Go 解析XML

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: %vn",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,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.

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>

package main

import (
	"encoding/xml"
	"fmt"
	//"io"
	"os"
)

type Address struct {
	City,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)
}

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)
}

{{ person} 13 John Doe 42 172 false {Hanga Roa Easter Island}  Need more details. }

（编辑：李大同）

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