java中结合struts2自定义标签的使用
一、建立一个继承于SimpleTagSupport类实现它的doTag方法
1 package com.xiangshang.tag;
2
3 import java.io.IOException;
4 import java.util.List;
5
6 import javax.servlet.jsp.JspException;
7 import javax.servlet.jsp.PageContext;
8 import javax.servlet.jsp.tagext.SimpleTagSupport;
9
10 import com.opensymphony.xwork2.ActionContext;
11 import com.opensymphony.xwork2.util.ValueStack;
12
13 public class FunctionTag extends SimpleTagSupport {
14
15 private String value;
16
17 private String name;
18
19 public String getName() {
20 return name;
21 }
22
23 public void setName(String name) {
24 this.name = name;
25 }
26
27 public String getValue() {
28 return value;
29 }
30
31 public void setValue(String value) {
32 this.value = value;
33 }
34
35 @SuppressWarnings("unchecked")
36 @Override
37 public void doTag() throws JspException, IOException {
38 StringBuilder sb = new StringBuilder();
39 PageContext pageContext = (PageContext) this.getJspContext();
40 List<String> functions = (List<String>) pageContext.getSession()
41 .getAttribute("functions");
42 ValueStack vs = ActionContext.getContext().getValueStack();
43 String str = (String) vs.findValue(name);
44 for (String s : functions) {
45 if (s.equals(str)) {
46 sb.append("<a href=\"javascript:alert(‘有权限‘)\">")
47 .append(value).append("</a>");
48 break;
49 }
50 }
51 if (sb.length()==0) {
52 sb.append("<a href=\"javascript:alert(‘没权限！！‘)\">")
53 .append(value).append("</a>");
54 }
55 pageContext.getOut().print(sb);
56 }
57 }
为了测试方便本人在建立了session监听器来存储function：
1 package com.xiangshang.listener;
2
3 import java.util.ArrayList;
4 import java.util.List;
5
6 import javax.servlet.ServletContext;
7 import javax.servlet.ServletContextEvent;
8 import javax.servlet.ServletContextListener;
9 import javax.servlet.http.HttpSessionEvent;
10 import javax.servlet.http.HttpSessionListener;
11
12 import org.springframework.web.context.WebApplicationContext;
13 import org.springframework.web.context.support.WebApplicationContextUtils;
14
15 import com.xiangshang.service.UserService;
16
17 public class MySessionListener implements HttpSessionListener{
18 @Override
19 public void sessionCreated(HttpSessionEvent hse) {
20 System.out.println("Zhangqy Session Created");
21 List<String> functions= new ArrayList<String>();
22 functions.add("添加人信息");
23 functions.add("删除人信息");
24 functions.add("查看人信息");
25 functions.add("修改人信息");
26 hse.getSession().setAttribute("functions",functions);
27 }
28
29 @Override
30 public void sessionDestroyed(HttpSessionEvent hse) {
31 }
32
33
34 }
二、在WEB-INF下创建tld 文件：xiangshang.tld
1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd" >
3 <taglib>
4 <tlib-version>1.0</tlib-version>
5 <jsp-version>2.0</jsp-version>
6 <short-name>x</short-name>
7 <uri>/xiangshang-tags</uri>
8 <display-name>xiangshang tags</display-name>
9 <tag>
10 <name>a</name>
11 <tag-class>com.xiangshang.tag.FunctionTag</tag-class>
12 <body-content>empty</body-content>
13 <attribute>
14 <name>name</name>
15 <required>true</required>
16 <rtexprvalue>true</rtexprvalue>
17 <type>java.lang.String</type>
18 </attribute>
19 <attribute>
20 <name>value</name>
21 <required>true</required>
22 <rtexprvalue>true</rtexprvalue>
23 <type>java.lang.String</type>
24 </attribute>
25 </tag>
26 </taglib>
三、在jsp界面中首先倒入自定义的标签库 ：
<%@ taglib uri="/xiangshang-tags" prefix="x" %>
四、接下来就是开始使用自定义标签了：
<x:a name="添加人信息" value="添加人信息"/>
java中结合struts2自定义标签的使用,布布扣,bubuko.com
时间： 2024-10-25 20:55:58