struts2 全局拦截器，显示请求方法和参数

后台系统中应该需要一个功能那就是将每个请求的url地址和请求的参数log出来，方便系统调试和bug追踪，使用struts2时可以使用struts2的全局拦截器实现此功能：

 

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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方法调用以及参数信息  */ 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);     } } </string></string></string,>

这时我们还需要自定义拦截器链，这样就不需要在每个package中声明使用此拦截器，只要将需要的package继承我们带有日志拦截功能的拦截器即可！

 

 

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<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:.*         </interceptor-ref>         <!-- 在注入参数后进行拦截 -->         <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         </interceptor-ref>         <interceptor-ref name="workflow">             <param name="excludeMethods">input,back,cancel,browse         </interceptor-ref>         <interceptor-ref name="debugging">         <interceptor-ref name="deprecation">     </interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-ref></interceptor-stack> </interceptors>   <default-interceptor-ref name="defaultStack"></default-interceptor-ref>