DataSource ds = (DataSource)getServletContext().getAttribute("")找不到getServlet
我在测试监听器，结果DataSource ds = (DataSource)getServletContext().getAttribute("dataSource");这里面getServletContext()下面有红线，提示错误，请问该怎么解决？
这个测试类完整代码是：

package listener;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

public class TestLintener {
  public void test (HttpServletRequest request,HttpServletResponse response)
  {
  response.setContentType("text/html;charSet=UTF-8");
  response.setCharacterEncoding("UTF-8");
  try {
  request.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
DataSource ds = (DataSource)getServletContext().getAttribute("dataSource");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
  }
}

------解决方案--------------------
public class TestLintener这行是不是少了点什么？