第一节课 ｜ 青训营笔记

这是我参与「第三届青训营 -后端场」笔记创作活动的的第1篇笔记

简单记录一下，没排版

1.实际业务逻辑函数一般返回两个值，第一个是真正的返回值，第二个是错误信息

2.go语言错误处理

if err != nil{
    //do something
}

当出现不等于nil时，说明出现了一些错误

3.格式化输出%v简单输出，%+v更详细输出

4.当我们从键盘输入回车键时，Windows系统会把回车键当做\r\n 来处理，而Linux系统只会当做\n 来处理

curl转换小工具：curlconverter.com/#go

错误处理很重要！实际工业逻辑中这个很重要！

作业1： 简单改为scanf即可，很简单

作业2：常用的有道词典 注意是trans项不是dict项 运用课堂上的两个小工具转化即可

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strings"
)

type DictResponse struct {
	ReturnPhrase []string `json:"returnPhrase"`
	Query        string   `json:"query"`
	ErrorCode    string   `json:"errorCode"`
	L            string   `json:"l"`
	TSpeakURL    string   `json:"tSpeakUrl"`
	Web          []struct {
		Value []string `json:"value"`
		Key   string   `json:"key"`
	} `json:"web"`
	RequestID   string   `json:"requestId"`
	Translation []string `json:"translation"`
	Dict        struct {
		URL string `json:"url"`
	} `json:"dict"`
	Webdict struct {
		URL string `json:"url"`
	} `json:"webdict"`
	Basic struct {
		ExamType   []string `json:"exam_type"`
		UsPhonetic string   `json:"us-phonetic"`
		Phonetic   string   `json:"phonetic"`
		UkPhonetic string   `json:"uk-phonetic"`
		Wfs        []struct {
			Wf struct {
				Name  string `json:"name"`
				Value string `json:"value"`
			} `json:"wf"`
		} `json:"wfs"`
		UkSpeech string   `json:"uk-speech"`
		Explains []string `json:"explains"`
		UsSpeech string   `json:"us-speech"`
	} `json:"basic"`
	IsWord   bool   `json:"isWord"`
	SpeakURL string `json:"speakUrl"`
}

func query(word string) {
	client := &http.Client{}
	var data = strings.NewReader(`q=hello&from=Auto&to=Auto`)
	req, err := http.NewRequest("POST", "https://aidemo.youdao.com/trans", data)
	if err != nil {
		log.Fatal(err)
	}
	req.Header.Set("authority", "aidemo.youdao.com")
	req.Header.Set("accept", "application/json, text/javascript, */*; q=0.01")
	req.Header.Set("accept-language", "zh-CN,zh;q=0.9")
	req.Header.Set("content-type", "application/x-www-form-urlencoded; charset=UTF-8")
	req.Header.Set("origin", "https://ai.youdao.com")
	req.Header.Set("referer", "https://ai.youdao.com/")
	req.Header.Set("sec-ch-ua", `" Not A;Brand";v="99", "Chromium";v="101", "Google Chrome";v="101"`)
	req.Header.Set("sec-ch-ua-mobile", "?0")
	req.Header.Set("sec-ch-ua-platform", `"Windows"`)
	req.Header.Set("sec-fetch-dest", "empty")
	req.Header.Set("sec-fetch-mode", "cors")
	req.Header.Set("sec-fetch-site", "same-site")
	req.Header.Set("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.54 Safari/537.36")
	resp, err := client.Do(req)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
	bodyText, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatal(err)
	}
	if resp.StatusCode != 200 {
		log.Fatal("bad StatusCode:", resp.StatusCode, "body", string(bodyText))
	}
	var dictResponse DictResponse
	err = json.Unmarshal(bodyText, &dictResponse)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(word)
	for _, item := range dictResponse.Basic.Explains {
		fmt.Println(item)
	}
}

func main() {
	if len(os.Args) != 2 {
		fmt.Fprintf(os.Stderr, `usage: simpleDict WORD
example: simpleDict hello
		`)
		os.Exit(1)
	}
	word := os.Args[1]
	query(word)
}

作业3： 随手搞了一个，不算真正的并发，不能实现那个快先选哪个的功能

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strings"
	"sync"
)

type DictRequest struct {
	TransType string `json:"trans_type"`
	Source    string `json:"source"`
	UserID    string `json:"user_id"`
}

type DictResponse1 struct {
	ReturnPhrase []string `json:"returnPhrase"`
	Query        string   `json:"query"`
	ErrorCode    string   `json:"errorCode"`
	L            string   `json:"l"`
	TSpeakURL    string   `json:"tSpeakUrl"`
	Web          []struct {
		Value []string `json:"value"`
		Key   string   `json:"key"`
	} `json:"web"`
	RequestID   string   `json:"requestId"`
	Translation []string `json:"translation"`
	Dict        struct {
		URL string `json:"url"`
	} `json:"dict"`
	Webdict struct {
		URL string `json:"url"`
	} `json:"webdict"`
	Basic struct {
		ExamType   []string `json:"exam_type"`
		UsPhonetic string   `json:"us-phonetic"`
		Phonetic   string   `json:"phonetic"`
		UkPhonetic string   `json:"uk-phonetic"`
		Wfs        []struct {
			Wf struct {
				Name  string `json:"name"`
				Value string `json:"value"`
			} `json:"wf"`
		} `json:"wfs"`
		UkSpeech string   `json:"uk-speech"`
		Explains []string `json:"explains"`
		UsSpeech string   `json:"us-speech"`
	} `json:"basic"`
	IsWord   bool   `json:"isWord"`
	SpeakURL string `json:"speakUrl"`
}

type DictResponse struct {
	Rc   int `json:"rc"`
	Wiki struct {
		KnownInLaguages int `json:"known_in_laguages"`
		Description     struct {
			Source string      `json:"source"`
			Target interface{} `json:"target"`
		} `json:"description"`
		ID   string `json:"id"`
		Item struct {
			Source string `json:"source"`
			Target string `json:"target"`
		} `json:"item"`
		ImageURL  string `json:"image_url"`
		IsSubject string `json:"is_subject"`
		Sitelink  string `json:"sitelink"`
	} `json:"wiki"`
	Dictionary struct {
		Prons struct {
			EnUs string `json:"en-us"`
			En   string `json:"en"`
		} `json:"prons"`
		Explanations []string      `json:"explanations"`
		Synonym      []string      `json:"synonym"`
		Antonym      []string      `json:"antonym"`
		WqxExample   [][]string    `json:"wqx_example"`
		Entry        string        `json:"entry"`
		Type         string        `json:"type"`
		Related      []interface{} `json:"related"`
		Source       string        `json:"source"`
	} `json:"dictionary"`
}

func query(word string) {
	fmt.Println("query with caiyun")
	client := &http.Client{}
	request := DictRequest{TransType: "en2zh", Source: word}
	buf, err := json.Marshal(request)
	if err != nil {
		log.Fatal(err)
	}
	var data = bytes.NewReader(buf)
	req, err := http.NewRequest("POST", "https://api.interpreter.caiyunai.com/v1/dict", data)
	if err != nil {
		log.Fatal(err)
	}
	req.Header.Set("Connection", "keep-alive")
	req.Header.Set("DNT", "1")
	req.Header.Set("os-version", "")
	req.Header.Set("sec-ch-ua-mobile", "?0")
	req.Header.Set("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36")
	req.Header.Set("app-name", "xy")
	req.Header.Set("Content-Type", "application/json;charset=UTF-8")
	req.Header.Set("Accept", "application/json, text/plain, */*")
	req.Header.Set("device-id", "")
	req.Header.Set("os-type", "web")
	req.Header.Set("X-Authorization", "token:qgemv4jr1y38jyq6vhvi")
	req.Header.Set("Origin", "https://fanyi.caiyunapp.com")
	req.Header.Set("Sec-Fetch-Site", "cross-site")
	req.Header.Set("Sec-Fetch-Mode", "cors")
	req.Header.Set("Sec-Fetch-Dest", "empty")
	req.Header.Set("Referer", "https://fanyi.caiyunapp.com/")
	req.Header.Set("Accept-Language", "zh-CN,zh;q=0.9")
	req.Header.Set("Cookie", "_ym_uid=16456948721020430059; _ym_d=1645694872")
	resp, err := client.Do(req)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
	bodyText, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatal(err)
	}
	if resp.StatusCode != 200 {
		log.Fatal("bad StatusCode:", resp.StatusCode, "body", string(bodyText))
	}
	var dictResponse DictResponse
	err = json.Unmarshal(bodyText, &dictResponse)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(word, "UK:", dictResponse.Dictionary.Prons.En, "US:", dictResponse.Dictionary.Prons.EnUs)
	for _, item := range dictResponse.Dictionary.Explanations {
		fmt.Println(item)
	}
}

func query1(word string) {
	fmt.Println("query with youdao")
	client := &http.Client{}
	var data = strings.NewReader(`q=hello&from=Auto&to=Auto`)
	req, err := http.NewRequest("POST", "https://aidemo.youdao.com/trans", data)
	if err != nil {
		log.Fatal(err)
	}
	req.Header.Set("authority", "aidemo.youdao.com")
	req.Header.Set("accept", "application/json, text/javascript, */*; q=0.01")
	req.Header.Set("accept-language", "zh-CN,zh;q=0.9")
	req.Header.Set("content-type", "application/x-www-form-urlencoded; charset=UTF-8")
	req.Header.Set("origin", "https://ai.youdao.com")
	req.Header.Set("referer", "https://ai.youdao.com/")
	req.Header.Set("sec-ch-ua", `" Not A;Brand";v="99", "Chromium";v="101", "Google Chrome";v="101"`)
	req.Header.Set("sec-ch-ua-mobile", "?0")
	req.Header.Set("sec-ch-ua-platform", `"Windows"`)
	req.Header.Set("sec-fetch-dest", "empty")
	req.Header.Set("sec-fetch-mode", "cors")
	req.Header.Set("sec-fetch-site", "same-site")
	req.Header.Set("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.54 Safari/537.36")
	resp, err := client.Do(req)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
	bodyText, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatal(err)
	}
	if resp.StatusCode != 200 {
		log.Fatal("bad StatusCode:", resp.StatusCode, "body", string(bodyText))
	}
	var dictResponse DictResponse1
	err = json.Unmarshal(bodyText, &dictResponse)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(word)
	for _, item := range dictResponse.Basic.Explains {
		fmt.Println(item)
	}
}

func main() {
	if len(os.Args) != 2 {
		fmt.Fprintf(os.Stderr, `usage: simpleDict WORD
example: simpleDict hello
		`)
		os.Exit(1)
	}
	word := os.Args[1]
	var wg sync.WaitGroup
	wg.Add(2)
	go func() {
		defer wg.Done()
		query(word)
	}()
	go func() {
		defer wg.Done()
		query1(word)
	}()
	wg.Wait()
}