前端之家收集整理的这篇文章主要介绍了
Java 字符串转成运算公式，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
GroovyShell 实现
public static void main(String args[]) {
Binding binding = new Binding();
binding.setVariable("F",2.5);
binding.setVariable("T",30);
binding.setVariable("A",100);
binding.setVariable("P0",1)">);
binding.setVariable("language","Groovy");
GroovyShell shell = GroovyShell(binding);
Object F1 =shell.evaluate("P1=(1+0.1 * (F/100) * T)*P0; return P1 ");
Object F2 =shell.evaluate("P1=P0*(0.055*0.20+1.0011)+A; return P1 ");
System.out.println(F1);
System.out.println(F2);
}
<dependency>
groupId>org.codehaus.groovy</artifactId>groovy-allversion>2.4.7>
>
ScriptEngine实现
main(String args[]) {
ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript");
Compilable compilable = (Compilable) engine;
Bindings bindings = engine.createBindings(); //Local级别的Binding
String script = "(1+0.1 * (F/100) * T)*P0"; 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",1)">);
bindings.put("T",1)">);
bindings.put("A",1)">);
bindings.put("P0",1)">);
Object result = JSFunction.eval(bindings);
System.out.println(result); 调用缓存着的脚本函数对象，Bindings作为参数容器传入
} catch (ScriptException e) {
e.printStackTrace();
}
}
