Guava：Throwables 异常工具

Guava Throwables 类

Throwable 类，简化异常和错误的传播与检查

类方法说明

官方文档：Throwables (Guava: Google Core Libraries for Java 27.0.1-jre API)

测试Demo

import com.google.common.base.Throwables;
import org.junit.Test;

import java.io.IOException;
import java.util.List;

public class ThrowablesTests {

    public void getException(){
        int[] data = {1, 2, 3};
        int datum = data[4];
    }

    @Test
    public void test1() {
        try {
            getException();
        } catch (Exception e) {
            List<Throwable> causalChain = Throwables.getCausalChain(e);
            System.out.println(causalChain);
        }
    }

    @Test
    public void test2() {
        try {
            // 模拟抛出一个异常
            throw new IOException("An I/O error occurred");
        } catch (Exception e) {
            // 获取异常的原因，并检查是否为 IOException 类型或其子类型
            Throwable cause = Throwables.getCauseAs(e, IOException.class);
            if (cause != null) {
                System.out.println("Cause is an IOException: " + cause.getMessage());
            } else {
                System.out.println("Cause is not an IOException");
            }
        }
    }

    @Test
    public void test3() {
        try {
            // 模拟抛出一个嵌套多层的异常
            throw new IOException("An I/O error occurred");
        } catch (Exception e) {
            Throwable rootCause = Throwables.getRootCause(e);
            String stackTraceAsString = Throwables.getStackTraceAsString(rootCause);
            System.out.println(stackTraceAsString);
        }
    }
}