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Thymeleaf 3.0 自定義標(biāo)簽方言屬性的實(shí)例講解

更新時(shí)間：2020年09月18日 13:26:06 作者：Garc

這篇文章主要介紹了Thymeleaf 3.0 自定義標(biāo)簽方言屬性的實(shí)例講解，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。一起跟隨小編過來看看吧

此篇文章內(nèi)容僅限于描述 thy3.0 自定義標(biāo)簽的說明，所以你在看之前，請(qǐng)先會(huì)使用它。

直奔主題，以下代碼是如何引用第三方標(biāo)簽的。說明： shrioDialect 是Shiro 官方為thy開發(fā)的自定義標(biāo)簽工具。和jsp的一樣

RiskDialect 是我寫的自定義標(biāo)簽

 <bean id="templateEngine" class="org.thymeleaf.spring3.SpringTemplateEngine">
     <property name="templateResolver" ref="templateResolver"/>
     <property name="additionalDialects">
    <set>
      <!-- thymeleaf 使用shiro標(biāo)簽 -->
     <bean class="at.pollux.thymeleaf.shiro.dialect.ShiroDialect"/>
     <bean class="com.hpay.risk.boss.common.RiskDialect"/>
    </set>
  </property>
 </bean>

首先看代碼：

import java.util.LinkedHashSet;
import java.util.Set; 
import org.thymeleaf.dialect.AbstractProcessorDialect;
import org.thymeleaf.processor.IProcessor;
import org.thymeleaf.standard.StandardDialect;
 
/**
 *@author Garc
 *@Date 2017年2月16日 上午11:42:51
 *@info thymeleaf 自定義標(biāo)簽屬性
 *@snise
 **/
public class RiskDialect extends AbstractProcessorDialect {
 
  private static final String NAME = "Risk";
  private static final String PREFIX = "risk";
 
  public RiskDialect() {
    super(NAME, PREFIX, StandardDialect.PROCESSOR_PRECEDENCE);
  }
 
 @Override
 public Set<IProcessor> getProcessors(String dialectPrefix) {
 return createStandardProcessorsSet(dialectPrefix);
 }
 
 private Set<IProcessor> createStandardProcessorsSet(String dialectPrefix) {
 LinkedHashSet<IProcessor> processors = new LinkedHashSet<IProcessor>();
 processors.add(new SansitiveEncryptProcessor(dialectPrefix));
 return processors;
 }
 
}

我定義了 RiskDialect 類，并需要繼承 thymeleaf 官方方言類

我定義的這個(gè)是為了做敏感數(shù)據(jù)加密用的。這是前段代碼。

以下是實(shí)現(xiàn)自定義標(biāo)簽方言代碼：

import static at.pollux.thymeleaf.shiro.processor.ThymeleafFacade.evaluateAsStringsWithDelimiter;
import static at.pollux.thymeleaf.shiro.processor.ThymeleafFacade.getRawValue;
 
import java.util.List; 
import org.thymeleaf.context.ITemplateContext;
import org.thymeleaf.engine.AttributeName;
import org.thymeleaf.model.IModel;
import org.thymeleaf.model.IModelFactory;
import org.thymeleaf.model.IProcessableElementTag;
import org.thymeleaf.processor.element.AbstractAttributeTagProcessor;
import org.thymeleaf.processor.element.IElementTagStructureHandler;
import org.thymeleaf.templatemode.TemplateMode;
import org.unbescape.html.HtmlEscape;
 
import com.hpay.utils.StringUtils;
 
/**
 *@author Garc
 *@Date 2017年2月16日 上午11:48:34
 *@info 敏感加密標(biāo)簽
 *@snise
 **/
public class SansitiveEncryptProcessor extends AbstractAttributeTagProcessor{
 
  private static final String DELIMITER = ",";
  private static final String ATTRIBUTE_NAME = "sansiEncrypt";
  private static final int PRECEDENCE = 300;
  
  private static final String CARD="card";
  private static final String MOBILE="mobile";
  private static final String IDENTITY="identity";
  private static final String CSN="csn";
  
 protected SansitiveEncryptProcessor( String dialectPrefix) {
 super(
        TemplateMode.HTML, // 處理thymeleaf 的模型
        dialectPrefix, // 標(biāo)簽前綴名
        null, // No tag name: match any tag name
        false, // No prefix to be applied to tag name
        ATTRIBUTE_NAME, // 標(biāo)簽前綴的 屬性 例如：< risk:sansiEncrypt="">
        true, // Apply dialect prefix to attribute name
        PRECEDENCE, // Precedence (inside dialect's precedence)
        true); // Remove the matched attribute afterwards
    }
 
 @Override
 protected void doProcess(ITemplateContext context,
  IProcessableElementTag tag, AttributeName attributeName,
  String attributeValue, IElementTagStructureHandler structureHandler) {
 
        final String rawValue = getRawValue(tag, attributeName); //獲取標(biāo)簽內(nèi)容表達(dá)式
 String type=null;
 String exper=null;
 if(StringUtils.isNotBlank(rawValue)){
  type=rawValue.split(":")[0]; //獲取類型
  exper=rawValue.split(":")[1]; //獲取表達(dá)式
 }
 //通過IStandardExpression 解析器 解析表達(dá)式獲取參數(shù)
     final List<String> values = evaluateAsStringsWithDelimiter(context, exper, DELIMITER);
     final String elementCompleteName = tag.getElementCompleteName(); //標(biāo)簽名
     //創(chuàng)建模型
     final IModelFactory modelFactory = context.getModelFactory();
     final IModel model = modelFactory.createModel();
     //添加模型 標(biāo)簽
     model.add(modelFactory.createOpenElementTag(elementCompleteName));
     for (String value : values) {
     //創(chuàng)建 html5標(biāo)簽 文本返回?cái)?shù)據(jù)
     if(CARD.equals(type)){
      model.add(modelFactory.createText(HtmlEscape.escapeHtml5(getCardNo(value))));
     }else if(MOBILE.equals(type)){
      model.add(modelFactory.createText(HtmlEscape.escapeHtml5(getMobile(value))));
     }else if(IDENTITY.equals(type)){
      model.add(modelFactory.createText(HtmlEscape.escapeHtml5(getIdentity(value))));
     }else if(CSN.equals(type)){
      model.add(modelFactory.createText(HtmlEscape.escapeHtml5(getCsn(value))));
     }
  }
     //添加模型 標(biāo)簽
     model.add(modelFactory.createCloseElementTag(elementCompleteName));
     //替換頁面標(biāo)簽
     structureHandler.replaceWith(model, false);
 }
 
 protected String getCardNo(String cardNo) {
 if (StringUtils.isNotBlank(cardNo) && cardNo.length() >= 9) {
  return cardNo.substring(0, 4) + cardNo.substring(4, cardNo.length() - 3).replaceAll("[0-9]", "*") + cardNo.substring(cardNo.length() - 4, cardNo.length());
 }
 return cardNo;
 }
  
    protected static String getIdentity(String val){
       if(org.apache.commons.lang.StringUtils.isBlank(val)||val.length()<9){
 return val;
     }else{
     return val.substring(0, 4)+ val.substring(4, val.length()-4).replaceAll("[0-9]", "*") + val.substring(val.length()-4, val.length());
     }
    }
  /**
   * 前四后四顯示
   * @param val
   * @return
   */
  protected static String getMobile(String val){
 if(org.apache.commons.lang.StringUtils.isBlank(val)||val.length()<9){
  return val;
   }else{
   return val.substring(0, 3)+ val.substring(4, val.length()-3).replaceAll("[0-9]", "*") + val.substring(val.length()-4, val.length());
   }
 }
  /**
   * 星星顯示
   * @param val
   * @return
   */
  protected String getCsn(String val){
 if(org.apache.commons.lang.StringUtils.isBlank(val)||val.length()<12){
   return val;
   }else{
   return val.substring(0, 2)+ val.substring(2, val.length()-3).replaceAll("[0-9a-zA-Z]", "*") + val.substring(val.length()-6, val.length());
   }
   }
}

以下代碼是為了向SansitiveEncryptProcessor 提供的解析表達(dá)式 thymeleaf解析器，用來獲取參數(shù)值的：

import org.thymeleaf.context.ITemplateContext;
import org.thymeleaf.engine.AttributeName;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.model.IProcessableElementTag;
import org.thymeleaf.standard.expression.IStandardExpression;
import org.thymeleaf.standard.expression.IStandardExpressionParser;
import org.thymeleaf.standard.expression.StandardExpressionParser;
import org.thymeleaf.util.EvaluationUtils;
import org.thymeleaf.util.StringUtils;
 
import java.util.ArrayList;
import java.util.List;
 
import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableList;
import static org.thymeleaf.util.StringUtils.trim;
import static org.thymeleaf.util.Validate.notEmpty;
import static org.thymeleaf.util.Validate.notNull;
 
public final class ThymeleafFacade {
 
  private ThymeleafFacade() {
    throw new UnsupportedOperationException();
  }
 
  public static String getRawValue(final IProcessableElementTag element, final AttributeName attributeName) {
    notNull(element, "element must not be null");
    notNull(attributeName, "attributeName must not be empty");
 
    final String rawValue = trim(element.getAttributeValue(attributeName));
    notEmpty(rawValue, "value of '" + attributeName + "' must not be empty");
 
    return rawValue;
  }
 
  public static String getRawValue(final IProcessableElementTag element, final String attributeName) {
    notNull(element, "element must not be null");
    notEmpty(attributeName, "attributeName must not be empty");
 
    final String rawValue = trim(element.getAttributeValue(attributeName));
    notEmpty(rawValue, "value of '" + attributeName + "' must not be empty");
 
    return rawValue;
  }
 
  public static Object evaluateExpression(ITemplateContext arguments, String expression) throws TemplateProcessingException {
    notNull(arguments, "arguments must not be null");
    notEmpty(expression, "expression must not be empty");
 
    final IStandardExpressionParser parser = new StandardExpressionParser();
 
    final IStandardExpression evaluableExpression = parser.parseExpression(arguments, expression);
 
    return evaluableExpression.execute(arguments);
  }
 
  public static List<Object> evaluateAsIterable(ITemplateContext arguments, String rawValue) throws TemplateProcessingException {
    notNull(arguments, "arguments must not be null");
    notEmpty(rawValue, "rawValue must not be empty");
 
    final Object evaluatedExpression = evaluateExpression(arguments, rawValue);
 
    return EvaluationUtils.evaluateAsList(evaluatedExpression);
  }
 
  public static List<Object> evaluateAsIterableOrRawValue(ITemplateContext arguments, String rawValue) {
    notNull(arguments, "arguments must not be null");
    notEmpty(rawValue, "rawValue must not be empty");
 
    final List<Object> result = new ArrayList<Object>();
    try {
      result.addAll(evaluateAsIterable(arguments, rawValue));
    } catch (TemplateProcessingException ex) {
      result.add(rawValue);
    }
 
    return unmodifiableList(result);
  }
 
  public static List<String> evaluateAsStringsWithDelimiter(ITemplateContext arguments, String rawValue, String delimiter) {
    notNull(arguments, "arguments must not be null");
    notEmpty(rawValue, "rawValue must not be empty");
    notEmpty(delimiter, "delimiter must not be empty");
 
    final List<String> result = new ArrayList<String>();
    final List<Object> iterates = evaluateAsIterableOrRawValue(arguments, rawValue);
 
    for (Object o : iterates) {
      result.addAll(asList(StringUtils.split(o, delimiter)));
    }
 
    return unmodifiableList(result);
  }

以上為后端代碼實(shí)現(xiàn)內(nèi)容，

頁面標(biāo)簽使用方式：