Jsp自定义标签打包成Jar简单实例（含代码）

package frame.tag; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.BodyTagSupport; public class BodyTag extends BodyTagSupport { private int countNum=0;//循环显示时间的次数 private int currentNum=1;//当前执行次数 public int getCountNum() { return countNum; } public void setCountNum(int countNum) { this.countNum = countNum; this.currentNum = 1 ; } //----标签开始时调用此方法------- @Override public int doStartTag() throws JspException { try{ JspWriter out = pageContext.getOut() ; out.print("<font color=\"red\">标签开始了：</font><br>") ; if(countNum>0) return EVAL_BODY_INCLUDE ; else return SKIP_BODY ; }catch(Exception e){ return SKIP_BODY ; } } //----标签体执行完后调用此方法---- @Override public int doAfterBody() throws JspException { try { JspWriter out = pageContext.getOut() ; out.print("第"+currentNum+"次执行标签体。标签体执行完毕！<br>") ; if(countNum>1){ countNum-- ; currentNum++ ; return EVAL_BODY_BUFFERED ; }else{ return SKIP_BODY ; } } catch (Exception e) { return SKIP_BODY ; } } //----标签结束时调用此方法------- @Override public int doEndTag() throws JspException { try { JspWriter out = pageContext.getOut() ; //bodyContent.writeOut(bodyContent.getEnclosingWriter()) ; //out.print("<br>标签体结束！") ; out.write("<font color=\"red\">标签体循环完毕!标签结束！！！</font>") ; } catch (Exception e) { System.out.println(e); } return EVAL_PAGE ; } }