1.先配置

 1.下载sapjco3.dll插件置放在JDK或Tomcat的bin文件夹下

2.在项目中，新建一个jar目录；把sapjco3.jar和sapjco.jar复制进去，并添加上依赖

3.pom文件配置：

<!--添加的本地依赖-->
<dependency>
   <groupId>com.sapjco3</groupId>
   <artifactId>sapjco3-lib</artifactId>
   <version>3.0</version>
   <scope>system</scope>
   <systemPath>${project.basedir}/src/main/resources/jar/sapjco3.jar</systemPath>
</dependency>
<dependency>
   <groupId>com.sapjco</groupId>
   <artifactId>sapjco-lib</artifactId>
   <version>1.0</version>
   <scope>system</scope>
   <systemPath>${project.basedir}/src/main/resources/jar/sapjco.jar</systemPath>
</dependency>

4.开始连接：

import com.alibaba.fastjson.JSON;
import com.sap.conn.jco.*;
import com.sap.conn.jco.ext.DestinationDataProvider;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * @description: sap连接
 * @author: Administrator
 * @date: 2019-02-21 13:18
 */
@Component
public class MySapUtils {

    public static Log log = LogFactory.getLog(MySapUtils.class);

    //JCO配置名称；这里是生成的配置信息，一个配置信息对应一个文件，名称也就变了；我一开始用ABAP_WITHOUT_POOL不行 ，后来用      //ABAP5_WITHOUT_POOL这个名字就好了
    static String ABAP_T = "ABAP5_WITHOUT_POOL";

    public static JCoTable getTableList(String functionStr, String tablename, Map<String, Object> param){
        Properties connectProperties = new Properties();
        connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST,
                "127.0.0.1");//IP
        connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR, "00");////系统编号
        connectProperties
                .setProperty(DestinationDataProvider.JCO_CLIENT, "10");////客户端编号
        connectProperties.setProperty(DestinationDataProvider.JCO_USER,
                "username");//用户名
        // 注：密码是区分大小写的，要注意大小写
        connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD,
                "password");//密码
        connectProperties.setProperty(DestinationDataProvider.JCO_LANG, "zh");//语言

        File cfg = new File(ABAP_T + "." + "jcoDestination");
        System.err.println(cfg.getPath());
        if (!cfg.exists()) {
            try {
                FileOutputStream fos = new FileOutputStream(cfg, false);
                connectProperties.store(fos, "for tests only !");
                fos.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        JCoFunction function = null;
        JCoDestination destination = null;
        try {
            destination = JCoDestinationManager.getDestination(ABAP_T);
            function = destination.getRepository().getFunction(functionStr);
            JCoParameterList input = function.getImportParameterList();

            // 遍历map中的键
            for (String key : param.keySet()) {
                input.setValue(key,param.get(key));
            }

            function.execute(destination);
            JCoTable tb = function.getTableParameterList().getTable(tablename);

            return tb;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void  main(String[] args){
        //请求sap，发送消息
        getMessage();


    }
    public static List<Message> getMessage(){
        List<Message> messageList=new ArrayList<>();
        Map<String, Object> param = new HashMap<>();

        //Z_WX_GET_PO_RCAB是sap提供的方法名，T_ABC是sap那边提供的表名
        JCoTable tb = getTableList("Z_WX_GET_PO_RCAB", "T_ABC", param);
        System.err.println(tb);
       
    }
}

5.测试返回的信息：

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6.项目打包jar放到服务器上

我的是windowsserver

6.1先把sapjco3.dll文件复制到服务器的jdk的bin目录下，pom文件中：

然后打包jar放到服务器运行就可以了，不过打包war好像有问题（我没测试）