今天看了看XML的解析，挺别致的和C++，Java之类的解析很是不同。
GO中将XMl的结构解析成一个数据结构，类似于一个结构体。
package main
import (
"encoding/xml"
"fmt"
"os"
)
type Address struct {
City, State string
}
type Person struct {
XMLName xml.Name `xml:"person"`
Id int `xml:"id,attr"`
FirstName string `xml:"name>first"`
LastName string `xml:"name>last"`
Age int `xml:"age"`
Height float32 `xml:"height,omitempty"`
Married bool
Address
Comment string `xml:",comment"`
}
func main() {
v := &Person{Id: 13, FirstName: "John", LastName: "Doe", Age: 42, Height: 172, Comment: " Need more details. "}
v.Address = Address{"Hanga Roa", "Easter Island"}
output, err := xml.MarshalIndent(v, " ", " ")
if err != nil {
fmt.Printf("error: %v\n", err)
}
os.Stdout.Write(output)
}
- the XMLName field, described above, is omitted. - a field with tag "-" is omitted. - a field with tag "name,attr" becomes an attribute with the given name in the XML element. - a field with tag ",attr" becomes an attribute with the field name in the XML element. - a field with tag ",chardata" is written as character data, not as an XML element. - a field with tag ",innerxml" is written verbatim, not subject to the usual marshalling procedure. - a field with tag ",comment" is written as an XML comment, not subject to the usual marshalling procedure. It must not contain the "--" string within it. - a field with a tag including the "omitempty" option is omitted if the field value is empty. The empty values are false, 0, any nil pointer or interface value, and any array, slice, map, or string of length zero. - an anonymous struct field is handled as if the fields of its value were part of the outer struct.
上面是关于 那个结构的构成。
下面的两个例子 是读取xml的
<person id="13"> <name> <first>John</first> <last>Doe</last> </name> <age>42</age> <height>172</height> <Married>false</Married> <City>Hanga Roa</City> <State>Easter Island</State> <!-- Need more details. --> </person>代码1：
package main
import (
"encoding/xml"
"fmt"
//"io"
"os"
)
type Address struct {
City, State string
}
type Person struct {
XMLName xml.Name `xml:"person"`
Id int `xml:"id,attr"`
FirstName string `xml:"name>first"`
LastName string `xml:"name>last"`
Age int `xml:"age"`
Height float32 `xml:"height,omitempty"`
Married bool
Address
Comment string `xml:",comment"`
}
func main() {
file, _ := os.Open("a.xml")
fileinfo, _ := file.Stat()
filesize := fileinfo.Size()
buffer := make([]byte, filesize)
file.Read(buffer)
fmt.Printf("%s", buffer)
person := Person{}
xml.Unmarshal(buffer, &person)
fmt.Println(person)
fmt.Println(person.FirstName)
fmt.Println(person.Age)
fmt.Println(person.City)
fmt.Println(person.LastName)
}
代码2：
package main
import (
"encoding/xml"
"fmt"
//"io"
"os"
)
type Address struct {
City, State string
}
type Person struct {
XMLName xml.Name `xml:"person"`
Id int `xml:"id,attr"`
FirstName string `xml:"name>first"`
LastName string `xml:"name>last"`
Age int `xml:"age"`
Height float32 `xml:"height,omitempty"`
Married bool
Address
Comment string `xml:",comment"`
}
func main() {
file, _ := os.Open("a.xml")
person := Person{}
decoder := xml.NewDecoder(file)
decoder.Decode(&person)
fmt.Println(person)
}
输出：
{{ person} 13 John Doe 42 172 false {Hanga Roa Easter Island} Need more details. }
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