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27. SystemContext.removeOffset();
28. SystemContext.removePagesize();
29. }
30. return result;
31. }
32.
33. private int getOffset(HttpServletRequest request) {
34. int offset = 0;
35. try {
36. offset = Integer.parseInt(request.getParameter("pager.offset"));
37. } catch (Exception ignore) {
38. }
39. return offset;
40. }
41. private int getPagesize(HttpServletRequest httpRequest) {
42. // 首先判断request中是否有pagesize参数，如果有这个参数，证明客户端正在请求改变每页显示的行数
43. String psvalue = httpRequest.getParameter(PAGE_SIZE_NAME);
44. if (psvalue != null && !psvalue.trim().equals("")) {
45. Integer ps = 0;
46. try {
47. ps = Integer.parseInt(psvalue);
48. } catch (Exception e) {
49. }
50. if (ps != 0) {
51. httpRequest.getSession().setAttribute(PAGE_SIZE_NAME, ps);
52. }
53. }
54. // 判断当前session中是否有pagesize的值
55. Integer pagesize = (Integer) httpRequest.getSession().getAttribute(PAGE_SIZE_NAME);
56. if (pagesize == null) {
57. Integer pageSize= Integer.parseInt(ServletActionContext.getServletContext().getInitParameter("pageSize"));//这里没有用try拦截异常,以为在它的上层拦截了异常.此处进行了每页记录数可配置的扩展功能.
58. httpRequest.getSession().setAttribute(PAGE_SIZE_NAME, pageSize);
59. return pageSize;
60. }
61. return pagesize;
62. }
63. }
package com.ssh.utile;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;
public class PagerInterceptor extends MethodFilterInterceptor {
public static final String PAGE_SIZE_NAME = "ps";
@Override
protected String doIntercept(ActionInvocation invocation) throws Exception {
String result="";
try {
//在调用真正的方法之前在线程内设置pagesize和offset.
HttpServletRequest httpRequest = ServletActionContext.getRequest();
SystemContext.setOffset(getOffset(httpRequest));
SystemContext.setPagesize(getPagesize(httpRequest));
//调用真正的方法.
result=invocation.invoke();
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("分页时传入参数出错!");
}finally {
//不管是否调用真正的方法,都要移除线程内的ThreadLocal对象.
SystemContext.removeOffset();
SystemContext.removePagesize();
}
return result;
}
private int getOffset(HttpServletRequest request) {
int offset = 0;
try {
offset = Integer.parseInt(request.getParameter("pager.offset"));
} catch (Exception ignore) {
}
return offset;
}
private int getPagesize(HttpServletRequest httpRequest) {
// 首先判断request中是否有pagesize参数，如果有这个参数，证明客户端正在请求改变每页显示的行数
String psvalue = httpRequest.getParameter(PAGE_SIZE_NAME);
if (psvalue != null && !psvalue.trim().equals("")) {
Integer ps = 0;
try {
ps = Integer.parseInt(psvalue);
} catch (Exception e) {
}
if (ps != 0) {
httpRequest.getSession().setAttribute(PAGE_SIZE_NAME, ps);
}
}
// 判断当前session中是否有pagesize的值
Integer pagesize = (Integer) httpRequest.getSession().getAttribute(PAGE_SIZE_NAME);
if (pagesize == null) {
Integer pageSize= Integer.parseInt(ServletActionContext.getServletContext().getInitParameter("pageSize"));//这里没有用try拦截异常,以为在它的上层拦截了异常.此处进行了每页记录数可配置的扩展功能.
httpRequest.getSession().setAttribute(PAGE_SIZE_NAME, pageSize);
return pageSize;
}
return pagesize;
}
}
在Struts2的配置文件中配置如下:
[html] view plaincopyprint?
01. <interceptors>
02. <interceptor name="pager" class="com.ssh.utile.PagerInterceptor" />
03. <interceptor-stack name="myInterceptor">
04. <interceptor-ref name="pager">
05. <!--<param name="includeMethods">queryUser</param>-->
06. </interceptor-ref>
07. <interceptor-ref name="defaultStack"></interceptor-ref>
08. </interceptor-stack>
09.</interceptors>
<interceptors>
<interceptor name="pager" class="com.ssh.utile.PagerInterceptor" />
<interceptor-stack name="myInterceptor">
<interceptor-ref name="pager">
<!--<param name="includeMethods">queryUser</param>-->
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</interceptor-stack>
</interceptors>
[html] view plaincopyprint?
01. <action name="user" class="userAction" >
02. <result name="showQuery">/showQuery.jsp</result>
03. <result name="error">/error.jsp</result>
04. <result name="showUpdate">/update.jsp</result>
05. <result name="success">/pub_add_success.jsp</result>
06. <interceptor-ref name="myInterceptor"></interceptor-ref>
07.</action>
<action name="user" class="userAction" >
<result name="showQuery">/showQuery.jsp</result>
<result name="error">/error.jsp</result>
<result name="showUpdate">/update.jsp</result>
<result name="success">/pub_add_success.jsp</result>
<interceptor-ref name="myInterceptor"></interceptor-ref>
</action>
在web.xml中加入下面的配置:运动会加油稿
[html] view plaincopyprint?
01.<context-param>
02. <param-name>page_size</param-name>
03. <param-value>5</param-value>
04.</context-param>
<context-param>
<param-name>page_size</param-name>
<param-value>5</param-value>
</context-param>
再加一句,使用Spring的AOP编程也是完全可以实现的. 上一页 [1] [2]
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