我的足迹8(javajqueryajaxjs).doc

java中?获取Ser?vletC?ontex?t常见方法? 1.在java?x.servl?et.Filte?r中直接获?取 Servl?etCon?text conte?xt = confi?g.getSe?rvlet?Conte?xt(); 2.在Http?Servl?et中直接?获取 this.getSe?rvlet?Conte?xt() 3.在其他方法?中，通过Htt?pRequ?est获得? reque?st.getSe?ssion?().getSe?rvlet?Conte?xt(); ? 4.在stru?ts2中还?有常见的两?种方法获得? 获取Htt?pServ?letRe?quest? / HttpS?essio?n / Servl?etCon?text / HttpS?ervle?tResp?onse对?象 方法一，通过Ser?vletA?ction?Conte?xt.类直接获取?： HttpS?ervle?tRequ?est reque?st = Servl?etAct?ionCo?ntext?.getRe?quest?(); reque?st.getSe?ssion?(); Servl?etCon?text servl?etCon?text = Servl?etAct?ionCo?ntext?.getSe?rvlet?Conte?xt(); HttpS?ervle?tResp?onse respo?nse = Servl?etAct?ionCo?ntext?.getRe?spons?e(); 方法二，实现指定接?口，由stru?ts框架运?行时注入： publi?c class? Hello?World?Actio?n imple?ments? Servl?etReq?uestA?ware, Servl?etRes?ponse?Aware?, Servl?etCon?textA?ware{ priva?te HttpS?ervle?tRequ?est reque?st; priva?te Servl?etCon?text servl?etCon?text; priva?te HttpS?ervle?tResp?onse respo?nse; publi?c void setSe?rvlet?Reque?st(HttpS?ervle?tRequ?est req) { this.reque?st=req; } publi?c void setSe?rvlet?Respo?nse(HttpS?ervle?tResp?onse res) { this.respo?nse=res; } publi?c void setSe?rvlet?Conte?xt(Servl?etCon?text ser) { this.servl?etCon?text=ser; } } Ajax请?求中的as?ync:false?/true的?作用 官方的解释?是： async? Boole?an Defau?lt: true? By defau?lt, all reque?sts are sent async?hrono?us (e.g. this is set to true by defau?lt). If you need synch?ronou?s reque?sts, set this optio?n to false?. Note that synch?ronou?s reque?sts may tempo?raril?y lock the brows?er, disab?ling any actio?ns while? the reque?st is activ?e. async?. 默认是tr?ue，即为异步方?式，$.Ajax执?行后，会继续执行?ajax后?面的脚本，直到服务器?端返回数据?后，触发$.Ajax里?的succ?ess方法?， 这时候执行?的是两个线?程。若要将其设?置为fal?se，则所有的请?求均为同步?请求，在没有返回?值之前，同步请求将?锁住浏览器?，用户其它操?作必须等待?请求完成 才可以执行?。 下面查看一?个示例： 01 var temp; 02 $.ajax({ 03 ???async?: false?, 04 ???type : POST, 05 ???url : defau?ltPos?tData?.url, 06 ???dataT?ype : json, 07 ???succe?ss : funct?ion(data) { 08 ??????temp=data; 09 ???} 10 }); 11 alert?(temp); 这个aja?x