strus2验证框架
为什么要用验证框架?
当验证规划比较复杂时,Action类的代码江边的非常繁琐,假如我们要对电话号码进行验证,是非常麻烦的。
验证框架的优点
Struts2中内置了一个验证框架,将常用的验证规则进行了编码实现,使用验证框架时,用户无需再进行编码,只要在外部配置文件中指定某个字段需要进行的验证类型,并提供出错误信息即可,从而大大减轻了开发者的负担,提高开发效率
接下来我们先看一个案例了解一下
jsp页面(以注册为例)
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <%@ taglib uri="/struts-tags" prefix="s"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>注册页面</title> </head> <body> <h2>用户注册</h2> <s:form action="regist" method="post"> <s:textfield name="info.username" label="用户名" ></s:textfield> <br/> <s:textfield name="info.phone" label="电话号码"></s:textfield> <br/> <s:textfield name="info.password" label="密码"></s:textfield> <br/> <s:textfield name="okpwd" label="确认密码"></s:textfield> <br/> <s:submit value="注册"></s:submit> </s:form> </body> </html>
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>成功页面</title> </head> <body> 欢迎您!${info.username } </body> </html>
实体类(UserInfo)
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package cn.happy.entity; public class UserInfo { private String username; private String password; private String phone; public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
接下来看一下Action包下的类
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package cn.happy.action; import cn.happy.entity.UserInfo; import com.opensymphony.xwork2.ActionSupport; public class UserAction extends ActionSupport{ private UserInfo info; private String okpwd; @Override public String execute() throws Exception { return SUCCESS; } public UserInfo getInfo() { return info; } public void setInfo(UserInfo info) { this.info = info; } public String getOkpwd() { return okpwd; } public void setOkpwd(String okpwd) { this.okpwd = okpwd; } }
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN" "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd"> <validators> <!-- 用户名:不能为空 长度在6-10之间 --> <field name="info.username"> <field-validator type="requiredstring"> <param name="trim">true</param> <message>用户名不能为空</message> </field-validator> <field-validator type="stringlength"> <param name="maxLength">10</param> <param name="minLength">6</param> <message>用户名长度必须在${minLength}和${maxLength}之间</message> </field-validator> </field> <!-- 验证密码--> <field name="info.password"> <field-validator type="requiredstring"> <message>密码不能为空</message> </field-validator> </field> <!-- 确认密码 --> <field name="okpwd"> <field-validator type="fieldexpression"> <param name="expression">info.password==okpwd</param> <message>密码和确认密码必须一致</message> </field-validator> </field> <!-- 验证电话号码 --> <field name="info.phone"> <field-validator type="requiredstring"> <message>电话号码不能为空</message> </field-validator> </field> <field name="info.phone"> <field-validator type="regex"> <param name="regex">^(\d{3,4}-){0,1}(\d{7,8})$</param> <message>电话号码格式不正确</message> </field-validator> </field> </validators>
常用验证规则:
编写配置文件(struts.xml)
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <!-- 修改文件 tomact不用重启 --> <constant name="struts.devMode" value="true" /> <package name="default" namespace="/" extends="struts-default"> <action name="regist" class="cn.happy.action.UserAction"> <result name="success">success.jsp</result> <result name="input">regist.jsp</result> </action> </package> </struts>
jar包
实现效果:
实现数据校验的流程
① 对输入的数据首先进行类型转换,并封装成Action属性
② 如果类型转换出现错误,就将错误提示保存到ActionContext,并封装到fieldError中
③ 类型转换执行完毕后,会根据项目的配置执行验证框架的校验,也可能通过执行validate()或者validateXxx()方法进行校验
④ 如果经过以上步骤都没有出现错误,那么将直接调用Action里用于处理用户请求的方法,然后根据结果类型转入相应的视图资源。一旦出现了错误,那么系统将直接返回输入数据的视图资源,后者通常由workflow拦截器处理
更多详情请关注 http://www.cnblogs.com/baixingqiang/