最近接了一个项目，需要访问工业的实时数据库，数据库的对外开放接口是OPCUA协议的，经过多方比对，发现github上milo的评星较高，尝试了一下，还比较方便好用，现在把使用过程中的坑和大家介绍一下，网上比较全的资料不多，下面是整个过程全部的资料：
本次采用KEPServerEX5模拟服务端，使用milo开发的程序作为客户端
一、搭建服务端，KEPServerEX5的安装省略掉，下面是配置过程
设置通道、设备、标签
设置访问的用户名和密码
设置通过opc-ua访问的节点
二、使用milo的框架，开发客户端访问opcua服务
1、在pom文件中追击以下依赖
<!--start milo-->
<dependency>
<groupId>org.eclipse.milo</groupId>
<artifactId>sdk-client</artifactId>
<version>0.2.4</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcpkix-jdk15on</artifactId>
<version>1.57</version>
</dependency>
<dependency>
<groupId>org.eclipse.milo</groupId>
<artifactId>sdk-server</artifactId>
<version>0.2.4</version>
</dependency>
<!--end milo-->
2、OPC UA协议对象接口
package com.jndj.platform.common.milo;
import org.eclipse.milo.opcua.sdk.client.OpcUaClient;
import org.eclipse.milo.opcua.sdk.client.api.identity.AnonymousProvider;
import org.eclipse.milo.opcua.sdk.client.api.identity.IdentityProvider;
import org.eclipse.milo.opcua.stack.core.security.SecurityPolicy;
import org.eclipse.milo.opcua.stack.core.types.structured.EndpointDescription;
import java.util.concurrent.CompletableFuture;
import java.util.function.Predicate;
public interface OpcUAClientService {
default String getEndpointUrl() {
return "opc.tcp://127.0.0.1:49320";
}
default Predicate<EndpointDescription> endpointFilter() {
return e -> true;
}
default SecurityPolicy getSecurityPolicy() {
return SecurityPolicy.None;
}
default IdentityProvider getIdentityProvider() {
return new AnonymousProvider();
}
void run(OpcUaClient client, CompletableFuture<OpcUaClient> future) throws Exception;
}
3、OPC UA协议对象实体类
package com.jndj.platform.common.milo;
import com.google.common.collect.ImmutableList;
import org.eclipse.milo.opcua.sdk.client.OpcUaClient;
import org.eclipse.milo.opcua.stack.core.types.builtin.*;
import org.eclipse.milo.opcua.stack.core.types.enumerated.TimestampsToReturn;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.concurrent.CompletableFuture;
@Service("OpcUAClientService")
public class OpcUAClientServiceImpl implements OpcUAClientService {
@Override
public void run(OpcUaClient client, CompletableFuture<OpcUaClient> future) throws Exception {
// 同步建立连接
client.connect().get();
// 异步读取数据
readTagData(client).thenAccept(values -> {
DataValue nodeId_Tag1 = values.get(0);
DataValue nodeId_Tag2 = values.get(1);
System.out.println("#########Tag1=" + nodeId_Tag1.getValue().getValue());
System.out.println("#########Tag2=" + nodeId_Tag2.getValue().getValue());
future.complete(client);
});
}
private CompletableFuture<List<DataValue>> readTagData(OpcUaClient client) {
NodeId nodeId_Tag1 = new NodeId(2, "Channel1.Device1.Tag1");
NodeId nodeId_Tag2 = new NodeId(2, "Channel1.Device1.Tag2");
List<NodeId> nodeIds = ImmutableList.of(nodeId_Tag1, nodeId_Tag2);
return client.readValues(0.0, TimestampsToReturn.Both, nodeIds);
}
}
4、OPC UA协议运行对象
package com.jndj.platform.common.milo;
import org.eclipse.milo.opcua.sdk.client.OpcUaClient;
import org.eclipse.milo.opcua.sdk.client.api.config.OpcUaClientConfig;
import org.eclipse.milo.opcua.sdk.client.api.identity.UsernameProvider;
import org.eclipse.milo.opcua.stack.client.UaTcpStackClient;
import org.eclipse.milo.opcua.stack.core.Stack;
import org.eclipse.milo.opcua.stack.core.types.builtin.LocalizedText;
import org.eclipse.milo.opcua.stack.core.types.structured.EndpointDescription;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import static org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.Unsigned.uint;
@Service("OpcUAClientRunner")
public class OpcUAClientRunner {
private final Logger logger = LoggerFactory.getLogger(getClass());
private final CompletableFuture<OpcUaClient> future = new CompletableFuture<>();
private final OpcUAClientService opcUAClientService;
public OpcUAClientRunner(OpcUAClientService opcUAClientService) {
this.opcUAClientService = opcUAClientService;
}
public void run() {
try {
// 创建OPC UA客户端
OpcUaClient opcUaClient = createClient();
// future执行完毕后，异步判断状态
future.whenCompleteAsync((c, ex) -> {
if (ex != null) {
logger.error("连接OPC UA服务错误: {}", ex.getMessage(), ex);
}
// 关闭OPC UA客户端
try {
opcUaClient.disconnect().get();
Stack.releaseSharedResources();
} catch (InterruptedException | ExecutionException e) {
logger.error("OPC UA服务关闭错误: {}", e.getMessage(), e);
}
});
try {
// 获取OPC UA服务器的数据
opcUAClientService.run(opcUaClient, future);
future.get(5, TimeUnit.SECONDS);
} catch (Throwable t) {
logger.error("OPC UA客户端运行错误: {}", t.getMessage(), t);
future.completeExceptionally(t);
}
} catch (Throwable t) {
logger.error("OPC UA客户端创建错误: {}", t.getMessage(), t);
future.completeExceptionally(t);
}
}
private OpcUaClient createClient() throws Exception {
Path securityTempDir = Paths.get(System.getProperty("java.io.tmpdir"), "security");
Files.createDirectories(securityTempDir);
if (!Files.exists(securityTempDir)) {
throw new Exception("不能够创建安全路径: " + securityTempDir);
}
KeyStoreLoader loader = new KeyStoreLoader().load(securityTempDir);
// 获取OPC UA的服务器端节点
EndpointDescription[] endpoints =
UaTcpStackClient.getEndpoints(opcUAClientService.getEndpointUrl()).get();
EndpointDescription endpoint = Arrays.stream(endpoints)
.filter(e -> e.getEndpointUrl().equals(opcUAClientService.getEndpointUrl()))
.findFirst().orElseThrow(() -> new Exception("没有节点返回"));
// 设置OPC UA的配置信息
OpcUaClientConfig config =
OpcUaClientConfig.builder()
.setApplicationName(LocalizedText.english("OPC UA SCREEN"))
.setApplicationUri("urn:DATA-TRANSFER:OPC UA SCREEN")
.setCertificate(loader.getClientCertificate())
.setKeyPair(loader.getClientKeyPair())
.setEndpoint(endpoint)
.setIdentityProvider(new UsernameProvider("Administrator", "123456"))
.setRequestTimeout(uint(5000))
.build();
// 创建OPC UA客户端
return new OpcUaClient(config);
}
}
5、OPC UA访问证书类
package com.jndj.platform.common.milo;
import org.eclipse.milo.opcua.sdk.server.util.HostnameUtil;
import org.eclipse.milo.opcua.stack.core.util.SelfSignedCertificateBuilder;
import org.eclipse.milo.opcua.stack.core.util.SelfSignedCertificateGenerator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.*;
import java.security.cert.X509Certificate;
import java.util.regex.Pattern;
class KeyStoreLoader {
private final Logger logger = LoggerFactory.getLogger(getClass());
private static final Pattern IP_ADDR_PATTERN = Pattern.compile(
"^(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])$");
// 证书别名
private static final String CLIENT_ALIAS = "client-ai";
// 获取私钥的密码
private static final char[] PASSWORD = "password".toCharArray();
// 证书对象
private X509Certificate clientCertificate;
// 密钥对对象
private KeyPair clientKeyPair;
KeyStoreLoader load(Path baseDir) throws Exception {
// 创建一个使用`PKCS12`加密标准的KeyStore。KeyStore在后面将作为读取和生成证书的对象。
KeyStore keyStore = KeyStore.getInstance("PKCS12");
// PKCS12的加密标准的文件后缀是.pfx，其中包含了公钥和私钥。
// 而其他如.der等的格式只包含公钥，私钥在另外的文件中。
Path serverKeyStore = baseDir.resolve("example-client.pfx");
logger.info("Loading KeyStore at {}", serverKeyStore);
// 如果文件不存在则创建.pfx证书文件。
if (!Files.exists(serverKeyStore)) {
keyStore.load(null, PASSWORD);
// 用2048位的RAS算法。`SelfSignedCertificateGenerator`为Milo库的对象。
KeyPair keyPair = SelfSignedCertificateGenerator.generateRsaKeyPair(2048);
// `SelfSignedCertificateBuilder`也是Milo库的对象，用来生成证书。
// 中间所设置的证书属性可以自行修改。
SelfSignedCertificateBuilder builder = new SelfSignedCertificateBuilder(keyPair)
.setCommonName("Eclipse Milo Example Client")
.setOrganization("digitalpetri")
.setOrganizationalUnit("dev")
.setLocalityName("Folsom")
.setStateName("CA")
.setCountryCode("US")
.setApplicationUri("urn:eclipse:milo:examples:client")
.addDnsName("localhost")
.addIpAddress("127.0.0.1");
// Get as many hostnames and IP addresses as we can listed in the certificate.
for (String hostname : HostnameUtil.getHostnames("0.0.0.0")) {
if (IP_ADDR_PATTERN.matcher(hostname).matches()) {
builder.addIpAddress(hostname);
} else {
builder.addDnsName(hostname);
}
}
// 创建证书
X509Certificate certificate = builder.build();
// 设置对应私钥的别名，密码，证书链
keyStore.setKeyEntry(CLIENT_ALIAS, keyPair.getPrivate(), PASSWORD, new X509Certificate[]{certificate});
try (OutputStream out = Files.newOutputStream(serverKeyStore)) {
// 保存证书到输出流
keyStore.store(out, PASSWORD);
}
} else {
try (InputStream in = Files.newInputStream(serverKeyStore)) {
// 如果文件存在则读取
keyStore.load(in, PASSWORD);
}
}
// 用密码获取对应别名的私钥。
Key serverPrivateKey = keyStore.getKey(CLIENT_ALIAS, PASSWORD);
if (serverPrivateKey instanceof PrivateKey) {
// 获取对应别名的证书对象。
clientCertificate = (X509Certificate) keyStore.getCertificate(CLIENT_ALIAS);
// 获取公钥
PublicKey serverPublicKey = clientCertificate.getPublicKey();
// 创建Keypair对象。
clientKeyPair = new KeyPair(serverPublicKey, (PrivateKey) serverPrivateKey);
}
return this;
}
// 返回证书
X509Certificate getClientCertificate() {
return clientCertificate;
}
// 返回密钥对
KeyPair getClientKeyPair() {
return clientKeyPair;
}
}
6、业务service类
package com.jndj.platform.phase2.service.impl;
import com.jndj.platform.common.milo.OpcUAClientRunner;
import com.jndj.platform.common.milo.OpcUAClientService;
import com.jndj.platform.phase2.service.Phase2Service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service("phase2Service")
public class Phase2ServiceImpl implements Phase2Service {
@Autowired
private OpcUAClientService opcUAClientService;
@Override
public void searchPhase2ElectricData() {
new OpcUAClientRunner(opcUAClientService).run();
}
}
7、业务Controller类、定时调度
package com.jndj.platform.phase2.controller;
import com.jndj.platform.phase2.service.Phase2Service;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Controller;
import java.text.SimpleDateFormat;
import java.util.Date;
@Controller
public class Phase2Controller {
private static final Logger logger = LoggerFactory.getLogger(Phase2Controller.class);
private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy:mm:dd HH:mm:ss");
@Autowired
private Phase2Service phase2Service;
@Scheduled(initialDelay = 30000, fixedRate = 30000)
public void searchGasData() {
logger.info("####获取二期发电数据（三、四号机组） - 定时任务执行时间："+ dateFormat.format(new Date()));
phase2Service.searchPhase2ElectricData();
}
}
8、运行结果、定时获取到opcua服务中的数据
OK，以上是所有的源代码，大家的问题基本能够解决。
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