Golang的Json,Gob,Xml等文件的解析问题

直接上代码示例

package main

import (
	"bytes"
	"encoding/binary"
	"encoding/gob"
	"encoding/json"
	"encoding/xml"
	"fmt"
	"os"
)

type Website struct {
	Name string `xml:"name,attr"`
	Url string
	Course []string
}
//json 解析
func EncodeJson()  {
	info :=[]Website{
		{"Golang","https://c.biancheng.net",[]string{"https://c.biancheng.net/cplus","http://c.biancheng.net/linux"}},
		{"Java","http://c.biancheng.net/java",[]string{"https://c.biancheng.net/java1","http://c.biancheng.net/java2"}},
	}

	//创建文件
	filePtr ,err := os.Create("info.json")
	if err !=nil{
		fmt.Println("create file failed err: ",err)
		return
	}
	defer filePtr.Close()

	//创建json编码器
	encoder := json.NewEncoder(filePtr)
	err = encoder.Encode(info)
	if err !=nil{
		fmt.Println("encode failed err:",err)
		return
	}else{
		fmt.Println("encode success ...")
	}

}

func DecodeJson()  {
	filePtr,err := os.Open("info.json")
	if err !=nil{
		fmt.Println("open file failed err :",err)
		return
	}
	defer filePtr.Close()
	var info []Website
	decoder := json.NewDecoder(filePtr)
	err = decoder.Decode(&info)
	if err !=nil{
		fmt.Println("decoder file failed err :",err)
		return
	}else{
		fmt.Println("decoder file success...")
		fmt.Println(info)
	}
}


//xml
func EncodeXml(){
	info := []Website{
		{"Perl","http://perl.org.cn",[]string{"perl语言入门","Golang 语言入门"}},
	}

	file ,err := os.Create("info.xml")
	if err !=nil{
		fmt.Println("create file failed err :",err)
		return
	}
	defer file.Close()

	encoder := xml.NewEncoder(file)
	err = encoder.Encode(info)
	if err !=nil{
		fmt.Println("encode info failed err :",err)
		return
	}else{
		fmt.Println("encode info to file success...")
	}
}

func DecodeXml()  {
	file,err := os.Open("info.xml")
	if err !=nil{
		fmt.Println("open file failed err :",err)
		return
	}
	defer file.Close()
	var info []Website
	decoder := xml.NewDecoder(file)
	err = decoder.Decode(&info)
	if err !=nil{
		fmt.Println("decode file failed err :",err)
		return
	}else{
		fmt.Println("decode file success...")
		fmt.Println(info)
	}
}

func EncodeGob()  {
	info := map[string]string{
		"name":"test",
		"website":"https://web.com",
	}

	file,_ := os.OpenFile("demo.gob",os.O_CREATE|os.O_RDWR,0777)
	defer file.Close()
	encoder := gob.NewEncoder(file)
	if err :=encoder.Encode(info); err !=nil{
		fmt.Println(err)
	}
}

func DecodeGob()  {
	m1 := make(map[string]string)
	file,_ := os.Open("demo.gob")
	defer file.Close()
	decoder := gob.NewDecoder(file)
	if err := decoder.Decode(&m1);err !=nil{
		fmt.Println("decode failed err :",err)
		return
	}
	fmt.Println(m1)
}

//自定义二进制文件
type WebInfo struct {
	Url int32
}

func WriteBin()  {
	file,err := os.Create("outpath.bin")
	for i :=0;i<=10;i++{
		info := WebInfo{
			int32(i),
		}
		if err !=nil{
			fmt.Println("file create failed err :",err.Error())
			return
		}
		defer file.Close()

		var bin_buf bytes.Buffer
		binary.Write(&bin_buf,binary.LittleEndian,info)
		b := bin_buf.Bytes()
		_,err := file.Write(b)
		if err !=nil{
			fmt.Println("编码失败",err.Error())
			return
		}
	}
	fmt.Println("编码成功")
}

func ReadBin()  {
	file,err:= os.Open("outpath.bin")
	defer file.Close()
	if err != nil {
		fmt.Println("文件打开失败", err.Error())
		return
	}

	m := WebInfo{}
	for i :=0;i<=10;i++{
		data := readNextBytes(file,4)
		buffer := bytes.NewBuffer(data)
		err = binary.Read(buffer,binary.LittleEndian,&m)
		if err !=nil{
			fmt.Println("二进制文件读取失败，",err)
			return
		}
		fmt.Printf("第 %d 个值为:%v\n",i,m)
	}
}

func readNextBytes(file *os.File,num int) []byte {
	bytes := make([]byte,num)
	_,err := file.Read(bytes)
	if err !=nil{
		fmt.Println("解码失败",err)
	}
	return bytes
}

func main() {
	//EncodeJson()
	//DecodeJson()
	//EncodeXml()
	//DecodeXml()
	//EncodeGob()
	//DecodeGob()
	//WriteBin()
	ReadBin()
}