java读取OPC DA数据---Utgard

java读取OPC DA数据—Utgard

Utgard库已经过时，原作者早已删除库，建议使用OPC UA，兼容OPC DA。

下面讲解Utgard使用

• C#和C++都不用配置DCOM，直接调用函数

• 既然是非要用Java，那就别想太方便，需要配置DCOM(后面博客介绍)。

Java实现OPC客户端有两种

有两种开源包，分别是JeasyOpc和utgard（Openscada），他们的区别如下：

经对比分析，我们采用Utgard（Openscada）开源技术，Openscada可以很好的实现与OPC服务器的链接及读写数据等功能，还可以随时获取和修改OPC的Server和Item的属性状态信息。所以它能够很好的满足我们的需求，建议使用Openscada。

关于Utgard

• Utgard是一个开源的项目，基于j-interop做的，用于和OPC SERVER通讯。

• j-interop是纯java封装的用于COM/DCOM通讯的开源项目，这样就不必使用JNI

• Utgard则是纯java编写，就是不支持opc 3.0协议。

关于JeasyOPC

• 借助一个dll库来实现的和OPCServer的通信，但是JCustomOpc.dll，，太老了，而且支持只32位系统
• JEasy是java调用动态连接库，底层用的是jni，dll库比较老。

建议选择Utgard

java使用Utgard读取OPC数据

pom.xml引入包

<dependency>
			<groupId>org.openscada.utgardgroupId>
			<artifactId>org.openscada.opc.libartifactId>
			<version>1.5.0version>
			<exclusions>
				<exclusion>
					<groupId>org.bouncycastlegroupId>
					<artifactId>bcprov-jdk15onartifactId>
				exclusion>
			exclusions>
		dependency>
		<dependency>
			<groupId>org.bouncycastlegroupId>
			<artifactId>bcprov-jdk15onartifactId>
			<version>1.65version>
		dependency>
		<dependency>
			<groupId>org.openscada.utgardgroupId>
			<artifactId>org.openscada.opc.dcomartifactId>
			<version>1.5.0version>
		dependency>
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伪代码读取OPC

OPC DA客户端工具Opc quick client使用

import org.jinterop.dcom.common.JIErrorCodes;
import org.jinterop.dcom.common.JIException;
import org.jinterop.dcom.core.JIVariant;
import org.openscada.opc.dcom.da.OPCSERVERSTATE;
import org.openscada.opc.lib.common.ConnectionInformation;
import org.openscada.opc.lib.da.*;

import java.util.concurrent.Executors;

public class Test {

    public static void main(String[] args) throws Exception {
        test();
    }

    public static void test() throws Exception {
        final ConnectionInformation ci = new ConnectionInformation();
        ci.setHost("10.211.55.4");
        ci.setUser("OPCUser");
        ci.setPassword("opcuser");
        //注册表ID，可以在“组件服务”里看到  也可以在我的博客(https://blog.csdn.net/yinjl123456/article/details/121756075)中找到
        ci.setClsid("7BC0CC8E-482C-47CA-ABDC-0FE7F9C6E729");
        Item item = null;
        Server server = new Server(ci, null);
        try {
            server.connect();
            Group group = server.addGroup();
            item = group.addItem("tongdao.tag1.aaa");
            System.out.println("111111==" + getVal(item.read(true).getValue()));
            Thread.sleep(2000);

            System.out.println("ddddd===" + server.getServerState());
            System.out.println("ddddd===" + server.getServerState().getServerState());
            //ddddd===OPC_STATUS_RUNNING
            if (OPCSERVERSTATE.OPC_STATUS_RUNNING == server.getServerState().getServerState()) {
                System.out.println("OPC_STATUS_RUNNING ---------");
            }

            Group group2 = server.addGroup();
            item = group2.addItem("tongdao.tag1.abc");
            System.out.println("22222==" + getVal(item.read(true).getValue()));
            Thread.sleep(2000);

            server.dispose();

            System.out.println("xxxxxx===" + server.getServerState());
            //xxxxxx===null
            if (null == server.getServerState()) {
                System.out.println("OPC no ==================");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

        /**
         * 获取value
         * @param var
         * @return
         * @throws JIException
         */
        private static Object getVal(JIVariant var) throws JIException {
            Object value;
            int type = var.getType();
            switch (type) {
                case JIVariant.VT_I2:
                    value = var.getObjectAsShort();
                    break;
                case JIVariant.VT_I4:
                    value = var.getObjectAsInt();
                    break;
                case JIVariant.VT_I8:
                    value = var.getObjectAsLong();
                    break;
                case JIVariant.VT_R4:
                    value = var.getObjectAsFloat();
                    break;
                case JIVariant.VT_R8:
                    value = var.getObjectAsDouble();
                    break;
                case JIVariant.VT_BSTR:
                    value = var.getObjectAsString2();
                    break;
                case JIVariant.VT_BOOL:
                    value = var.getObjectAsBoolean();
                    break;
                case JIVariant.VT_UI2:
                case JIVariant.VT_UI4:
                    value = var.getObjectAsUnsigned().getValue();
                    break;
                case JIVariant.VT_EMPTY:
                    throw new JIException(JIErrorCodes.JI_VARIANT_IS_NULL, "Variant is Empty.");
                case JIVariant.VT_NULL:
                    throw new JIException(JIErrorCodes.JI_VARIANT_IS_NULL, "Variant is null.");
                default:
                    throw new JIException(JIErrorCodes.JI_VARIANT_IS_NULL, "Unknown Type.");
            }

            return value;
        }

}
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参考链接:
https://www.cnblogs.com/Frankie1980/p/10830119.html
https://www.cnblogs.com/ioufev/p/9928971.html
https://www.hifreud.com/2014/12/27/opc-4-client-invoke-use-utgard/
https://blog.csdn.net/wise18146705004/article/details/82347926
https://blog.csdn.net/lgbisha/article/details/82898228