: 68267 /Users/zhuqiuhui/.flow/resources/kafka.jar[8]: 70861 org.jetbrains.idea.maven.server.RemoteMavenServer[9]: 70732

3. 使用arthas查看类变量值

[arthas@71175]$ ognl '@com.zqh.bean.ApplicationUtil@getBean("testBean").a'
@Integer[9][arthas@71175]$ ognl '@com.zqh.bean.ApplicationUtil@getBean("testBean").str'
@String[this is bboy zqh!]

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