本教程详细介绍如何使用Alibaba Cloud SDK for Java查询某专有网络VPC已创建的所有交换机。

前提条件

在使用本教程前，请确保已完成以下操作：
  • 使用Alibaba Cloud SDK for Java，您需要一个阿里云账号和访问密钥（AccessKey）。 请在阿里云控制台中的AccessKey管理页面上创建和查看您的AccessKey。
  • 确保您已经安装了Alibaba Cloud SDK for Java，准确的SDK版本号，请参见 阿里云开发工具包（SDK）。 
    <dependencies>
    <!-- https://mvnrepository.com/artifact/com.aliyun/aliyun-java-sdk-core -->
    <dependency>
        <groupId>com.aliyun</groupId>
        <artifactId>aliyun-java-sdk-core</artifactId>
        <version>4.4.5</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.aliyun/aliyun-java-sdk-vpc -->
    <dependency>
        <groupId>com.aliyun</groupId>
        <artifactId>aliyun-java-sdk-vpc</artifactId>
        <version>3.0.6</version>
    </dependency>
</dependencies>

代码示例

本文操作示例主要以代码形式体现，具体代码如下： 
import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.IAcsClient;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.exceptions.ServerException;
import com.aliyuncs.profile.DefaultProfile;
import com.aliyuncs.vpc.model.v20160428.DescribeVSwitchesRequest;
import com.aliyuncs.vpc.model.v20160428.DescribeVSwitchesResponse;
import com.aliyuncs.vpc.model.v20160428.DescribeVpcsRequest;
import com.aliyuncs.vpc.model.v20160428.DescribeVpcsResponse;
import com.google.gson.Gson;
import java.util.List;

/**
 * DescribeVpcs            查询已创建的VPC
 * DescribeVSwitches    查询已创建的交换机
 */
public class Demo{

    public static void main(String[] args) {
        IAcsClient client = initialization();
        // 获取到此地域下所有已创建的VPC列表
        List<DescribeVpcsResponse.Vpc> vpcList = describeVpcs(client);
        // 选择需要查询的vpcId
        String vpcId = "";
        // 根据用户情况结合前端来锁定需要的vpcId
        for (DescribeVpcsResponse.Vpc vpc : vpcList) {
            vpcId = vpc.getVpcId();
            if (vpcId != "" || vpcId != null) {
                break;
            }
        }
        describeVSwitches(client, vpcId);
    }

    /**
     * DescribeVSwitches    查询某VPC的交换机
     */
    private static void describeVSwitches(IAcsClient client, String vpcId) {
        DescribeVSwitchesRequest request = new DescribeVSwitchesRequest();
        // 是否查询指定地域下的默认交换机，取值：
        //
        // true（默认值）：查询指定地域下的所有交换机
        // false：不查询默认交换机
        // request.setIsDefault(true);
        // VPC的ID
        request.setVpcId(vpcId);
        try {
            DescribeVSwitchesResponse response = client.getAcsResponse(request);
            // 打印返回信息
            System.out.println("------------------describeVSwitches-------------------");
            System.out.println(new Gson().toJson(response));
        } catch (ServerException e) {
            e.printStackTrace();
        } catch (ClientException e) {
            System.out.println("ErrCode:" + e.getErrCode());
            System.out.println("ErrMsg:" + e.getErrMsg());
            System.out.println("RequestId:" + e.getRequestId());
        }
    }

    /**
     * DescribeVpcs       查询已创建的VPC
     */
    private static List<DescribeVpcsResponse.Vpc> describeVpcs(IAcsClient client) {
        DescribeVpcsRequest request = new DescribeVpcsRequest();
        // 是否查询指定地域下的默认VPC，取值：
        //
        // true（默认值）：查询指定地域下的所有VPC
        // false：不查询默认VPC
        // request.setIsDefault();
        try {
            DescribeVpcsResponse response = client.getAcsResponse(request);
            System.out.println("------------------describeVpcs-------------------");
            // 打印返回信息
            System.out.println(new Gson().toJson(response));
            return response.getVpcs();
        } catch (ClientException e) {
            System.out.println("ErrCode:" + e.getErrCode());
            System.out.println("ErrMsg:" + e.getErrMsg());
            System.out.println("RequestId:" + e.getRequestId());
            throw new RuntimeException(e);
        }
    }

    /**
     * Initialization  初始化公共请求参数
     */
    private static IAcsClient initialization() {
        // 初始化请求参数
        DefaultProfile profile = DefaultProfile.getProfile(
                "<your-region-id>", // 您的可用区ID
                "<your-access-key-id>", // 您的AccessKey ID
                "<your-access-key-secret>"); // 您的AccessKey Secret
        return new DefaultAcsClient(profile);
    }
}

执行结果

正确的执行结果类似如下： 
------------------describeVpcs-------------------
{
    "requestId": "06764483-D2D0-4443-B515-0CC92CCDEDB9", 
    "totalCount": 21, 
    "pageNumber": 1, 
    "pageSize": 10, 
    "vpcs": [
        {
            "vpcId": "vpc-bp1t36rn9*****", 
            "regionId": "cn-hangzhou", 
            "status": "Available", 
            "vpcName": "lalalala", 
            "creationTime": "2019-08-14T07:52:28Z", 
            "cidrBlock": "172.16.0.0/12", 
            "ipv6CidrBlock": "", 
            "vRouterId": "vrt-bp1kekr32*****", 
            "description": "", 
            "isDefault": false, 
            "resourceGroupId": "rg-acfm*****", 
            "tags": [ ], 
            "vSwitchIds": [], 
            "userCidrs": [ ], 
            "natGatewayIds": [ ], 
            "routerTableIds": []
        }, 
        {
            "vpcId": "vpc-bp1m7v25emi*****", 
            "regionId": "cn-hangzhou", 
            "status": "Available", 
            "vpcName": "hello", 
            "creationTime": "2019-04-08T00:05:29Z", 
            "cidrBlock": "192.168.0.0/16", 
            "ipv6CidrBlock": "", 
            "vRouterId": "vrt-bp1fwrrlhoa8*****", 
            "description": "", 
            "isDefault": false, 
            "resourceGroupId": "rg-acfmxaz*****", 
            "tags": [ ], 
            "vSwitchIds": [], 
            "userCidrs": [ ], 
            "natGatewayIds": [], 
            "routerTableIds": []
        }
    ]
}
------------------describeVSwitches-------------------
{
    "requestId": "7C053A65-2CD0-4C66-BD94-00F6B0E7AE17", 
    "totalCount": 1, 
    "pageNumber": 1, 
    "pageSize": 10, 
    "vSwitches": [
        {
            "vSwitchId": "vsw-bp1ug2f2vp*****", 
            "vpcId": "vpc-bp1t36r*****", 
            "status": "Available", 
            "cidrBlock": "172.16.0.0/24", 
            "ipv6CidrBlock": "", 
            "zoneId": "cn-hangzhou-b", 
            "availableIpAddressCount": 250, 
            "description": "", 
            "vSwitchName": "lalalala", 
            "creationTime": "2019-08-14T07:52:31Z", 
            "isDefault": false, 
            "resourceGroupId": "rg-acfmx*****", 
            "tags": [ ], 
            "routeTable": {
                "routeTableId": "vtb-bp1r9p*****", 
                "routeTableType": "System"
            }
        }
    ]
}