java结合opcua实现所有节点遍历
时间: 2023-07-07 20:38:24 浏览: 226
数独 sudoku java 遍历, 简单实现
要实现遍历所有节点,您需要使用Milo OPC UA SDK提供的Browse功能。以下是一个简单的Java代码示例,演示如何使用Milo SDK遍历所有节点:
```java
import org.eclipse.milo.opcua.sdk.client.OpcUaClient;
import org.eclipse.milo.opcua.sdk.client.api.nodes.Node;
import org.eclipse.milo.opcua.sdk.client.api.nodes.NodeType;
import org.eclipse.milo.opcua.sdk.client.model.nodes.objects.ObjectNode;
import org.eclipse.milo.opcua.sdk.client.model.nodes.variables.VariableNode;
import org.eclipse.milo.opcua.stack.core.Identifiers;
import org.eclipse.milo.opcua.stack.core.UaException;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
public class NodeTraversalExample {
public static void main(String[] args) throws UaException, InterruptedException, ExecutionException {
// Create an instance of the OpcUaClient
OpcUaClient client = OpcUaClient.create(endpoint);
// Connect to the OPC UA server
client.connect().get();
// Start browsing the root node
browseNode(client, Identifiers.RootFolder).get();
// Disconnect from the OPC UA server
client.disconnect().get();
}
private static CompletableFuture<Void> browseNode(OpcUaClient client, NodeId nodeId) {
// Browse the node
return client.browse(nodeId).thenCompose(browseResult -> {
// Get the list of reference descriptions
List<ReferenceDescription> references = browseResult.getReferences();
// Iterate through the reference descriptions
for (ReferenceDescription reference : references) {
// Get the node id of the reference
NodeId childNodeId = reference.getNodeId().orElse(null);
// Get the node class of the reference
NodeClass nodeClass = reference.getNodeClass().orElse(null);
// If the reference is a variable or an object, print its information
if (nodeClass == NodeClass.Variable || nodeClass == NodeClass.Object) {
CompletableFuture<Node> nodeFuture = client.getAddressSpace().getNode(childNodeId);
nodeFuture.thenAccept(node -> {
// Get the node id
NodeId nodeId = node.getNodeId().orElse(null);
// Get the node class
NodeClass nodeClass = node.getNodeClass().orElse(null);
// Get the node type
NodeType nodeType = null;
if (nodeClass == NodeClass.Variable) {
nodeType = ((VariableNode) node).getDataType().orElse(null);
} else if (nodeClass == NodeClass.Object) {
nodeType = ((ObjectNode) node).getTypeDefinition().orElse(null);
}
// Get the browse name
String browseName = node.getBrowseName().getName();
// Print the node information
System.out.println("Node ID: " + nodeId.toString() + " Node Class: " + nodeClass.toString() +
" Node Type: " + nodeType + " Browse Name: " + browseName);
}).exceptionally(ex -> {
ex.printStackTrace();
return null;
});
}
// Recursively browse the child node
browseNode(client, childNodeId);
}
return CompletableFuture.completedFuture(null);
});
}
}
```
在这个示例中,我们首先创建了一个OpcUaClient实例,并使用connect()方法连接到OPC UA服务器。然后,我们从根文件夹开始浏览,并使用browseNode()方法递归地遍历所有子节点。在每次遍历一个节点时,我们都打印节点的信息,包括节点ID、节点类型、浏览名称等。最后,我们使用disconnect()方法断开与OPC UA服务器的连接。
请注意,此示例代码仅用于演示如何使用Milo OPC UA SDK遍历所有节点。在实际应用中,您可能需要对此代码进行修改以满足您的具体需求。
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