jsp页面中处理Clob类型的数据

jsp页面中处理Clob类型的数据,想了想,还是用标签解决:

 

在web.xml中配置:

 <jsp-config>
    <taglib>
	<taglib-uri>
	/myStringUtils-taglib
	<taglib-uri>
	<taglib-location>/WEB-INF/myStringUtils-taglib.tld</taglib-location>
  </taglib>
    </jsp-config>

 在dtd中:

<?xml version="1.0" encoding="UTF-8" ?>

<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
	version="2.0">


	<tlib-version>1.0</tlib-version>
	<short-name>myStringUtils-taglib</short-name>
	<uri>/myStringUtils-taglib</uri>

	<function>
		<description>convert Clob to String</description>
		<name>convertClob</name>
		<function-class>cn.org.gddr.web.utils.StringTag</function-class>
		<function-signature>
			String convertClob(java.lang.Object)
		</function-signature>

	</function>
</taglib>

 

 

Stringtag.java

public class StringTag {

	public static String convertClob(Object clob) throws Exception {
		if (clob == null) {
			return "";
		}
		StringBuffer clobString = new StringBuffer();
		if (clob instanceof Clob) {
			int y;
			char ac[] = new char[4096];
			Reader reader = ((Clob) clob).getCharacterStream();
			while ((y = reader.read(ac, 0, 4096)) != -1) {
				clobString.append(new String(ac, 0, y));
			}
		} else {
			clobString.append(clob.toString());
		}
		return clobString.toString();
	}
	
}