layui框架与SSM前后台交互的方法

Z时代
2024-01-10
分类：综合

采用layui前台框架实现前后台交互，数据分页显示以及删除操作，具体方式如下：

一、数据分页显示

1.前端

（1）html页面


<!--轮播数据分页显示-->
<table class="layui-hide" id="content_lbt" lay-filter="content_lbt_filter"></table>

（2）请求渲染数据


$(function() {
 /*轮播数据分页显示*/
 layui.use(['table', 'update'], function() {
 var table = layui.table,
  upload = layui.upload;
 table.render({
  elem: '#content_lbt',
  height: 500
  //,url: 'data/content_lbt.json' //数据接口
  ,
  url: 'http://localhost:9911/cms/queryCarouselList' //数据接口
  ,
  page: true //开启分页
  ,
  loading: true,//分页查询是否显示等待图标
  text: {//若查询记录为空，执行此操作
  none: '暂无相关数据'
  } //默认：无数据。注：该属性为 layui 2.2.5 开始新增
  ,
  cellMinWidth: 80 //全局定义常规单元格的最小宽度，layui 2.2.1 新增
  ,
  cols: [
  [{
   field: 'id',
   width: '10%',
   title: 'ID',
   sort: true
  }, {
   field: 'posterId',
   width: '10%',
   title: '上传者ID',
   sort: true
  }, {
   field: 'posterName',
   width: '15%',
   title: '上传者姓名'
  }, {
   field: 'description',
   width: '28%',
   title: '描述',
   minWidth: 200
  }, {
   field: 'photoPath',
   width: '10%',
   title: '图片',
   minWidth: 100
  }, {
   field: 'createTime',
   width: '10%',
   title: '上传时间',
   minWidth: 100
  }]
  ],
  request: {
  pageName: 'page',
  limitName: 'size'
  },
  limit: 10,
  limits: [10, 20, 30, 40, 50]
 });
   });

2.后端

后端采用SpringBoot，利用SSM框架

（1）mapper：（注意@Mapper注解）


/**
   * 查询所有轮播图信息
   *
   * @return
   */
  List<Carousel> queryCarousel(@Param("start") Integer start, @Param("size") Integer size);
  /**
   * 查询轮播记录条数
   *
   * @return
   */
  Integer countCarousel();

注意po类采用驼峰式写法


<select id="queryCarousel" resultType="com.jingling.basic.po.Carousel">
     SELECT id, poster_id AS posterId, poster_name AS posterName, description AS description , photo_path AS photoPath, create_time AS createTime
     FROM carousel
     LIMIT #{start}, #{size}
  </select>
  <select id="countCarousel" resultType="int">
    SELECT COUNT(*) FROM carousel
  </select>

（2）service


  /**
   * 查询全部轮播信息
   *
   * @return
   */
  List<Carousel> queryCarousel(Integer page,Integer size);
  /**
   * 查询轮播记录条数
   *
   * @return
   */
  Integer countCarousel();

（3）serviceImpl（注意要有@Service注解）


 @Autowired
  private CarouselMapper carouselMapper;
  @Override
  public List<Carousel> queryCarousel(Integer page,Integer size) {
    if(page == null || page <= 0){
      page = 1;
    }
    if (size == null || size <= 0){
      size = 10;
    }
    Integer start = (page - 1) * size;
    return carouselMapper.queryCarousel(start,size);
  }
  @Override
  public Integer countCarousel() {
    return carouselMapper.countCarousel();
  }

（4）Controller（注意要有@RequestController注解）


@RestController
@RequestMapping("/cms")
  @Autowired
  public CmsService cmsService;
  /**
   * 查询轮播图信息
   *
   * @return
   */
  @GetMapping("/queryCarouselList")
  public Object queryCarouselList(HttpServletResponse response, @RequestParam("page") Integer page, @RequestParam("size") Integer size){
    response.setHeader("Access-Control-Allow-Origin", "*");//解决跨域的问题
    List<Carousel> carouselList = cmsService.queryCarousel(page,size);
    if (carouselList == null){
      return RecycleResult.build(500,"轮播图为空");
    }
    //return RecycleResult.ok(carouselList);
    //return carouselList;
    Integer count = cmsService.countCarousel();
    return new LayuiReplay<Carousel>(0, "OK", count, carouselList);
  }

二、删除操作

1.前端


<script type="text/html" id="barDemo">
  <a class="layui-btn layui-btn-xs" lay-event="detail">查看</a>
  <!--<a class="layui-btn layui-btn-xs" lay-event="edit">编辑</a>-->
  <a class="layui-btn layui-btn-danger layui-btn-xs" lay-event="del">删除</a>
 </script>
                {
   fixed: 'right',
   width: '15%',
   align: 'center',
   title: '操作',
   toolbar: '#barDemo'
  }
   fixed: 'right',
   width: '15%',
   align: 'center',
   title: '操作',
   toolbar: '#barDemo'
  }
//监听工具条
 table.on('tool(content_lbt_filter)', function(obj) { //注：tool是工具条事件名，test是table原始容器的属性 lay-filter="对应的值"
  var data = obj.data //获得当前行数据
  ,
  layEvent = obj.event; //获得 lay-event 对应的值
  if(layEvent === 'detail') {
  layer.msg('查看操作');
  } else if(layEvent === 'del') {
  layer.confirm('真的删除行么', function(index) {
   //obj.del(); //删除对应行（tr）的DOM结构
   delCarouselById(data.id);
   layer.close(index);
   //向服务端发送删除指令
  });
  }
  /*else if(layEvent === 'edit'){
    layer.msg('编辑操作');
   }*/
 });
 //删除记录
 function delCarouselById(id) {
  $.get("http://localhost:9911/cms/delCarouselById?id=" + id,
  function(data, status) {
   layer.msg('删除成功');
  });
 }

2.后端（此处仅显示controller层和mapper）


 @GetMapping("/delCarouselById")
  public RecycleResult delCarouselById(HttpServletResponse response,@RequestParam("id") Integer id){
    response.setHeader("Access-Control-Allow-Origin", "*");
    cmsService.delCarouselById(id);
    return RecycleResult.ok();
  }
<delete id="delCarouselById">
    DELETE FROM carousel
    WHERE id = #{id}
  </delete>

补充LayuiReplay类（其中get、set方法省略）


public class LayuiReplay <T> {
  private int code;
  private String msg;
  private int count;
  private List<T> data;
  public LayuiReplay(int code, String msg, int count, List<T> data) {
    this.code = code;
    this.msg = msg;
    this.count = count;
    this.data = data;
  }
  public String toJson() {
    Gson gson = new Gson();
    String json = gson.toJson(this);
    return json;
  }
  public static <T> String toJson(int count, List<T> data) {
    LayuiReplay<T> replay = new LayuiReplay<>(ReplyCode.OK.getCode(), ReplyCode.OK.getMessage(), count, data);
    return replay.toJson();
  }
}

补充ReplyCode.java枚举类


public enum ReplyCode {
  NOT_LOGIN(-1,"您尚未登录或登录时间过长,请重新登录或刷新页面!"),
  OK(0, "OK"),
  WRONG_URL(400,"请求路径错误"),
  WRONG_ROLE(401, "身份错误"),
  REQUEST_FAILED(500, "请求失败，请重试"),
  NULL_ATTR(30,"属性不能为空"),
  ATTR_WRONG(31, "属性填写错误"),
  WRONG_LENGTH(32, "数据长度不符合要求"),
  WRONG_PATTERN(33, "数据格式错误"),
  VAILD_WRONG(100,"验证码错误"),
  CUSTOM(999, "")
  ;
  ReplyCode(int code, String message) {
    this.code = code;
    this.message = message;
  }
  private int code;
  private String message;
  public int getCode() {
    return code;
  }
  public ReplyCode setCode(int code) {
    this.code = code;
    return this;
  }
  public String getMessage() {
    return message;
  }
  public ReplyCode setMessage(String message) {
    this.message = message;
    return this;
  }
}