go基础库之有效地解析大型XML文件

<?xml version="1.0"?>
       <catalog>
         <book id="bk101">
           <author>Gambardella, Matthew</author>
           <title>XML Developer's Guide</title>
           <genre>Computer</genre>
           <price>44.95</price>
           <publish_date>2000-10-01</publish_date>
           <description>An in-depth look at creating applications 
            with XML.</description>
         </book>
         <book id="bk112">
           <author>Galos, Mike</author>
           <title>Visual Studio 7: A Comprehensive Guide</title>
           <genre>Computer</genre>
           <price>49.95</price>
           <publish_date>2001-04-16</publish_date>
           <description>Microsoft Visual Studio 7 is explored
            in depth, looking at how Visual Basic, Visual C++, C#,
            and ASP+ are integrated into a comprehensive development
            environment.</description>
         </book>
       </catalog>

package main

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

type Book struct {
	Title  string `xml:"title"`
	Author string `xml:"author"`
}

func main() {

	f, err := os.Open("data.xml")
	if err != nil {
		panic(err)
	}
	defer f.Close()
	decoder := xml.NewDecoder(f)

	// 逐一阅读本书
	books := make([]Book, 0)
	for {
		tok, _ := decoder.Token()
		if tok == nil {
			break
		}
		switch tp := tok.(type) {
		case xml.StartElement:
			if tp.Name.Local == "book" {
				// 将元素解码为struct
				var b Book
				decoder.DecodeElement(&b, &tp)
				books = append(books, b)
			}
		}
	}
	fmt.Println(books)
}

$ go run xml.go
[{XML Developer's Guide Gambardella, Matthew} {Visual Studio 7: A Comprehensive Guide Galos, Mike}]