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2015-11-25 09:20 411 查看

<fix:htmlFilter>

<a href="a 发 a a">超链接的写法</a>

</fix:htmlFilter>

package cn.itcast.web.tag.example;

import java.io.IOException;

import java.io.StringWriter;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.JspFragment;

import javax.servlet.jsp.tagext.SimpleTagSupport;

public class HtmlFilter extends SimpleTagSupport {

@Override

public void doTag() throws JspException, IOException {

JspFragment jf=this.getJspBody();

StringWriter sw=new StringWriter();

jf.invoke(sw);

String content=sw.getBuffer().toString();

content=filter(content);

this.getJspContext().getOut().write(content);

}

/*C:\\Tomcat 7.0\\webapps\\examples\\WEB-INF\\classes\\util\\HTMLFilter.java*/

public static String filter(String message) {

if (message == null)

return (null);

char content[] = new char[message.length()];

message.getChars(0, message.length(), content, 0);

StringBuilder result = new StringBuilder(content.length + 50);

for (int i = 0; i < content.length; i++) {

switch (content[i]) {

case '<':

result.append("<");

break;

case '>':

result.append(">");

break;

case '&':

result.append("&");

break;

case '"':

result.append(""");

break;

default:

result.append(content[i]);

}

}

return (result.toString());

}

}

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