update book code

eBook/exercises/chapter_15/twitter_status_json.go

@@ -0,0 +1,33 @@
+// twitter_status_json.go
+package main  
+  
+import (  
+       "net/http"  
+       "fmt"  
+       "encoding/json"
+	   "io/ioutil" 
+)  
+  
+type Status struct {  
+     Text string  
+}  
+  
+type User struct {  
+     Status Status  
+}  
+  
+func main()  {  
+     /* perform an HTTP request for the twitter status of user: Googland */  
+     res, _:= http.Get("http://twitter.com/users/Googland.json")  
+     /* initialize the structure of the JSON response */  
+     user := User{Status{""}}  
+     /* unmarshal the JSON into our structures */  
+	 temp, _ := ioutil.ReadAll(res.Body)
+	 body := []byte(temp)
+     json.Unmarshal(body, &user) 
+     fmt.Printf("status: %s", user.Status.Text)  
+}  
+/* Output:
+status: Robot cars invade California, on orders from Google: 
+Google has been testing self-driving cars ... http://bit.ly/cbtpUN http://retwt.me/97p
+*/