import java.io.Serializable;
import java.util.List;
/**
* 数据分页组件
*
* @author pengchengming
*/
public class Page implements Serializable {
private static final long serialVersionUID = -5764853545343945831L;
/**
* 默认每页记录数(20)
*/
public static final int DEFAULT_PAGE_SIZE = 20;
/**
* 最大每页记录数(1000)
*/
public static final int MAX_PAGE_SIZE = 1000;
/**
* 当前分页的数据集
*/
private List list;
/**
* 总记录数
*/
private int totalCount;
/**
* 总页数
*/
private int totalPage;
/**
* 当前页
*/
private int pageCurrent;
/**
* 每页记录数
*/
private int pageSize;
/**
* 排序字段
*/
private String orderField;
/**
* 排序方式：asc or desc
*/
private String orderDirection;
/**
* 默认构造函数
*/
public Page() {
}
/**
* 构造函数
*
* @param totalCount
* 总记录数
* @param totalPage
* 总页数
* @param pageCurrent
* @param pageSize
* @param list
*/
public Page(int totalCount, int totalPage, int pageCurrent, int pageSize, List list) {
this.totalCount = totalCount;
this.totalPage = totalPage;
this.pageCurrent = pageCurrent;
this.pageSize = pageSize;
this.list = list;
}
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public int getTotalPage() {
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public int getPageCurrent() {
return pageCurrent;
}
public void setPageCurrent(int pageCurrent) {
this.pageCurrent = pageCurrent;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public String getOrderField() {
return orderField;
}
public void setOrderField(String orderField) {
this.orderField = orderField;
}
public String getOrderDirection() {
return orderDirection;
}
public void setOrderDirection(String orderDirection) {
this.orderDirection = orderDirection;
}
}
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* sql工具类
*
* @author pengchengming
*/
public class Sql {
private Sql() {
}
/**
* 检测sql，防止sql注入
*
* @param sql
* sql
* @return 正常返回sql；异常返回""
*/
public static String checkSql(String sql) {
String inj_str = "'|and|exec|insert|select|delete|update|count|*|%|chr|mid|master|truncate|char|declare|;|or|-|+|,";
String inj_stra[] = inj_str.split("\\|");
for (int i = 0; i < inj_stra.length; i++) {
if (sql.indexOf(inj_stra[i]) >= 0) {
return "";
}
}
return sql;
}
/**
* 计算总页数
*
* @param totalCount
* 总记录数.
* @param pageSize
* 每页记录数.
* @return totalPage 总页数.
*/
public static int countTotalPage(final int totalCount, final int pageSize) {
if (totalCount % pageSize == 0) {
return totalCount / pageSize; // 刚好整除
} else {
return totalCount / pageSize + 1; // 不能整除则总页数为：商 + 1
}
}
/**
* 校验当前页数pageCurrent
* 1、先根据总记录数totalCount和每页记录数pageSize，计算出总页数totalPage
* 2、判断页面提交过来的当前页数pageCurrent是否大于总页数totalPage，大于则返回totalPage
* 3、判断pageCurrent是否小于1，小于则返回1
* 4、其它则直接返回pageCurrent
*
* @param totalCount
* 要分页的总记录数
* @param pageSize
* 每页记录数大小
* @param pageCurrent
* 输入的当前页数
* @return pageCurrent
*/
public static int checkPageCurrent(int totalCount, int pageSize, int pageCurrent) {
int totalPage = countTotalPage(totalCount, pageSize); // 最大页数
if (pageCurrent > totalPage) {
// 如果页面提交过来的页数大于总页数，则将当前页设为总页数
// 此时要求totalPage要大于获等于1
if (totalPage < 1) {
return 1;
}
return totalPage;
} else if (pageCurrent < 1) {
return 1; // 当前页不能小于1（避免页面输入不正确值）
} else {
return pageCurrent;
}
}
/**
* 校验页面输入的每页记录数pageSize是否合法
* 1、当页面输入的每页记录数pageSize大于允许的最大每页记录数MAX_PAGE_SIZE时，返回MAX_PAGE_SIZE
* 2、如果pageSize小于1，则返回默认的每页记录数DEFAULT_PAGE_SIZE
*
* @param pageSize
* 页面输入的每页记录数
* @return checkPageSize
*/
public static int checkPageSize(int pageSize) {
if (pageSize > Page.MAX_PAGE_SIZE) {
return Page.MAX_PAGE_SIZE;
} else if (pageSize < 1) {
return Page.DEFAULT_PAGE_SIZE;
} else {
return pageSize;
}
}
/**
* 计算当前分页的开始记录的索引
*
* @param pageCurrent
* 当前第几页
* @param pageSize
* 每页记录数
* @return 当前页开始记录号
*/
public static int countOffset(final int pageCurrent, final int pageSize) {
return (pageCurrent - 1) * pageSize;
}
/**
* 根据总记录数，对页面传来的分页参数进行校验，并返分页的SQL语句
*
* @param pageCurrent
* 当前页
* @param pageSize
* 每页记录数
* @param pageBean
* DWZ分页查询参数
* @return limitSql
*/
public static String limitSql(int totalCount, int pageCurrent, int pageSize) {
// 校验当前页数
pageCurrent = checkPageCurrent(totalCount, pageSize, pageCurrent);
pageSize = checkPageSize(pageSize); // 校验每页记录数
return " limit " + countOffset(pageCurrent, pageSize) + "," + pageSize;
}
/**
* 根据分页查询的SQL语句，获取统计总记录数的语句
*
* @param sql
* 分页查询的SQL
* @return countSql
*/
public static String countSql(String sql) {
String countSql = sql.substring(sql.toLowerCase().indexOf("from")); // 去除第一个from前的内容
return "select count(*) " + removeOrderBy(countSql);
}
/**
* 移除SQL语句中的的order by子句（用于分页前获取总记录数，不需要排序）
*
* @param sql
* 原始SQL
* @return 去除order by子句后的内容
*/
private static String removeOrderBy(String sql) {
Pattern pat = Pattern.compile("order\\s*by[\\w|\\W|\\s|\\S]*", Pattern.CASE_INSENSITIVE);
Matcher mc = pat.matcher(sql);
StringBuffer strBuf = new StringBuffer();
while (mc.find()) {
mc.appendReplacement(strBuf, "");
}
mc.appendTail(strBuf);
return strBuf.toString();
}
}
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.util.Assert;
/**
* spirng jdbc 基本支撑类
*
* @author pengchengming
*/
public abstract class JdbcDaoImpl {
@Autowired
protected JdbcTemplate jdbcTemplate;
/**
* 获取当前事务最后一次更新的主键值
*/
public Long getLastId() {
return jdbcTemplate.queryForObject("select last_insert_id() as id", Long.class);
}
/**
* 获取对象信息
*/
public T queryForObject(String sql, Class clazz, Object... args) {
Assert.hasText(sql, "sql 语句不能为空");
return jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper(clazz), args);
}
/**
* 获取对象集合信息
*/
public List queryForObjectList(String sql, Class clazz, Object... args) {
Assert.hasText(sql, "sql 语句不能为空");
return jdbcTemplate.query(sql, args, new BeanPropertyRowMapper(clazz));
}
/**
* 分页，jdbcTemplate 不支持like
*/
public Page> queryForPage(String sql, int pageCurrent, int pageSize, Object... args) {
Assert.hasText(sql, "sql 语句不能为空");
Assert.isTrue(pageCurrent >= 1, "pageNo 必须大于等于1");
String sqlCount = Sql.countSql(sql);
int count = jdbcTemplate.queryForObject(sqlCount, Integer.class, args);
pageCurrent = Sql.checkPageCurrent(count, pageSize, pageCurrent);
pageSize = Sql.checkPageSize(pageSize);
int totalPage = Sql.countTotalPage(count, pageSize);
String sqlList = sql + Sql.limitSql(count, pageCurrent, pageSize);
List> list = jdbcTemplate.queryForList(sqlList, args);
return new Page>(count, totalPage, pageCurrent, pageSize, list);
}
/**
* 分页，jdbcTemplate 不支持like
*/
public Page queryForPage(String sql, int pageCurrent, int pageSize, Class clazz, Object... args) {
Assert.hasText(sql, "sql 语句不能为空");
Assert.isTrue(pageCurrent >= 1, "pageNo 必须大于等于1");
Assert.isTrue(clazz != null, "clazz 不能为空");
String sqlCount = Sql.countSql(sql);
int count = jdbcTemplate.queryForObject(sqlCount, Integer.class, args);
pageCurrent = Sql.checkPageCurrent(count, pageSize, pageCurrent);
pageSize = Sql.checkPageSize(pageSize);
int totalPage = Sql.countTotalPage(count, pageSize);
String sqlList = sql + Sql.limitSql(count, pageCurrent, pageSize);
List list = jdbcTemplate.query(sqlList, new BeanPropertyRowMapper(clazz), args);
return new Page(count, totalPage, pageCurrent, pageSize, list);
}
}
