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：

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);
}
}

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！

<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</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>