[摘要]appName.length() < 1) errors.add("application name", new ActionError("error.appna... appName.length() < 1) {
errors.add("application name", new ActionError("error.appname.required"));
}
return errors;
}
}
-----------------------------------------------
这里是ActionServlet代码，继承Action：
-----------------------------------------------
package com.egi.core.ioblock.action;
import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
import com.egi.core.ioblock.form.LoginForm;
import com.mainet.core.sdivadsheet.db.MenusTreeTable;
import com.mainet.core.sdivadsheet.ProjectFactory;
/**
*Copyright: Copyright (c) 2002</p> <p>
*@author sjoy
*@created2003年6月4日
*@version1.0
*/
public class LoginAction extends Action {
public ActionForward perform(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
ActionErrors errors = new ActionErrors();
String appName = ((LoginForm) form).getAppName();
//下面是你所需要的一些逻辑
...
HttpSession session = request.getSession();
...
return mapping.findForward("success");
}
}
-----------------------------------------------
2. 写一个bean，专门用来保存select的option集合。代码如下：
-----------------------------------------------
package com.egi.core.ioblock.util;
import java.io.Serializable;
/**
*Description: This class is a bean, used to redivsent one option in an HTML
*drop-down 'select' list. It contains two properties - see {@link
*getDisplayName()} and {@link getInternalId()} for a description. Useful in a
*struts Form class for constructing a select list to pass to the jsp with the
*<tt><html:select></tt> and <tt><html:option></tt> tags.</p> <p>
*@author sjoy
*@created2003年6月4日
*@version1.0
*/
public class HtmlSelectOption implements Serializable {
private String id;
private String displayName;
/**
*Constructor for the HtmlSelectOption object
*/
public HtmlSelectOption() { }
/**
*Constructor for the HtmlSelectOption object
*
*@paramid Description of the Parameter
*@paramdisplayNameDescription of the Parameter
*/
public HtmlSelectOption(String id, String displayName) {
this.id = id;
this.displayName = displayName;
}
public String getDisplayName() {
return displayName;
}
public void setDisplayName(String displayName) {
this.displayName = displayName;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}
-----------------------------------------------
3. ok，接下来从db或者其它地方去取下拉列表中的具体内容；
java.util.Iterator iter = ....;//这里假设从数据库中取得数据
java.util.ArrayList list = new java.util.ArrayList();
String obj;
while(iter.hasNext()){
obj = (String)iter.next();
list.add(new com.egi.core.ioblock.util.HtmlSelectOption(obj,obj));
}
pageContext.setAttribute("appNames", list);
注意：这段逻辑也可以写在ClienetForm中通过javabean的方式在页面上获得这个集合。
4. 然后就是页面上使用啦:)
<html:select property="type">
<html:options collection="appNames" property="id"
labelProperty="displayName"/>
</html:select>
搞定！ |
关键词： struts的一个容易的包含select下拉框的例子