jsp中sitemesh修改tagRule技术分享(1/2)

sitemesh默认提供了一些常用的rule

可以看到其实可以选择

/**
 * Extracts the contents of any elements that look like
 * ... and write the contents
 * to a page property (page.foo).
 *
 * 
This is a cheap and cheerful mechanism for embedding multiple components in a
 * page that can be used in different places in decorators.
 *
 * @author Joe Walnes
 */
public class ContentBlockExtractingRule extends BasicBlockRule {
 private final ContentProperty propertyToExport;
 public ContentBlockExtractingRule(ContentProperty propertyToExport) {
  this.propertyToExport = propertyToExport;
 }
 @Override
 protected String processStart(Tag tag) throws IOException {
  tagProcessorContext.pushBuffer();
  return tag.getAttributeValue("tag", false);
 }
 @Override
 protected void processEnd(Tag tag, String tagId) throws IOException {
  propertyToExport.getChild(tagId).setValue(tagProcessorContext.currentBufferContents());
  tagProcessorContext.popBuffer();
 }
}

修改ScriptTagRuleBundle处理如下

public class ScriptTagRuleBundle implements TagRuleBundle {
 @Override
 public void install(State defaultState, ContentProperty contentProperty, SiteMeshContext siteMeshContext) {
  defaultState.addRule("content", new ContentBlockExtractingRule(contentProperty.getChild("page")));
 }
 @Override
 public void cleanUp(State defaultState, ContentProperty contentProperty, SiteMeshContext siteMeshContext) {
 }
}

用法很简单使用content作为tag默认填上tag即可

比如