Guava学习笔记(5)Throwables简化异常处理

有时候, 我们需要捕获异常, 你想要传递异常到下一个try/catch块中. RuntimeException或Error是不强制捕获的.

Guava提供了一些工具类, 可以简单地捕获和重新抛出多个异常.

   try {
     someMethodThatCouldThrowAnything();
   } catch (IKnowWhatToDoWithThisException e) {
     handle(e);
   } catch (Throwable t) {
     Throwables.propagateIfInstanceOf(t, IOException.class);
     Throwables.propagateIfInstanceOf(t, SQLException.class);
     throw Throwables.propagate(t);
   }

简单使用示例

import java.io.IOException;

import com.google.common.base.Throwables;

public class Demo {
    public static void main(String[] args) throws IOException {
        try {
            throw new IOException();
        } catch (Throwable t) {
            Throwables.propagateIfInstanceOf(t, IOException.class);
            throw Throwables.propagate(t);
        }
    }
}

参考文献:

1. 官方文档: http://code.google.com/p/guava-libraries/wiki/ThrowablesExplained