SpringBoot分页的实现与long型id精度丢失问题的解决方案介绍

@Configuration
public class MyBatisPlusConfig {
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor(){
        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        return mybatisPlusInterceptor;
    }
}

    @GetMapping("/page")
    public R<Page> page(int page,int pageSize,String name){
        log.info("page={}, pageSize={}, name={}",page,pageSize,name);
        //构造分页构造器
        Page page1 = new Page(page, pageSize);
        //构造条件构造器
        LambdaQueryWrapper<Employee> lqw = new LambdaQueryWrapper<>();
        //分页条件
        lqw.like(StringUtils.isNotEmpty(name),Employee::getName,name);
        //添加排序
        lqw.orderByDesc(Employee::getUpdateTime);
        //执行查询
        employeeService.page(page1,lqw);
        //返回分页页面信息
        return R.success(page1);
    }

{<!--{cke_protected}{C}%3C!%2D%2D%20%2D%2D%3E-->"code":1,"msg":null,"data":{<!--{cke_protected}{C}%3C!%2D%2D%20%2D%2D%3E-->"records":[{<!--{cke_protected}{C}%3C!%2D%2D%20%2D%2D%3E-->"id":"1576900298836086785","username":"15072564960","name":"懒羊羊","passsword":"e10adc3949ba59abbe56e057f20f883e","phone":"15072564960","sex":"1","idNumber":"420528200201151015","status":0,"createTime":"2022-10-03 19:41:43","updateTime":"2022-10-06 23:01:27","createUser":"1","updateUser":"1"},{<!--{cke_protected}{C}%3C!%2D%2D%20%2D%2D%3E-->"id":"1576934844579266561","username":"24553880","name":"懒羊羊","passsword":"e10adc3949ba59abbe56e057f20f883e","phone":"15072564960","sex":"1","idNumber":"420528200201151015","status":1,"createTime":"2022-10-03 21:59:00","updateTime":"2022-10-06 23:01:17","createUser":"1","updateUser":"1"}],"total":4,"size":2,"current":1,"orders":[],"optimizeCountSql":true,"hitCount":false,"countId":null,"maxLimit":null,"searchCount":true,"pages":2},"map":{<!--{cke_protected}{C}%3C!%2D%2D%20%2D%2D%3E-->}}

    @PutMapping
    public R<String> update(HttpServletRequest request, @RequestBody Employee employee) {
        log.info(employee.toString());
        employee.setUpdateTime(LocalDateTime.now());
        Long empID=(Long) request.getSession().getAttribute("employee");
        employee.setUpdateUser(empID);
        employeeService.updateById(employee);
        return R.success("员工信息修改成功");
    }

public class JacksonObjectMapper extends ObjectMapper {
    public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
    public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
    public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";
    public JacksonObjectMapper() {
        super();
        //收到未知属性时不报异常
        this.configure(FAIL_ON_UNKNOWN_PROPERTIES, false);
        //反序列化时，属性不存在的兼容处理
        this.getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        SimpleModule simpleModule = new SimpleModule()
                .addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                .addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                .addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)))
                .addSerializer(BigInteger.class, ToStringSerializer.instance)
                .addSerializer(Long.class, ToStringSerializer.instance)//将Long转换成String
                .addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                .addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                .addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));
        //注册功能模块 例如，可以添加自定义序列化器和反序列化器
        this.registerModule(simpleModule);
    }
}

   /**
     * 扩展mvc框架的消息转换器组件
     */
    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        //创建消息转换器对象
        MappingJackson2HttpMessageConverter mj2mc = new MappingJackson2HttpMessageConverter();
        //设置对象转换器，底层使用Jackson将Java对象转为json
        mj2mc.setObjectMapper(new JacksonObjectMapper());
        //将上述的消息转换器对象追加到mvc框架的转换器集合中
        converters.add(0,mj2mc);//确定顺序，将自己使用的转换器放在最前面来优先使用
    }