如何在JAVA中连接Z39.50和YAZ客户端？

import org.yaz4j.Connection;
import org.yaz4j.PrefixQuery;
import org.yaz4j.ResultSet;
import org.yaz4j.exception.ZoomException;

public class Z3950Example {
    public static void main(String[] args) {
        // 创建Z39.50客户端连接
        Connection connection = new Connection("z3950.example.com", 210);
        
        try {
            // 建立连接
            connection.connect();
            
            // 配置连接参数
            connection.setDatabaseName("database");
            
            // 发送搜索请求
            ResultSet resultSet = connection.search(new PrefixQuery("@attr 1=4 science"));
            
            // 处理响应
            while (resultSet.next()) {
                System.out.println(resultSet.getRecord().render());
            }
            
            // 关闭连接
            connection.close();
        } catch (ZoomException e) {
            e.printStackTrace();
        }
    }
}