模板渲染终端
1）替换 {{.字段名}}
demo.go
package main
import (
"fmt"
"os"
"text/template"
)
type Person struct {
Name string
age string
}
func main() {
t,err := template.ParseFiles("e:/golang/go_pro/src/safly/index.html")
if err != nil {
fmt.Println("parse file err:",err)
return
}
p := Person{Name: "Mary",age: "31"}
if err := t.Execute(os.Stdout,p); err != nil {
fmt.Println("There was an error:",err.Error())
}
}
index.html
<html> <head> <title> </title> </head> <body> <p> <!--p代表当前对象--> hello,{{.Name}} {{.}} </p> </body> </html>
然后在终端就可以渲染输出如下：
PS E:\golang\go_pro\src\safly> go run demo.go
<html>
<head>
<title>
</title>
</head>
<body>
<p>
<!--p代表当前对象-->
hello,Mary
{Mary 31}
</p>
</body>
</html>
PS E:\golang\go_pro\src\safly>
模板渲染浏览器输出
index.html保持不变
package main
import (
"fmt"
"html/template"
// "io"
"net/http"
)
var myTemplate *template.Template
type Person struct {
Name string
age string
}
func userInfo(w http.ResponseWriter,r *http.Request) {
p := Person{Name:"safly",age:"30"}
myTemplate.Execute(w,p)
}
func initTemplate(fileName string) (err error){
myTemplate,err = template.ParseFiles(fileName)
if err != nil{
fmt.Println("parse file err:",err)
return
}
return
}
/* func HandleFunc(pattern string,handler func(ResponseWriter,*Request)) { DefaultServeMux.HandleFunc(pattern,handler) } */
func main() {
initTemplate("e:/golang/go_pro/src/safly/index.html")
http.HandleFunc("/user/info",userInfo)
err := http.ListenAndServe("0.0.0.0:8880",nil)
if err != nil {
fmt.Println("http listen Failed")
}
}
模板渲染存储文件
package main
import (
"os"
"fmt"
"html/template"
// "io"
"net/http"
)
var myTemplate *template.Template
type Person struct {
Name string
age string
}
func userInfo(w http.ResponseWriter,age:"30"}
myTemplate.Execute(os.Stdout,p)
file,err := os.OpenFile("demo.dat",os.O_CREATE|os.O_WRONLY, 0755)
if err != nil {
fmt.Println("open Failed err:",err)
return
}
myTemplate.Execute(file,p)
}
func initTemplate(fileName string) (err error){
myTemplate,nil)
if err != nil {
fmt.Println("http listen Failed")
}
}
自定义io.Writer渲染
我们看下myTemplate.Execute源码
func (t *Template) Execute(wr io.Writer,data interface{}) error {
if err := t.escape(); err != nil {
return err
}
return t.text.Execute(wr,data)
}
type Writer interface { Write(p []byte) (n int,err error) }
package main
import (
// "os"
"fmt"
"html/template"
"io"
"net/http"
)
var myTemplate *template.Template
type Person struct {
Name string
age string
}
type Result struct {
output string
}
/* 自定义实现接口 type Writer interface { Write(p []byte) (n int,err error) } */
func (p *Result) Write(b []byte) (n int,err error) {
fmt.Println("called by template")
p.output += string(b)
return len(b),nil
}
/* func WriteString(w Writer,s string) (n int,err error) { if sw,ok := w.(stringWriter); ok { return sw.WriteString(s) } return w.Write([]byte(s)) } */
func userInfo(w http.ResponseWriter,r *http.Request) {
p := Person{Name:"safly",age:"30"}
resultWriter := &Result{}
io.WriteString(resultWriter,"hello world")
myTemplate.Execute(resultWriter,p)
fmt.Println("render data:",resultWriter.output)
}
func initTemplate(fileName string) (err error){
myTemplate,nil)
if err != nil {
fmt.Println("http listen Failed")
}
}
我们在浏览器中输入http://localhost:8880/user/info
然后在终端就会渲染出如下内容：
PS E:\golang\go_pro\src\safly> go run demo.go
called by template
called by template
called by template
called by template
called by template
called by template
render data: hello world<html>
<head>
<title>
</title>
</head>
<body>
<p>
hello,safly
{safly 30}
</p>
</body>
</html>