Guava Throwables 类
Throwable 类，简化异常和错误的传播与检查
官方文档：Throwables (Guava: Google Core Libraries for Java 27.0.1-jre API)
| 方法类型 | 方法描述 |
|---|---|
static List<Throwable> | getCausalChain(Throwable throwable)?获取一个Throwable的原因链的列表. |
static?<X?extends?Throwable>X | getCauseAs(Throwable throwable, Class<X>?expectedCauseType)?返回throwable的原因，强制转换为expectedCauseType. |
static Throwable | getRootCause(Throwable throwable)?返回抛出的最里面的原因. |
static String | getStackTraceAsString(Throwable throwable)?返回包含toString()的结果字符串，随后完整抛出，递归的堆栈跟踪。 |
static List<StackTraceElement> | lazyStackTrace(Throwable throwable)?返回throwable的堆栈跟踪，可能在整个跟踪上提供较慢的迭代，但在部分跟踪上的迭代速度更快. |
static boolean | lazyStackTraceIsLazy()?返回lazyStackTrace（java.lang.Throwable）是否将使用其文档中描述的特殊实现。 |
static RuntimeException | propagate(Throwable throwable)?把throwable包装成RuntimeException，用该方法保证异常传递，抛出一个RuntimeException异常. |
static?<X?extends?Throwable>void | propagateIfInstanceOf(@Nullable Throwable throwable, Class<X>declaredType)?Throwable类型为X才抛出. |
static void | propagateIfPossible(@Nullable Throwable throwable)?Throwable类型为Error或RuntimeException才抛出。 |
static?<X?extends?Throwable>void | propagateIfPossible(@Nullable Throwable throwable, Class<X>declaredType)?Throwable类型为X, Error或RuntimeException才抛出. |
static?<X?extends?Throwable>void | throwIfInstanceOf(Throwable throwable, Class<X>?declaredType)?如果是declaredType的实例，则抛出throwable. |
static void | throwIfUnchecked(Throwable throwable)?如果是RuntimeException或Error，则抛出throwable. |
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);
}
}
}