如何在Fabric -Gateway -Java中设置DISCOVERY_AS_LOCALHOST？我设置了环境变量，但它不起作用

import org.hyperledger.fabric.gateway.*;

Gateway.Builder builder = Gateway.createBuilder();

GatewayOptions.Builder gatewayOptionsBuilder = builder.getOptionsBuilder();
gatewayOptionsBuilder.discoveryOptions(DiscoveryOptions.create().asLocalhost());

// 设置网络连接选项
Path networkConfigPath = Paths.get("path/to/network/connection/profile.yaml");
gatewayOptionsBuilder.networkConfig(networkConfigPath);

// 设置身份验证选项
Path walletPath = Paths.get("path/to/wallet");
Wallet wallet = Wallets.newFileSystemWallet(walletPath);
IdentityProvider identityProvider = IdentityProvider.newDefaultIdentityProvider(wallet);
gatewayOptionsBuilder.identity(wallet, "user1").identityProvider(identityProvider);

try (Gateway gateway = builder.connect()) {
    // 连接到网络后执行你的操作
}