现在使用java来做工控系统的几种方式：

知识储备：

一、OPC Server端目前常见的有以下几种协议:

参考博客：
https://www.cnblogs.com/ioufev/articles/9697717.html

https://www.cnblogs.com/ioufev/articles/9697890.html

二、DOCM的配置

可以参考https://www.cnblogs.com/ioufev/p/9365919.html

三、OPCServer服务器属性

java 获取OPCServer的方式有两种，

1、jeasyopc：适用于32位操作系统

2、Utgrad ：可跨平台

可以根据具体情况具体分析，相比较对于初次接触来说jeasyopc相对简单。

四、试验模拟OPC

1、实验用模拟OPCServer（50M）：MatrikonOPC

2、实际OPCServer使用（450M，中文）：KEPServer V6

Utgard：

官网：http://openscada.org/projects/utgard/

博客参考

https://www.cnblogs.com/ioufev/articles/9894452.html

https://elfasd.iteye.com/blog/2064410

JeasyOPC：

博客参考：

https://blog.csdn.net/qq_33720460/article/details/78478430

https://blog.csdn.net/wangzhi291/article/details/45029799

https://blog.csdn.net/diyu122222/article/details/77645668

五：本人只采用了UtgradUt开发用例

/**

*  OPCServer 客户端连接

*/

public class UtgrandClient {

private final String LOCAL_HOST="10.0.0.17";//OPCServer服务器IP

private final String USER_NAME ="OPCServer";//DOCM配置时OPCServer的用户名

private final String PASS_WORD ="Admin123";//密码

private final String  CLS_ID ="7BC0CC8E-482C-47CA-ABDC-0FE7F9C6E729";//cls_id

private final String  DOMAIN ="";

private  int count;

Server server =null;

public  void utGrandReadData(){

System.out.print("*********************************");

System.out.print("************启动加载配置项*********");

System.out.print("*********************************");

final  ConnectionInformation ci =new ConnectionInformation();

ci.setHost(LOCAL_HOST);

ci.setUser(USER_NAME);

ci.setPassword(PASS_WORD);

ci.setClsid(CLS_ID);

ci.setDomain(DOMAIN);

if (ci.getClsid() !=null ){

JISession  session = JISession.createSession ( ci.getDomain (),ci.getUser (),ci.getPassword () );

session.setGlobalSocketTimeout ((int) System.currentTimeMillis());

session.useSessionSecurity(true);

server =new Server(ci,Executors.newSingleThreadScheduledExecutor());

}else if (ci.getProgId () !=null){

JISession session = JISession.createSession ( ci.getDomain (), ci.getUser (), ci.getPassword () );

session.setGlobalSocketTimeout ((int) System.currentTimeMillis());

session.useSessionSecurity(true);

server =new Server(ci,Executors.newSingleThreadScheduledExecutor());

}

try {

server.connect();

Group group = server.addGroup("VC");

Item item = group.addItem("k.k.k");

//    Map items = group.addItems("Random.Real1",

//          "Random.Real2", "Random.Real3", "Random.Real4");

dumpItem(item);

//    for (Entry temp : items.entrySet()) {

//      dumpItem(temp.getValue());

//    }

}catch (Exception e) {

e.printStackTrace();

}

}

/**

* 读取监测点

* @param item

* @throws JIException

*/

private  void dumpItem(Item item)throws JIException {

System.out.println("[" + (++count) +"],ItemName:[" + item.getId()

+"],value:" + item.read(true).getValue());

}

}

/**

* 使用线程来控制 opc client连接，优化运行机内存。（48小时测试内存无增长）

*/

public class ThreadUtgrad {

private Date date;//对象锁

private boolean flag =false;//控制唤醒或等待线程

public ThreadUtgrad() {

date =new Date();

}

public ThreadUtgrad(Date date){

this.date = date;

}

public void run() {

while(true){

synchronized(date){

if(flag){

try {

Thread.sleep(500);

}catch (InterruptedException e) {

e.printStackTrace();

}

date.notify();

flag =false;

}

}

}

}

public Date getDate() {

return date;

}

public void setDate(Date date) {

this.date = date;

}

class PrintMessageextends Thread{

@Override

public void run() {

UtgrandClient utgrandClient =new UtgrandClient();

while(true){

synchronized(date){

if(!flag){

try {

flag =true;

date.wait();

}catch (InterruptedException e) {

e.printStackTrace();

}

}

System.out.println("0.5秒的消息");

utgrandClient.utGrandReadData();

}

}

}

}

@PostConstruct

public void startUtgrandClient() {

Date date =new Date();

//打印5秒消息的线程

ThreadUtgrad threadUtgrad =new ThreadUtgrad(date);

PrintMessage printMessage = threadUtgrad.new PrintMessage();

printMessage.start();

threadUtgrad.run();

//        //不影响打印线程的7秒消息线程

//        new Thread(new Runnable(){

//

//            @Override

//            public void run() {

//                while(true){

//                    try {

//                        Thread.sleep(7000);

//                    } catch (InterruptedException e) {

//                        e.printStackTrace();

//                    }

//                    System.out.println("7秒的消息");

//                }

//

//            }

//

//        }).start();

}