温故知新:struts2_08其他功能:表单验证

其实,struts2的表单验证感觉真的好鸡肋,要不是为了系统的整理一下struts2的功能,根本不会去想它,抽取一个官方的例子吧。

struts2的验证分为客户端和服务端,可以通过注解和配置文件的方式去配置,以下是通过配置文件的方式
定义一个Action,自定义的Action必须继承ActionSupport才能使得校验生效
 1 package validation;
 2 
 3 import java.sql.Date;
 4 
 5 import com.opensymphony.xwork2.ActionSupport;
 6 
 7 
 8 
 9 public class FieldValidatorsExampleAction extends ActionSupport {
10 
11     private static final long serialVersionUID = -4829381083003175423L;
12 
13     private String requiredValidatorField = null;
14     private String requiredStringValidatorField = null;
15     private Integer integerValidatorField = null;
16     private Date dateValidatorField = null;
17     private String emailValidatorField = null;
18     private String urlValidatorField = null;
19     private String stringLengthValidatorField = null;
20     private String regexValidatorField = null;
21     private String fieldExpressionValidatorField = null;
22 
23     public String add(){
24         System.out.println("Add Execute");
25         return "success";
26     }
27     
28     public String validateAdd(){
29         System.out.println("validateAdd Execute");
30         return "input";
31     }
32     
33     public String submit() throws Exception {
34         return "success";
35     }
36 
37     public String input() throws Exception {
38         return "input";
39     }
40 
41     //get/set略
42 }
43 
之后在Action的同级目录下新增客户端校验规则:FieldValidatorsExampleAction-submitClientSideValidationExample-validation.xml
 1 <?xml version="1.0" encoding="ISO-8859-1"?>
 2 
 3 <!DOCTYPE validators PUBLIC
 4           "-//Apache Struts//XWork Validator 1.0//EN"
 5           "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">
 6           
 7 <validators>
 8     <field name="requiredValidatorField">
 9         <field-validator type="required">
10             <message><![CDATA[ required ]]></message>
11         </field-validator>
12     </field>
13     <field name="requiredStringValidatorField">
14         <field-validator type="requiredstring">
15             <param name="trim">true</param>
16             <message key="i18n.nothing.here"><![CDATA[ required and must be string ]]></message>
17         </field-validator>
18     </field>
19     <field name="requiredStringValidatorField">
20         <field-validator type="requiredstring">
21             <param name="trim">true</param>
22             <message key="i18n.requiredstring"><![CDATA[ required and must be string ]]></message>
23         </field-validator>
24     </field>
25     <field name="integerValidatorField">
26         <field-validator type="int">
27             <param name="min">1</param>
28             <param name="max">10</param>
29             <message><![CDATA[ must be integer min 1 max 10 if supplied ]]></message>
30         </field-validator>
31     </field>
32     <field name="dateValidatorField">
33         <field-validator type="date">
34             <param name="min">01/01/1990</param>
35             <param name="max">01/01/2000</param>
36             <message><![CDATA[ must be a min 01-01-1990 max 01-01-2000 if supplied ]]></message>
37         </field-validator>
38     </field>
39     <field name="emailValidatorField">
40         <field-validator type="email">
41             <message><![CDATA[ must be a valid email if supplied ]]></message>
42         </field-validator>
43     </field>
44     <field name="urlValidatorField">
45         <field-validator type="url">
46             <message><![CDATA[ must be a valid url if supplied ]]></message>
47         </field-validator>
48     </field>
49     <field name="stringLengthValidatorField">
50         <field-validator type="stringlength">
51             <param name="maxLength">4</param>
52             <param name="minLength">2</param>
53             <param name="trim">true</param>
54             <message><![CDATA[ must be a String of a specific greater than 1 less than 5 if specified ]]></message>
55         </field-validator>
56     </field>
57     <field name="regexValidatorField">
58         <field-validator type="regex">
59             <param name="regex">.*\.txt</param>
60             <message><![CDATA[ regexValidatorField must match a regexp (.*\.txt) if specified ]]></message>
61         </field-validator>
62     </field>
63     <field name="fieldExpressionValidatorField">
64         <field-validator type="fieldexpression">
65             <param name="expression">(fieldExpressionValidatorField == requiredValidatorField)</param>
66             <message><![CDATA[ must be the same as the Required Validator Field if specified ]]></message>
67         </field-validator>
68     </field>
69 </validators>
70 
还有服务端校验规则:FieldValidatorsExampleAction-submitFieldValidatorsExamples-validation.xml
 1 <?xml version="1.0" encoding="ISO-8859-1"?>
 2 
 3 <!DOCTYPE validators PUBLIC 
 4           "-//Apache Struts//XWork Validator 1.0//EN"
 5           "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">
 6           
 7 <validators>
 8     <field name="requiredValidatorField">
 9         <field-validator type="required">
10             <message><![CDATA[ required ]]></message>
11         </field-validator>
12     </field>
13     <field name="requiredStringValidatorField">
14         <field-validator type="requiredstring">
15             <param name="trim">true</param>
16             <message><![CDATA[ required and must be string ]]></message>
17         </field-validator>
18     </field>
19     <field name="integerValidatorField">
20         <field-validator type="int">
21             <param name="min">1</param>
22             <param name="max">10</param>
23             <message><![CDATA[ must be integer min 1 max 10 if supplied ]]></message>
24         </field-validator>
25     </field>
26     <field name="dateValidatorField">
27         <field-validator type="date">
28             <param name="min">01/01/1990</param>
29             <param name="max">01/01/2000</param>
30             <message><![CDATA[ must be a min 01-01-1990 max 01-01-2000 if supplied ]]></message>
31         </field-validator>
32     </field>
33     <field name="emailValidatorField">
34         <field-validator type="email">
35             <message><![CDATA[ must be a valid email if supplied ]]></message>
36         </field-validator>
37     </field>
38     <field name="urlValidatorField">
39         <field-validator type="url">
40             <message><![CDATA[ must be a valid url if supplied ]]></message>
41         </field-validator>
42     </field>
43     <field name="stringLengthValidatorField">
44         <field-validator type="stringlength">
45             <param name="maxLength">4</param>
46             <param name="minLength">2</param>
47             <param name="trim">true</param>
48             <message><![CDATA[ must be a String of a specific greater than 1 less than 5 if specified ]]></message>
49         </field-validator>
50     </field>
51     <field name="regexValidatorField">
52         <field-validator type="regex">
53             <param name="regex"><![CDATA[ [^<>]+ ]]></param>
54             <message><![CDATA[ regexValidatorField must match a regexp (.*\.txt) if specified ]]></message>
55         </field-validator>
56     </field>
57     <field name="fieldExpressionValidatorField">
58         <field-validator type="fieldexpression">
59             <param name="expression">(fieldExpressionValidatorField == requiredValidatorField)</param>
60             <message><![CDATA[ must be the same as the Required Validator Field if specified ]]></message>
61         </field-validator>
62     </field>
63 </validators>
输入页面:fieldValidatorsExample.jsp
 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@taglib prefix="s" uri="/struts-tags" %>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 
 6 <html>
 7 <head>
 8     <title>Struts2 Showcase - Validation - Field Validators Example</title>
 9 </head>
10 <body>
11 
12 <div class="page-header">
13     <h1>Field Validation Examples</h1>
14 </div>
15 
16 <div class="container-fluid">
17     <div class="row-fluid">
18         <div class="span12">
19 
20             <h3>All Field Errors Will Appear Here</h3>
21             <s:fielderror/>
22             <hr/>
23 
24             <h3>Field Error due to 'Required String Validator Field' Will Appear Here</h3>
25             <s:fielderror>
26                 <s:param value="%{'requiredStringValidatorField'}"/>
27             </s:fielderror>
28             <hr/>
29 
30             <h3>Field Error due to 'String Length Validator Field' Will Appear Here</h3>
31             <s:fielderror>
32                 <s:param>stringLengthValidatorField</s:param>
33             </s:fielderror>
34             <hr/>
35 
36             <s:form action="submitFieldValidatorsExamples" namespace="/validation" method="POST" theme="xhtml">
37                 <s:textfield label="Required Validator Field" name="requiredValidatorField"/>
38                 <s:textfield label="Required String Validator Field" name="requiredStringValidatorField"/>
39                 <s:textfield label="Integer Validator Field" name="integerValidatorField"/>
40                 <s:textfield label="Date Validator Field" name="dateValidatorField"/>
41                 <s:textfield label="Email Validator Field" name="emailValidatorField"/>
42                 <s:textfield label="URL Validator Field" name="urlValidatorField"/>
43                 <s:textfield label="String Length Validator Field" name="stringLengthValidatorField"/>
44                 <s:textfield label="Regex Validator Field" name="regexValidatorField"/>
45                 <s:textfield label="Field Expression Validator Field" name="fieldExpressionValidatorField"/>
46                 <s:submit label="Submit" cssClass="btn btn-primary"/>
47             </s:form>
48             
49             <s:form action="addFieldValidatorsExamples" namespace="/validation" method="POST" theme="xhtml">
50                 <s:submit value="add"/>
51             </s:form>
52 
53         </div>
54     </div>
55 </div>
56 </body>
57 </html>
58 
结果页面:successFieldValidatorsExample.jsp
 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@taglib prefix="s" uri="/struts-tags" %>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 
 6 <html>
 7 <head>
 8     <title>Struts2 Showcase - Validation - Success Field Validators Example</title>
 9     <s:head/>
10 </head>
11 <body>
12 
13 <div class="page-header">
14     <h1>Success !</h1>
15 </div>
16 
17 <div class="container-fluid">
18     <div class="row-fluid">
19         <div class="span12">
20 
21             <table class="table table-striped table-bordered table-hover table-condensed">
22             <tr>
23                 <td>Required Validator Field:</td>
24                 <td><s:property value="requiredValidatorField" /></td>
25             </tr>
26             <tr>
27                 <td>Required String Validator Field:</td>
28                 <td><s:property value="requiredStringValidatorField" /></td>
29             </tr>
30             <tr>
31                 <td>Integer Validator Field: </td>
32                 <td><s:property value="integerValidatorField" /></td>
33             </tr>
34             <tr>
35                 <td>Date Validator Field: </td>
36                 <td><s:property value="dateValidatorField" /></td>
37             </tr>
38             <tr>
39                 <td>Email Validator Field: </td>
40                 <td><s:property value="emailValidatorField" /></td>
41             </tr>
42             <tr>
43                 <td>String Length Validator Field: </td>
44                 <td><s:property value="stringLengthValidatorField" /></td>
45             </tr>
46             <tr>
47                 <td>Regex Validator Field: <s:property value="regexValidatorField" /></td>
48                 <td>Field Expression Validator Field: <s:property value="fieldExpressionValidatorField" /></td>
49             </tr>
50         </table>
51         
52         </div>
53     </div>
54 </div>
55 </body>
56 </html>
57 
struts.xml:
 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5     
 6 <struts>
 7 
 8     <package name="validationExamples" extends="struts-default" namespace="/validation" >
 9 
10         <!-- ======================== -->
11         <!-- === Field Validators === -->
12         <!-- ======================== -->
13         
14         <action name="showFieldValidatorsExamples" class="validation.FieldValidatorsExampleAction" method="input">
15             <result name="input" type="dispatcher">/fieldValidatorsExample.jsp</result>
16         </action>
17         
18         <action name="submitFieldValidatorsExamples" class="validation.FieldValidatorsExampleAction" method="submit">
19             <result name="input" type="dispatcher">/fieldValidatorsExample.jsp</result>
20             <result type="dispatcher">/successFieldValidatorsExample.jsp</result>
21         </action>
22         
23         <action name="addFieldValidatorsExamples" class="validation.FieldValidatorsExampleAction" method="add">
24             <result name="input" type="dispatcher">/successFieldValidatorsExample.jsp</result>
25         </action>
26                 
27     </package>
28 </struts>
29     
30 

个人感觉这个校验框架做得比较笨重,很多配置,而且必须要配合struts2的标签才可以使用,显得很不灵活。如果需要使用struts2的校验功能,我们或许可以选择他提供的另一种办法,就是针对某个方法的校验,比如方法add,自定义一个方法validateAdd,那么执行add方法之前会自动执行validateAdd方法进行自定义的校验,同理其他方法就需要定义以“validate”+“方法名”(大写首字母)来命名的方法来校验,校验完毕之后你可以选择使用在ActionFieldError中添加错误信息,配合struts2的标签来显示,或者自行处理。

posted on 2014-11-03 09:50 都较瘦 阅读(143) 评论(0)  编辑  收藏 所属分类: MVCFramework


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