为什么“必填”字段验证器不能处理 Struts 2 中的空白值？

问题描述 投票：0回答：1

我正在构建一个登录应用程序（在 Netbeans 731 中），它基本上确保 

username
和 
password
的非空值。应用程序运行良好，但验证不起作用，因此即使用户输入空白值，它们也会移至 
Thanks.jsp
页面。在尝试将其构建为 Netbeans Web 应用程序后，我使用 Maven 重新构建了该应用程序，目录结构如下：

enter image description here

生成的war文件为：

enter image description here

pom.xml
:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0     http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.manaar</groupId>
<artifactId>Maven8a2</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>

<name>Maven8a2</name>

<properties>
    <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>6.0</version>
        <scope>provided</scope>
    </dependency>
    
    
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-core</artifactId>
        <version>2.3.15.1</version>
    </dependency>
    
    
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.14</version>
    </dependency>


</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
                <compilerArguments>
                    <endorseddirs>${endorsed.dir}</endorseddirs>
                </compilerArguments>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.1.1</version>
            <configuration>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>2.1</version>
            <executions>
                <execution>
                    <phase>validate</phase>
                    <goals>
                        <goal>copy</goal>
                    </goals>
                    <configuration>
                        <outputDirectory>${endorsed.dir}</outputDirectory>
                        <silent>true</silent>
                        <artifactItems>
                            <artifactItem>
                                <groupId>javax</groupId>
                                <artifactId>javaee-endorsed-api</artifactId>
                                <version>6.0</version>
                                <type>jar</type>
                            </artifactItem>
                        </artifactItems>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

</project>


web/jsp/Required.jsp
:

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>required Validator Example</title>
<style type="text/css">@import url(css/main.css);</style>
<style>
  .errorMessage {
color:red;
 }
</style>
</head>
<body>
<div id="global" style="width:350px">
<h3>Enter user name and password</h3>
<s:fielderror/>
<s:form action="Required2">
<s:textfield name="userName" label="User Name"/>

    <s:password name="password" label="Password"/>
    <s:submit/>
</s:form>
</div>
</body>
</html>


web/jsp/Thanks.jsp
:

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Thank you</title>
<style type="text/css">@import url(css/main.css);</style>
</head>
<body>
<div id="global">
Thank you
</div>
</body>
</html>


WEB-INF/classes/app08a/RequiredTestAction.class
:

package app08a;
import com.opensymphony.xwork2.ActionSupport;

public class RequiredTestAction extends ActionSupport {
private String userName;
private String password;
public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}
public String getUserName() {
    return userName;
}
public void setUserName(String userName) {
    this.userName = userName;
}
}


WEB-INF/classes/app08a/RequiredTestAction-validation.xml
:

<!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>Please enter a user name</message>
    </field-validator>
</field>
<field name="password">
    <field-validator type="requiredstring">
        <message>Please enter a password</message>
    </field-validator>
</field>
</validators>


WEB-INF/classes/struts.xml
:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />

<package name="app08a" extends="struts-default">

    <action name="Required1">
        <result>/jsp/Required.jsp</result>
    </action>
    <action name="Required2" class="app08a.RequiredTestAction">
        <result name="input">/jsp/Required.jsp</result>
        <result>/jsp/Thanks.jsp</result>
    </action>

</package>

</struts>


WEB-INF/web.xml
:

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee    /web-app_2_5.xsd"
version="2.5"> 

<filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<!-- Restrict direct access to JSPs. 
     For the security constraint to work, the auth-constraint
     and login-config elements must be present -->
<security-constraint>
    <web-resource-collection>
        <web-resource-name>JSPs</web-resource-name>
        <url-pattern>/jsp/*</url-pattern>
    </web-resource-collection>
    <auth-constraint/>
</security-constraint>

<login-config>
    <auth-method>BASIC</auth-method>
</login-config>
</web-app>

当我手动构建此应用程序（使用 Maven）时，由于 DTD 标签版本错误，它给出了堆栈跟踪。使用 Maven 构建应用程序后，我不再收到此错误。

运行此应用程序时，我调用 

Required1.action
。即使我不输入密码，它也会直接跳到 
Action2
并且验证拦截器 (
RequiredTestAction-validation.xml
) 似乎不起作用。

java jsp netbeans struts2
1个回答
1
投票

必需的验证器是基本验证器类型，它检查 

null
字段值。如果您在输入字段中输入空白字符，则可能无法正常工作。请改用 
requiredstring
验证器。

<field name="userName">
    <field-validator type="requiredstring">
        <message>Please enter a user name</message>
    </field-validator>
</field>
<field name="password">
    <field-validator type="requiredstring">
        <message>Please enter a password</message>
    </field-validator>
</field>

动作类扩展了

ActionSupport
，它具有在动作执行后返回结果所需的
Action
接口的默认实现。包扩展了 
struts-default
，它具有 
<default-interceptor-ref name="defaultStack"/>
并继承到您的包。

此外，自 Struts 2.1.3 起，

FilterDispatcher 已被弃用。 

    

    

    


  

  

    
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