2.03 PageHelper分页工具

步骤1：在application.yml中添加分页配置

# 分页插件配置
pagehelper:helperDialect: mysqlsupportMethodsArguments: true

步骤2：在顶级工程pom文件下引入分页插件依赖

<!--5.PageHelper -->
<dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.2.12</version>
</dependency>

步骤3：创建用来返回分页Grid的数据格式

/*** @Description: 用来返回分页Grid的数据格式*/
public class PagedGridResult {private int page;			// 当前页数private int total;			// 总页数private long records;		// 总记录数private List<?> rows;		// 每行显示的内容public int getPage() {return page;}public void setPage(int page) {this.page = page;}public int getTotal() {return total;}public void setTotal(int total) {this.total = total;}public long getRecords() {return records;}public void setRecords(long records) {this.records = records;}public List<?> getRows() {return rows;}public void setRows(List<?> rows) {this.rows = rows;}
}

步骤4：service接口中使用mybatis-pagehelper

@Transactional(propagation = Propagation.SUPPORTS)@Overridepublic PagedGridResult queryPagedComments(String itemId, Integer level,Integer page, Integer pageSize) {Map<String, Object> map = new HashMap<>();map.put("itemId", itemId);map.put("level", level);/** page: 第几页 pageSize: 每页显示条数 */PageHelper.startPage(page, pageSize);List<ItemCommentVO> list = itemsMapperCustom.queryItemComments(map);return setterPagedGrid(list, page);}private PagedGridResult setterPagedGrid(List<?> list, Integer page) {PageInfo<?> pageList = new PageInfo<>(list);PagedGridResult grid = new PagedGridResult();grid.setPage(page);grid.setRows(list);grid.setTotal(pageList.getPages());grid.setRecords(pageList.getTotal());return grid;}

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通用脱敏工具类:

/*** 通用脱敏工具类* 可用于： 用户名 手机号 邮箱 地址等*/
public class DesensitizationUtil {private static final int SIZE = 6;private static final String SYMBOL = "*";public static void main(String[] args) {String name = commonDisplay("name djh");String mobile = commonDisplay("13900000000");String mail = commonDisplay("[e-mail]");String address = commonDisplay("address 888 num");System.out.println(name);System.out.println(mobile);System.out.println(mail);System.out.println(address);}/*** 通用脱敏方法* @param value* @return*/public static String commonDisplay(String value) {if (null == value || "".equals(value)) {   return value;  }int len = value.length();int pamaone = len / 2;int pamatwo = pamaone - 1;int pamathree = len % 2;StringBuilder stringBuilder = new StringBuilder();if (len <= 2) {if (pamathree == 1) {return SYMBOL;}stringBuilder.append(SYMBOL);stringBuilder.append(value.charAt(len - 1));} else {if (pamatwo <= 0) {stringBuilder.append(value.substring(0, 1));stringBuilder.append(SYMBOL);stringBuilder.append(value.substring(len - 1, len));} else if (pamatwo >= SIZE / 2 && SIZE + 1 != len) {int pamafive = (len - SIZE) / 2;stringBuilder.append(value.substring(0, pamafive));for (int i = 0; i < SIZE; i++) {stringBuilder.append(SYMBOL);}if ((pamathree == 0 && SIZE / 2 == 0) || (pamathree != 0 && SIZE % 2 != 0)) {stringBuilder.append(value.substring(len - pamafive, len));} else {stringBuilder.append(value.substring(len - (pamafive + 1), len));}} else {int pamafour = len - 2;stringBuilder.append(value.substring(0, 1));for (int i = 0; i < pamafour; i++) {stringBuilder.append(SYMBOL);}stringBuilder.append(value.substring(len - 1, len));}}return stringBuilder.toString();}
}