Converter添加java.util.Date类型转换器
1 编写UtilDateConverter转换器类，
实现Converter接口的convert方法(com.sun.org.apache.commons.beanutils.Converter)
public class UtilDateConverter implements Converter {
 public Object convert(Class type, Object value) {
  System.out.println("UtilDateConverter.value="+value);
  if(value==null){
   return value;
  }
  if(value instanceof Date){//instanceof判断是否属于此类型
   return value;
  }
  Date d=null;
  if(value instanceof String){

   SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
   try {
    d=sdf.parse(value.toString());
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
  return d;
 }
}
2 利用servlet的init()方法注册转换器到ConvertUtils(com.sun.org.apache.commons.beanutils.ConvertUtils)
public class UtilDateConverterInitServlet extends HttpServlet {
 public void init() throws ServletException {
  System.out.println("UtilDateConverterInitServlet.init()");
  ConvertUtils.register(new UtilDateConverter(),Date.class);
 }
}
3 配置servlet,并设</load-on-startup>值
 <servlet>
    <servlet-name>UtilDateConverterInitServlet</servlet-name>
    <servlet-class>com.bjsxt.servlet.UtilDateConverterInitServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>UtilDateConverterInitServlet</servlet-name>
    <url-pattern>/servlet/UtilDateConverterInitServlet</url-pattern>
  </servlet-mapping>
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方法二：
1 编写UtilDateConverter转换器类，
实现Converter接口的convert方法(com.sun.org.apache.commons.beanutils.Converter)
（同上）
2 编写UtilDateConverterInitWithPlugIn类实现PlugIn接口的init()方法
public class UtilDateConverterInitWithPlugIn implements PlugIn {
 public void destroy() {
 }
 public void init(ActionServlet arg0, ModuleConfig arg1)
   throws ServletException {
  System.out.println("UtilDateConverterInitServlet.init()");
  ConvertUtils.register(new UtilDateConverter(),Date.class);
 }
}
3 在struts-config.xml文件中配置<plug-in>标签
<plug-in className="com.bjsxt.servlet.UtilDateConverterInitWithPlugIn"/>