java后端实现信息分页查询的示例代码

    // request拦截器
   service.interceptors.request.use(config => {
    // 是否需要设置 token
    // const isToken = (config.headers || {}).isToken === false
    // if (getToken() && !isToken) {
    //   config.headers['Authorization'] = 'Bearer ' + getToken() // 让每个请求携带自定义token 请根据实际情况自行修改
    // }
    // get请求映射params参数
    if (config.method === 'get' && config.params) {
      let url = config.url + '?';
      for (const propName of Object.keys(config.params)) {
        const value = config.params[propName];
        var part = encodeURIComponent(propName) + "=";
        if (value !== null && typeof(value) !== "undefined") {
          if (typeof value === 'object') {
            for (const key of Object.keys(value)) {
              let params = propName + '[' + key + ']';
              var subPart = encodeURIComponent(params) + "=";
              url += subPart + encodeURIComponent(value[key]) + "&";
            }
          } else {
            url += part + encodeURIComponent(value) + "&";
          }
        }
      }
      url = url.slice(0, -1);
      config.params = {};
      config.url = url;
    }
    return config
  }, error => {
      console.log(error)
      Promise.reject(error)
  })  

    // 响应拦截器
service.interceptors.response.use(res => {
  if (res.data.code === 0 && res.data.msg === 'NOTLOGIN') {// 返回登录页面
    console.log('---/backend/page/login/login.html---')
    localStorage.removeItem('userInfo')
    window.top.location.href = '/backend/page/login/login.html'
  } else {
    return res.data
  }
},
error => {
  console.log('err' + error)
  let { message } = error;
  if (message == "Network Error") {
    message = "后端接口连接异常";
  }
  else if (message.includes("timeout")) {
    message = "系统接口请求超时";
  }
  else if (message.includes("Request failed with status code")) {
    message = "系统接口" + message.substr(message.length - 3) + "异常";
  }
  window.ELEMENT.Message({
    message: message,
    type: 'error',
    duration: 5 * 1000
  })
  return Promise.reject(error)
}
)

/**
 * 配置MP的分页插件
 */
@Configuration //配置类注解
public class MybatisPlusConfig {

    //通过拦截器的方式将插件加载到项目
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor(){
        //创建拦截器对象
        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        //通过对象加载拦截器
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        return mybatisPlusInterceptor;
    }
}

/**
 * 员工信息的分页查询
 * @param page
 * @param pageSize
 * @param name
 * @return
 */
@GetMapping("/page")
public R<Page> page(int page,int pageSize,String name) {
    log.info("page={},pageSize={},name={}", page, pageSize, name);

    //1.构造分页构造器
    Page pageInfo = new Page<>(page, pageSize);

    //2.构造条件构造器
    LambdaQueryWrapper<Employee> queryWrapper = new LambdaQueryWrapper();
    // 2.1添加一个过滤条件
    queryWrapper.like(StringUtils.isNotEmpty(name), Employee::getName, name);
    // 2.2添加一个排序条件
    queryWrapper.orderByDesc(Employee::getUpdateTime);


    //3.执行查询
    employeeService.page(pageInfo, queryWrapper);
    return R.success(pageInfo);
}