异常处理

错误处理

我们抛出一个异常

package main

import (
	"errors"
	"fmt"
)

var errNotFound error = errors.New("Not found error")

func main() {
	fmt.Printf("error: %v", errNotFound)
}

从panic中恢复，就是如果有错误还是会继续执行程序

package main

import (
	"fmt"
)

func badCall() {
	panic("bad end")
}

func test() {
	defer func() {
		if e := recover(); e != nil {
			fmt.Printf("Panicing %s\r\n", e)
		}
	}()
	badCall()
	fmt.Printf("After bad call\r\n") // <-- wordt niet bereikt
}

func main() {
	fmt.Printf("Calling test\r\n")
	test()
	fmt.Printf("Test completed\r\n")
}

输出

Calling test
Panicing bad end
Test completed