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: mysql
  supportMethodsArguments: 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)
    @Override
    public 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;
    }

---

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("[email protected]");
        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();
    }
}