我在Groovy和Beanshell中解释相同的脚本.

Groovy需要很长时间(26分25秒),而Beanshell只需要20秒.

我对这种差异感到非常惊讶,我不明白为什么,Beanshell会更好吗？我使用Groovy是错的吗？

Groovy代码：

public  void calcule_irg(double salaire) throws Throwable{
        Binding binding = new Binding();
        binding.setVariable("MNT_943", 0);
       String script="double formule_irg(Double salaireSoumis) {\n" +
"    int salaire = salaireSoumis.intValue();\n" +
"    salaire = salaire / 10 * 10;\n" +
"                \n" +
"    Double impots = 0.0;\n" +
"                \n" +
"    if (salaire >= 15000 && salaire <= 22500) {\n" +
"        impots = ((salaire - 10000) * 0.2) - 1000.0;\n" +
"    } else if (salaire > 22500 && salaire <= 30000) {\n" +
"        impots = ((salaire - 10000) * 0.2);\n" +
"        impots = impots - (impots * 0.4);\n" +
"    } else if (salaire >= 30001 && salaire <= 120000) {\n" +
"        impots = 2500 + ((salaire - 30000) * 0.3);\n" +
"    } else if (salaire >= 120001) {\n" +
"        impots = 29500 + ((salaire - 120000) * 0.35);\n" +
"    } else {\n" +
"        impots = 0.0;\n" +
"    }\n" +
"                \n" +

"    return impots.intValue();\n" +
"} \n" +
"\n" +
"MNT_943 = formule_irg("+salaire+") ;\n";
        GroovyShell shell = new GroovyShell(binding);
        shell.evaluate(script);

        Double   value =(Double) shell.getVariable("MNT_943");

    }

Beanshell代码：

public  void calcule_irg(double salaire) throws EvalError {
           Interpreter i = new Interpreter();  // Construct an interpreter

        // Eval a statement and get the result
         String script="double formule_irg(Double salaireSoumis) {\n" +
"    int salaire = salaireSoumis.intValue();\n" +
"    salaire = salaire / 10 * 10;\n" +
"                \n" +
"    Double impots = 0.0;\n" +
"                \n" +
"    if (salaire >= 15000 && salaire <= 22500) {\n" +
"        impots = ((salaire - 10000) * 0.2) - 1000.0;\n" +
"    } else if (salaire > 22500 && salaire <= 30000) {\n" +
"        impots = ((salaire - 10000) * 0.2);\n" +
"        impots = impots - (impots * 0.4);\n" +
"    } else if (salaire >= 30001 && salaire <= 120000) {\n" +
"        impots = 2500 + ((salaire - 30000) * 0.3);\n" +
"    } else if (salaire >= 120001) {\n" +
"        impots = 29500 + ((salaire - 120000) * 0.35);\n" +
"    } else {\n" +
"        impots = 0.0;\n" +
"    }\n" +
"                \n" +

"    return impots.intValue();\n" +
"} \n" +
"\n" +
"MNT_943 = formule_irg("+salaire+") ;\n";
        i.eval(script);

      }

主要：

 public static void main(String[] args) throws Throwable{

            Groovy g=new Groovy();// The function mentioned below is defined in a class named Groovy
            Beanshell s=new Beanshell();// The function mentioned below is defined in a class named Beanshell


            String fileName = "c://salaires100K.txt";

            //read file into stream, try-with-resources
            try (Stream<String> stream = Files.lines(Paths.get(fileName))) {//This file contains 100'000 Salary, means 100'000 lines

                stream.forEach( n->{
                    try {
                      g.calcule_irg(Double.parseDouble(n));//I use either this 
                      //s.calcule_irg(Double.parseDouble(n));//Or this
                    } catch (Throwable ex) {
                        Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
                    }
                });

            } catch (IOException e) {
                e.printStackTrace();
            }

        }

解决方法:

你最好使用Groovy 2编译的静态功能

Since version 2, Groovy can also be compiled statically, offering type inference, and performance near that of Java

在您的情况下,每次迭代调用循环外的相同脚本：

compiledScript = ((Compilable) scriptEngine).compile(script);
compiledScript.eval(binding);

脚本也可以标记为CompileStatic,例如：

import groovy.transform.CompileStatic

@CompileStatic
int squarePlusOne(int num) {
   num * num + 1
}

assert squarePlusOne(3) == 10