1.导出csv
go导出CSV中字符串带有英文逗号，只需要在字符串两端加上"\""
https://www.cnblogs.com/softidea/p/5313516.html
2.go 转json的问题
1、slice 的话需要&
var getOrderSlice []*TempOrder
err = json.Unmarshal([]byte(orderData), &getOrderSlice)
2、struct 的话不需要&
coun := &Guider{}
err = json.Unmarshal([]byte(nc), coun)
3.引入包需要引入的是文件夹名称而不是包名
rrdEsExport "git.twxrrd.com/wh.tech.rrd/daemon.jobs/model/wxrrd.ex.export"
不是
rrdEsExport "git.twxrrd.com/wh.tech.rrd/daemon.jobs/model/rrd_es_export"
package rrd_es_export
4.字符串拼接方法
1、+号拼接
func StringPlus() string{
var s string
s+="昵称"+":"+"飞雪无情"+"\n"
s+="博客"+":"+"http://www.flysnow.org/"+"\n"
s+="微信公众号"+":"+"flysnow_org"
return s
}
2、fmt 拼接
func StringFmt() string{
return fmt.Sprint("昵称",":","飞雪无情","\n","博客",":","http://www.flysnow.org/","\n","微信公众号",":","flysnow_org")
}
3、Join 拼接
func StringJoin() string{
s:=[]string{"昵称",":","飞雪无情","\n","博客",":","http://www.flysnow.org/","\n","微信公众号",":","flysnow_org"}
return strings.Join(s,"")
}
4、buffer 拼接
func StringBuffer() string {
var b bytes.Buffer
b.WriteString("昵称")
b.WriteString(":")
b.WriteString("飞雪无情")
b.WriteString("\n")
b.WriteString("博客")
b.WriteString(":")
b.WriteString("http://www.flysnow.org/")
b.WriteString("\n")
b.WriteString("微信公众号")
b.WriteString(":")
b.WriteString("flysnow_org")
return b.String()
}
5、builder 拼接
func StringBuilder() string {
var b strings.Builder
b.WriteString("昵称")
b.WriteString(":")
b.WriteString("飞雪无情")
b.WriteString("\n")
b.WriteString("博客")
b.WriteString(":")
b.WriteString("http://www.flysnow.org/")
b.WriteString("\n")
b.WriteString("微信公众号")
b.WriteString(":")
b.WriteString("flysnow_org")
return b.String()
}
str:="chinese"
city:="beijing"
// 1. +=
s:=time.Now()
for i:=0;i<100000;i++ {
str +=city
}
e:=time.Since(s)
fmt.Println("time cost 1:", e)
// 2. fmt.Sprintf
str="chinese"
city="beijing"
s=time.Now()
for i:=0;i<100000;i++ {
str = fmt.Sprintf("%s%s",str,city)
}
e=time.Since(s)
fmt.Println("time cost 2:", e)
//3. buffer.WriteString
str="chinese"
city="beijing"
s=time.Now()
var buf= bytes.Buffer{}
buf.WriteString(str)
for i:=0;i<100000;i++ {
buf.WriteString(city)
}
e=time.Since(s)
fmt.Println("time cost 3:", e)
//4. append
str="chinese"
city="beijing"
s=time.Now()
bstr:=[]byte(str)
bcity:=[]byte(city)
for i:=0;i<100000;i++ {
bstr= append(bstr, bcity...)
}
e=time.Since(s)
fmt.Println("time cost 4:", e)
// 5. copy
str="chinese"
city="beijing"
s=time.Now()
zstr :=[]byte(str)
for i:=0;i<100000;i++ {
copy(zstr, city)
}
e=time.Since(s)
fmt.Println("time cost 5:", e)
time cost 1: 3.176250251s
time cost 2: 5.347827717s
time cost 3: 1.051104ms
time cost 4: 769.258µs
time cost 5: 323.968µs
5. gin框架PostForm
1. 获取 Content-Type:application/x-www-form-urlencoded
接收参数
orderNo := c.PostForm("order_no")
post请求
## request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
func CurlPostStringData(stringData string, url string) ([]byte, error) {
//body := strings.NewReader("order_no=cjb&name=xiao")
body := strings.NewReader(stringData)
request, err := http.NewRequest("POST", url, body)
if err != nil {
log.WithChannel("curl post").Printf("url=%s,data=%s,http NewRequest error is %v", url, stringData, err)
return nil, err
}
request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
//使用连接池httpClient
httpClient := &http.Client{}
httpClient.Transport = &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
MaxIdleConnsPerHost: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 90 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
resp, err := httpClient.Do(request)
if err != nil {
log.WithChannel("curl post").Printf("url=%s,data=%s,client Do request error is %v", url, string(stringData), err)
return nil, err
}
respBytes, err := ioutil.ReadAll(resp.Body)
log.WithChannel("222").Printf("%s",string(respBytes))
if err != nil {
log.WithChannel("curl post").Printf("url=%s,data=%s,result ioutil ReadAll error is %v", url, string(stringData), err)
return nil, err
}
return respBytes, nil
}
2. 获取Content-Type:application/json;charset=UTF-8
接收参数
type TestS struct {
OrderNo string `json:"order_no"`
Name string `json:"name"`
}
func Register(c *gin.Context) {
body, _ := ioutil.ReadAll(c.Request.Body) //josn数据
test := &TestS{}
_=json.Unmarshal(body,test)
}
post请求
## request.Header.Set("Content-Type", "application/json;charset=UTF-8")
func CurlPost(byteData []byte, url string) ([]byte, error) {
//body := strings.NewReader("order_no=cjb&name=xiao")
body := bytes.NewReader(byteData)
request, err := http.NewRequest("POST", url, body)
if err != nil {
log.WithChannel("curl post").Printf("url=%s,data=%s,http NewRequest error is %v", url, string(byteData), err)
return nil, err
}
request.Header.Set("Content-Type", "application/json;charset=UTF-8")
//使用连接池httpClient
httpClient := &http.Client{}
httpClient.Transport = &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
MaxIdleConnsPerHost: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 90 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
resp, err := httpClient.Do(request)
if err != nil {
log.WithChannel("curl post").Printf("url=%s,data=%s,client Do request error is %v", url, string(byteData), err)
return nil, err
}
respBytes, err := ioutil.ReadAll(resp.Body)
log.WithChannel("222").Printf("%s",string(respBytes))
if err != nil {
log.WithChannel("curl post").Printf("url=%s,data=%s,result ioutil ReadAll error is %v", url, string(byteData), err)
return nil, err
}
return respBytes, nil
}
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