SpringBoot+React实现计算个人所得税
作者：葡萄城技术团队
本文将以个人所得税的计算为例,使用React+SpringBoot+GcExcel来实现这一功能,文中的示例代码讲解详细,具有一定的学习价值,感兴趣的小伙伴可以了解下
前言
在报表数据处理中，Excel公式拥有强大而多样的功能，广泛应用于各个业务领域。无论是投资收益计算、财务报表编制还是保险收益估算，Excel公式都扮演着不可或缺的角色。传统的做法是直接依赖Excel来实现复杂的业务逻辑，并生成相应的Excel文件。因此只需在预设位置输入相应参数，Excel公式即可被激活，迅速计算并呈现结果。正因如此，在这类场景中，企业积累了大量用于计算的Excel文件，它们已经成为了无价的财富。
然而，传统的Excel文件方式存在难以管理和数据不安全的缺点。为了解决这些问题，可以采用B/S架构+Excel组件库的方式。
本文将以个人所得税的计算为例，使用React+Spring Boot+GcExcel来实现。首先准备好Excel文件，按照国家税务总局提供的个税计算页面进行创建。
个人所得税的收入类型有8种：
- 工资薪金所得
- 年终奖所得
- 劳务报酬所得
- 个体工商户、生产经营所得
- 酬劳所得
- 偶然所得
- 利息、股息、红利所得
- 财产转让所得
其中，工资薪金所得最为复杂，包括社会保险和专项扣除。每种类型的计税方式都不同，为了便于理解，我们为每个类型创建了一个工作表进行计算。
以下是准备好的Excel文件，其中蓝色部分为需要输入参数的单元格，其他单元格将自动计算。
完成准备工作后，下面开始前后端工程的搭建。
实践
前端 React
创建React工程
新建一个文件夹，如TaxCalculator，进入文件夹，在资源管理器的地址栏里输入cmd，然后回车，打开命令行窗口。使用下面的代码创建名为client-app的react app。
npx create-react-app salary-client
进入刚创建的salary-client文件夹，使用IDE，比如VisualStudio Code打开文件夹。
界面部分
个人所得税涉及的收入类型一共有8种，其中（“酬劳所得”，“偶然所得”，“利息、股息、红利所得”，“财产转让所得”）四种的计算方式接近，UI布局相似，借助React的component特性，最终需要提供5种表单界面。
如下图所示：
为了让UI看起来更好看一些，可以先引入一个UI框架，这里我们使用了MUI。
npm install @mui/material @emotion/react @emotion/styled
首先，更新Src/App.js的代码，其中添加了DarkMode的Theme, 代码如下：
import './App.css';
import { ThemeProvider } from '@emotion/react';
import { createTheme } from '@mui/material';
import { FormContainer } from './Component/FormContainer';
const darkTheme = createTheme({
palette: {
mode: 'dark',
},
});
function App() {
return (
<ThemeProvider theme={darkTheme}>
<div className="App-header">
<h2>个人所得税计算器</h2>
<FormContainer></FormContainer>
</div>
</ThemeProvider>
);
}
export default App;可以看到，App.js中引用了FormContainer，下来添加 ./Component/FormContainer.js。
FormContainer主要是提供一个Selector，让用户选择收入类型，根据选择的类型渲染不同的组件。
import React, { useState } from 'react';
import { SalaryIncome } from "./SalaryIncome"
import { NativeSelect, FormControl } from '@mui/material';
import { BounsIncome } from './BounsIncome';
import { CommercialIncome } from './CommercialIncome';
import { LaborIncome } from './LaborIncome';
import { OtherIncome } from './OtherIncome';
export const FormContainer = () => {
const [calcType, setCalcType] = useState("工资薪金所得");
const GetIncomeControl = () => {
switch (calcType) {
case "工资薪金所得":
return <SalaryIncome calcType={calcType}></SalaryIncome>;
case "年终奖所得":
return <BounsIncome calcType={calcType}></BounsIncome>;
case "劳务报酬所得":
return <LaborIncome calcType={calcType}></LaborIncome>;
case "个体工商户、生产经营所得":
return <CommercialIncome calcType={calcType}></CommercialIncome>;
default:
return <OtherIncome calcType={calcType}></OtherIncome>;
}
}
return (
<div style={{ width: "60vw", marginTop: "5vh" }}>
<FormControl fullWidth sx={{ marginBottom: 2 }}>
<NativeSelect labelId="demo-simple-select-label" id="demo-simple-select"
value={calcType} label="类型" onChange={e => setCalcType(e.target.value)} >
<option value="工资薪金所得">工资薪金所得</option>
<option value="年终奖所得">年终奖所得</option>
<option Item value="劳务报酬所得">劳务报酬所得</option>
<option value="个体工商户、生产经营所得">个体工商户、生产经营所得</option>
<option value="酬劳所得">酬劳所得</option>
<option value="偶然所得">偶然所得</option>
<option value="利息、股息、红利所得">利息、股息、红利所得</option>
</NativeSelect>
</FormControl>
{GetIncomeControl()}
</div>);
}例如：\<SalaryIncome calcType={calcType}\>\</SalaryIncome\>; 同时会将calcType传递进去。
接下来，分别创建几个xxxIncome组件。
1.工资薪金所得 SalaryIncome.js
import React, { useState } from 'react';
import { TextField, Button, Stack } from '@mui/material';
import axios from 'axios';
export const SalaryIncome = (props) => {
const [income, setIncome] = useState("");
const [insurance, setInsurance] = useState("");
const [childEdu, setChildEdu] = useState("");
const [selfEdu, setSelfEdu] = useState("");
const [treatment, setTreatment] = useState("");
const [loans, setLoans] = useState("");
const [rent, setRent] = useState("");
const [elder, setElder] = useState("");
const [taxableIncome, setTaxableIncome] = useState("");
const [taxRate, setTaxRate] = useState("");
const [deduction, setDeduction] = useState("");
const [tax, setTax] = useState("");
const [takeHomeSalary, setTakeHomeSalary] = useState("");
async function calculateTax(event) {
event.preventDefault();
let res = await axios.post("api/calcPersonTax", {
calcType: props.calcType,
income: income,
insurance: insurance,
childEdu: childEdu,
selfEdu: selfEdu,
treatment: treatment,
loans: loans,
rent: rent,
elder: elder,
});
if (res != null) {
let data = res.data;
setTaxableIncome(data.taxableIncome);
setTaxRate(data.taxRate);
setDeduction(data.deduction);
setTax(data.tax);
setTakeHomeSalary(data.takeHomeSalary);
}
}
function reset(event) {
event.preventDefault();
setIncome("");
setInsurance("");
setChildEdu("");
setSelfEdu("");
setTreatment("");
setLoans("");
setRent("");
setElder("");
setTaxableIncome("");
setTaxRate("");
setDeduction("");
setTax("");
setTakeHomeSalary("");
}
return (
<div>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='primary'
label="税前工资" onChange={e => setIncome(e.target.value)}
value={income} fullWidth required size="small"/>
<TextField type="text" variant='outlined' color='secondary'
label="社会保险/公积金" onChange={e => setInsurance(e.target.value)}
value={insurance} fullWidth size="small"/>
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary'
label="子女教育专项扣除" onChange={e => setChildEdu(e.target.value)}
value={childEdu} fullWidth size="small"/>
<TextField type="text" variant='outlined' color='secondary'
label="继续教育专项扣除" onChange={e => setSelfEdu(e.target.value)}
value={selfEdu} fullWidth size="small"/>
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary'
label="大病医疗专项扣除" onChange={e => setTreatment(e.target.value)}
value={treatment} fullWidth size="small"/>
<TextField type="text" variant='outlined' color='secondary'
label="住房贷款利息专项扣除" onChange={e => setLoans(e.target.value)}
value={loans} fullWidth size="small"/>
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary'
label="住房租金专项扣除" onChange={e => setRent(e.target.value)}
value={rent} fullWidth size="small"/>
<TextField type="text" variant='outlined' color='secondary'
label="赡养老人专项扣除" onChange={e => setElder(e.target.value)}
value={elder} fullWidth size="small"/>
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary'
label="起征点" value="5000 元/月" fullWidth disabled size="small"/>
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<Button variant="outlined" color="primary" onClick={calculateTax} fullWidth size="large">计算</Button>
<Button variant="outlined" color="secondary" onClick={reset} fullWidth size="large">重置</Button>
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary'
label="应纳税所得额" value={taxableIncome} fullWidth disabled size="small"/>
<TextField type="text" variant='outlined' color='secondary'
label="税率" value={taxRate} fullWidth disabled size="small"/>
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary'
label="速算扣除数" value={deduction} fullWidth disabled size="small"/>
<TextField type="text" variant='outlined' color='secondary'
label="应纳税额" value={tax} fullWidth disabled size="small"/>
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary'
label="税后工资" value={takeHomeSalary} fullWidth disabled size="small"/>
</Stack>
</div>
)
}2.年终奖金所得 BounsIncome.js
import React, { useState } from 'react';
import { TextField, Button, Stack } from '@mui/material';
import axios from 'axios';
export const BounsIncome = (props) => {
const [income, setIncome] = useState("");
const [taxableIncome, setTaxableIncome] = useState("");
const [taxRate, setTaxRate] = useState("");
const [deduction, setDeduction] = useState("");
const [monthlyWage, setMonthlyWage] = useState("");
const [tax, setTax] = useState("");
const [takeHomeSalary, setTakeHomeSalary] = useState("");
async function calculateTax(event) {
event.preventDefault();
let res = await axios.post("api/calcPersonTax", {
calcType: props.calcType,
income: income,
});
if (res != null) {
let data = res.data;
setTaxableIncome(data.taxableIncome);
setTaxRate(data.taxRate);
setDeduction(data.deduction);
setMonthlyWage(data.monthlyWage);
setTax(data.tax);
setTakeHomeSalary(data.takeHomeSalary);
}
}
function reset(event) {
event.preventDefault();
setIncome("");
setTaxableIncome("");
setTaxRate("");
setDeduction("");
setMonthlyWage("");
setTax("");
setTakeHomeSalary("");
}
return (
<div>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='primary' size="small"
label="税前工资" onChange={e => setIncome(e.target.value)}
value={income} fullWidth required />
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<Button variant="outlined" color="primary" onClick={calculateTax} fullWidth size="large">计算</Button>
<Button variant="outlined" color="secondary" onClick={reset} fullWidth size="large">重置</Button>
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="应纳税所得额" value={taxableIncome} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="税率" value={taxRate} fullWidth disabled />
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="速算扣除数" value={deduction} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="平均每月工资" value={monthlyWage} fullWidth disabled />
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="应纳税额" value={tax} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="税后工资" value={takeHomeSalary} fullWidth disabled />
</Stack>
</div>
)
}3.劳务报酬所得 LaborIncome.js
import React, { useState } from 'react';
import { TextField, Button, Stack } from '@mui/material';
import axios from 'axios';
export const LaborIncome = (props) => {
const [income, setIncome] = useState("");
const [taxableIncome, setTaxableIncome] = useState("");
const [taxRate, setTaxRate] = useState("");
const [deduction, setDeduction] = useState("");
const [nonTaxablePart, setNonTaxablePart] = useState("");
const [tax, setTax] = useState("");
const [takeHomeSalary, setTakeHomeSalary] = useState("");
async function calculateTax(event) {
event.preventDefault();
let res = await axios.post("api/calcPersonTax", {
calcType: props.calcType,
income: income,
});
if (res != null) {
let data = res.data;
setTaxableIncome(data.taxableIncome);
setTaxRate(data.taxRate);
setDeduction(data.deduction);
setNonTaxablePart(data.nonTaxablePart);
setTax(data.tax);
setTakeHomeSalary(data.takeHomeSalary);
}
}
function reset(event) {
event.preventDefault();
setIncome("");
setTaxableIncome("");
setTaxRate("");
setDeduction("");
setNonTaxablePart("");
setTax("");
setTakeHomeSalary("");
}
return (
<div>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='primary' size="small"
label="税前工资" onChange={e => setIncome(e.target.value)}
value={income} fullWidth required />
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<Button variant="outlined" color="primary" onClick={calculateTax} fullWidth size="large">计算</Button>
<Button variant="outlined" color="secondary" onClick={reset} fullWidth size="large">重置</Button>
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="应纳税所得额" value={taxableIncome} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="税率" value={taxRate} fullWidth disabled />
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="速算扣除数" value={deduction} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="减除费用" value={nonTaxablePart} fullWidth disabled />
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="应纳税额" value={tax} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="税后工资" value={takeHomeSalary} fullWidth disabled />
</Stack>
</div>
)
}4.个体工商户、生产经营所得 CommercialIncome.js
import React, { useState } from 'react';
import { TextField, Button, Stack } from '@mui/material';
import axios from 'axios';
export const CommercialIncome = (props) => {
const [income, setIncome] = useState("");
const [taxableIncome, setTaxableIncome] = useState("");
const [taxRate, setTaxRate] = useState("");
const [deduction, setDeduction] = useState("");
const [tax, setTax] = useState("");
const [takeHomeSalary, setTakeHomeSalary] = useState("");
async function calculateTax(event) {
event.preventDefault();
let res = await axios.post("api/calcPersonTax", {
calcType: props.calcType,
income: income,
});
if (res != null) {
let data = res.data;
setTaxableIncome(data.taxableIncome);
setTaxRate(data.taxRate);
setDeduction(data.deduction);
setTax(data.tax);
setTakeHomeSalary(data.takeHomeSalary);
}
}
function reset(event) {
event.preventDefault();
setIncome("");
setTaxableIncome("");
setTaxRate("");
setDeduction("");
setTax("");
setTakeHomeSalary("");
}
return (
<div>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='primary' size="small"
label="税前工资" onChange={e => setIncome(e.target.value)}
value={income} fullWidth required />
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<Button variant="outlined" color="primary" onClick={calculateTax} fullWidth size="large">计算</Button>
<Button variant="outlined" color="secondary" onClick={reset} fullWidth size="large">重置</Button>
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="应纳税所得额" value={taxableIncome} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="税率" value={taxRate} fullWidth disabled />
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="速算扣除数" value={deduction} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="应纳税额" value={tax} fullWidth disabled />
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="税后工资" value={takeHomeSalary} fullWidth disabled />
</Stack>
</div>
)
}5.余下四种类型 OtherIncome.js
import React, { useState } from 'react';
import { TextField, Button, Stack } from '@mui/material';
import axios from 'axios';
export const OtherIncome = (props) => {
const [income, setIncome] = useState("");
const [taxableIncome, setTaxableIncome] = useState("");
const [taxRate, setTaxRate] = useState("");
const [tax, setTax] = useState("");
const [takeHomeSalary, setTakeHomeSalary] = useState("");
async function calculateTax(event) {
event.preventDefault();
let res = await axios.post("api/calcPersonTax", {
calcType: props.calcType,
income: income,
});
if (res != null) {
let data = res.data;
setTaxableIncome(data.taxableIncome);
setTaxRate(data.taxRate);
setTax(data.tax);
setTakeHomeSalary(data.takeHomeSalary);
}
}
function reset(event) {
event.preventDefault();
setIncome("");
setTaxableIncome("");
setTaxRate("");
setTax("");
setTakeHomeSalary("");
}
return (
<div>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='primary' size="small"
label={props.calcType} onChange={e => setIncome(e.target.value)}
value={income} fullWidth required />
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<Button variant="outlined" color="primary" onClick={calculateTax} fullWidth size="large">计算</Button>
<Button variant="outlined" color="secondary" onClick={reset} fullWidth size="large">重置</Button>
</Stack>
<hr></hr>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="应纳税所得额" value={taxableIncome} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="税率" value={taxRate} fullWidth disabled />
</Stack>
<Stack spacing={2} direction="row" sx={{ marginBottom: 2 }}>
<TextField type="text" variant='outlined' color='secondary' size="small"
label="应纳税额" value={tax} fullWidth disabled />
<TextField type="text" variant='outlined' color='secondary' size="small"
label="税后工资" value={takeHomeSalary} fullWidth disabled />
</Stack>
</div>
)
}此时，完成UI部分后，可以尝试运行起来，效果如下：
//通过代码运行React app npm start
可以试着填一些数据，但是当我们点击计算时会报错，这是因为服务端还没有准备好。
前端请求部分
熟悉Axios的同学可以跳过这部分，前面的代码里，已经给出了Axois发送请求的代码。
可以看到无论是哪一种类型的组件，请求都发送到了相同的url（"api/calcPersonTax"），以SalaryIncome为例，代码如下：
async function calculateTax(event) {
event.preventDefault();
let res = await axios.post("api/calcPersonTax", {
calcType: props.calcType,
income: income,
insurance: insurance,
childEdu: childEdu,
selfEdu: selfEdu,
treatment: treatment,
loans: loans,
rent: rent,
elder: elder,
});
if (res != null) {
let data = res.data;
setTaxableIncome(data.taxableIncome);
setTaxRate(data.taxRate);
setDeduction(data.deduction);
setTax(data.tax);
setTakeHomeSalary(data.takeHomeSalary);
}
}可以看到，整个请求变得非常简单，主要是把state的值取出来，通过post请求发送到服务端，然后根据返回值，把数据重新设给state，这样就完成UI数据的更新了。
配置请求转发中间件
我们在请求时访问的是相对地址，React本身有一个nodeJS，默认的端口是3000，而Spring Boot的默认端口是8080。前端直接访问会有跨域的问题，因此我们要做一个代理的配置。
在src文件夹下面添加文件，名为setupProxy.js，代码如下：
const { createProxyMiddleware } = require('http-proxy-middleware');
module.exports = function(app) {
app.use(
'/api',
createProxyMiddleware({
target: 'http://localhost:8080',
changeOrigin: true,
})
);
};服务端 Spring Boot
创建工程及添加依赖
使用IDEA创建一个Spring Boot工程，如果使用的是社区（community）版本，不能直接创建Spring Boot项目，那可以先创建一个空项目，idea创建project的过程，就跳过了，这里我们以创建了一个gradle项目为例。
plugins {
id 'org.springframework.boot' version '3.0.0'
id 'io.spring.dependency-management' version '1.1.0'
id 'java'
id 'war'
}
group = 'org.example'
version = '1.0-SNAPSHOT'
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'com.grapecity.documents:gcexcel:6.2.0'
implementation 'javax.json:javax.json-api:1.1.4'
providedRuntime 'org.springframework.boot:spring-boot-starter-tomcat'
testImplementation('org.springframework.boot:spring-boot-starter-test')
}
test {
useJUnitPlatform()
}在dependencies 中，我们除了依赖Spring Boot之外，还添加了GcExcel的依赖，后面导出时会用到GcExcel，目前的版本是6.2.0。
添加API
在Application类上，添加属性 @RequestMapping("/api").，并添加 calcPersonTax API。
@Spring BootApplication
@RestController
@RequestMapping("/api")
public class SalaryTaxCalculator {
public static void main(String[] args) {
SpringApplication.run(SalaryTaxCalculator.class, args);
}
@PostMapping("/calcPersonTax")
public CalcResult calcTax(@RequestBody CalcParameter par) {
Workbook workbook = new Workbook();
workbook.open(GetResourcePath());
return CalcInternal(workbook, par);
}
private String GetResourcePath(){
return Objects.requireNonNull(SalaryTaxCalculator.class.getClassLoader().getResource("PersonalTaxCalcEngine.xlsx")).getPath();
}
private CalcResult CalcInternal(Workbook workbook, CalcParameter par) {
//todo
}
}可以看到在CalcInternal方法内，我们使用GcExcel，根据calcType来判断使用哪一个sheet来进行计算。对不同Sheet只需要通过GcExcel设值，并从特定的格子里取值即可。
同时，我们还需要创建两个类，CalcParameter和CalcResult。CalcParameter用于从request中把post的data解析出来，CalcResult用于在response中返回的数据。
CalcParameter:
public class CalcParameter {
public String calcType;
public double income;
public double insurance;
public double childEdu;
public double selfEdu;
public double treatment;
public double loans;
public double rent;
public double elder;
}CalcResult:
public class CalcResult {
public double taxableIncome;
public double taxRate;
public double deduction;
public double tax;
public double takeHomeSalary;
public double monthlyWage;
public double nonTaxablePart;
}使用GcExcel完成公式计算
前面我们定义了 CalcInternal，在 CalcInternal 中，我们需要使用GcExcel来完成公式计算。
GcExcel的公式计算是自动完成的，我们使用workbook打开Excel文件后，只需要set相关的value。之后在取值时，GcExcel会自动计算响应公式的值。
private CalcResult CalcInternal(Workbook workbook, CalcParameter par) {
var result = new CalcResult();
var sheet = workbook.getWorksheets().get(par.calcType);
switch (par.calcType) {
case "工资薪金所得" -> {
sheet.getRange("B1").setValue(par.income);
sheet.getRange("D1").setValue(par.insurance);
sheet.getRange("B2").setValue(par.childEdu);
sheet.getRange("D2").setValue(par.selfEdu);
sheet.getRange("B3").setValue(par.treatment);
sheet.getRange("D3").setValue(par.loans);
sheet.getRange("B4").setValue(par.rent);
sheet.getRange("D4").setValue(par.elder);
result.taxableIncome = (double) sheet.getRange("B9").getValue();
result.taxRate = (double) sheet.getRange("D9").getValue();
result.deduction = (double) sheet.getRange("B10").getValue();
result.tax = (double) sheet.getRange("D10").getValue();
result.takeHomeSalary = (double) sheet.getRange("B11").getValue();
}
case "年终奖所得" -> {
sheet.getRange("B1").setValue(par.income);
result.taxableIncome = (double) sheet.getRange("B3").getValue();
result.taxRate = (double) sheet.getRange("D3").getValue();
result.deduction = (double) sheet.getRange("B4").getValue();
result.monthlyWage = (double) sheet.getRange("D4").getValue();
result.tax = (double) sheet.getRange("B5").getValue();
result.takeHomeSalary = (double) sheet.getRange("D5").getValue();
}
case "劳务报酬所得" -> {
sheet.getRange("B1").setValue(par.income);
result.taxableIncome = (double) sheet.getRange("B3").getValue();
result.taxRate = (double) sheet.getRange("D3").getValue();
result.deduction = (double) sheet.getRange("B4").getValue();
result.nonTaxablePart = (double) sheet.getRange("D4").getValue();
result.tax = (double) sheet.getRange("B5").getValue();
result.takeHomeSalary = (double) sheet.getRange("D5").getValue();
}
case "个体工商户、生产经营所得" -> {
sheet.getRange("B1").setValue(par.income);
result.taxableIncome = (double) sheet.getRange("B3").getValue();
result.taxRate = (double) sheet.getRange("D3").getValue();
result.deduction = (double) sheet.getRange("B4").getValue();
result.tax = (double) sheet.getRange("D4").getValue();
result.takeHomeSalary = (double) sheet.getRange("B5").getValue();
}
default -> {
sheet.getRange("B1").setValue(par.income);
result.taxableIncome = (double) sheet.getRange("B3").getValue();
result.taxRate = (double) sheet.getRange("D3").getValue();
result.tax = (double) sheet.getRange("B4").getValue();
result.takeHomeSalary = (double) sheet.getRange("D4").getValue();
}
}
return result;
}这样就完成了服务端的代码。
最终效果
我们可以使用工资薪金所得试验一下，可以看到数据被计算出来了。因为目的是为了分享服务端公式计算的方案，所以计算的结果是否正确，就不做细致考虑。
总结
个税计算的场景并不复杂，主要是通过Excel完成公式计算即可，在服务端使用GcExcel可以大幅度降低前后端的开发难度，系统的搭建过程可以完全不需要考虑计算的逻辑。
在实际的公式计算场景中，可能往往会比个税计算的场景复杂，借助GcExcel这样Excel组件库，可以很容易的把已有的Excel文件迁移到线上，提高工作效率。
另外，本文中分享的代码并不是最符合实际工作中的要求，读者还可以从以下角度去优化自己的代码。
- 收入类型可以抽成枚举，这样维护和使用起来更容易。
- 目前每一个react组件里的冗余度还不低，还可以继续抽象组件，避免重复写代码。
- 在服务端，因为公式计算的逻辑是不会变的，在实际场景中，也有可能同一时间要加载复数个Excel文件，可以考虑把workbook常驻内存，来提高性能。
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