java 调用groovy脚本，实现多个sql按指定逻辑运行，可做报表预聚合

1、引入pom

		<dependency><groupId>org.codehaus.groovy</groupId><artifactId>groovy</artifactId><version>2.1.6</version></dependency><dependency><groupId>org.codehaus.groovy</groupId><artifactId>groovy-jsr223</artifactId><version>2.1.6</version></dependency>

2、调用脚本

其中，getConnection()方法需自己实现，就是简单的根据用户名密码获取数据库连接

    public static void main(String[] args) throws Exception {ScriptEngineManager factory = new ScriptEngineManager();ScriptEngine engine = factory.getEngineByName("groovy");Bindings binding = engine.createBindings();binding.put("connection", getConnection());// 绑定jdbc链接String script = getScript();engine.eval(script, binding);// 绑定脚本和connectionObject res = ((Invocable) engine).invokeFunction("execute", null);// 执行System.out.println(res);List<Map<String, Object>> list = getList((ResultSet)res); // 转换结果listSystem.out.println(list);}// 返回groovy脚本语言，这个只做示例，里面可以写各种逻辑，且不局限于mysqlprivate static String getScript(){return "def execute(){return connection.prepareStatement('select * from business').executeQuery();}";}// executeQuery方法返回的对象转成listprivate static List<Map<String, Object>> getList(ResultSet resultSet) throws SQLException {ResultSetMetaData metaData = resultSet.getMetaData();int cols_len = metaData.getColumnCount();List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();while (resultSet.next()) {Map<String, Object> map = new HashMap<>();String colName;for (int i = 0; i < cols_len; i++) {map.put(colName = metaData.getColumnLabel(i + 1), resultSet.getString(colName));}list.add(map);}return list;}