使用Struts2验证框架实现输入校验

来源：互联网发布：高性能并发网络框架编辑：程序博客网时间：2024/06/12 01:50

学习了《Struts2权威指南》中关于Struts2的输入校验，自己动手测试了一把，也遇到一些问题，在这里记录一下。直接看代码：

[xhtml] view plain copy

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!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=UTF-8">
<title></title>
</head>
<body>
<s:form action="login" validate="true">
<s:textfield name="username" label="用户名"></s:textfield>
<s:password name="password" label="密码"></s:password>
<s:submit value="提交"></s:submit>
</s:form>
</body>
</html>

LoginAction.java

[java] view plain copy

package com.petrochina.action.system;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private String username;//用户名
private String password;//密码
@Override
public String execute() throws Exception {
if (getUsername().equals("admin") && getPassword().equals("admin")) {
return SUCCESS;
} else {
return INPUT;
}
}
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;
}
}

校验文件LoginAction-validation.xml,其生成路径要和LoginAction.class在一起.

[xhtml] view plain copy

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
<validators>
<field name="username">
<field-validator type="requiredstring">
<message key="user.required"/>
</field-validator>
</field>
<field name="password">
<field-validator type="requiredstring">
<message key="pass.required"></message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">3</param>
<param name="maxLength">6</param>
<message key="pass.length"></message>
</field-validator>
</field>
</validators>

struts.xml

[xhtml] view plain copy

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<constant name="struts.custom.i18n.resources" value="messageResource"/>
<constant name="struts.i18n.reload" value="true"/>
<constant name="struts.i18n.encoding" value="UTF-8"/>
<package name="mystruts" extends="struts-default">
<action name="login" class="com.petrochina.action.system.LoginAction">
<result name="success">/welcome.jsp</result>
<result name="input">/login.jsp</result>
</action>
</package>
</struts>

国际化资源文件messageResource_zh_CN.properties

[xhtml] view plain copy

#struts校验
user.required=用户名不能为空
pass.required=密码不能为空
pass.length=密码必须是3到6位

文件结构：

登录页面:

不输入任何内容,点击"提交",效果如下:

可见对LoginAction中的password属性定义的两个校验器都起作用了,但如果这两个校验信息同时显示有点冗余,此时可以通过设置short-circuit="true"来配置校验器短路.修改后的LoginAction-validation.xml中password字段的定义如下:

[xhtml] view plain copy

<field name="password">
<field-validator type="requiredstring" short-circuit="true">
<message key="pass.required"></message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">3</param>
<param name="maxLength">6</param>
<message key="pass.length"></message>
</field-validator>
</field>

这样如果密码为空就提交的话只会提示"密码不能为空",效果如下:

PS：直接访问jsp页面(http://localhost:8080/struts/login.jsp)会报错:

但是通过action(http://localhost:8080/struts/login.action)就可以正常访问,去掉struts的客户端验证(在jsp页面的form表单中去掉validate="true"属性)也可以正常访问.在网上查了一下资料,大家的解决方法都是走action.个人觉得原因是:通过Action访问Struts2会加载LoginAction-validation.xml,从而读取配置的校验器信息,根据配置的校验器信息生成客户端校验脚本(Javascript),如果直接访问jsp页面那么就获取不到校验器信息(Method public java.util.List org.apache.struts2.components.Form.getValidators(java.lang.String) threw an exception when invoked on org.apache.struts2.components.Form@18db6e1 - Class: freemarker.ext.beans.SimpleMethodModel),从而无法生成客户端脚本.

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