GoLang Json FXCM（外汇资本市场）

huangapple
go评论119阅读模式
英文:

GoLang Json FXCM

问题

为什么这段代码没有输出字符串？有人知道如何让这段代码工作吗？

  1. package main
  3. import (
  4. 	"bytes"
  5. 	"encoding/json"
  6. 	"fmt"
  7. )
  9. type Tick struct {
  10. 	Query string `json:"query"`
  11. }
  13. func main() {
  14. 	data := &Tick{Query: "https://ratesjson.fxcm.com/DataDisplayer?&callback=Tick"}
  15. 	buf := new(bytes.Buffer)
  16. 	enc := json.NewEncoder(buf)
  17. 	enc.SetEscapeHTML(true)
  18. 	_ = enc.Encode(data)
  19. 	fmt.Println(string(buf.Tick()))
  20. 	fmt.Println("Done")
  21. }

有人知道为什么这是无效的 JSON 或者为什么无法解析吗？或者指出如何修复让它工作？

  1. package main
  3. import (
  4. 	"log"
  5. 	"fmt"
  6. 	"net/http"
  7. 	"bytes"
  8. 	"io/ioutil"
  9. 	"github.com/pquerna/ffjson/ffjson"
  10. )
  13. type MsgRatesArray struct {
  14. 	RateQuote []MsgRateQuoteJson `json:"Rates"`
  15. }
  16. type MsgRateQuoteJson struct {
  17. 	SymbolName   string `json:"Symbol"`
  18. 	SymbolBid    int64  `json:"Bid"`
  19. 	SymbolAsk    int64  `json:"Ask"`
  20. 	SymbolSpread int64  `json:"Spread"`
  21. 	SymbolPT     string `json:"ProductType"`
  22. }
  24. var respBytes []byte
  26. func main() {
  27. 	var msg MsgRatesArray
  28. 	response, err := http.Get("https://ratesjson.fxcm.com/DataDisplayer?&callback=Tick")
  29. 	if err != nil {
  30. 		log.Fatal(err)
  31. 	}
  32. 	defer response.Body.Close()
  33. 	respBytes, err := ioutil.ReadAll(response.Body)
  36. 	jsonBytes := respBytes[bytes.Index(respBytes, []byte("{")):bytes.LastIndex(respBytes, []byte("}"))+1]
  37. 	jsonString := string(jsonBytes)
  38. 	fmt.Println(jsonString)
  39. 	err = ffjson.Unmarshal(jsonBytes, &msg)
  40. 	if err != nil {
  41. 		panic(err)
  42. 	}
  43. }
英文:

Why is this not dumping out the string? Anyone have any ideas how to get this code working?

  1. package main
  3. import (
  4.         "bytes"
  5.         "encoding/json"
  6.         "fmt"
  7. )
  9. type Tick struct {
  10.         Query string `json:"query"`
  11. }
  13. func main() {
  14.         data := &Tick{Query: "https://ratesjson.fxcm.com/DataDisplayer?&callback=Tick"}
  15.         buf := new(bytes.Buffer)
  16.         enc := json.NewEncoder(buf)
  17.         enc.SetEscapeHTML(true)
  18.         _ = enc.Encode(data)
  19.         fmt.Println(string(buf.Tick()))
  20.         fmt.Println("Done")
  21. }

Anyone know why this is invalid json or why this can not be parsed? Or point out the fix how to make this work?

  1. package main
  3. import (
  4.         "log"
  5.         "fmt"
  6.         "net/http"
  7.         "bytes"
  8.         "io/ioutil"
  9.         "github.com/pquerna/ffjson/ffjson"
  10. )
  13. type MsgRatesArray struct {
  14.         RateQuote []MsgRateQuoteJson `json:"Rates"`
  15. }
  16. type MsgRateQuoteJson struct {
  17.         SymbolName string `json:"Symbol"`
  18.         SymbolBid int64 `json:"Bid"`
  19.         SymbolAsk int64 `json:"Ask"`
  20.         SymbolSpread int64 `json:"Spread"`
  21.         SymbolPT string `json:"ProductType"`
  22. }
  24. var respBytes []byte
  26. func main() {
  27.     var msg MsgRatesArray
  28.     response,err := http.Get("https://ratesjson.fxcm.com/DataDisplayer?&callback=Tick")
  29.     if err != nil {
  30.         log.Fatal(err)
  31.     }
  32.     defer response.Body.Close()
  33.     respBytes, err := ioutil.ReadAll(response.Body)
  36.     jsonBytes := respBytes[bytes.Index(respBytes, []byte("{")):bytes.LastIndex(respBytes, []byte("}"))+1]
  37.     jsonString := string(jsonBytes)
  38.     fmt.Println(jsonString)
  39.     err = ffjson.Unmarshal(jsonBytes, &msg)
  40.     if err != nil {
  41.         panic(err)
  42.     }
  43. }

答案1

得分: 0

执行自己的http请求以获取json数据，然后剥离非json内容（即第一个{之前和最后一个}之后的所有内容）：

  1. response,err := http.Get("https://ratesjson.fxcm.com/DataDisplayer?&callback=Tick")
  2. if err != nil {
  3.     log.Fatal(err)
  4. }
  5. defer response.Body.Close()
  6. respBytes, err := ioutil.ReadAll(response.Body)
  7. jsonBytes := respBytes[bytes.Index(respBytes, []byte("{")):bytes.LastIndex(respBytes, []byte("}"))+1]
  8. jsonString := string(jsonBytes)
  9. fmt.Println(jsonString)

https://play.golang.org/p/JyibZ3g6UA

英文:

Do your own http request to get the json, then strip out the non json stuff (everything before the first { and after the last }:

  1. response,err := http.Get("https://ratesjson.fxcm.com/DataDisplayer?&callback=Tick")
  2. if err != nil {
  3.     log.Fatal(err)
  4. }
  5. defer response.Body.Close()
  6. respBytes, err := ioutil.ReadAll(response.Body)
  7. jsonBytes := respBytes[bytes.Index(respBytes, []byte("{")):bytes.LastIndex(respBytes, []byte("}"))+1]
  8. jsonString := string(jsonBytes)
  9. fmt.Println(jsonString)

https://play.golang.org/p/JyibZ3g6UA

huangapple
  • 本文由 发表于 2017年4月28日 01:09:05
  • 转载请务必保留本文链接：https://go.coder-hub.com/43664018.html
  • go
  • json
  • url
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