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)

<%@ 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>

regist.jsp

<%@ 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>

success.jsp

实体类(UserInfo)

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;

    }

}

UserInfo.java

接下来看一下Action包下的类

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;

    }

}

UserAction.java

<!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>

UserAction-validation.xml

常用验证规则：

编写配置文件(struts.xml)

<!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>

struts.xml

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

巴特西

strus2验证框架

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