ActionForm_空字段问题

<li>空字段测试</li><br>
<form action="blankfield.do" method="post">
姓名：<input type="text" name="username"><br>
<input type="submit" value="提交">
</form>

建立一个BlankFieldActionForm接收空字段

package com.bjsxt.struts;

import org.apache.struts.action.ActionForm;

/**
* 测试空字段
* @author Administrator
*
*/
public class BlankFieldActionForm extends ActionForm {

private String username;

private String password;

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}
}

建立Action：

package com.bjsxt.struts;

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;

/**
* 测试空字段
* @author Administrator
*
*/
public class BlankFieldTestAction extends Action {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {
  return mapping.findForward("success");
}

}

配置：

jsp测试页面：

<body>
<%
BlankFieldActionForm form = (BlankFieldActionForm)request.getAttribute("blankFieldForm");
%>
<li>jsp脚本</li><br>
姓名：<%=form.getUsername() %><br>
密码:<%=form.getPassword() %><br>
<p>
<li>el表达式</li><br>
姓名：${blankFieldForm.username }<br>
密码:${blankFieldForm.password }<br>
</body>

在空字段中jsp脚本得到的是null空对象，而el表达式得到的是一个空字符串。

posted on 2011-02-13 22:06 魔战阅读(308) 评论(0) 收藏举报