Java连接SAP RFC 实现数据抽取

包管理

首先要连接SAP需要两个包，分别为sapjco3.jar和sapjco3.dll，切记这两个包需要放在同一目录；否则会报错。

我先尝试将这两个包发到私服上，再在pom.xml文件中引入，发现.dll文件下载不了；于是就将这两个包放在根目录sap下，dockerfile构建镜像时将这两个包copy到jdk/lib目录下。

COPY sap/sapjco3.dll /usr/local/jdk-17.0.5/lib/
COPY sap/sapjco3.jar /usr/local/jdk-17.0.5/bin/

功能介绍

• 连接SAP
• 入参获取
• 出参获取
• 函数列表获取
• 表名获取
• 函数执行
• 执行结果获取

Java连接SAP RFC

public class CheckSnFromSAP {

    private static final String ABAP_AS_POOLED = "ABAP_AS_WITH_POOL";

    public static void main(String[] args) {
        JCoFunction function = null;

        MyDestinationDataProvider destDataProvider = new MyDestinationDataProvider();
        try {

            Properties connectProperties = new Properties();
            connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, "xxx");// 服务器
            connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR, "xx"); // 系统编号
            connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "xxx"); // SAP集团
            connectProperties.setProperty(DestinationDataProvider.JCO_USER, "xxx"); // SAP⽤户名
            connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "xxx"); // 密码
            connectProperties.setProperty(DestinationDataProvider.JCO_LANG, "ZH"); // 登录语⾔:ZH EN
            connectProperties.setProperty(DestinationDataProvider.JCO_POOL_CAPACITY, "3"); // 最⼤连接数
            connectProperties.setProperty(DestinationDataProvider.JCO_PEAK_LIMIT, "10"); // 最⼤连接线程

            // 注册连接参数

            destDataProvider.addDestination(ABAP_AS_POOLED, connectProperties);
            Environment.registerDestinationDataProvider(destDataProvider);

            // 创建一个与SAP系统的连接
            JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);

            // 调用函数
            function = destination.getRepository().getFunction("funcationName");
            if(null == function) {
                throw new RuntimeException("无此函数");
            }

            // 输入字段
            JCoListMetaData listMetaData = function.getImportParameterList().getListMetaData();
            List<Map<String, String>> inputFields = new ArrayList<>();
            for (int i=0; i< listMetaData.getFieldCount(); i++) {
                Map<String, String> row = new HashMap<>();
                String name = listMetaData.getName(i);
                String type = listMetaData.getTypeAsString(i);
                String sapType = listMetaData.getRecordTypeName(i);
                String description = listMetaData.getDescription(i);
                row.put("name", name);
                row.put("type", type);
                row.put("sapType", sapType);
                row.put("description", description);
                inputFields.add(row);
            }

            // 输出字段
            JCoTable output = function.getTableParameterList().getTable("XXX");
            JCoRecordMetaData recordMetaData = output.getRecordMetaData();
            List<Map<String, String>> outputFields = new ArrayList<>();
            for (int i=0; i< recordMetaData.getFieldCount(); i++) {
                Map<String, String> row = new HashMap<>();
                String name = recordMetaData.getName(i);
                String type = recordMetaData.getTypeAsString(i);
                String sapType = recordMetaData.getRecordTypeName(i);
                String description = recordMetaData.getDescription(i);
                row.put("name", name);
                row.put("type", type);
                row.put("sapType", sapType);
                row.put("description", description);
                outputFields.add(row);
            }

            // 获取所有函数
            function = destination.getRepository().getFunction("RFC_FUNCTION_SEARCH");
                    if(null == function) {
                throw new RuntimeException("无此函数");
            }
            JCoParameterList importParams = function.getImportParameterList();
                    importParams.setValue("FUNCNAME", "*"); // Search for all functions
                    function.execute(destination);
            JCoTable functionTable = function.getTableParameterList().getTable("FUNCTIONS");
            int max = Math.min(functionTable.getNumRows(),500);
                    for (int i = 0; i <max; i++) {
                functionTable.setRow(i);

                String functionName = functionTable.getString("FUNCNAME");

                System.out.println("函数名:"+functionName);

            }
            
            //获取所有表名
            JCoParameterList tableParameterList = function.getTableParameterList();
            if(tableParameterList!=null){
                for (JCoField jCoField : tableParameterList) {
                    System.out.println("表：" + jCoField.getName());
                }
            }


            // 输⼊参数修改
            JCoParameterList input = function.getImportParameterList();
            input.setValue("I_END", "2017-05-01");
            input.setValue("I_START", "2017-01-01");

//            JCoTable it_matnr = function.getTableParameterList().getTable("XXX");//以表作为请求参数
//            it_matnr.appendRow();
//            it_matnr.setValue("age",18);//设置表值

            //方法执行
            function.execute(destination);

            // 函数执行结果
            JCoTable jcoTable = function.getTableParameterList().getTable("tableName");
            int numRows = jcoTable.getNumRows();//行数为0可以直接return
            for (int i = 0; i < numRows; i++) {
                jcoTable.setRow(i);//设置索引 获取返回表里的数据
                String fieldValue= jcoTable.getString("fieldName");//解析表字段值
                System.out.println(fieldValue);
            }


        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 取消环境注册
            Environment.unregisterDestinationDataProvider(destDataProvider);
        }

    }
}

/**
 * 实现DestinationDataProvider接口，用于注册连接参数
 */
class MyDestinationDataProvider implements DestinationDataProvider {
    private DestinationDataEventListener eventListener;
    private Map<String, Properties> destinationProperties;

    public MyDestinationDataProvider() {
        destinationProperties = new HashMap<>();
    }

    public void addDestination(String destinationName, Properties properties) {
        destinationProperties.put(destinationName, properties);
    }

    @Override
    public Properties getDestinationProperties(String destinationName) {
        if (destinationProperties.containsKey(destinationName)) {
            return destinationProperties.get(destinationName);
        }
        return null;
    }

    @Override
    public void setDestinationDataEventListener(DestinationDataEventListener eventListener) {
        this.eventListener = eventListener;
    }

    @Override
    public boolean supportsEvents() {
        return true;
    }
}

当然也可以通过创建文件的方式保存连接属性

public class SapConnection {

    private static final String ABAP_AS_POOLED = "ABAP_AS_WITH_POOL";

    static {
        Properties connectProperties = new Properties();
        connectProperties.setProperty(DestinationDataProvider.JCO_ASHOST, "xxx");// 服务器
        connectProperties.setProperty(DestinationDataProvider.JCO_SYSNR, "xx"); // 系统编号
        connectProperties.setProperty(DestinationDataProvider.JCO_CLIENT, "xxx"); // SAP集团
        connectProperties.setProperty(DestinationDataProvider.JCO_USER, "xxx"); // SAP⽤户名
        connectProperties.setProperty(DestinationDataProvider.JCO_PASSWD, "xxx"); // 密码
        connectProperties.setProperty(DestinationDataProvider.JCO_LANG, "ZH"); // 登录语⾔:ZH EN
        connectProperties.setProperty(DestinationDataProvider.JCO_POOL_CAPACITY, "3"); // 最⼤连接数
        connectProperties.setProperty(DestinationDataProvider.JCO_PEAK_LIMIT, "10"); // 最⼤连接线程

        createDataFile(ABAP_AS_POOLED, "jcoDestination", connectProperties);
    }

    /**
     * 创建sap接口属性文件
     * @param name
     * @param suffix
     * @param properties
     */
    private static void createDataFile(String name, String suffix, Properties properties) {
        File cfg = new File(name + "." + suffix);
        if (cfg.exists()) {
            cfg.deleteOnExit();
        }
        try {
            FileOutputStream fos = new FileOutputStream(cfg, false);
            properties.store(fos, "for tests only !");
            fos.close();
        } catch (Exception e) {
            System.out.println("Create Data file fault, error msg: " + e.toString());
            throw new RuntimeException("Unable to create the destination file " + cfg.getName(), e);
        }
    }

    /**
     * 获取sap连接
     * @return
     */
    public static JCoDestination connect() {
        JCoDestination destination = null;
        try {
            destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);
        } catch (JCoException e) {
            System.out.println("Connect SAP fault, error msg: " + e.toString());
        }
        return destination;
    }

}

在使用场景中，我遇到了这样一种情况：

SpringBoot服务已启动，sap函数入参两个，上面代码获取sap函数入参两个； 我将sap函数入参改为三个后，上面代码获取还是两个😢，重启服务后获取就是正确的三个了。

经过研究发现，JCoDestinationManager.getDestination(ABAP_AS_POOLED);会缓存destination连接,每次都是先从缓存中取

RfcDestination destination = (RfcDestination)this.destinations.get(destinationName);

查看destination.getRepository()会发现storage字段缓存了function等信息；解决办法是：

// 清除缓存
destination.getRepository().clear();

清除缓存后，每次会获取新的内容。