SpringBoot 2.x 学习笔记（5）：ECharts+AJAX实现异步数据加载

一时失言乱红尘 2022-04-17 06:56 191阅读 0赞

### 1、JavaBean ###

package cn.hadron.eba.bean;
    import java.io.Serializable;
    
    public class UserBean implements Serializable{
        private String username;
        private Double salary;
    
        public UserBean(){}
    
        public UserBean(String username,Double salary){
            this.username=username;
            this.salary=salary;
        }
    
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username;
        }
    
        public Double getSalary() {
            return salary;
        }
    
        public void setSalary(Double salary) {
            this.salary = salary;
        }
    }

### 2、控制器 ###

package cn.hadron.tpa.eba.controller;
    import cn.hadron.eba.bean.UserBean;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.context.request.WebRequest;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpSession;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    @Controller
    public class IndexController {
      
    
        @RequestMapping("/ajax")
        public String echarts4(Model model){
            System.out.println("IndexController.ajax");
            return "echarts/ajax";
        }
    
        @RequestMapping("/echarts_ajax")
        @ResponseBody
        public List<UserBean> echarts_ajax(Model model){
            System.out.println("IndexController.echarts_ajax");
            List<UserBean> listM=new ArrayList<>();
            listM.add(new UserBean("Hadron",8000.0));
            listM.add(new UserBean("张三",6000.0));
            listM.add(new UserBean("李四",5000.0));
            listM.add(new UserBean("王五",6500.0));
            return listM;
        }
    }

### 3、页面 ###

<!DOCTYPE html>
    <html xmlns:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8">
        <title>测试Echarts</title>
        
        <script type="application/javascript" th:src="@{js/echarts.js}"></script>
        <script type="application/javascript" th:src="@{js/jquery-3.3.1.min.js}"></script>
    </head>
    <body>
    
    <div id="main" style="width: 800px;height:450px;"></div>
    <script type="text/javascript">
        $(document).ready(function(){
            // 基于准备好的dom，初始化echarts实例
            var myChart = echarts.init(document.getElementById('main'));
            //数据加载完之前先显示一段简单的loading动画
            myChart.showLoading();
            var names=[];    //横坐标数组（实际用来盛放X轴坐标值）
            var values=[];    //纵坐标数组（实际用来盛放Y坐标值）
            $.ajax({
                type : "post",
                async : true,            //异步请求（同步请求将会锁住浏览器，用户其他操作必须等待请求完成才可以执行）
                url : "/eba/echarts_ajax",    //请求发送到dataActiont处
                data : {},
                dataType : "json",        //返回数据形式为json
                success : function(result) {
                    //请求成功时执行该函数内容，result即为服务器返回的json对象
                    if (result) {
                        for(var i=0;i<result.length;i++){
                            names.push(result[i].username);
                            values.push(result[i].salary);
                        }
                        myChart.hideLoading();    //隐藏加载动画
                        myChart.setOption({        //加载数据图表
                            tooltip: {},
                            legend: {
                                data:['薪资']
                            },
                            xAxis: {
                                data: names
                            },
                            yAxis: {
                                type: 'value'
                            },
                            series: [{
                                // 根据名字对应到相应的系列
                                name: '薪资',//薪资 series not exists. Legend data should be same with series name or data name.
                                type: 'bar',
                                data: values
                            }]
                        });
                    }
                },
                error : function(errorMsg) {
                    //请求失败时执行该函数
                    alert("图表请求数据失败!");
                    myChart.hideLoading();
                }
            });//end ajax
        });
    
    </script>
    </body>
    </html>

### 4、运行效果 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70]: /images/20220417/b7923e9918d64e538b77bfca5f6f2d0a.png