从redis中取值然后通过list进行分页查询

1.首先是往redis中存入数据：

totalCost = yarnCost + hbaseCost + hdfsCost;
                                   map.put("busiName", busiList.get(q).getAppname());
                                   map.put("projectName", projectList.get(w).getGroupname());
                                   map.put("userList", list1);
                                   map.put("allCost", totalCost);
                                   map.put("storageCost", hbaseCost + hdfsCost);
                                   map.put("calculationCost", yarnCost);

                                   // 流成本
                                   map.put("liuCost", "0");

然后将map存入到list中：

list.add(map);

接下来是往redis中存入数据：

String redisid = redis_ip;
                               String redisport = redis_port;
                               Jedis jedis = new Jedis(redisid, Integer.valueOf(redisport));
                               String json = JSONObject.toJSONString(list);
                               jedis.set(tenantList.get(c).getTenantname(), json);
                               jedis.close();

存入redis库中的数据格式是：

是个String类型的JSON串（目前我是这么认为，因为对类型之间并不是很熟悉，尴尬！！！）

2.现在是从redis中取值，转成list集合，然后做分页查询：

public JsonResult getResourceCostCopy(@RequestParam(value="groupName")String groupName,@RequestParam(value="pageSize")Integer pageSize,@RequestParam(value="pageIndex")Integer pageIndex){
   List<Object> list = new ArrayList<Object>();
   String result = "";
   Object object = "";
   int fromIndex =0 ;
   int toIndex = 0 ;
       try {
           String redisid = redis_ip;
           String redisport = redis_port;
           Jedis jedis = new Jedis(redisid, Integer.valueOf(redisport));
           result = jedis.get(groupName);
           System.out.println(pageSize);
           System.out.println(pageIndex);
           JSONArray jsonArray = JSONArray.parseArray(result);
               Iterator<Object> iterator = jsonArray.iterator();
               while(iterator.hasNext()){
                   object= iterator.next();
                   list.add(object);
               }
               System.out.println(list);
               Paging paging = Paging.pagination(list.size(),pageSize,pageIndex);
               fromIndex = paging.getQueryIndex();
               toIndex = 0;
               if (fromIndex + paging.getPageSize() >= list.size()){
               toIndex = list.size();
               }else {
               toIndex = fromIndex + paging.getPageSize();
               }
               if (fromIndex > toIndex){
               return (JsonResult) Collections.EMPTY_LIST;
               }
               System.out.println(list.subList(fromIndex,toIndex));
           jedis.close();
       } catch (Exception e) {
           return new JsonResult(Constants.RESULTCODE_EXCEPTION, e.getMessage(), null);
       }
       return new JsonResult(Constants.RESULTCODE_SUCCESS, "获取联动表信息成功", list.subList(fromIndex,toIndex));
   }

3.当然，这里避免不了需要自己写个工具类：

public class Paging {
private Integer totalNum;//总条数
private Integer totalPage;//总页数
private Integer pageSize;//每页条数
private Integer pageIndex;//当前页码
private Integer queryIndex;//当前页从第几条开始查

public static Paging pagination(Integer totalNum,Integer pageSize,Integer pageIndex){
Paging page = new Paging();
page.setTotalNum(totalNum);
Integer totalPage = totalNum % pageSize == 0 ? totalNum / pageSize : totalNum / pageSize + 1;
page.setTotalPage(totalPage);
page.setPageIndex(pageIndex);
page.setPageSize(pageSize);
page.setQueryIndex(pageSize * (pageIndex-1));
return page;
}

public Integer getTotalNum() {
return totalNum;
}

public void setTotalNum(Integer totalNum) {
this.totalNum = totalNum;
}

public Integer getTotalPage() {
return totalPage;
}

public void setTotalPage(Integer totalPage) {
this.totalPage = totalPage;
}

public Integer getPageSize() {
return pageSize;
}

public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
}

public Integer getPageIndex() {
return pageIndex;
}

public void setPageIndex(Integer pageIndex) {
this.pageIndex = pageIndex;
}

public Integer getQueryIndex() {
return queryIndex;
}

public void setQueryIndex(Integer queryIndex) {
this.queryIndex = queryIndex;
}
}

4.最后，前台使用get请求方式访问，传入groupName和每页展示的的条数以及当前页数，就能展现成果了。

哈哈大功告成！！！！！

从redis中取值 然后通过list进行分页查询

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从redis中取值然后通过list进行分页查询