Golang从S3读取固定宽度文本文件

package main

import (
    "fmt"
    "io/ioutil"
    "strings"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/s3"
)

func main() {
    // 创建AWS会话
    sess, err := session.NewSession(&aws.Config{
        Region: aws.String("us-west-2"), // 设置S3存储桶所在的区域
    })
    if err != nil {
        fmt.Println("Failed to create session:", err)
        return
    }

    // 创建S3服务客户端
    svc := s3.New(sess)

    // 从S3读取文件内容
    result, err := svc.GetObject(&s3.GetObjectInput{
        Bucket: aws.String("my-bucket"), // 替换为实际的存储桶名称
        Key:    aws.String("file.txt"),  // 替换为实际的文件路径
    })
    if err != nil {
        fmt.Println("Failed to get object:", err)
        return
    }

    // 读取文件内容
    body, err := ioutil.ReadAll(result.Body)
    if err != nil {
        fmt.Println("Failed to read object:", err)
        return
    }

    // 解析固定宽度文本文件
    lines := strings.Split(string(body), "\n")
    for _, line := range lines {
        // 根据字段宽度解析每个字段的值
        field1 := line[0:10]
        field2 := line[10:20]
        field3 := line[20:30]

        // 打印字段值
        fmt.Println("Field 1:", field1)
        fmt.Println("Field 2:", field2)
        fmt.Println("Field 3:", field3)
    }
}