关于后端代码实现逻辑运算

Question

模块中需要在前端实现输入两个字段值，第三个字段值会通过后段的计算代码自动计算出来传到前端。这个要在后端怎么代码呢？例如普通的两个数的求和功能dao service controller 有例子吗 springboot vue

Answer 1

演示代码：

<template>
    <div class="hello">
        <h1>{{ msg }}</h1>
        <ul>
            <label for="parameter1">参数1：</label>
            <input type="number" placeholder="请输入参数1" v-model="parameter1">
            <br />
            <label for="parameter2">参数2：</label>
            <input type="number" placeholder="请输入参数2" v-model="parameter2">
            <br />
            <button type="button" @click="test">测试</button>
            <br />
            <label for="sum">结果：</label>
            <li>{{ sum }}</li>
        </ul>
    </div>
</template>

<script>
    export default {
        name: 'HelloWorld',
        props: {
            msg: String
        },
        data() {
            return {
                parameter1: '',
                parameter2: '',
                sum: ''
            }
        },
        methods: {
            test() {
                this.$http.get('http://localhost:8090/test/getSum', {
                    params: {
                        parameter1: this.parameter1,
                        parameter2: this.parameter2
                    }
                }).then(function(res) {
                    this.sum = res.data;
                }, function(res) {
                    console.log('失败')
                })
            }
        },
    }
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
    h3 {
        margin: 40px 0 0;
    }

    ul {
        list-style-type: none;
        padding: 0;
    }

    li {
        display: inline-block;
        margin: 0 10px;
    }

    a {
        color: #42b983;
    }
</style>

@RestController
@RequestMapping("/test")
public class TesController {

    @GetMapping(value = "/getSum")
    @CrossOrigin("http://localhost:8080")
    public int getSum(@RequestParam( name = "parameter1") int parameter1,
                         @RequestParam( name = "parameter2")int parameter2) {
        return parameter1 + parameter2;
    }
}