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【Java】动态执行代码的代码

作者:xiaoqqq / 发布于2014/9/20/ 376


	public class ScriptUtils {
	
	 private static final Logger logger = LoggerFactory.getLogger(ScriptUtils.class);
	
	 /**
	 *
	 * 执行字符串计算
	 * @param express
	 * @param params
	 * @return
	 * @throws ScriptException
	 */
	 @SuppressWarnings("unchecked")
	 public static <T, E> E eval(String express, Map<String, T> params) throws ScriptException{
	 ScriptEngineManager manager = new ScriptEngineManager();
	 ScriptEngine engine = manager.getEngineByName("js");
	 if(params == null){
	 params = new HashMap<String,T>();
	 }
	 Iterator<Map.Entry<String, T>> iter = params.entrySet().iterator();
	 Map.Entry<String, T> entry = null;
	 while(iter.hasNext()){
	 entry = iter.next();
	 engine.put(entry.getKey(), entry.getValue());
	 }
	 E result = null;
	 try {
	 result = (E)engine.eval(express);
	 } catch (ScriptException e) {
	 logger.warn("表达式执行异常： " + e.getMessage());
	 }
	 return result;
	 }
	
	 /**
	 * 解析字符串， 并将其当作表达式执行
	 * @param express
	 * @param params
	 * @return
	 * @throws ScriptException
	 */
	 public static <T> Boolean evalBoolean(String express, Map<String, T> params) {
	 ScriptEngineManager manager = new ScriptEngineManager();
	 ScriptEngine engine = manager.getEngineByName("js");
	 if(params == null){
	 params = new HashMap<String,T>();
	 }
	 Iterator<Map.Entry<String, T>> iter = params.entrySet().iterator();
	 Map.Entry<String, T> entry = null;
	 while(iter.hasNext()){
	 entry = iter.next();
	 engine.put(entry.getKey(), entry.getValue());
	 }
	 Boolean result = null;
	 try {
	 result = (Boolean)engine.eval(express);
	 } catch (ScriptException e) {
	 result = false;
	 logger.warn("表达式执行异常： " + e.getMessage());
	 }
	 return result;
	 }

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