1.引入相关依赖

            
                
     
      com.baomidou
                 
     
      mybatis-plus-boot-starter
                 
     
      ${mybatisplus.version}
             
     		
            
                
     
      org.projectlombok
                 
     
      lombok
                 
     
      true
             
    

2.我们以查询省份疫情数据，数量为例做一个echarts疫情数据填充

NameNumber.java

@Data@AllArgsConstructor@NoArgsConstructorpublic class NameNumber {    @JsonProperty("value") //echarts 要求返回的名称，要不封装不上数据    private int number;    @JsonProperty("name") //echarts 要求返回的名称，要不封装不上数据    private String goodsname;}

3.PieVo.java 用来返回json数据的实体，里面装着List<NameNumber>

@Data@NoArgsConstructor@AllArgsConstructorpublic class PieVo {    private List
    
      nameNumberList;}
    

4.EchartsController.java

@RestController@RequestMapping("/echarts")public class EchartsController {    @Autowired    PieMapper pieMapper;    @RequestMapping("/pie")    public PieVo loadAll(){        PieVo pieVo = new PieVo();       List
    
      pieVoList =  pieMapper.findNameNumber();       pieVo.setNameNumberList(pieVoList);       return pieVo;    }}
    

5.PieMapper.java

@Mapperpublic interface PieMapper {	    @Select("select goodsname,number from bus_goods")    public List
    
      findNameNumber();}
    

6.echarts中国疫情地图页面