Java Groovy集成

import java.lang.reflect.Method; import java.util.Map; import groovy.lang.Binding; import groovy.lang.GroovyClassLoader; import groovy.lang.GroovyObject; import groovy.lang.GroovyShell; import groovy.lang.Script; /** * Groovy脚本工具类 * */ public class GroovyUtils { /** * 执行Groovy脚本，创建类实例执行 * * @param code Groovy脚本编码 * @param method 方法名 * @return Groovy脚本执行结果 * @throws Exception */ public static Object invokeByInstance(Object obj, String method, Object... args) throws Exception { GroovyObject groovyObject = (GroovyObject) obj; Object result = groovyObject.invokeMethod(method, args); return result; } /** * 执行Groovy脚本，以静态方式执行 * * @param code Groovy脚本编码 * @param method 方法名 * @return Groovy脚本执行结果 * @throws Exception */ public static Object invoke(Class<?> cls, String method, Object... args) throws Exception { Class<?>[] parameterTypes = null; if (args != null && args.length > 0) { parameterTypes = new Class<?>[args.length]; for (int i = 0; i < args.length; i++) { if (args[i] == null) { parameterTypes[i] = Object.class; } else { parameterTypes[i] = args[i].getClass(); } } } Method methodObject = cls.getDeclaredMethod(method, parameterTypes); Object result = methodObject.invoke(null, args); return result; } /** * 初始化类，并存入缓存 * * @param content Groovy脚本脚本内容 * @return 编译好的类 * @throws Exception 找不到或无法加载Groovy脚本类时，抛出异常 */ public static Class<?> initCls(String content) throws Exception { ClassLoader cl = GroovyUtils.class.getClassLoader(); GroovyClassLoader gcl = new GroovyClassLoader(cl); try { Class<?> groovyCls = gcl.parseClass(content); if (groovyCls == null) { throw new IllegalAccessException("Rule content can not be parsed as a Class, ensure the content is correct.\r\n" + content); } return groovyCls; } finally { gcl.close(); } } /** * 编译脚本 * * @param scriptText 脚本内容 * @return Script对象 */ public static Script initScript(final String scriptText) { return new GroovyShell().parse(scriptText); } /** * 执行脚本 * * @param script Script对象 * @return 执行结果 */ public static Object invokeScript(Script script) { return script.run(); } /** * 执行脚本 * * @param script Script对象 * @param binding Binding对象，用于绑定脚本所需外部变量 * @return 执行结果 */ public static Object invokeScript(Script script, Binding binding) { script.setBinding(binding); return script.run(); } /** * 执行脚本 * * @param script Script对象 * @param variables 脚本所需外部变量Map * @return 执行结果 */ public static Object invokeScript(Script script, Map<?, ?> variables) { Binding binding = new Binding(variables); return invokeScript(script, binding); } /** * 执行脚本 * * @param scriptText 脚本内容 * @return 执行结果 */ public static Object invokeScript(String scriptText) { return invokeScript(initScript(scriptText)); } /** * 执行脚本 * * @param scriptText 脚本内容 * @param binding Binding对象，用于绑定脚本所需外部变量 * @return */ public static Object invokeScript(String scriptText, Binding binding) { return invokeScript(initScript(scriptText), binding); } /** * 执行脚本 * * @param scriptText 脚本内容 * @param variables 脚本所需外部变量Map * @return */ public static Object invokeScript(String scriptText, Map<String, Object> variables) { Binding binding = new Binding(variables); return invokeScript(scriptText, binding); } } public String executeTemplate(final String template, final Map<String, Object> variables) { securityChecks(template); return executeTemplate(new SimpleTemplateEngine(), template, variables); } public String executeTemplate(final TemplateEngine templateEngine, final String template, final Map<String, Object> variables) { securityChecks(template); if (template == null) { return null; } try { final Template templateObject = templateEngine .createTemplate(template); final Writable writable = templateObject.make(variables); final StringWriter writer = new StringWriter(); writable.writeTo(writer); writer.flush(); if (log.isDebugEnabled() == true) { log.debug(writer.toString()); } return writer.toString(); } catch (CompilationFailedException ex) { log.error(ex.getMessage() + " while executing template: " + template, ex); } catch (FileNotFoundException ex) { log.error(ex.getMessage() + " while executing template: " + template, ex); } catch (ClassNotFoundException ex) { log.error(ex.getMessage() + " while executing template: " + template, ex); } catch (IOException ex) { log.error(ex.getMessage() + " while executing template: " + template, ex); } return null; }