要通过APIM 2.6.0的Rest APIs安装SSL证书，您可以按照以下步骤进行操作：

1. 获取SSL证书的内容和私钥。您可以将证书和私钥保存为PEM格式的文件，或者将其作为字符串提供。

2. 使用APIM管理器的OAuth 2.0令牌端点获取访问令牌。您需要提供适当的用户名和密码。

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class AccessTokenRetriever {
    public static void main(String[] args) {
        String tokenEndpoint = "https:///oauth2/token";
        String username = "";
        String password = "";
        
        String token = retrieveAccessToken(tokenEndpoint, username, password);
        System.out.println("Access Token: " + token);
    }
    
    private static String retrieveAccessToken(String tokenEndpoint, String username, String password) {
        try {
            URL url = new URL(tokenEndpoint + "?grant_type=password&username=" + username + "&password=" + password);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            StringBuilder response = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();
            
            // Extract access token from the response
            String accessToken = response.toString().split("\"access_token\":\"")[1].split("\"")[0];
            
            return accessToken;
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return null;
    }
}

3. 使用获取到的访问令牌调用APIM管理器的API来安装SSL证书。您需要提供相应的API网关的URL和API标识符。

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class SSLCertificateInstaller {
    public static void main(String[] args) {
        String apiGatewayUrl = "https:///api/am/publisher/v1.0";
        String apiId = "";
        String accessToken = "";
        String certificateContent = ""; // Certificate content in PEM format
        String privateKey = ""; // Private key in PEM format
        
        installSSLCertificate(apiGatewayUrl, apiId, accessToken, certificateContent, privateKey);
    }
    
    private static void installSSLCertificate(String apiGatewayUrl, String apiId, String accessToken,
                                              String certificateContent, String privateKey) {
        try {
            URL url = new URL(apiGatewayUrl + "/apis/" + apiId + "/endpoint.certificates");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Authorization", "Bearer " + accessToken);
            connection.setRequestProperty("Content-Type", "application/json");
            
            String payload = "{\n" +
                    "  \"certificate\": {\n" +
                    "    \"type\": \"PEM\",\n" +
                    "    \"content\": \"" + certificateContent + "\",\n" +
                    "    \"privateKey\": \"" + privateKey + "\"\n" +
                    "  }\n" +
                    "}";
            
            connection.setDoOutput(true);
            DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
            outputStream.writeBytes(payload);
            outputStream.flush();
            outputStream.close();
            
            int responseCode = connection.getResponseCode();
            System.out.println("Response Code: " + responseCode);
            
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            StringBuilder response = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();
            
            System.out.println("Response: " + response.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

请将上述代码中的占位符替换为实际的值：

• ：您的APIM主机名或IP地址。
• 和：用于获取访问令牌的用户名和密码。
• ：要安装SSL证书的API的标识符。
• ：SSL证书的内容（PEM格式）。
• ：SSL证书的私钥（PEM格式）。
• ：