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Strut2斷定能否是AJAX挪用
1. AJAX與傳統Form表單
現實上,二者普通都是經由過程HTTP的POST要求。差別是閱讀器提交Form表單後,希冀辦事器前往一個完全的HTML頁面。而AJAX挪用是由XMLHttpRequest對象(分歧閱讀器能夠紛歧樣)收回,閱讀器希冀辦事器前往HTML片斷便可,詳細是JSON、XML等都沒有請求。前往到閱讀器後若何應用,也是由JS劇本本身決議的。
2. 要求是否是AJAX
那末關於辦事器端,若何斷定一個HTTP要求是否是AJAX挪用?這須要看HTTP的Header。
我們可以經由過程Header中的x-request-with來斷定。雖然分歧閱讀器發送AJAX要求的對象分歧,然則假如應用jQuery發送AJAX要求的話,jQuery外部完成ajax的時刻,曾經參加了標識。jQuery源碼中是如許的:xhr.setRequestHeader("X-Requested-With","XMLHttpRequest");
所以,假如項目標前台頁面都是經由過程jQuery發送AJAX要求的話,如許斷定是平安的。
上面是HTTP要求攜帶的Header信息。
通俗Form表單提交
===MimeHeaders === accept = */* referer =http://localhost:8080/user2/toQueryPage.action accept-language = zh-CN user-agent = Mozilla/4.0 (compatible; MSIE8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C;.NET4.0E) accept-encoding = gzip, deflate host = localhost:8080 connection = Keep-Alive cache-control = no-cache
AJAX挪用(IE)
===MimeHeaders === x-requested-with = XMLHttpRequest accept-language = zh-cn referer =http://localhost:8080/user2/toQueryPage.action accept = application/json, text/javascript,*/*; q=0.01 content-type =application/x-www-form-urlencoded accept-encoding = gzip, deflate user-agent = Mozilla/4.0 (compatible; MSIE8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C;.NET4.0E) host = localhost:8080 content-length = 57 connection = Keep-Alive cache-control = no-cache
3. 在Action中取得HTTP要求頭
在Action類中,經由過程ServletRequestAware接口取得HttpServletRequest對象,再經由過程getHeader辦法獲得我們想要的頭信息。
public abstract class BaseAction <ParamVo extends BaseParamVo, ResultVo extends BaseResultVo> extends ActionSupport implements ServletRequestAware { private static final String AJAX_RESULT_NAME = "ajaxResult"; private static final String XHR_OBJECT_NAME = "XMLHttpRequest"; private static final String HEADER_REQUEST_WITH = "x-requested-with"; /** * Request對象,用來斷定要求能否是AJAX挪用 */ private HttpServletRequest request; private ParamVo paramVo; private ResultVo resultVo; @Override public String execute() { String resultPage = SUCCESS; try { resultVo = doExecute(paramVo); } catch (BaseException e) { resultPage = ERROR; } if (XHR_OBJECT_NAME.equals(request.getHeader(HEADER_REQUEST_WITH))) { resultPage = AJAX_RESULT_NAME; } return resultPage; } }
Struts2機能調優攔阻器
當我們在任務中須要完成某些小需求時,無妨先輩行下簡略的調研,看看正在應用的開源框架能否曾經具有了我們須要的功效,如許就不消反復創造輪子了。
上面以機能測試為例,看看若何查詢拜訪Struts2框架能否具有這類功效。
1. struts-default.xml
由於Struts2的很多焦點功效都是基於外部攔阻器來完成的,所以我們起首要看看它能否有機能調優相干的攔阻器。這就須要檢查strut2-core-2.3.1.2.jar中的默許設置裝備擺設文件struts-default.xml了。
<span > </span><interceptor name="alias" class="com.opensymphony.xwork2.interceptor.AliasInterceptor"/> <interceptor name="autowiring" class="com.opensymphony.xwork2.spring.interceptor.ActionAutowiringInterceptor"/> <interceptor name="chain" class="com.opensymphony.xwork2.interceptor.ChainingInterceptor"/> <interceptor name="conversionError" class="org.apache.struts2.interceptor.StrutsConversionErrorInterceptor"/> <interceptor name="cookie" class="org.apache.struts2.interceptor.CookieInterceptor"/> <interceptor name="clearSession" class="org.apache.struts2.interceptor.ClearSessionInterceptor" /> <interceptor name="createSession" class="org.apache.struts2.interceptor.CreateSessionInterceptor" /> <interceptor name="debugging" class="org.apache.struts2.interceptor.debugging.DebuggingInterceptor" /> <interceptor name="execAndWait" class="org.apache.struts2.interceptor.ExecuteAndWaitInterceptor"/> <interceptornameinterceptorname="exception" class="com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor"/> <interceptor name="fileUpload" class="org.apache.struts2.interceptor.FileUploadInterceptor"/> <interceptor name="i18n" class="com.opensymphony.xwork2.interceptor.I18nInterceptor"/> <interceptor name="logger" class="com.opensymphony.xwork2.interceptor.LoggingInterceptor"/> <interceptor name="modelDriven" class="com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor"/> <interceptor name="scopedModelDriven" class="com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor"/> <interceptor name="params" class="com.opensymphony.xwork2.interceptor.ParametersInterceptor"/> <interceptor name="actionMappingParams" class="org.apache.struts2.interceptor.ActionMappingParametersInteceptor"/> <interceptor name="prepare" class="com.opensymphony.xwork2.interceptor.PrepareInterceptor"/> <interceptor name="staticParams" class="com.opensymphony.xwork2.interceptor.StaticParametersInterceptor"/> <interceptor name="scope" class="org.apache.struts2.interceptor.ScopeInterceptor"/> <interceptor name="servletConfig" class="org.apache.struts2.interceptor.ServletConfigInterceptor"/> <interceptor name="timer" class="com.opensymphony.xwork2.interceptor.TimerInterceptor"/> <interceptor name="token" class="org.apache.struts2.interceptor.TokenInterceptor"/> <interceptor name="tokenSession" class="org.apache.struts2.interceptor.TokenSessionStoreInterceptor"/> <interceptor name="validation" class="org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor"/> <interceptor name="workflow" class="com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor"/> <interceptor name="store" class="org.apache.struts2.interceptor.MessageStoreInterceptor" /> <interceptor name="checkbox" class="org.apache.struts2.interceptor.CheckboxInterceptor" /> <interceptor name="profiling" class="org.apache.struts2.interceptor.ProfilingActivationInterceptor" /> <interceptor name="roles" class="org.apache.struts2.interceptor.RolesInterceptor" /> <interceptor name="annotationWorkflow" class="com.opensymphony.xwork2.interceptor.annotations.AnnotationWorkflowInterceptor" /> <interceptor name="multiselect" class="org.apache.struts2.interceptor.MultiselectInterceptor" />
Struts2像個百寶箱一樣內置了許多攔阻器,可以看到profiling極可能就是相符我們需求的攔阻器,那如今就翻開源碼一探討竟。
2. ProfilingActivationInterceptor
org.apache.struts2.interceptor.ProfilingActivationInterceptor.java
public class ProfilingActivationInterceptor extendsAbstractInterceptor { private String profilingKey = "profiling"; private boolean devMode; @Inject(StrutsConstants.STRUTS_DEVMODE) public void setDevMode(String mode) { this.devMode = "true".equals(mode); } @Override public String intercept(ActionInvocationinvocation) throws Exception { if (devMode) { Object val =invocation.getInvocationContext().getParameters().get(profilingKey); if (val != null) { String sval = (val instanceof String ?(String)val : ((String[])val)[0]); boolean enable = "yes".equalsIgnoreCase(sval)|| "true".equalsIgnoreCase(sval); UtilTimerStack.setActive(enable); invocation.getInvocationContext().getParameters().remove(profilingKey); } } return invocation.invoke(); } }
從源碼中可以看到,只需閱讀器發過去的HTTP要求參數中包括profiling=true或許yes,機能攔阻器就會開啟Timer對象類,打印出Action的履行消費時光。
3. struts.xml
由於profiling攔阻器沒有包括到默許的defaultStack中,所以我們要先將它追加到我們自界說的攔阻器棧中。
<package name="ajax-default" extends="velocity-default"> <result-types> <result-type name="json" class="org.apache.struts2.json.JSONResult"/> </result-types> <interceptors> <interceptor-stacknameinterceptor-stackname="ajaxInterceptorStack"> <interceptor-refnameinterceptor-refname="defaultStack" /> <interceptor-ref name="profiling"/> </interceptor-stack> </interceptors> <default-interceptor-refnamedefault-interceptor-refname="ajaxInterceptorStack" /> <global-results> <result name="comAjaxResult" type="json"> <param name="excludeNullProperties">true</param> <param name="root">result</param> <param name="ignoreHierarchy">false</param> </result> </global-results> </package>
4. userview.js
如今便可以修正AJAX挪用參數,追加上profiling參數便可以開端機能調優了。
function searchAllUser(){ jQuery.ajax({ type:"post", url: "searchAllUser.action", processData:true, dataType:'json', data:jQuery("#userQueryForm").serialize() + "&profiling=yes", success:function(data) { if (data.status == 1) { alert("創立勝利"); generateTableFromJson("result", data.resultRows); } else { alert("創立掉敗"); } } }); }
5. 終究後果
打印成果就是上面如許。除總履行時光外,Action辦法的履行時光和Result的襯著時光都邑分離列出。