Go 解析XML

king1076 · · 2998 次点击 · · 开始浏览    
这是一个创建于 的文章,其中的信息可能已经有所发展或是发生改变。

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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本文来自:CSDN博客

感谢作者:king1076

查看原文:Go 解析XML

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