【解决办法】
Workspace workspace = new Workspace();
WorkspaceConnectionInfo info = new WorkspaceConnectionInfo();
//数据库连接地址
info.setServer("127.0.0.1:5432");
//数据库连接类型
info.setType(WorkspaceType.PGSQL);
//数据库名
info.setDatabase("database");
//数据库用户名
info.setUser("username");
//数据库密码
info.setPassword("password");
//工作空间名称
info.setName("testpqsql");
boolean flag = workspace.open(info);
System.out.println("open success: " + flag);
