后台系统中应该须要一个功能那就是将每一个请求的url地址和请求的參数log出来，方便系统调试和bug追踪，使用struts2时能够使用struts2的全局拦截器实现此功能：

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;

import org.apache.log4j.Logger;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

/**

 * 全局方法拦截器，用于log方法调用以及參数信息

 */

public class GloableLogInterceptor extends AbstractInterceptor {

	private static final long serialVersionUID = 1L;

	private Logger log = Logger.getLogger(this.getClass());

	@Override

	public String intercept(ActionInvocation invocation) throws Exception {

		if (log.isDebugEnabled()) {

			HttpServletRequest request = (HttpServletRequest) invocation

					.getInvocationContext().get(

							ServletActionContext.HTTP_REQUEST);

			this.logParameters(request);

		}

		return invocation.invoke();

	}

	/**

	 *

	 * @param request

	 */

	private void logParameters(HttpServletRequest request) {

		Map<String, String[]> params = request.getParameterMap();

		if (null == params || params.size() == 0) {

			return;

		}

		Set<String> keys = params.keySet();

		Iterator<String> keysIt = keys.iterator();

		StringBuffer container = new StringBuffer();

		container.append("requestUrl[url:")

				.append(request.getRequestURL().toString()).append("]")

				.append(",paremeters:[");

		while (keysIt.hasNext()) {

			String key = keysIt.next();

			String[] values = params.get(key);

			StringBuffer str = new StringBuffer();

			str.append(key).append("=");

			if (values.length > 1) {

				str.append("{");

				for (String value : values) {

					str.append(value).append(",");

				}

				this.removeLastCharacter(str);

				str.append("}");

			} else

				str.append(values[0]);

			str.append(",");

			container.append(str.toString());

		}

		this.removeLastCharacter(container);

		container.append("]");

		log.debug(container.toString());

	}

	private void removeLastCharacter(StringBuffer buff) {

		int len = buff.length();

		buff.replace(len - 1, len, StringUtils.EMPTY);

	}

}

这时我们还须要自己定义拦截器链，这样就不须要在每一个package中声明使用此拦截器。仅仅要将须要的package继承我们带有日志拦截功能的拦截器就可以！

		<interceptors>

			<!--全局日志拦截器-->

			<interceptor name="gloableLogInterceptor" class="gloableLogInterceptor"></interceptor>

			<interceptor-stack name="defaultStack">

				<interceptor-ref name="exception" />

				<interceptor-ref name="alias" />

				<interceptor-ref name="servletConfig" />

				<interceptor-ref name="i18n" />

				<interceptor-ref name="prepare" />

				<interceptor-ref name="chain" />

				<interceptor-ref name="scopedModelDriven" />

				<interceptor-ref name="modelDriven" />

				<interceptor-ref name="fileUpload" />

				<interceptor-ref name="checkbox" />

				<interceptor-ref name="multiselect" />

				<interceptor-ref name="staticParams" />

				<interceptor-ref name="actionMappingParams" />

				<interceptor-ref name="params">

					<param name="excludeParams">^action:.*,^method:.*</param>

				</interceptor-ref>

				<!-- 在注入參数后进行拦截 -->

				<interceptor-ref name="gloableLogInterceptor"></interceptor-ref>

				<interceptor-ref name="tokenInterceptor"></interceptor-ref>

				<interceptor-ref name="conversionError" />

				<interceptor-ref name="validation">

					<param name="excludeMethods">input,back,cancel,browse</param>

				</interceptor-ref>

				<interceptor-ref name="workflow">

					<param name="excludeMethods">input,back,cancel,browse</param>

				</interceptor-ref>

				<interceptor-ref name="debugging" />

				<interceptor-ref name="deprecation" />

			</interceptor-stack>

		</interceptors>

		<default-interceptor-ref name="defaultStack"></default-interceptor-ref>

	</package>