您可以将各种属性与自定义标签一起使用。要接受属性值，自定义标记类需要实现setter方法，与JavaBean setter方法相同，如下所示-
package com.nhooo;
import javax.servlet.jsp.tagext.*;
import javax.servlet.jsp.*;
import java.io.*;
public class HelloTag extends SimpleTagSupport {
private String message;
public void setMessage(String msg) {
this.message = msg;
}
StringWriter sw = new StringWriter();
public void doTag() throws JspException, IOException {
if (message != null) {
/* Use message from attribute */
JspWriter out = getJspContext().getOut();
out.println( message );
} else {
/* use message from the body */
getJspBody().invoke(sw);
getJspContext().getOut().println(sw.toString());
}
}
}该属性的名称为“ message”，因此setter方法为setMessage()。现在让我们使用<attribute>元素将此属性添加到TLD文件中，如下所示-
<taglib> <tlib-version>1.0</tlib-version> <jsp-version>2.0</jsp-version> <short-name>Example TLD with Body</short-name> <tag> <name>Hello</name> <tag-class>com.nhooo.HelloTag</tag-class> <body-content>scriptless</body-content> <attribute> <name>message</name> </attribute> </tag> </taglib>
让我们遵循JSP的message属性，如下所示：
<%@ taglib prefix = "ex" uri = "WEB-INF/custom.tld"%> <html> <head> <title>A sample custom tag</title> </head> <body> <ex:Hello message = "This is custom tag" /> </body> </html>
这将产生以下结果-
This is custom tag