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struts 数据 验证

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用户提交数据是需要验证才能保证程序运行安全。
Struts 数据验证简单分为：

  • 表单验证
  • 业务验证


验证基本过程是：

  1. 创建消息资源文件
    2. # Resources for parameter 'demo.ApplicationResources'
# Project strutsprj2

#username.null=用户名不能为空!
#userpass.null=密码不能为空!
#userpass.len=密码不能小于8位!
#username.exist=用户名已被占用!

#特殊标记：用于设置消息格式
errors.header=<font color="red"><b>
errors.footer=</b></font>

username.null=\u7528\u6237\u540d\u4e0d\u80fd\u4e3a\u7a7a!
userpass.null=\u5bc6\u7801\u4e0d\u80fd\u4e3a\u7a7a!
userpass.len=\u5bc6\u7801\u4e0d\u80fd\u5c0f\u4e8e8\u4f4d!
username.exist=\u7528\u6237\u540d\u5df2\u88ab\u5360\u7528!
  2. 修改表单bean的validate()方法，添加验证代码
    3. //....
	/** 
	 * 表单验证 验证表单数据
	 * @param mapping
	 * @param request
	 * @return ActionErrors
	 */
	public ActionErrors validate(ActionMapping mapping,
			HttpServletRequest request) {
		// TODO Auto-generated method stub
		ActionErrors errors = new ActionErrors();
		//验证 用户名是否为空
		if (user.getUserName().length() < 1) {
			ActionMessage msg=new ActionMessage("username.null");
            errors.add("username",msg);
		}
		//验证 用户密码是否大于 8 位
		if (user.getUserPass().length() < 8) {
			ActionMessage msg=new ActionMessage("userpass.len");
            errors.add("userpass",msg);
		}
		//返回null或返回空的消息集合，代表验证通过.
		return errors;
	}
//....
  3. 修改struts-config.xml，添加如下属性
    4.     <!-- validate 是否要进行验证  -->
    <!-- input 验证失败后跳转的页面 -->
    <action
      validate="true"  
      input="/index.jsp"  
      attribute="loginForm"
      name="loginForm"
      path="/login"
      scope="request"
      type="cn.net.royakon.action.LoginAction">
      <forward name="result" path="/result.jsp" />
      <forward name="fail" path="/index.jsp" />
    </action>
  4. 显示错误消息
    5. <%@ page language="java" pageEncoding="GB2312"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<form action="login.do" method="post">
	USERNAME
	<input type="text" name="user.userName" />
	<!-- 添加显示错误的标签 -->
	<html:errors property="username"/>
	</br>
	USERPASS
	<input type="text" name="user.userPass" />
	<!-- 添加显示错误的标签 -->
	<html:errors property="userpass"/>
	</br>
	<input type="submit" value="登陆" />
</form>
  5. 添加业务验证
    6. //....
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		LoginForm loginForm = (LoginForm) form;
		// TODO Auto-generated method stub
		User user = loginForm.getUser();
		LoginModel model = new LoginModel();
		//业务验证
		if (model.isExist(user)) {
			//生成消息
			ActionErrors errors=new ActionErrors();
			ActionMessage msg=new ActionMessage("username.exist");
			errors.add("username",msg);
			super.saveErrors(request, errors);
			return mapping.findForward("fail");
		}
		else {
			request.setAttribute("result", "Sucess!");
			return mapping.findForward("result");
		}
	}
//....

Categories: 网页编程

Tagged as:

RoyAkon