package cube

import (
    "encoding/json"
    "fmt"
    "github.com/magiconair/properties/assert"
    "k8s.io/api/rbac/v1beta1"
    v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "testing"
)

func TestRole(t *testing.T)  {
    clusterRoleBind := &v1beta1.ClusterRoleBinding{
        ObjectMeta: v1.ObjectMeta{
            Name: "serviceaccounts-cluster-admin",
        },
        RoleRef: v1beta1.RoleRef{
            APIGroup: "rbac.authorization.k8s.io",
            Kind:     "ClusterRole",
            Name:     "cluster-admin",
        },
        Subjects: []v1beta1.Subject{{
            Kind:     "Group",
            APIGroup: "rbac.authorization.k8s.io",
            Name:     "system:serviceaccounts",
        },
        },
    }
    b, err := json.MarshalIndent(clusterRoleBind, "", "  ")
    assert.Equal(t, nil, err)
    fmt.Println(string(b))
}

为了更好地使用内存，我想这样更好:

var out io.Writer
enc := json.NewEncoder(out)
enc.SetIndent("", "    ")
if err := enc.Encode(data); err != nil {
    panic(err)
}

如果你想创建一个命令行工具来漂亮地打印JSON

package main

import ("fmt"
  "encoding/json"
  "os"
  "bufio"
  "bytes"
)


func main(){

    var out bytes.Buffer

    reader := bufio.NewReader(os.Stdin)
    text, _ := reader.ReadString('\n')

    err := json.Indent(&out, []byte(text), "", "  ")
    if err != nil {
      fmt.Println(err)
    }

    fmt.Println(string(out.Bytes()))
}

echo "{\"boo\":\"moo\"}" | go run main.go 

将产生以下输出:

{
  "boo": "moo"
}

请随意构建二进制文件

go build main.go

然后把它放到/usr/local/bin中

一个简单的货架上漂亮的打印机。可以通过以下方法将其编译为二进制文件:

go build -o jsonformat jsonformat.go

它从标准输入读取，写入标准输出，并允许设置缩进:

package main

import (
    "bytes"
    "encoding/json"
    "flag"
    "fmt"
    "io/ioutil"
    "os"
)

func main() {
    indent := flag.String("indent", "  ", "indentation string/character for formatter")
    flag.Parse()
    src, err := ioutil.ReadAll(os.Stdin)
    if err != nil {
        fmt.Fprintf(os.Stderr, "problem reading: %s", err)
        os.Exit(1)
    }

    dst := &bytes.Buffer{}
    if err := json.Indent(dst, src, "", *indent); err != nil {
        fmt.Fprintf(os.Stderr, "problem formatting: %s", err)
        os.Exit(1)
    }
    if _, err = dst.WriteTo(os.Stdout); err != nil {
        fmt.Fprintf(os.Stderr, "problem writing: %s", err)
        os.Exit(1)
    }
}

它允许运行bash命令，如:

cat myfile | jsonformat | grep "key"

这是我用的。如果它不能漂亮地打印JSON，它只返回原始字符串。用于打印应该包含JSON的HTTP响应。

import (
    "encoding/json"
    "bytes"
)

func jsonPrettyPrint(in string) string {
    var out bytes.Buffer
    err := json.Indent(&out, []byte(in), "", "\t")
    if err != nil {
        return in
    }
    return out.String()
}

回头看，这是非惯用的围棋。像这样的小助手函数增加了额外的复杂性。一般来说，围棋哲学倾向于包含3条简单的线，而不是1条棘手的线。

正如@robyoder提到的，json。缩进才是正确的选择。我想添加这个小的prettyprint函数:

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
)

//dont do this, see above edit
func prettyprint(b []byte) ([]byte, error) {
    var out bytes.Buffer
    err := json.Indent(&out, b, "", "  ")
    return out.Bytes(), err
}

func main() {
    b := []byte(`{"hello": "123"}`)
    b, _ = prettyprint(b)
    fmt.Printf("%s", b)
}

https://go-sandbox.com/#/R4LWpkkHIN或http://play.golang.org/p/R4LWpkkHIN