项目背景:springboot+thymeleaf
thymeleaf两种方式处理自定义标签:AbstractAttributeTagProcessor 和 AbstractElementTagProcessor
一、AbstractAttributeTagProcessor :
1. 定义dialog
package com.spt.im.web.config;
import java.util.HashSet;
import java.util.Set;
import org.springframework.beans.factory.annotation.Value;
import org.thymeleaf.dialect.AbstractProcessorDialect;
import org.thymeleaf.processor.IProcessor;
public class CustomDialect extends AbstractProcessorDialect{
private static final String DIALECT_NAME = "staticFile";
private static final String PREFIX = "W";
public static final int PROCESSOR_PRECEDENCE = 1000;
@Value("${im.static.resources}")
private String filePath;
protected CustomDialect() {
super(DIALECT_NAME, PREFIX, PROCESSOR_PRECEDENCE);
}
@Override
public Set<IProcessor> getProcessors(String dialectPrefix) {
final Set<IProcessor> processors = new HashSet<IProcessor>();
processors.add(new SampleJsTagProcessor(dialectPrefix, filePath));
processors.add(new SampleCssTagProcessor(dialectPrefix, filePath));
processors.add(new SampleSrcTagProcessor(dialectPrefix, filePath));
return processors;
}
}
2. 定义处理器
package com.spt.im.web.config;
import org.thymeleaf.IEngineConfiguration;
import org.thymeleaf.context.ITemplateContext;
import org.thymeleaf.engine.AttributeName;
import org.thymeleaf.model.IProcessableElementTag;
import org.thymeleaf.processor.element.AbstractAttributeTagProcessor;
import org.thymeleaf.processor.element.IElementTagStructureHandler;
import org.thymeleaf.standard.expression.IStandardExpression;
import org.thymeleaf.standard.expression.IStandardExpressionParser;
import org.thymeleaf.standard.expression.StandardExpressions;
import org.thymeleaf.templatemode.TemplateMode;
public class SampleJsTagProcessor extends AbstractAttributeTagProcessor{
private static final String ATTR_NAME = "js";
private static final String ELE_NAME = "script";
private static final int PRECEDENCE = 10000;
private String filePath;
protected SampleJsTagProcessor(String dialectPrefix, String filePath) {
super(
TemplateMode.HTML,
dialectPrefix,
ELE_NAME,
false,
ATTR_NAME,
true,
PRECEDENCE,
true);
this.filePath = filePath;
}
@Override
protected void doProcess(ITemplateContext context,
IProcessableElementTag tag, AttributeName attributeName,
String attributeValue, IElementTagStructureHandler structureHandler) {
final IEngineConfiguration configuration = context.getConfiguration();
final IStandardExpressionParser parser = StandardExpressions.getExpressionParser(configuration);
final IStandardExpression expression = parser.parseExpression(context, attributeValue);
final String url = (String) expression.execute(context);
structureHandler.setAttribute("src", filePath + url);
}
}
3. 添加到配置中
package com.spt.im.web.config;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class WorkImport {
@Bean
public CustomDialect testDialect(){
return new CustomDialect();
}
}
4. 页面中使用
<script W:js="@{/static/js/pinyin.js}" type="text/javascript"></script>
项目运行,上述标签会被替换成相应的链接。
