[英]I'm stuck with json.marshal in go
我幾天前就開始了我的新手。 我想連接到mongodb,搜索,創建服務並將其用於角度。 我幾乎完成了所有事情,但我遇到了json.marshal()的問題。 有人能告訴我我做錯了什么,還是有更好的方法? 謝謝 :)
錯誤是“./main.go:96:單值上下文中的多值json.Marshal()”
package main
import (
"encoding/json"
"flag"
"fmt"
"github.com/gorilla/mux"
"labix.org/v2/mgo"
"labix.org/v2/mgo/bson"
"log"
"net/http"
)
type warrior struct {
Name string `json:"name"`
LowDamage int `json:"low_damage"`
HighDamage int `json:"high_damage"`
Health int `json:"health"`
HealthLeft int `json:"health_left"`
Armor int `json:"armor"`
Id bson.ObjectId "_id,omitempty"
}
func getWarriors(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
w.Write(mongo())
}
func main() {
// command line flags
port := flag.Int("port", 5001, "port to serve on")
dir := flag.String("random message 1", "web/", "random message 2")
flag.Parse()
// handle all requests by serving a file of the same name
fs := http.Dir(*dir)
fileHandler := http.FileServer(fs)
// ROUTES
router := mux.NewRouter()
router.Handle("/", http.RedirectHandler("/static/", 302))
router.HandleFunc("/warriors", getWarriors).Methods("GET")
router.PathPrefix("/static/").Handler(http.StripPrefix("/static", fileHandler))
http.Handle("/", router)
log.Printf("Running on port %d\n", *port)
addr := fmt.Sprintf("127.0.0.1:%d", *port)
err := http.ListenAndServe(addr, nil)
fmt.Println(err.Error())
}
func mongo() []byte {
session, err := mgo.Dial("mongodb://localhost:27017/test")
if err != nil {
panic(err)
}
defer session.Close()
// Optional. Switch the session to a monotonic behavior.
session.SetMode(mgo.Monotonic, true)
// select dm + table name
c := session.DB("test").C("warriors")
e := warrior{
Name: "first event",
LowDamage: 2,
HighDamage: 4,
Health: 40,
HealthLeft: 40,
Armor: 1,
}
// insert data
err = c.Insert(e)
if err != nil {
panic(err)
}
// search show results []warrior{} for all warrior{}
result := []warrior{}
// err = c.Find(bson.M{"name": "first event"}).One(&result)
err = c.Find(bson.M{"name": "first event"}).Limit(10).All(&result)
if err != nil {
panic(err)
}
b := json.Marshal(result)
log.Println("JSON:", result)
return b
}
請查看此函數的文檔: http : //golang.org/pkg/encoding/json/#Marshal
func Marshal(v interface{}) ([]byte, error)
它返回兩個值。 這里的問題是你只需給它一個變量來獲得這兩個值:
b := json.Marshal(result)
所以你只需要這樣糾正:
b, err := json.Marshal(result)
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