org.apache.commons.lang.exception.ExceptionUtils#getCause ( )源码实例Demo

/**
 * 为解决嵌套Exception的异常输出问题，针对无message的递归获取cause的节点，保证拿到正确的cause异常 <br/>
 * 如果自己有设置过message，以当前异常的message为准
 */
public String getMessage() {
    if (super.getMessage() != null) {
        return super.getMessage();
    } else {
        Throwable ca = this;
        do {
            Throwable c = ExceptionUtils.getCause(ca);
            if (c != null) {
                ca = c;
            } else {
                break;
            }
        } while (ca.getMessage() == null);
        return ca.getMessage();
    }
}
 

/**
 * 为解决嵌套Exception的异常输出问题，针对无message的递归获取cause的节点，保证拿到正确的cause异常 <br/>
 * 如果自己有设置过message，以当前异常的message为准
 */
@Override
public String getMessage() {
    if (super.getMessage() != null) {
        return super.getMessage();
    } else if (cause != null) {
        Throwable ca = cause;
        while (this.getClass().isInstance(ca) && ca.getMessage() == null) {
            Throwable c = ExceptionUtils.getCause(ca);
            if (c != null) {
                ca = c;
            } else {
                break;
            }
        }

        if (ca != null) {
            return ca.getMessage();
        } else {
            return null;
        }
    } else {
        return null;
    }
}
 

/**
 * <p>Returns the list of <code>Throwable</code> objects in the
 * exception chain.</p>
 *
 * <p>A throwable without cause will return a list containing
 * one element - the input throwable.
 * A throwable with one cause will return a list containing
 * two elements. - the input throwable and the cause throwable.
 * A <code>null</code> throwable will return a list of size zero.</p>
 *
 * <p>This method handles recursive cause structures that might
 * otherwise cause infinite loops. The cause chain is processed until
 * the end is reached, or until the next item in the chain is already
 * in the result set.</p>
 *
 * @param throwable  the throwable to inspect, may be null
 * @return the list of throwables, never null
 * @since Commons Lang 2.2
 */
public static List getThrowableList(Throwable throwable) {
    List list = new ArrayList();
    while (throwable != null && list.contains(throwable) == false) {
        list.add(throwable);
        throwable = ExceptionUtils.getCause(throwable);
    }
    return list;
}
 

/**
 * <p>Returns the list of <code>Throwable</code> objects in the
 * exception chain.</p>
 *
 * <p>A throwable without cause will return a list containing
 * one element - the input throwable.
 * A throwable with one cause will return a list containing
 * two elements. - the input throwable and the cause throwable.
 * A <code>null</code> throwable will return a list of size zero.</p>
 *
 * <p>This method handles recursive cause structures that might
 * otherwise cause infinite loops. The cause chain is processed until
 * the end is reached, or until the next item in the chain is already
 * in the result set.</p>
 *
 * @param throwable  the throwable to inspect, may be null
 * @return the list of throwables, never null
 * @since Commons Lang 2.2
 */
public static List getThrowableList(Throwable throwable) {
    List list = new ArrayList();
    while (throwable != null && list.contains(throwable) == false) {
        list.add(throwable);
        throwable = ExceptionUtils.getCause(throwable);
    }
    return list;
}
 

/**
 * <p>Returns the list of <code>Throwable</code> objects in the
 * exception chain.</p>
 *
 * <p>A throwable without cause will return a list containing
 * one element - the input throwable.
 * A throwable with one cause will return a list containing
 * two elements. - the input throwable and the cause throwable.
 * A <code>null</code> throwable will return a list of size zero.</p>
 *
 * <p>This method handles recursive cause structures that might
 * otherwise cause infinite loops. The cause chain is processed until
 * the end is reached, or until the next item in the chain is already
 * in the result set.</p>
 *
 * @param throwable  the throwable to inspect, may be null
 * @return the list of throwables, never null
 * @since Commons Lang 2.2
 */
public static List getThrowableList(Throwable throwable) {
    List list = new ArrayList();
    while (throwable != null && list.contains(throwable) == false) {
        list.add(throwable);
        throwable = ExceptionUtils.getCause(throwable);
    }
    return list;
}