JAVA-表达式解析&；评价图书馆_Java_Expression

JAVA-表达式解析&；评价图书馆

java

JAVA-表达式解析&；评价图书馆,java,expression,Java,Expression,我正在寻找一个JAVA库来解析和计算表达式。我搜索并尝试了一些库，比如Apache的JEXL和Jeval，但它们并不是我所需要的我的要求：支持所有值类型（即int、double、boolean、String等）支持所有已知的数学和逻辑运算符（+、-、*，，如果找不到实际的Java表达式求值库，您可以选择以下几种解决方案：使用XPath计算表达式。优点：XPath知道逻辑运算符，您可以使用Xalan的扩展实现变量和自定义函数缺点：XPath的类型比Java少使用JavaScri

我正在寻找一个JAVA库来解析和计算表达式。我搜索并尝试了一些库，比如Apache的JEXL和Jeval，但它们并不是我所需要的

我的要求：

支持所有值类型（即int、double、boolean、String等）

支持所有已知的数学和逻辑运算符（+、-、*，，如果找不到实际的Java表达式求值库，您可以选择以下几种解决方案：

使用XPath计算表达式。
- 优点：XPath知道逻辑运算符，您可以使用Xalan的扩展实现变量和自定义函数
- 缺点：XPath的类型比Java少
使用JavaScript计算表达式。
- 优点：Javascript非常灵活，在您的需求紧张时仍然适用。您也可以使用Javascript实现变量和自定义函数
- 缺点：Javascript的类型比Java少
使用JSP的表达式语言评估表达式（例如，使用）

就像建议的那样，您可以使用JavaScript。但您也可以看看哪些支持您的需求。

试试。这是一个运行时内存编译器，可以用作表达式计算器。也许这对您来说是正确的。您可以试试-它支持您的大部分需求：

它基于double，因此支持int，另外还支持布尔值为true=1和false=0。不幸的是，不支持字符串

布尔值示例：

import org.mariuszgromada.math.mxparser.*;
...
...
Constant T = new Constant("T = 1");
Constant F = new Constant("F = 0");
Expression e = new Expression("T && (F || (F && T))", T, F);
System.out.println(e.getExpressionString() + " = " + e.calculate());

结果:

T && (F || (F && T)) = 0.0

Help content: 

    2. +                   <Operator>              addition
    3. -                   <Operator>              subtraction
    4. *                   <Operator>              multiplication
    5. /                   <Operator>              division
    6. ^                   <Operator>              exponentiation
    7. !                   <Operator>              factorial
    8. #                   <Operator>              modulo function
    9. &                   <Boolean Operator>      logical conjunction (AND)
   10. &&                  <Boolean Operator>      logical conjunction (AND)
   11. /\                  <Boolean Operator>      logical conjunction (AND)
   12. ~&                  <Boolean Operator>      NAND - Sheffer stroke
   13. ~&&                 <Boolean Operator>      NAND - Sheffer stroke
   14. ~/\                 <Boolean Operator>      NAND - Sheffer stroke
   15. |                   <Boolean Operator>      logical disjunction (OR)
   16. ||                  <Boolean Operator>      logical disjunction (OR)
   17. \/                  <Boolean Operator>      logical disjunction (OR)
   18. ~|                  <Boolean Operator>      logical NOR
   19. ~||                 <Boolean Operator>      logical NOR
   20. ~\/                 <Boolean Operator>      logical NOR
   21. (+)                 <Boolean Operator>      exclusive or (XOR)
   22. -->                 <Boolean Operator>      implication (IMP)
   23. <--                 <Boolean Operator>      converse implication (CIMP)
   24. -/>                 <Boolean Operator>      material nonimplication (NIMP)
   25. </-                 <Boolean Operator>      converse nonimplication (CNIMP)
   26. <->                 <Boolean Operator>      logical biconditional (EQV)
   27. ~                   <Boolean Operator>      negation
   28. ¬                   <Boolean Operator>      negation
  162. add                 <Variadic Function>     (2.4) Summation operator add(a1,a2,a3,...,an)
  168. sum                 <Calculus Operator>     summation operator (SIGMA) sum(i, from, to, f(i,...))
  169. prod                <Calculus Operator>     product operator (PI) prod(i, from, to, f(i,...))
  170. int                 <Calculus Operator>     definite integral operator ( int(f(x,...), x, a, b) )
  171. der                 <Calculus Operator>     derivative operator ( der(f(x,...), x) ) 
  172. der-                <Calculus Operator>     left derivative operator ( der-(f(x,...), x) ) 
  173. der+                <Calculus Operator>     right derivative operator ( der+(f(x,...), x) ) 
  174. dern                <Calculus Operator>     n-th derivative operator ( dern(f(x,...), x) ) 
  175. diff                <Calculus Operator>     forward difference operator
  176. difb                <Calculus Operator>     backward difference operator
  177. avg                 <Calculus Operator>     (2.4) Average operator avg(i, from, to, f(i,...))
  178. vari                <Calculus Operator>     (2.4) Bias-corrected sample variance operator vari(i, from, to, f(i,...))
  179. stdi                <Calculus Operator>     (2.4) Bias-corrected sample standard deviation operator stdi(i, from, to, f(i,...))
  180. mini                <Calculus Operator>     (2.4) Minimum value mini(i, from, to, f(i,...))
  181. maxi                <Calculus Operator>     (2.4) Maximum value maxi(i, from, to, f(i,...))
  182. solve               <Calculus Operator>     (4.0) f(x) = 0 equation solving, function root finding: solve( f(x,...), x, a, b )
  301. @~                  <Bitwise Operator>      (4.0) Bitwise unary complement
  302. @&                  <Bitwise Operator>      (4.0) Bitwise AND
  303. @^                  <Bitwise Operator>      (4.0) Bitwise exclusive OR
  304. @|                  <Bitwise Operator>      (4.0) Bitwise inclusive OR
  305. @<<                 <Bitwise Operator>      (4.0) Signed left shift
  306. @>>                 <Bitwise Operator>      (4.0) Signed right shift

x/y = 5.0

mXparser对运算符、函数等有广泛的支持。请检查。您可以在库中使用帮助功能

例如：

import org.mariuszgromada.math.mxparser.*;
...
...
mXparser.consolePrintHelp("operator");

import org.mariuszgromada.math.mxparser.*;
...
...
Argument x = new Argument("x = 10");
Constant y = new Constant("y = 2");
Expression e = new Expression("x/y", x, y);
System.out.println(e.getExpressionString() + " = " + e.calculate());

结果:

T && (F || (F && T)) = 0.0

Help content: 

    2. +                   <Operator>              addition
    3. -                   <Operator>              subtraction
    4. *                   <Operator>              multiplication
    5. /                   <Operator>              division
    6. ^                   <Operator>              exponentiation
    7. !                   <Operator>              factorial
    8. #                   <Operator>              modulo function
    9. &                   <Boolean Operator>      logical conjunction (AND)
   10. &&                  <Boolean Operator>      logical conjunction (AND)
   11. /\                  <Boolean Operator>      logical conjunction (AND)
   12. ~&                  <Boolean Operator>      NAND - Sheffer stroke
   13. ~&&                 <Boolean Operator>      NAND - Sheffer stroke
   14. ~/\                 <Boolean Operator>      NAND - Sheffer stroke
   15. |                   <Boolean Operator>      logical disjunction (OR)
   16. ||                  <Boolean Operator>      logical disjunction (OR)
   17. \/                  <Boolean Operator>      logical disjunction (OR)
   18. ~|                  <Boolean Operator>      logical NOR
   19. ~||                 <Boolean Operator>      logical NOR
   20. ~\/                 <Boolean Operator>      logical NOR
   21. (+)                 <Boolean Operator>      exclusive or (XOR)
   22. -->                 <Boolean Operator>      implication (IMP)
   23. <--                 <Boolean Operator>      converse implication (CIMP)
   24. -/>                 <Boolean Operator>      material nonimplication (NIMP)
   25. </-                 <Boolean Operator>      converse nonimplication (CNIMP)
   26. <->                 <Boolean Operator>      logical biconditional (EQV)
   27. ~                   <Boolean Operator>      negation
   28. ¬                   <Boolean Operator>      negation
  162. add                 <Variadic Function>     (2.4) Summation operator add(a1,a2,a3,...,an)
  168. sum                 <Calculus Operator>     summation operator (SIGMA) sum(i, from, to, f(i,...))
  169. prod                <Calculus Operator>     product operator (PI) prod(i, from, to, f(i,...))
  170. int                 <Calculus Operator>     definite integral operator ( int(f(x,...), x, a, b) )
  171. der                 <Calculus Operator>     derivative operator ( der(f(x,...), x) ) 
  172. der-                <Calculus Operator>     left derivative operator ( der-(f(x,...), x) ) 
  173. der+                <Calculus Operator>     right derivative operator ( der+(f(x,...), x) ) 
  174. dern                <Calculus Operator>     n-th derivative operator ( dern(f(x,...), x) ) 
  175. diff                <Calculus Operator>     forward difference operator
  176. difb                <Calculus Operator>     backward difference operator
  177. avg                 <Calculus Operator>     (2.4) Average operator avg(i, from, to, f(i,...))
  178. vari                <Calculus Operator>     (2.4) Bias-corrected sample variance operator vari(i, from, to, f(i,...))
  179. stdi                <Calculus Operator>     (2.4) Bias-corrected sample standard deviation operator stdi(i, from, to, f(i,...))
  180. mini                <Calculus Operator>     (2.4) Minimum value mini(i, from, to, f(i,...))
  181. maxi                <Calculus Operator>     (2.4) Maximum value maxi(i, from, to, f(i,...))
  182. solve               <Calculus Operator>     (4.0) f(x) = 0 equation solving, function root finding: solve( f(x,...), x, a, b )
  301. @~                  <Bitwise Operator>      (4.0) Bitwise unary complement
  302. @&                  <Bitwise Operator>      (4.0) Bitwise AND
  303. @^                  <Bitwise Operator>      (4.0) Bitwise exclusive OR
  304. @|                  <Bitwise Operator>      (4.0) Bitwise inclusive OR
  305. @<<                 <Bitwise Operator>      (4.0) Signed left shift
  306. @>>                 <Bitwise Operator>      (4.0) Signed right shift

x/y = 5.0

结果:

T && (F || (F && T)) = 0.0

Help content: 

    2. +                   <Operator>              addition
    3. -                   <Operator>              subtraction
    4. *                   <Operator>              multiplication
    5. /                   <Operator>              division
    6. ^                   <Operator>              exponentiation
    7. !                   <Operator>              factorial
    8. #                   <Operator>              modulo function
    9. &                   <Boolean Operator>      logical conjunction (AND)
   10. &&                  <Boolean Operator>      logical conjunction (AND)
   11. /\                  <Boolean Operator>      logical conjunction (AND)
   12. ~&                  <Boolean Operator>      NAND - Sheffer stroke
   13. ~&&                 <Boolean Operator>      NAND - Sheffer stroke
   14. ~/\                 <Boolean Operator>      NAND - Sheffer stroke
   15. |                   <Boolean Operator>      logical disjunction (OR)
   16. ||                  <Boolean Operator>      logical disjunction (OR)
   17. \/                  <Boolean Operator>      logical disjunction (OR)
   18. ~|                  <Boolean Operator>      logical NOR
   19. ~||                 <Boolean Operator>      logical NOR
   20. ~\/                 <Boolean Operator>      logical NOR
   21. (+)                 <Boolean Operator>      exclusive or (XOR)
   22. -->                 <Boolean Operator>      implication (IMP)
   23. <--                 <Boolean Operator>      converse implication (CIMP)
   24. -/>                 <Boolean Operator>      material nonimplication (NIMP)
   25. </-                 <Boolean Operator>      converse nonimplication (CNIMP)
   26. <->                 <Boolean Operator>      logical biconditional (EQV)
   27. ~                   <Boolean Operator>      negation
   28. ¬                   <Boolean Operator>      negation
  162. add                 <Variadic Function>     (2.4) Summation operator add(a1,a2,a3,...,an)
  168. sum                 <Calculus Operator>     summation operator (SIGMA) sum(i, from, to, f(i,...))
  169. prod                <Calculus Operator>     product operator (PI) prod(i, from, to, f(i,...))
  170. int                 <Calculus Operator>     definite integral operator ( int(f(x,...), x, a, b) )
  171. der                 <Calculus Operator>     derivative operator ( der(f(x,...), x) ) 
  172. der-                <Calculus Operator>     left derivative operator ( der-(f(x,...), x) ) 
  173. der+                <Calculus Operator>     right derivative operator ( der+(f(x,...), x) ) 
  174. dern                <Calculus Operator>     n-th derivative operator ( dern(f(x,...), x) ) 
  175. diff                <Calculus Operator>     forward difference operator
  176. difb                <Calculus Operator>     backward difference operator
  177. avg                 <Calculus Operator>     (2.4) Average operator avg(i, from, to, f(i,...))
  178. vari                <Calculus Operator>     (2.4) Bias-corrected sample variance operator vari(i, from, to, f(i,...))
  179. stdi                <Calculus Operator>     (2.4) Bias-corrected sample standard deviation operator stdi(i, from, to, f(i,...))
  180. mini                <Calculus Operator>     (2.4) Minimum value mini(i, from, to, f(i,...))
  181. maxi                <Calculus Operator>     (2.4) Maximum value maxi(i, from, to, f(i,...))
  182. solve               <Calculus Operator>     (4.0) f(x) = 0 equation solving, function root finding: solve( f(x,...), x, a, b )
  301. @~                  <Bitwise Operator>      (4.0) Bitwise unary complement
  302. @&                  <Bitwise Operator>      (4.0) Bitwise AND
  303. @^                  <Bitwise Operator>      (4.0) Bitwise exclusive OR
  304. @|                  <Bitwise Operator>      (4.0) Bitwise inclusive OR
  305. @<<                 <Bitwise Operator>      (4.0) Signed left shift
  306. @>>                 <Bitwise Operator>      (4.0) Signed right shift

x/y = 5.0

另外，请检查：a）、b）

完全支持用户定义的功能

示例1-在运行时中定义的主体：

import org.mariuszgromada.math.mxparser.*; ... ... Function f = new Function("f(x,y) = x*y"); Expression e = new Expression("20-f(2,5)",f); System.out.println(e.getExpressionString() + " = " + e.calculate());
结果1

20-f(2,5) = 10.0
示例2-通过您自己的实现扩展的主体：

import org.mariuszgromada.math.mxparser.*; ... ... /* * Implementing FunctionExtension interface */ public class Addition implements FunctionExtension { double x; double y; public Addition() { x = Double.NaN; y = Double.NaN; } public Addition(double x, double y) { this.x = x; this.y = y; } public int getParametersNumber() { return 2; } public void setParameterValue(int argumentIndex, double argumentValue) { if (argumentIndex == 0) x = argumentValue; if (argumentIndex == 1) y = argumentValue; } public double calculate(double... params) { return x+y; } public FunctionExtension clone() { return new Addition(x, y); } } /* * Creating extended function */ Function f = new Function("f", new Addition()); mXparser.consolePrintln("f.calculate(1,2) = " + f.calculate(1,2) ); /* * Using extended function in expression */ Expression e = new Expression("f(2,3)", f); System.out.println(e.getExpressionString() + " = " + e.calculate() );
结果2：

f.calculate(1,2) = 3.0 f(2,3) = 5.0
此外，值得关注整个
最近发现-如果您想尝试语法（并查看高级用例），可以下载mXparser支持的

致以最诚挚的问候
您是否考虑过内置Java脚本引擎？这确实是一个令人印象深刻的库，至少从他们声称的doSadly功能来看，pow不受其支持。@ShoaibChikate您只需编写x^y-这与pow（x，y）相同