在Java中执行 Groovy Script 技巧
发布时间：2021-11-20 17:42:03 所属栏目：教程 来源：互联网
导读：如何在Java中执行 Groovy Script，例如： GroovyShell shell = new GroovyShell(); Script scrpt = shell.parse(script.groovy); Binding binding = new Binding(); binding.setVariable(str1, value1); binding.setVariable(str2, value2); scrpt.setBindin
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如何在Java中执行 Groovy Script，例如： GroovyShell shell = new GroovyShell(); Script scrpt = shell.parse("script.groovy"); Binding binding = new Binding(); binding.setVariable("str1", "value1"); binding.setVariable("str2", "value2"); scrpt.setBinding(binding); System.out.println(scrpt.evaluate("customConcat(str1, str2)")); System.out.println(scrpt.evaluate("str1.concat(str2)")); script.groovy: def customConcat(def str1, def str2) { str1.concat(str2) } 正常执行System.out.println(scrpt.evaluate("str1.concat(str2)")); 执行System.out.println(scrpt.evaluate("customConcat(str1, str2)"))出现异常： groovy.lang.MissingMethodException: No signature of method: Script1.customConcat() is applicable for argument types: (java.lang.String, java.lang.String) values: [value1, value2] at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:55) at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:78) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:49) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:133) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:145) at Script1.run(Script1.groovy:1) at groovy.lang.GroovyShell.evaluate(GroovyShell.java:518) 我们用groovyClassLoader来加载却可以执行： GroovyClassLoader loader = new GroovyClassLoader(); Class groovyClass = loader.parseClass(new File("C:/Users/Cagri/Desktop/IntergisGroovyScript.groovy")); GroovyObject groovyObject = (GroovyObject) groovyClass.newInstance(); Object res = groovyObject.invokeMethod("customConcat", new Object[]{"value1", "value2"}); 这种调用evaluate()执行脚本方法行不通是因没有脚本里定义的方法没有绑定，因此可以把script绑定给binding，然后执行的binding的引用方法： Binding binding = new Binding(); GroovyShell shell = new GroovyShell(binding); Script scrpt = shell.parse("script.groovy"); binding.setVariable("str1", "value1"); binding.setVariable("str2", "value2"); binding.setVariable("newConcat", scrpt); System.out.println(scrpt.evaluate("newConcat.customConcat(str1, str2)")); System.out.println(scrpt.evaluate("str1.concat(str2)")); 或者使用： System.out.println(scrpt.invokeMethod("customConcat", new String[]{"value1","value2"}));  （编辑：江门站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
