[原创]使用struts中的标记

使用struts中的<logic:iterate>标记,可以完成一些复杂的循环。
下面用了一个小例子说明这一点：

 

IterateBean.java:

package beantest;

import org.apache.struts.action.ActionForm;

public class IterateBean extends ActionForm {
 private String[] name_coll = null;
 public void setName_coll(String[] name_coll) {
  this.name_coll = name_coll;
 }
 public String[] getName_coll() {
  return this.name_coll;
 }
 
 private String[] name_new = null;
 public void setName_new(String[] name_new) {
  System.out.println("IterateBean:setName_new(String[])");
  this.name_new = name_new;
 }
 public String[] getName_new() {
  return this.name_new;
 }
}

IterateAction.java

package beantest;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class IterateAction extends Action {
 public ActionForward execute(
   ActionMapping mapping,
   ActionForm form,
   HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  IterateBean ibean = (IterateBean) form;
  String[] temp = {"bitan", "helen"};
  ibean.setName_coll(temp);
  temp = new String[] {"aaaaa", "bbbbb"};
  ibean.setName_new(temp);
  return mapping.findForward("iterate-view");
 }
}

iterate-view.jsp:

<%@ page contentType="text/html;charset=gb2312" %>

<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<logic:iterate id="iterate" name="ibean" property="name_coll" scope="request" offset="0" >

 <logic:iterate id="iterate_new" name="ibean" property="name_new" scope="request" offset="0" >
  name: <font color=red><%=iterate%></font> ; code: <font color=red><%=iterate_new%></font><br>
 </logic:iterate>

 ★〓〓〓〓〓〓〓〓★<br>
 <bean:include id="lower" page="/test/lower.jsp" />
 <bean:write name="lower" filter="false"/><br>
</logic:iterate>

lower.jsp:

<font color=blue>hello, iterate!</font>

struts-config.xml:

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
    <form-beans>
       <form-bean type="beantest.IterateBean" name="ibean" />
    </form-beans>
    <action-mappings>
       <action path="/iterate-test" type="beantest.IterateAction" name="ibean" scope="request" >
           <forward path="/test/iterate-view.jsp" name="iterate-view" />
       </action>
   </action-mappings>
</struts-config>

web.xml:

<?xml version="1.0" ?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>

 <servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>/WEB-INF/struts-config.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>/eye/*</url-pattern>
 </servlet-mapping>

</web-app>

输出效果：

name: bitan ; code: aaaaa
name: bitan ; code: bbbbb
★〓〓〓〓〓〓〓〓★
hello, iterate!
name: helen ; code: aaaaa
name: helen ; code: bbbbb
★〓〓〓〓〓〓〓〓★
hello, iterate!

如上所示，一个循环中不能直接将多个变量同时输出；但在循环中嵌套循环可以实现一种复杂效果。

要实现在一个循环中将多个变量同时输出，可以引用<bean:include>、<bean:write>标记。

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