Java Exception toString() inclusive 原因

Question

有没有什么好的函数可以把所有的Exception原因收集到一个字符串中？printStackTrace() 方法使用 StackTraces 收集它们:

   HighLevelException: MidLevelException: LowLevelException
           at Junk.a(Junk.java:13)
           at Junk.main(Junk.java:4)
   Caused by: MidLevelException: LowLevelException
           at Junk.c(Junk.java:23)
           at Junk.b(Junk.java:17)
           at Junk.a(Junk.java:11)
           ... 1 more
   Caused by: LowLevelException
           at Junk.e(Junk.java:30)
           at Junk.d(Junk.java:27)
           at Junk.c(Junk.java:21)
           ... 3 more

但我只想要原因的getMessage():

   HighLevelException: MidLevelException: LowLevelException
   Caused by: MidLevelException: LowLevelException
   Caused by: LowLevelException

我应该自己写函数吗？

Answer 1

是的，你必须为此编写一个简单的方法

static String message(Throwable e) {
    StringBuilder sb = new StringBuilder();
    sb.append(e.getMessage());
    Throwable t = e.getCause();
    while (t != null) {
        sb.append("\nCaused by: ").append(t.getMessage());
        t = t.getCause();
    }
    return sb.toString();
}