在实际项目中，遇到将GB2312编码文件转为UTF8编码的文件，下面介绍使用iconv-go工具包来完成需求，当然，iconv-go还支持其他编码转换，如windows-1252，latin1，GBK（GB2312的扩展）等编码。
一、安装
安装的方法主要使用“go get”,支持默认路径$GOPATH/bin
go get github.com/djimenez/iconv-go
二、使用
使用的软件包，你需要适当的导入语句：
import (
iconv "github.com/djimenez/iconv-go"
)
三、转换字符串可以用两种方法完成
1、单次使用
func ConvertString(input string, fromEncoding string, toEncoding string) (output string, err error)
示例：
output,err:= iconv.ConvertString("Hello World!", "utf-8", “GB2312")
2、多次使用
converter := iconv.NewConverter("utf-8", "GB2312")
output,err := converter.ConvertString("Hello World!")
// converter can then be closed explicitly
// this will also happen when garbage collected
converter.Close()
四、转化[]byte数据
in := []byte("Hello World!")
out := make([]byte, len(input))
bytesRead, bytesWritten, err := iconv.Convert(in, out, "utf-8", "GB2312”)
当然也可以仿照字符串的使用方法多次使用
converter := iconv.NewConverter("utf-8", "GB2312")
bytesRead, bytesWritten, error := converter.Convert(input, output)
五、转化io.reader
// We're wrapping stdin for simplicity, but a File or network reader could
// be wrapped as well
reader,_ := iconv.NewReader(os.Stdin, "utf-8", "GB2312”)
六、转化io.writer
// We're wrapping stdout for simplicity, but a File or network reader could
// be wrapped as well
writer,_ := iconv.NewWriter(os.Stdout, "utf-8", “GB2312")
