空字段测试
* 在表单中没有input输入域，jsp脚本接收到的值为null，el表达式接收到的值为空串
* 如果表单中的值，没有输入，那么jsp脚本和el表达式接收到的值都为空串
1、BlankFieldActionForm.java
Code
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;
}
}
2、BlankFieldTestAction.java
Code
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");
}
}
3、配置Struts-config.xml插入
<form-bean name="blankFieldForm" type="com.bjsxt.struts.BlankFieldActionForm"/>
和
Code
<action path="/blankfield"
type="com.bjsxt.struts.BlankFieldTestAction"
name="blankFieldForm"
scope="request"
>
<forward name="success" path="/blankfield_success.jsp"/>
</action> 4、blankfield_success.jsp
·引入相关的类
<%@ page import="com.bjsxt.struts.*" %>
·详细代码，输出空串
Code
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<%@ page import="com.bjsxt.struts.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
</head>
<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>
</html>
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