如何实现自定义标签

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创建自定义标签类public class UserInfoTag extends TagSupport {       private UserInfo user;     @Override    public int doStartTag() throws JspException {        try {            JspWriter out = this.pageContext.getOut();            if(user == null) {                out.println('No UserInfo Found...');                return SKIP_BODY;            }            out.println('

');            out.println('');            out.println('');            out.println('');            out.println('');            out.println('');            out.println('');            out.println('');            out.println('');            out.println('');            out.println('');            out.println('');            out.println('');            out.println('

Username:	' + user.getUserName() + '
Age:	' + user.getAge() + '
Email:	' + user.getEmail() + '

');        } catch(Exception e) {            throw new JspException(e.getMessage());        }        return SKIP_BODY;    }       @Override    public int doEndTag() throws JspException {        return EVAL_PAGE;    }     @Override    public void release() {        super.release();        this.user = null;    }       //getter and setters    public UserInfo getUser() {        return user;    }    public void setUser(UserInfo user) {        this.user = user;    }}