java 自定义公式计算

// 公式计算-自定义公式
   // 公式：运维单数F*系数f1 + 运单价格T*系数t1 +总价A*系数a1 +评价P*系数P1
   /*
   * <dependency> <groupId>org.codehaus.groovy</groupId>
   * <artifactId>groovy-all</artifactId> <version>2.4.7</version> </dependency>
   */
   public static double countGrovovy() {
       Binding binding = new Binding();
       // 值
       binding.setVariable("F", 150);
       binding.setVariable("T", 60000);
       binding.setVariable("A", 300000);
       binding.setVariable("P", 10);
       // 系数
       binding.setVariable("F1", 1.2);
       binding.setVariable("T1", 1.7);
       binding.setVariable("A1", 1.2);
       binding.setVariable("P1", 0.5);

binding.setVariable("language", "Groovy");

GroovyShell shell = new GroovyShell(binding);

Object F1 = shell.evaluate("P2=F*F1 + T*T1 +A*A1 +P*P1; return P2 ");

       // Object F2 = shell.evaluate("P1=P0*(0.055*0.20+1.0011)+A; return P1 ");
       double d = (150 * 1.2) + (60000 * 1.7) + (300000 * 1.2) + (10 * 0.5);
       System.out.println("手动计算：" + d);
       System.out.println("自定义公式计算：" + F1);
       // System.out.println(F2);
       return Double.valueOf(F1.toString());
   }

   // 自定义公式2
   public static double countGrovovy2() {
       ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript");
       Compilable compilable = (Compilable) engine;
       Bindings bindings = engine.createBindings(); // Local级别的Binding
       String script = "F*F1 + T*T1 +A*A1 +P*P1"; // 定义函数并调用
       CompiledScript JSFunction = null; // 解析编译脚本函数
       try {
           JSFunction = compilable.compile(script);

           bindings.put("F", 150);
           bindings.put("T", 60000);
           bindings.put("A", 300000);
           bindings.put("P", 10);
           // 系数
           bindings.put("F1", 1.2);
           bindings.put("T1", 1.7);
           bindings.put("A1", 1.2);
           bindings.put("P1", 0.5);

Object result = JSFunction.eval(bindings);

           System.out.println("自定义公式2：==" + result); // 调用缓存着的脚本函数对象，Bindings作为参数容器传入
           return Double.valueOf(result.toString());
       } catch (javax.script.ScriptException e) {
           e.printStackTrace();
           return 0;
       }
       // return Double.valueOf(result.toString());
   }

来源：oschina

链接：https://my.oschina.net/mellen/blog/4466766

标签

groovy

java

javascript