[Java] - Google API调用

时间：2023-03-08 17:13:32

由于Google已经完成被墙，要上Google必需使用代理或VPN。

这里使用的是Google的*代理做开发。（如何使用*，这里不写了，忽略500字。。。。。）

本地测试的*地址为：127.0.0.1:8087

一、Google的API设置

1、首先需要在Google的控制台中设置新增好Project，设置地址：

https://console.developers.google.com

[Java] - Google API调用

2、在Permissions中设置好Service Account:

[Java] - Google API调用

3、在APIs & Auth -> APIs中，加入所需要开放的API，如本例中使用的是ShoppingContent：

[Java] - Google API调用

4、在APIs & Auth -> credential中生成或新增对应的键值或证书：

[Java] - Google API调用

我这里使用的是证书形式的调用，证书的生成在Public API access当中。点生成证书key后，会导出一个p12证书。保存好这个证书到项目当中。

二、获取Google HTTPS证书，并导入到Java JRE里头信认此证书

因为使用java访问google API是以https形式访问的，默认情况下，google的证书是不被信认的。所以需要先把google https的证书添加到java信认证书当中。

1、首先使用chrome打开这个地址：https://accounts.google.com

2、点击地址栏上的绿色锁：

[Java] - Google API调用

3、导出https证书保存成文件：

[Java] - Google API调用

比如说我这里保存的文件是：google.cer

4、eclipse安装插件：net.sourceforge.keytool.plugin_1.4.2.jar

插件哪里下载，自行搜索。在http://sourceforge.net/中可以下到。

如何安装eclipse插件这里忽略。

安装完后，可以在eclipse中看到：

工具栏：

[Java] - Google API调用

下面窗口：

[Java] - Google API调用

5、打开java的jdk证书文件，在eclipse中：

[Java] - Google API调用

弹出窗口：

[Java] - Google API调用

例如我本机的FileName中的位置是：C:\Program Files\Java\jdk1.7.0_51\jre\lib\security\cacerts

这里不要选错了，是JDK下的JRE下的lib，不要直接选到JRE下的lib。

默认密码为：changeit

打开后，将看到如下内容：

[Java] - Google API调用

6、导入证书。右键->Import certificate

[Java] - Google API调用

成功导入后将看到：

[Java] - Google API调用

三、编码

1、eclipse新建一个maven项目。（如何在eclipse新建maven项目这里忽略，使用maven是方便下载jar包，也可以自行上网搜索下载比较烦锁）

这里使用的是Google API的ShoppingContent做例子，所以下的Jar包为ShoppingContent，使用别的API，需要自行修改

pom.xml内容为：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.my.maven.googleapi</groupId>

  <artifactId>testapi</artifactId>

  <version>0.0.1-SNAPSHOT</version>

  <packaging>jar</packaging>

  <name>testapi</name>

  <url>http://maven.apache.org</url>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

  </properties>

  <dependencies>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>3.8.1</version>

      <scope>test</scope>

    </dependency>

    <dependency>

      <groupId>com.google.api-client</groupId>

      <artifactId>google-api-client</artifactId>

      <version>1.19.0</version>

    </dependency>

    <dependency>

        <groupId>com.google.http-client</groupId>

        <artifactId>google-http-client-jackson2</artifactId>

        <version>1.19.0</version>

    </dependency>

    <dependency>

      <groupId>com.google.apis</groupId>

      <artifactId>google-api-services-content</artifactId>

      <version>v2-rev33-1.19.1</version>

    </dependency>

  </dependencies>

</project>

下载完后的jar包大致会有这些：

[Java] - Google API调用

2、把p12证书文件也放到项目当中：

[Java] - Google API调用

3、Java测试类：

package com.my.maven.googleapi.testapi;

import java.io.File;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.Reader;

import java.math.BigInteger;

import java.net.URL;

import java.net.URLConnection;

import java.security.cert.X509Certificate;

import java.util.Collections;

import java.util.Properties;

import javax.net.ssl.HostnameVerifier;

import javax.net.ssl.HttpsURLConnection;

import javax.net.ssl.SSLContext;

import javax.net.ssl.SSLSession;

import javax.net.ssl.TrustManager;

import javax.net.ssl.X509TrustManager;

import com.google.api.client.auth.oauth2.Credential;

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;

import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;

import com.google.api.client.http.HttpRequest;

import com.google.api.client.http.HttpRequestInitializer;

import com.google.api.client.http.HttpTransport;

import com.google.api.client.http.javanet.NetHttpTransport;

import com.google.api.client.json.JsonFactory;

import com.google.api.client.json.jackson2.JacksonFactory;

import com.google.api.services.content.ShoppingContent;

import com.google.api.services.content.ShoppingContentScopes;

import com.google.api.services.content.model.Product;

/**

 * Hello world!

 *

 */

public class App {

    public static void main(String[] args) throws Exception {

        String strJavaHome = System.getProperty("java.home");

        Properties systemProperties = System.getProperties();

        systemProperties.setProperty("http.proxyHost", "127.0.0.1");

        systemProperties.setProperty("http.proxyPort", "8087");

        systemProperties.setProperty("https.proxyHost", "127.0.0.1");

        systemProperties.setProperty("https.proxyPort", "8087");

        systemProperties.setProperty("socksProxyHost", "127.0.0.1");

        systemProperties.setProperty("socksProxyPort", "8087");

        System.setProperty("sun.net.client.defaultConnectTimeout", String.valueOf(900000));// （单位：毫秒）

        final Credential credential = authorize();

        ShoppingContent service = new ShoppingContent.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)

                .setApplicationName(APPLICATION_NAME)

//                .setHttpRequestInitializer(new HttpRequestInitializer() {

//                    public void initialize(HttpRequest httpRequest) throws IOException {

//                        httpRequest.setReadTimeout(90000000);

//                        credential.initialize(httpRequest);

//                    }

//                })

                .build();

        Product product = service.products()

                .get(merchantId, "online:en:JP:123456789").execute();

        System.out.printf("%s %s\n", product.getId(), product.getTitle());

    }

    /**

     * Be sure to specify the name of your application. If the application name

     * is {@code null} or blank, the application will log a warning. Suggested

     * format is "MyCompany-ProductName/1.0".

     */

    private static final String APPLICATION_NAME = "AdWords.MerchantCenterProxy";

    /** Global instance of the HTTP transport. */

    private static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();

    /** Global instance of the JSON factory. */

    private static final JsonFactory JSON_FACTORY = new JacksonFactory();

    private static final String SERVICE_ACCOUNT_EMAIL = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX@developer.gserviceaccount.com";

    private static final String SERVICE_ACCOUNT_USER = "XXXXXXXXXXXXXXXXXXXX@gmail.com";

    private static final BigInteger merchantId = new BigInteger("123456789");

    /** Authorizes the installed application to access user's protected data. */

    private static Credential authorize() throws Exception {

        String p12FilePath = System.getProperty("user.dir") + "\\XXXXXXXXXX.p12";

        GoogleCredential credential = new GoogleCredential.Builder()

                .setTransport(HTTP_TRANSPORT)

                .setServiceAccountPrivateKeyFromP12File(new File(p12FilePath))

                .setJsonFactory(JSON_FACTORY)

                .setServiceAccountId(SERVICE_ACCOUNT_EMAIL)

                .setServiceAccountScopes(Collections.singleton(ShoppingContentScopes.CONTENT))

                .setServiceAccountUser(SERVICE_ACCOUNT_USER)

                .build();

        credential.refreshToken();

        return credential;

    }

}

代码说明：

注意到这一段：

        Properties systemProperties = System.getProperties();

        systemProperties.setProperty("http.proxyHost", "127.0.0.1");

        systemProperties.setProperty("http.proxyPort", "8087");

        systemProperties.setProperty("https.proxyHost", "127.0.0.1");

        systemProperties.setProperty("https.proxyPort", "8087");

        systemProperties.setProperty("socksProxyHost", "127.0.0.1");

        systemProperties.setProperty("socksProxyPort", "8087");

这是设置使用代理方式连接访问google。

这句：

        System.setProperty("sun.net.client.defaultConnectTimeout", String.valueOf(900000));// （单位：毫秒）

是指连接超时设置，当然了，也可以单独使用我已经注释的这段来做单个httprequest connection readtimeout设置：

//                .setHttpRequestInitializer(new HttpRequestInitializer() {

//                    public void initialize(HttpRequest httpRequest) throws IOException {

//                        httpRequest.setReadTimeout(90000000);

//                        credential.initialize(httpRequest);

//                    }

//                })

运行输出结果：

[Java] - Google API调用

最后附上.net的调用方法：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Google.GData.ContentForShopping;

using Google.GData.ContentForShopping.Elements;

using Google.GData.Client;

using Google.GData.Extensions;

using AdWords.Model;

using AdWords.Config;

using System.Xml;

using Google.Apis.Auth.OAuth2;

using Google.Apis.ShoppingContent.v2;

using System.Security.Cryptography.X509Certificates;

using Google.Apis.Services;

namespace AdWords.MerchantCenterProxy

{

    public class MerchantHelper

    {

        /// <summary>

        /// Merchant Account ID

        /// </summary>

        public static ulong MerchantCenterAccountId { get { return ulong.Parse(System.Configuration.ConfigurationManager.AppSettings["MerchantCenterAccountId"]); } }

        /// <summary>

        /// 登陆状态

        /// </summary>

        private static ServiceAccountCredential credential;

        /// <summary>

        /// 取得Google API OAuth2登陆状态

        /// </summary>

        /// <returns></returns>

        public static ServiceAccountCredential GetCredential()

        {

            if (credential == null)

            {

                String serviceAccountEmail = System.Configuration.ConfigurationManager.AppSettings["GoogleApiAccountEmail"];

                String certificateFilePath = System.Configuration.ConfigurationManager.AppSettings["GoogleApiCertificateFilePath"];

                String MerchantCenteruUser = System.Configuration.ConfigurationManager.AppSettings["MerchantCenterUserName"];

                var certificate = new X509Certificate2(certificateFilePath, "notasecret", X509KeyStorageFlags.Exportable);

                credential = new ServiceAccountCredential(

                   new ServiceAccountCredential.Initializer(serviceAccountEmail)

                   {

                       User = MerchantCenteruUser,

                       Scopes = new[] { ShoppingContentService.Scope.Content }

                   }.FromCertificate(certificate));

            }

            return credential;

        }

        /// <summary>

        /// 取得ShoppingContent Service

        /// </summary>

        /// <returns></returns>

        public static ShoppingContentService GenerateShoppingContentService()

        {

            var service = new ShoppingContentService(new BaseClientService.Initializer()

            {

                HttpClientInitializer = GetCredential(),

                ApplicationName = "AdWords.MerchantCenterProxy",

            });

            return service;

        }

    }

}

.net的Google API的dll下载，可以使用Package Manager Console中使用install命令下载得到。具体上网搜索一下即可。

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