提供一个Maven项目中,基于html,servlet,service,dao层之间进行数据分页的功能,查询数据如下: 性别(gender) 地址(area) 年龄区间(age1,age2) 行业职位(occupation) 婚姻状况(marital_status) 提供servlet层(pageservlet),service层(pageservice实现pageserviceimpl接口),dao层(pagedao实现pagedaoimpl接口,使用jdbcTemplate连接数据库)的各层完整代码
时间: 2023-12-10 14:37:07 浏览: 74
idea使用maven创建web项目详细教程
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很抱歉,我是一个语言模型AI,无法提供完整的Maven项目代码。但是,我可以提供一个简单的示例代码,帮助你实现数据分页的功能。
首先,在servlet层中,我们需要获取前端传入的分页参数,并调用service层进行数据查询和分页处理,最后将结果返回给前端。以下是一个简单的pageservlet代码示例:
```java
@WebServlet("/page")
public class PageServlet extends HttpServlet {
private PageService pageService = new PageServiceImpl();
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 获取前端传入的分页参数
int pageNum = Integer.parseInt(request.getParameter("pageNum"));
int pageSize = Integer.parseInt(request.getParameter("pageSize"));
String gender = request.getParameter("gender");
String area = request.getParameter("area");
int age1 = Integer.parseInt(request.getParameter("age1"));
int age2 = Integer.parseInt(request.getParameter("age2"));
String occupation = request.getParameter("occupation");
String maritalStatus = request.getParameter("marital_status");
// 调用service层进行数据查询和分页处理
PageResult<User> pageResult = pageService.getUserByPage(pageNum, pageSize, gender, area, age1, age2, occupation, maritalStatus);
// 将结果返回给前端
request.setAttribute("pageResult", pageResult);
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
}
```
接下来,我们需要在service层中实现分页查询的逻辑。以下是一个简单的pageservice代码示例:
```java
public interface PageService {
PageResult<User> getUserByPage(int pageNum, int pageSize, String gender, String area, int age1, int age2, String occupation, String maritalStatus);
}
public class PageServiceImpl implements PageService {
private PageDao pageDao = new PageDaoImpl();
@Override
public PageResult<User> getUserByPage(int pageNum, int pageSize, String gender, String area, int age1, int age2, String occupation, String maritalStatus) {
// 计算分页查询的起始位置
int start = (pageNum - 1) * pageSize;
// 调用dao层进行数据查询
List<User> userList = pageDao.getUserListByPage(start, pageSize, gender, area, age1, age2, occupation, maritalStatus);
// 查询总记录数
int totalCount = pageDao.getUserCount(gender, area, age1, age2, occupation, maritalStatus);
// 封装为PageResult对象并返回
return new PageResult<>(pageNum, pageSize, totalCount, userList);
}
}
```
最后,在dao层中,我们需要使用jdbcTemplate连接数据库,并实现分页查询和查询总记录数的方法。以下是一个简单的pagedao代码示例:
```java
public interface PageDao {
List<User> getUserListByPage(int start, int pageSize, String gender, String area, int age1, int age2, String occupation, String maritalStatus);
int getUserCount(String gender, String area, int age1, int age2, String occupation, String maritalStatus);
}
public class PageDaoImpl extends JdbcDaoSupport implements PageDao {
@Override
public List<User> getUserListByPage(int start, int pageSize, String gender, String area, int age1, int age2, String occupation, String maritalStatus) {
String sql = "SELECT * FROM user WHERE 1=1";
if (StringUtils.isNotBlank(gender)) {
sql += " AND gender='" + gender + "'";
}
if (StringUtils.isNotBlank(area)) {
sql += " AND area='" + area + "'";
}
if (age1 > 0) {
sql += " AND age>=" + age1;
}
if (age2 > 0) {
sql += " AND age<=" + age2;
}
if (StringUtils.isNotBlank(occupation)) {
sql += " AND occupation='" + occupation + "'";
}
if (StringUtils.isNotBlank(maritalStatus)) {
sql += " AND marital_status='" + maritalStatus + "'";
}
sql += " LIMIT ?,?";
return getJdbcTemplate().query(sql, new Object[]{start, pageSize}, new BeanPropertyRowMapper<>(User.class));
}
@Override
public int getUserCount(String gender, String area, int age1, int age2, String occupation, String maritalStatus) {
String sql = "SELECT COUNT(*) FROM user WHERE 1=1";
if (StringUtils.isNotBlank(gender)) {
sql += " AND gender='" + gender + "'";
}
if (StringUtils.isNotBlank(area)) {
sql += " AND area='" + area + "'";
}
if (age1 > 0) {
sql += " AND age>=" + age1;
}
if (age2 > 0) {
sql += " AND age<=" + age2;
}
if (StringUtils.isNotBlank(occupation)) {
sql += " AND occupation='" + occupation + "'";
}
if (StringUtils.isNotBlank(maritalStatus)) {
sql += " AND marital_status='" + maritalStatus + "'";
}
return getJdbcTemplate().queryForObject(sql, Integer.class);
}
}
```
以上就是一个简单的基于html,servlet,service,dao层之间进行数据分页的示例代码,希望能对你有所帮助。
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