先给你们展现下分页效果,若是亲们还很满意请参考如下代码。java
在超连接中要保留参数web
当使用多条件查询后,而后在点击第2 页时,这个第2页超连接没有条件了,因此会丢失条件,因此咱们须要在页面上的全部连接都要保留条件!dom
咱们要把条件以一个字符串的形式保存到PageBean的url中!这个任务交给Servlet!jsp
pagebeanthis
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
package
cn.itcast.cstm.domain;
import
java.util.List;
public
class
PageBean<T> {
private
int
pc;
// 当前页码page code
//private int tp;// 总页数total page
private
int
tr;
// 总记录数total record
private
int
ps;
// 每页记录数page size
private
List<T> beanList;
// 当前页的记录
private
String url;
//它就是url后的条件!
public
String getUrl() {
return
url;
}
public
void
setUrl(String url) {
this
.url = url;
}
public
int
getPc() {
return
pc;
}
public
void
setPc(
int
pc) {
this
.pc = pc;
}
/**
* 计算总页数
* @return
*/
public
int
getTp() {
// 经过总记录数和每页记录数来计算总页数
int
tp = tr / ps;
return
tr%ps==
0
? tp : tp+
1
;
}
// public void setTp(int tp) {
// this.tp = tp;
// }
public
int
getTr() {
return
tr;
}
public
void
setTr(
int
tr) {
this
.tr = tr;
}
public
int
getPs() {
return
ps;
}
public
void
setPs(
int
ps) {
this
.ps = ps;
}
public
List<T> getBeanList() {
return
beanList;
}
public
void
setBeanList(List<T> beanList) {
this
.beanList = beanList;
}
}
|
jsp页面编码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
第${pb.pc }页/共${pb.tp }页
<a href=
"${pb.url }&pc=1"
>首页</a>
<c:
if
test=
"${pb.pc > 1 }"
>
<a href=
"${pb.url }&pc=${pb.pc-1}"
>上一页</a>
</c:
if
>
<%-- 计算begin、end --%>
<c:choose>
<%-- 若是总页数不足
10
页,那么把全部的页数都显示出来! --%>
<c:when test=
"${pb.tp <= 10 }"
>
<c:set var=
"begin"
value=
"1"
/>
<c:set var=
"end"
value=
"${pb.tp }"
/>
</c:when>
<c:otherwise>
<%-- 当总页数>
10
时,经过公式计算出begin和end --%>
<c:set var=
"begin"
value=
"${pb.pc-5 }"
/>
<c:set var=
"end"
value=
"${pb.pc+4 }"
/>
<%-- 头溢出 --%>
<c:
if
test=
"${begin < 1 }"
>
<c:set var=
"begin"
value=
"1"
/>
<c:set var=
"end"
value=
"10"
/>
</c:
if
>
<%-- 尾溢出 --%>
<c:
if
test=
"${end > pb.tp }"
>
<c:set var=
"begin"
value=
"${pb.tp - 9 }"
/>
<c:set var=
"end"
value=
"${pb.tp }"
/>
</c:
if
>
</c:otherwise>
</c:choose>
<%-- 循环遍历页码列表 --%>
<c:forEach var=
"i"
begin=
"${begin }"
end=
"${end }"
>
<c:choose>
<c:when test=
"${i eq pb.pc }"
>
[${i }]
</c:when>
<c:otherwise>
<a href=
"${pb.url }&pc=${i}"
>[${i }]</a>
</c:otherwise>
</c:choose>
</c:forEach>
<c:
if
test=
"${pb.pc < pb.tp }"
>
<a href=
"${pb.url }&pc=${pb.pc+1}"
>下一页</a>
</c:
if
>
<a href=
"${pb.url }&pc=${pb.tp}"
>尾页</a>
|
servleturl
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
package
cn.itcast.cstm.web.servlet;
import
java.io.IOException;
import
java.io.UnsupportedEncodingException;
import
java.util.List;
import
javax.servlet.ServletException;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
import
cn.itcast.commons.CommonUtils;
import
cn.itcast.cstm.domain.Customer;
import
cn.itcast.cstm.domain.PageBean;
import
cn.itcast.cstm.service.CustomerService;
import
cn.itcast.servlet.BaseServlet;
public
class
CustomerServlet
extends
BaseServlet {
private
CustomerService customerService =
new
CustomerService();
/**
* 获取pc
*
* @param request
* @return
*/
private
int
getPc(HttpServletRequest request) {
/*
* 1. 获得pc 若是pc参数不存在,说明pc=1 若是pc参数存在,须要转换成int类型便可
*/
String value = request.getParameter("pc");
if (value == null || value.trim().isEmpty()) {
return 1;
}
return Integer.parseInt(value);
}
//分页servlet
public String query(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// System.out.println(getUrl(request));
/*
* 0. 把条件封装到Customer对象中 1. 获得pc 2. 给定ps 3.
* 使用pc和ps,以及条件对象,调用service方法获得PageBean 4. 把PageBean保存到request域中 5.
* 转发到list.jsp
*/
// 获取查询条件
Customer criteria = CommonUtils.toBean(request.getParameterMap(), Customer.class);
/*
* 处理GET请求方式编码问题!
*/
criteria = encoding(criteria);
int pc = getPc(request);// 获得pc
int ps = 10;// 给定ps的值,第页10行记录
PageBean<Customer> pb = customerService.query(criteria, pc, ps);
// 获得url,保存到pb中
pb.setUrl(getUrl(request));
request.setAttribute("pb", pb);
return "f:/list.jsp";
}
/**
* 处理四样
*
* @param criteria
* @return
* @throws UnsupportedEncodingException
*/
private Customer encoding(Customer criteria) throws UnsupportedEncodingException {
String cname = criteria.getCname();
String gender = criteria.getGender();
String cellphone = criteria.getCellphone();
String email = criteria.getEmail();
if (cname != null && !cname.trim().isEmpty()) {
cname = new String(cname.getBytes("ISO-8859-1"), "utf-8");
criteria.setCname(cname);
}
if (gender != null && !gender.trim().isEmpty()) {
gender = new String(gender.getBytes("ISO-8859-1"), "utf-8");
criteria.setGender(gender);
}
if (cellphone != null && !cellphone.trim().isEmpty()) {
cellphone = new String(cellphone.getBytes("ISO-8859-1"), "utf-8");
criteria.setCellphone(cellphone);
}
if (email != null && !email.trim().isEmpty()) {
email = new String(email.getBytes("ISO-8859-1"), "utf-8");
criteria.setEmail(email);
}
return criteria;
}
/**
* 截取url /项目名/Servlet路径?参数字符串
*
* @param request
* @return
*/
private
String getUrl(HttpServletRequest request) {
String contextPath = request.getContextPath();
// 获取项目名
String servletPath = request.getServletPath();
// 获取servletPath,即/CustomerServlet
String queryString = request.getQueryString();
// 获取问号以后的参数部份
// 判断参数部份中是否包含pc这个参数,若是包含,须要截取下去,不要这一部份。
if
(queryString.contains(
"&pc="
)) {
int
index = queryString.lastIndexOf(
"&pc="
);
queryString = queryString.substring(
0
, index);
}
return
contextPath + servletPath +
"?"
+ queryString;
}
}
|
以上内容是是小编给你们分享的JSP通用高大上分页代码(超管用),但愿对你们有所帮助。spa