春季-处理多个验证注释错误消息

发布时间：2020-12-15 01:22:43 所属栏目：大数据来源：网络整理

导读：我正在尝试使用注释在SpringMVC中进行验证我为一个字段使用了2个注释来验证 @NotEmpty(message =“ required”) @Size(min =“ 3” max =“ 8” message =“超出范围”) 私有字符串密码；我面临的问题是,当该字段保留为空白时,它会同时显示两条错误消息(*

我正在尝试使用注释在SpringMVC中进行验证…

我为一个字段使用了2个注释来验证

@NotEmpty(message =“ required”)

@Size(min =“ 3” max =“ 8” message =“超出范围”)

私有字符串密码；

我面临的问题是,当该字段保留为空白时,它会同时显示两条错误消息(*为必填项,并且超出范围).但是我想显示这些错误消息之一,而不是全部…

一条消息可以限制吗？如果是这样,这种情况有什么可能性？

任何建议和指导表示赞赏..在此先感谢…

最佳答案

我也遇到过同样的问题,因此我创建了自定义错误标签,该标签仅显示第一个错误-随时可以使用它：

a]创建自定义标签类

package cz.devmint.springext.web.tags.form;

import javax.servlet.jsp.JspException;

import org.apache.commons.lang.StringUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.web.servlet.tags.form.ErrorsTag;
import org.springframework.web.servlet.tags.form.TagWriter;

public class ErrorsTagExt extends ErrorsTag {

private boolean firstErrorOnly = true;

public boolean isFirstErrorOnly() {
    return firstErrorOnly;
}

public void setFirstErrorOnly(boolean firstErrorOnly) {
    this.firstErrorOnly = firstErrorOnly;
}

@Override
protected void renderDefaultContent(TagWriter tagWriter) throws JspException {
    tagWriter.startTag(getElement());
    writeDefaultAttributes(tagWriter);
    String delimiter = ObjectUtils.getDisplayString(evaluate("delimiter",getDelimiter()));
    String[] errorMessages = getBindStatus().getErrorMessages();
    for(int i = 0; i < errorMessages.length; i++) {
        String errorMessage = errorMessages[i];
        if (i > 0) {
            tagWriter.appendValue(delimiter);
        }
        tagWriter.appendValue(getDisplayString(errorMessage));
        if (firstErrorOnly) break;
    }
    tagWriter.endTag();
}

b]要使用自定义标签,您必须创建标签库描述符-您只需从spring的标签库描述符(位于META-INF目录中的spring-webmvc-3.2.1.RELEASE.jar,名称为spring-form.tld)中复制ErrorsTag声明即可. ),然后添加您自己的属性firstErrorOnly.以下是从我的库中提取的完整示例-请参阅代码中的注释,哪些内容可以更改和自定义：

<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">

<description>Custom extension to Spring Framework JSP Tag Library</description>
<tlib-version>3.0</tlib-version>
<short-name>tags</short-name>
<!-- use your own uri -->
<uri>http://cz.devmint.spring-ext/tags</uri>
<tag>
    <description>Renders field errors in an HTML 'span' tag.</description>
    <name>errors</name>
    <!-- use your own package - fully qualified name of your tag class  -->
    <tag-class>cz.devmint.springext.web.tags.form.ErrorsTagExt</tag-class>
    <body-content>JSP</body-content>
    <variable>
        <name-given>messages</name-given>
        <variable-class>java.util.List</variable-class>
    </variable>
    <!-- this attribute declaration is the only change when compare with spring's original tag definition -->   
    <attribute>
        <description>Whether to render the first error for given field only</description>
        <name>firstErrorOnly</name>
        <required>false</required>
        <rtexprvalue>false</rtexprvalue>
    </attribute>
    <attribute>
        <description>Path to errors object for data binding</description>
        <name>path</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Standard Attribute</description>
        <name>id</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>Enable/disable HTML escaping of rendered values.</description>
        <name>htmlEscape</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>Delimiter for displaying multiple error messages. Defaults to the br tag.</description>
        <name>delimiter</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>Equivalent to "class" - HTML Optional Attribute</description>
        <name>cssClass</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>Equivalent to "style" - HTML Optional Attribute</description>
        <name>cssStyle</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Standard Attribute</description>
        <name>lang</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Standard Attribute</description>
        <name>title</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Standard Attribute</description>
        <name>dir</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Standard Attribute</description>
        <name>tabindex</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>onclick</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>ondblclick</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>onmousedown</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>onmouseup</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>onmouSEOver</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>onmousemove</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>onmouSEOut</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>onkeypress</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>onkeyup</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>HTML Event Attribute</description>
        <name>onkeydown</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
        <description>Specifies the HTML element that is used to render the enclosing errors.</description>
        <name>element</name>
        <required>false</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
    <dynamic-attributes>true</dynamic-attributes>
</tag>
</taglib>

将此xml文件放入WEB-INF / tld / spring-ext.tld

在jsp页面上添加声明：

<%@taglib prefix="spring-ext" uri="http://cz.devmint.spring-ext/tags" %>

使用自定义标签代替spring的ErrorsTag：

<spring-ext:errors path="dummy" firstErrorOnly="true" />

（编辑：李大同）

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