1. //1. 导入pager-taglib.jar包；
2. //2.引入pager-taglib标签：<%@ taglib prefix="pg" uri="http://jsptags.com/tags/navigation /pager" %>
3. //3.建立PagerModel类：
4. public class PagerModel {
5. /**
6. * 总记录数
7. */
8. private int total;
9. /**
10. * 当前页结果集
11. */
12. private List datas;
13. public List getDatas() {
14. return datas;
15. }
16. public void setDatas(List datas) {
17. this.datas = datas;
18. }
19. public int getTotal() {
20. return total;
21. }
22. public void setTotal(int total) {
23. this.total = total;
24. }
25. }
26. //4.pager业务逻辑部分：
27. public class AbstractManager extends HibernateDaoSupport {
28. public PagerModel searchHql(String hql){
29. return searchHql(hql,null,SystemContext.getOffset(),SystemContext.getPageSize());
30. }
31. public PagerModel searchHql(String hql,Object datas){
32. return searchHql(hql,new Object[]{datas},SystemContext.getOffset(),SystemContext.getPageSize());
33. }
34. public PagerModel searchHql(String hql,Object[] datas){
35. return searchHql(hql,datas,SystemContext.getOffset(),SystemContext.getPageSize());
36. }
37. public PagerModel searchHql(String hql,int offset,int pageSize){
38. return searchHql(hql,null,offset,pageSize);
39. }
40. public PagerModel searchHql(String hql,Object datas,int offset,int pageSize){
41. return searchHql(hql,new Object[]{datas},offset,pageSize);
42. }
43. public PagerModel searchHql(String hql,Object[] datas,int offset,int pageSize){
44. String countHql = getQuery(hql);
45. Query query = getSession().createQuery(countHql);
46. if(datas !=null && datas.length > 0){
47. for(int i = 0 ; i<datas.length;i++)
48. query.setParameter(i, datas[i]);
49. }
50. int total = ((Long)query.uniqueResult()).intValue();
51. Query query1=getSession().createQuery(hql);
52. if(datas !=null && datas.length > 0){
53. for(int i = 0 ; i<datas.length;i++)
54. query1.setParameter(i, datas[i]);
55. }
56. List list =query1.setFirstResult(offset) .setMaxResults(pageSize).list();
57. PagerModel pm = new PagerModel();
58. pm.setDatas(list);
59. pm.setTotal(total);
60. return pm;
61. }
62. public String getQuery(String hql){
63. int index =hql.indexOf("from");
64. if(index != -1){
65. return "select count(*)"+hql.substring(index);
66. }
67. throw new SystemException("查询语句出错！");
68. }
69. }
70.
71. //5.定义offset、pagesize类：
72. public class SystemContext {
73. private static ThreadLocal offset = new ThreadLocal();
74. private static ThreadLocal pageSize = new ThreadLocal();
75. public static int getOffset(){
76. Integer os = (Integer)offset.get();
77. if(os == null){
78. return 0;
79. }
80. return os;
81. }
82. public static void setOffset(int offsetvalue){
83. offset.set(offsetvalue);
84. }
85. public static void removeOffset(){
86. offset.remove();
87. }
88. public static int getPageSize(){
89. Integer ps = (Integer)pageSize.get();
90. if(ps == null){
91. return Integer.MAX_VALUE;
92. }
93. return ps;
94. }
95. public static void setPageSize(int pageSizevalue){
96. pageSize.set(pageSizevalue);
97. }
98. public static void removePageSize(){
99. pageSize.remove();
100. }
101. }
102. //6.过滤器中初始化pagesize、offset：
103. public class PagerFilter implements Filter {
104. public void destroy() {
105. }
106. public void doFilter(ServletRequest request, ServletResponse response,
107. FilterChain chain) throws IOException, ServletException {
108. HttpServletRequest httpRequest =(HttpServletRequest)request;
109. SystemContext.setOffset(getOffset(httpRequest));
110. SystemContext.setPageSize(getPageSize(httpRequest));
111. try{
112. chain.doFilter(request, response);
113. }finally{
114. //清空ThreadLocal中的值
115. SystemContext.removeOffset();
116. SystemContext.removePageSize();
117. }
118. }
119. public void init(FilterConfig arg0) throws ServletException {
120. }
121. public int getOffset(HttpServletRequest request){
122. int offset = 0;
123. try {
124. offset = Integer.parseInt(request.getParameter("pager.offset"));
125. } catch (NumberFormatException ignore) {
126. }
127. return offset;
128. }
129. //设置每页显示多少条记录
130. public int getPageSize(HttpServletRequest request){
131. return 3;
132. }
133. }
134. //7.配置过滤器web.xml中：
135. <filter>
136. <filter-name>pager-taglib</filter-name>
137. <filter-class>com.oa.util.filter.PagerFilter</filter-class>
138. </filter>
139.
140. <filter-mapping>
141. <filter-name>pager-taglib</filter-name>
142. <url-pattern>/*</url-pattern>
143. </filter-mapping>
144. //8.显示效果：
145. <pg:pager url="org.do" items="${pm.total }" export="currentPageNumber=pageNumber">
146. <pg:param name="parentId"/>
147. <pg:first>
148. <a href="${pageUrl}" mce_href="${pageUrl}">首页</a>
149. </pg:first>
150. <pg:prev>
151. <a href="${pageUrl }" mce_href="${pageUrl }">前页</a>
152. </pg:prev>
153. <pg:pages>
154. <c:choose>
155. <c:when test="${currentPageNumber eq pageNumber }">
156. <font color="red">${pageNumber }</font>
157. </c:when>
158. <c:otherwise>
159. <a href="${pageUrl }" mce_href="${pageUrl }">${pageNumber }</a>
160. </c:otherwise>
161. </c:choose>
162. </pg:pages>
163. <pg:next>
164. <a href="${pageUrl }" mce_href="${pageUrl }">后页</a>
165. </pg:next>
166. <pg:last>
167. <a href="${pageUrl }" mce_href="${pageUrl }">尾页</a>
168. </pg:last>
169. </pg:pager>
