第一個示例：
簡單的jsp自定標簽獲取內容：
首先創建一個jsp實例類然后繼承SimpleTagSupport類
然后實現父類的doTag()方法
在這個方法里獲取標簽體里的內容this.getJspBody();
返回的是JspFragment 類，根據這個類對象調用invoke(this.getJspContext().getOut());
這個方法里面也可以寫空，所表達的意思也是輸出到瀏覽器；

復制代碼 代碼如下:

public class SimpleDmeo1 extends SimpleTagSupport {
@Override
public void doTag() throws JspException, IOException {
JspFragment js =this.getJspBody();
js.invoke(null);
}
}

復制代碼 代碼如下:

public class SimpleDmeo1 extends SimpleTagSupport {
private int counts;
public void setCounts(int counts) {
this.counts = counts;
}
@Override
public void doTag() throws JspException, IOException {
JspFragment js =this.getJspBody();
for(int i=0;i<counts;i++){ //循環獲取
js.invoke(null);
}
}

}
<description>A tag library exercising SimpleTag handlers.</description>
<tlib-version>1.0</tlib-version>
<short-name>c</short-name>前綴名
<uri></uri>
<tag>
<name>demo</name>
<tag-class>com.csdn.simple.SimpleDmeo1</tag-class>
<body-content>scriptless</body-content>
<attribute>
<name>counts</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>

復制代碼 代碼如下:

<hbsi:demo counts="3">aaaaaaa<br/></hbsi:demo> //輸出三編
JspFragment js = this.getJspBody();
StringWriter jw = new StringWriter();
js.invoke(jw);
String s = jw.toString().toUpperCase();
JspWriter out =this.getJspContext().getOut();
for(int i=0;i<counts2;i++){
out.print(s);
}
}