tohtml.tag

java web开发详解 源码,作者是孙鑫老师

<%@ tag pageEncoding="GB2312" %>
<%@ attribute name="escapeHtml" required="true" type="java.lang.Boolean"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%!
    public String toHtml(String str)
    {
        if(str==null)
            return null;
        StringBuffer sb = new StringBuffer();
        int len = str.length();
        for (int i = 0; i < len; i++)
        {
            char c = str.charAt(i);
            switch(c)
            {                  
            case '\'':
                sb.append("&#39;");
                break;
            case '<':
                sb.append("&lt;");
                break;
            case '>':
                sb.append("&gt;");
                break;
            case '&':
                sb.append("&amp;");
                break;
            case '"':
                sb.append("&#34;");
                break;
            default:
                sb.append(c);
            }
        }
        return sb.toString();
    }   
%>

<c:choose>
    <c:when test="${escapeHtml}">
        <jsp:doBody var="content"/>
        <%
            out.println(toHtml((String)jspContext.getAttribute("content")));
        %>
    </c:when>
    <c:otherwise>
        <jsp:doBody/>
    </c:otherwise>
</c:choose>