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GoAgent代理做开发。（如何使用GoAgent，这里不写了，忽略500字。。。。。）
本地测试的GoAgent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
2、在Permissions中设置好Service Account:
3、在APIs & Auth -> APIs中，加入所需要开放的API，如本例中使用的是ShoppingContent：
4、在APIs & Auth -> credential中生成或新增对应的键值或证书：
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：
3、导出https证书保存成文件：
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：
下面窗口：
5、打开java的jdk证书文件，在eclipse中：
弹出窗口：
例如我本机的FileName中的位置是：C:Program FilesJavajdk1.7.0_51jrelibsecuritycacerts
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：
6、导入证书。右键->Import certificate
成功导入后将看到：
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：
2、把p12证书文件也放到项目当中：
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 ", 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：
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。