发现支持的语言（基本版）

本文档介绍了如何使用 Cloud Translation API (v2) 列出支持的语言。

准备工作

在开始使用 Cloud Translation API 之前，您必须有一个启用了 Cloud Translation API 的项目，以及相应的凭据。您还可以安装常用编程语言的客户端库，以便调用 API。

如需了解详情，请参阅设置页面。

发送支持的语言请求

您可以通过使用以下格式的网址发送 HTTP 请求来发现此 API 支持的语言：

https://translation.googleapis.com/language/translate/v2/languages

获取支持的语言列表

REST 和命令行

如需获取所有支持的语言列表，请向 https://translation.googleapis.com/language/translate/v2/languages 端点发出 GET 请求。下面显示了使用 curl 和 PowerShell 的 GET 请求的示例。该示例使用通过 Google Cloud Cloud SDK 为项目设置的服务帐号的访问令牌。如需了解有关安装 Cloud SDK、使用服务帐号设置项目以及获取访问令牌的说明，请参阅设置页面。

HTTP 方法和网址：

GET https://translation.googleapis.com/language/translate/v2/languages

如需发送请求，请选择以下方式之一：

curl

执行以下命令：

curl -X GET \
-H "Authorization: Bearer "$(gcloud auth application-default print-access-token) \
https://translation.googleapis.com/language/translate/v2/languages

PowerShell

执行以下命令：

$cred = gcloud auth application-default print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `
  -Method GET `
  -Headers $headers `
  -Uri "https://translation.googleapis.com/language/translate/v2/languages
" | Select-Object -Expand Content

您应该收到类似以下内容的 JSON 响应：

{
  "languages": [
    {
      "language": "en"
    },
    {
      "language": "fr"
    },
    {
      "language": "zh-CN"
    }
  ]
}

此查询会返回受支持语言的 ISO-639-1 语言代码。一些语言代码还包含国家/地区代码（如 zh-CN 或 zh-TW）。该列表按照语言代码的字母顺序排列。由于空间限制，上述示例已被缩短。

C#


using Google.Cloud.Translation.V2;
using System;
using System.Collections.Generic;

public partial class TranslateSample
{
    public IList<Language> ListLanguageCodes()
    {
        TranslationClient client = TranslationClient.Create();
        IList<Language> response = client.ListLanguages();
        foreach (var language in response)
        {
            Console.WriteLine(language.Code);
        }
        return response;
    }
}

Go

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/translate"
	"golang.org/x/text/language"
)

func listSupportedLanguages(w io.Writer, targetLanguage string) error {
	// targetLanguage := "th"
	ctx := context.Background()

	lang, err := language.Parse(targetLanguage)
	if err != nil {
		return fmt.Errorf("language.Parse: %v", err)
	}

	client, err := translate.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("translate.NewClient: %v", err)
	}
	defer client.Close()

	langs, err := client.SupportedLanguages(ctx, lang)
	if err != nil {
		return fmt.Errorf("SupportedLanguages: %v", err)
	}

	for _, lang := range langs {
		fmt.Fprintf(w, "%q: %s\n", lang.Tag, lang.Name)
	}

	return nil
}

Java

// TODO(developer): Uncomment these lines.
// import com.google.cloud.translate.*;
// Translate translate = TranslateOptions.getDefaultInstance().getService();

List<Language> languages = translate.listSupportedLanguages();

for (Language language : languages) {
  System.out.printf("Name: %s, Code: %s\n", language.getName(), language.getCode());
}

Node.js

// Imports the Google Cloud client library
const {Translate} = require('@google-cloud/translate').v2;

// Creates a client
const translate = new Translate();

async function listLanguages() {
  // Lists available translation language with their names in English (the default).
  const [languages] = await translate.getLanguages();

  console.log('Languages:');
  languages.forEach(language => console.log(language));
}

listLanguages();

PHP

use Google\Cloud\Translate\TranslateClient;

$translate = new TranslateClient();
foreach ($translate->languages() as $code) {
    print("$code\n");
}

Python

"""Lists all available languages."""
from google.cloud import translate_v2 as translate

translate_client = translate.Client()

results = translate_client.get_languages()

for language in results:
    print(u"{name} ({language})".format(**language))

Ruby

# project_id = "Your Google Cloud project ID"

require "google/cloud/translate"

translate = Google::Cloud::Translate.translation_v2_service project_id: project_id
languages = translate.languages

puts "Supported language codes:"
languages.each do |language|
  puts language.code
end

使用目标语言列出支持的语言

REST 和命令行

下面是返回受支持语言列表的另一个示例。返回的语言名称是用指定的目标语言编写的。返回的列表按照目标语言的字母顺序排列。

如需列出目标语言支持的语言，请发出 POST 请求并在请求正文中提供用于标识目标语言的 JSON 代码。下面显示了使用 curl 或 PowerShell 的 POST 请求的示例。

HTTP 方法和网址：

POST https://translation.googleapis.com/language/translate/v2/languages

请求 JSON 正文： 

{
    "target": "zh-TW"
}

如需发送请求，请选择以下方式之一：

curl

将请求正文保存在名为 request.json 的文件中，然后执行以下命令： 

curl -X POST \
-H "Authorization: Bearer "$(gcloud auth application-default print-access-token) \
-H "Content-Type: application/json; charset=utf-8" \
-d @request.json \
https://translation.googleapis.com/language/translate/v2/languages

PowerShell

将请求正文保存在名为 request.json 的文件中，然后执行以下命令： 

$cred = gcloud auth application-default print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `
  -Method POST `
  -Headers $headers `
  -ContentType: "application/json; charset=utf-8" `
  -InFile request.json `
  -Uri "https://translation.googleapis.com/language/translate/v2/languages
" | Select-Object -Expand Content

您应该收到类似以下内容的 JSON 响应：

{
  "data": {
    "languages": [
      {
        "language": "zh-CN",
        "name": "中文(簡體)"
      },
      {
        "language": "fr",
        "name": "法文"
      },
      {
        "language": "en",
        "name": "英文"
      }
    ]
  }
}

在这种情况下，查询会返回与上文相同的语言代码，以及 name 字符串，该字符串提供了使用目标语言 zh-TW 写出的语言的名称。由于空间限制，上述示例已被缩短。

C#


using Google.Cloud.Translation.V2;
using System;
using System.Collections.Generic;

public partial class TranslateSample
{
    public IList<Language> ListLanguageNames()
    {
        TranslationClient client = TranslationClient.Create();
        // List all the languages in English.
        IList<Language> languages = client.ListLanguages(target: "en");
        foreach (var language in languages)
        {
            Console.WriteLine($"{language.Code}\t{language.Name}");
        }
        return languages;
    }
}

Go

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/translate"
	"golang.org/x/text/language"
)

func listSupportedLanguages(w io.Writer, targetLanguage string) error {
	// targetLanguage := "th"
	ctx := context.Background()

	lang, err := language.Parse(targetLanguage)
	if err != nil {
		return fmt.Errorf("language.Parse: %v", err)
	}

	client, err := translate.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("translate.NewClient: %v", err)
	}
	defer client.Close()

	langs, err := client.SupportedLanguages(ctx, lang)
	if err != nil {
		return fmt.Errorf("SupportedLanguages: %v", err)
	}

	for _, lang := range langs {
		fmt.Fprintf(w, "%q: %s\n", lang.Tag, lang.Name)
	}

	return nil
}

Java

// TODO(developer): Uncomment these lines.
// import com.google.cloud.translate.*;
// Translate translate = TranslateOptions.getDefaultInstance().getService();

List<Language> languages =
    translate.listSupportedLanguages(Translate.LanguageListOption.targetLanguage("es"));

for (Language language : languages) {
  System.out.printf("Name: %s, Code: %s\n", language.getName(), language.getCode());
}

Node.js

// Imports the Google Cloud client library
const {Translate} = require('@google-cloud/translate').v2;

// Creates a client
const translate = new Translate();

/**
 * TODO(developer): Uncomment the following line before running the sample.
 */
// const target = 'The target language for language names, e.g. ru';

async function listLanguagesWithTarget() {
  // Lists available translation language with their names in a target language
  const [languages] = await translate.getLanguages(target);

  console.log('Languages:');
  languages.forEach(language => console.log(language));
}

listLanguagesWithTarget();

PHP

use Google\Cloud\Translate\TranslateClient;

/** Uncomment and populate these variables in your code */
// $targetLanguage = 'en'; // Language to print the language names in

$translate = new TranslateClient();
$result = $translate->localizedLanguages([
    'target' => $targetLanguage,
]);
foreach ($result as $lang) {
    printf('%s: %s' . PHP_EOL, $lang['code'], $lang['name']);
}

Python

"""Lists all available languages and localizes them to the target language.

Target must be an ISO 639-1 language code.
See https://g.co/cloud/translate/v2/translate-reference#supported_languages
"""
from google.cloud import translate_v2 as translate

translate_client = translate.Client()

results = translate_client.get_languages(target_language=target)

for language in results:
    print(u"{name} ({language})".format(**language))

Ruby

# project_id = "Your Google Cloud project ID"

# To receive the names of the supported languages, provide the code
# for the language in which you wish to receive the names
# language_code = "en"

require "google/cloud/translate"

translate = Google::Cloud::Translate.translation_v2_service project_id: project_id
languages = translate.languages language_code

puts "Supported languages:"
languages.each do |language|
  puts "#{language.code} #{language.name}"
end