javaweb实现分页_javaweb分页功能的代码

首先我们要清楚java分页的思路

第一我们要明白前端页面需要向java后台传递当前页码数以及每页显示多少条数据

第二java后台代码需要向前端页面传递每页显示的数据,以及总条数以及总页数

代码如下:

首先我们要创建一个分页类用来存储数据

public class PageObject implements Serializable {

private static final long serialVersionUID = 1L;

/** 当前页的页码值 */

private Integer pageCurrent = 1;

/** 页面大小 */

private Integer pageSize = 10;

/** 总行数(通过查询获得) */

private Integer rowCount = 0;

/** 总页数(通过计算获得) */

private Integer pageCount = 0;

/** 当前页记录 */

private List records;

public Integer getPageCurrent() {

return pageCurrent;

}

public void setPageCurrent(Integer pageCurrent) {

this.pageCurrent = pageCurrent;

}

public Integer getPageSize() {

return pageSize;

}

public void setPageSize(Integer pageSize) {

this.pageSize = pageSize;

}

public Integer getRowCount() {

return rowCount;

}

public void setRowCount(Integer rowCount) {

this.rowCount = rowCount;

}

public Integer getPageCount() {

pageCount = rowCount / pageSize;

if (rowCount % pageSize != 0) {

pageCount++;

}

return pageCount;

}

public void setPageCount(Integer pageCount) {

this.pageCount = pageCount;

}

public List getRecords() {

return records;

}

public void setRecords(List records) {

this.records = records;

}

@Override

public String toString() {

return “PageObject [pageCurrent=” + pageCurrent + “, pageSize=” + pageSize + “, rowCount=” + rowCount

+ “, pageCount=” + pageCount + “, records=” + records + “]”;

}

}

Controller层方法:

@RequestMapping(“/getLog”)

@ResponseBody

public PageObject getLog(@RequestBody Map param) throws ParseException {

System.out.println(“Map集合参数” + param);

String user = (String) param.get(“user”);

String date = (String) param.get(“date”);

Date parse=null;

if(date!=null) {

SimpleDateFormat dFormat = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);

parse= dFormat.parse(date); // Date date = (Date) param.get(“date”);

}

System.out.println(“解析后日期格式” + parse);

int pageCurrent = Integer.parseInt(“” + param.get(“pageCurrent”));

int pageSize = Integer.parseInt(“” + param.get(“pageSize”));

if (pageCurrent == 0) {

pageCurrent = 1;

}

if (pageSize == 0) {

pageSize = 10;

}

return logService.getLog(pageCurrent, pageSize, user, parse);

}

Service层代码:

@Autowired

SysLogDao logdao;

/***

* 根据日期或者用户查询

*/

@Override

public PageObject getLog( int pageCurrent, int pageSize,String user,Date date) {

PageObject pageObject = new PageObject();

// 设置当前页

pageObject.setPageCurrent(pageCurrent);

// 设置每页显示的条数

pageObject.setPageSize(pageSize);

// 设置总记录数

Map map=new HashMap();

map.put(“user”, user);

map.put(“date”, date);

int count = logdao.getLogCount(user,date);

System.out.println(“=============”);

System.out.println(“总条数”+count);

pageObject.setPageCount(count);

// 设置总页数

int page = count % pageSize == 0 ? count / pageSize : (count / pageSize) + 1;

pageObject.setRowCount(page);

// 设置每页显示数据集合

// 开始的记录数

int start = (pageCurrent – 1) * pageSize;

System.out.println(start+”-“+pageSize);

List byPage = logdao.getLog( start, pageSize,user,date);

pageObject.setRecords(byPage);

System.out.println(start+”-“+byPage);

return pageObject;

}

Mapper.xml代码如下:

select count(*) from sys_login_log

and login_user=#{user}

and log_date=#{date}

select * from sys_login_log

and login_user=#{user}

and log_date=#{date}

limit #{start},#{pageSize}