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package main
import (
"fmt"
"log"
"net/http"
)
/**
从golang的异常机制可以看出，异常处理recover最好是在接口的入口处
就将其插入到对应defer队列中。这样在接口调用过程中，即使发生异常，
程序依然可以提供服务。
*/
func HelloServer(w http.ResponseWriter, req *http.Request) {
//在可能出现异常的函数调用前，使用defer进行加入defer队列，即使出现异常，也不会整个进程退出~
defer func() {
if err := recover(); err != nil {
fmt.Println(err)
}
}()
//调用函数
var MakecoreData *int = nil
*MakecoreData = 10000
fmt.Fprintf(w, "hello world")
func main() {
http.HandleFunc("/hello", HelloServer)
err := http.ListenAndServe(":12345", nil)
if err != nil {
log.Fatal("ListenAndServe: ", err)
