Question

我已将sturts2应用程序配置为使用验证xml进行操作。我也有fieldexpression工作。

是否可以从表达式中的动作调用方法。例如：

<field name="myField">
  <field-validator type="fieldexpression">
    <param name="expression"><![CDATA[
      @com.test.MyClass@isCaptchaOk(keyString, userResponce)
    ]]></param>
    <message>My credit limit should be MORE than my girlfriend's</message>
  </field-validator>
</field>

这是我的实际测试代码，简单的fieldexpression工作，但函数调用没有（参见tbox1）。我不确定@ class @方法路径是否正常，但是不起作用因为，我已经在函数中添加了日志，但没有任何内容出现，所以我认为验证器无法达到函数。

此外，这是否可能，即是允许还是我过于雄心勃勃。

由于

PS我已经纠正了这条消息，我没有交易我的女朋友;-) * ** * validation.xml

<!DOCTYPE validators PUBLIC  
            "-//OpenSymphony Group//XWork Validator 1.0.2//EN"  
            "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">
<validators>
    <field name="tbox1">
        <field-validator type="fieldexpression">
            <param name="expression"><![CDATA[@uk.co.nhbc.userRegistration.action.Test2Action@getString()]]></param>
            <message>function call message here</message>
        </field-validator>
    <field-validator type="fieldexpression">
        <param name="expression"><![CDATA[@uk.co.nhbc.userRegistration.action.Test2Action@isCaptchaOk(tbox1, user.username)]]></param>
        <message>function call message here</message>
    </field-validator>
    </field>
    <field name="tbox2">
        <field-validator type="stringlength">
            <param name="maxLength">5</param>
            <message>length messssage here</message>
        </field-validator>
    </field>
    <field name="user.username">
        <field-validator type="fieldexpression">
            <param name="expression"><![CDATA[(!(tbox2 == "aa" && user.username.equals("")))]]></param>
            <message>tbox2 eq aa and username is empty messssage2 here</message>
        </field-validator>

    </field>

</validators>

** * ** * * java class

package uk.co.nhbc.userRegistration.action;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import uk.co.nhbc.common.action.BaseAction;
import uk.co.nhbc.userRegistration.model.Users;

public class Test2Action extends BaseAction {
    private String tbox1;
    private String tbox2;
    private Users user;
    private static final Log log = LogFactory.getLog(Test2Action.class);

    public String execute() {
        return SUCCESS;
    }

    public String getTbox2() {
        return tbox2;
    }

    public void setTbox2(String tbox2) {
        this.tbox2 = tbox2;
    }

    public String getTbox1() {
        return tbox1;
    }

    public void setTbox1(String tbox1) {
        this.tbox1 = tbox1;
    }

    public Users getUser() {
        log.debug("get user called");
        return user;
    }

    public void setUser(Users user) {
        log.debug("set user called");
        this.user = user;
    }

    public boolean isCaptchaOk(String challenge, String response) {
        //dummy test function
        log.debug("captcha function called");
        if (response.equals("true"))
            return true;
        return false;

    }
    public String getString (){
        log.debug("getString function called");
        return "hello";

    }

}

** * ** * ** *和jsp页面

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib prefix="sj" uri="/struts-jquery-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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<s:form name="formtest" action="Test2Action">
<s:actionerror/>
<s:fielderror></s:fielderror>
<s:textfield name="tbox1" label="box1"></s:textfield>
<s:textfield name="tbox2" label="box1"></s:textfield>
<s:textfield name="user.username" label="boxuser"></s:textfield>
<s:submit></s:submit>
</s:form>
</body>
</html>

Answer 1

为了在表达式中调用静态方法（必须是OGNL），您应该通过在struts.xml文件中添加以下常量来启用struts.ognl.allowStaticMethodAccess：

＆LT;常量名=＆＃34; struts.ognl.allowStaticMethodAccess＆＃34;值=＆＃34;真＆＃34; /＆GT;

Answer 2

请参阅我更新的工作验证程序文件。对于fieldexpression中的字段tbox1，我直接引用该方法，因为它是我的动作，它将在VS上。 tbox1和user.username是jsp页面上的项目（也存在于操作中）

我尝试使用静态方法进行实验，但这不起作用，（现在没时间调查）。希望这有助于并感谢戴夫的投入。

** *更新验证xml

<!DOCTYPE validators PUBLIC  
            "-//OpenSymphony Group//XWork Validator 1.0.2//EN"  
            "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">
<validators>
    <field name="tbox1">
        <field-validator type="fieldexpression">
            <param name="expression"><![CDATA[isCaptchaOk(tbox1, user.username)]]></param>
            <message>function call message here</message>
        </field-validator>
    </field>
    <field name="tbox2">
        <field-validator type="fieldexpression">
            <param name="expression"><![CDATA[(@uk.co.nhbc.userRegistration.action.Test2Action@isFuncOk(tbox2))]]></param>
            <message>func okk function call message here</message>
        </field-validator>
    </field>
    <field name="user.username">
        <field-validator type="fieldexpression">
            <param name="expression"><![CDATA[(!(tbox2 == "aa" && user.username.equals("")))]]></param>
            <message>tbox2 eq aa and username is empty messssage2 here</message>
        </field-validator>

    </field>

</validators>

** *更新了java类

package uk.co.nhbc.userRegistration.action;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import uk.co.nhbc.common.action.BaseAction;
import uk.co.nhbc.userRegistration.model.Users;

public class Test2Action extends BaseAction {
    private String tbox1;
    private String tbox2;
    private Users user;
    private static final Log log = LogFactory.getLog(Test2Action.class);

    public String execute() {
        return SUCCESS;
    }

    public String getTbox2() {
        return tbox2;
    }

    public void setTbox2(String tbox2) {
        this.tbox2 = tbox2;
    }

    public String getTbox1() {
        return tbox1;
    }

    public void setTbox1(String tbox1) {
        this.tbox1 = tbox1;
    }

    public Users getUser() {
        log.debug("get user called");
        return user;
    }

    public void setUser(Users user) {
        log.debug("set user called");
        this.user = user;
    }

    public boolean isCaptchaOk(String challenge, String response) {
        //dummy test function
        log.debug("captcha function called");
        log.debug("captcha function called"+challenge+response);
        if (response.equals("true"))
            return true;
        return false;

    }
    public String getString (){
        log.debug("getString function called");
        return "hello";

    }

    public static boolean isFuncOk (String response){
        log.debug("isFuncOk function called"+response);
        if (response.equals("true"))
            return true;
        return false;

    }

}

我们可以在Struts2 fieldexpression中调用带参数的方法吗？

2 个答案: