第五章 頁面優化技術
1.頁面緩存
我們在優化之前,接口返回的大多是頁面名稱,或響應數據,在這裏我們對頁面進行緩存處理,接口將返回靜態頁面的代碼。
步驟:1 取緩存;2 手動渲染模板;3 輸出結果
經過取緩存、手動渲染模板、輸出結果三個步驟完善商品列表頁、商品詳細。
1.1頁面緩存(商品列表頁面)
@RequestMapping(value="/to_list", produces="text/html")
@ResponseBody
public String list(Model model, MiaoshaUser user, HttpServletRequest request, HttpServletResponse response){
// System.out.println(user);
model.addAttribute("user",user);
//取緩存
String html = redisService.get(GoodsKey.getGoodsList, "", String.class);
if(!StringUtils.isEmpty(html)) {
return html;
}
//取數據庫
List<GoodsVo> goodsList = goodsService.listGoodsVo();
model.addAttribute("goodsList",goodsList);
//return "goods_list";
//手動渲染
//https://blog.csdn.net/ouzhuangzhuang/article/details/84839266
IWebContext ctx =new WebContext(request,response, request.getServletContext(),request.getLocale(),model.asMap());
html = thymeleafViewResolver.getTemplateEngine().process("goods_list", ctx);
if(!StringUtils.isEmpty(html)) {
redisService.set(GoodsKey.getGoodsList, "", html);
}
return html;
}
public class GoodsKey extends BasePrefix{
private GoodsKey(int expireSeconds, String prefix) {
super(expireSeconds, prefix);
}
public static GoodsKey getGoodsList = new GoodsKey(60, "gl");
public static GoodsKey getGoodsDetail = new GoodsKey(60, "gd");
}
1.2 URL緩存(商品詳情)
@RequestMapping(value="/to_detail2/{goodsId}",produces="text/html")
@ResponseBody
public String detai2(HttpServletRequest request, HttpServletResponse response, Model model, MiaoshaUser user,
@PathVariable("goodsId")long goodsId){
model.addAttribute("user",user);
//取緩存
String html = redisService.get(GoodsKey.getGoodsDetail, ""+goodsId, String.class);
if(!StringUtils.isEmpty(html)) {
return html;
}
//手動渲染
GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);
//System.out.println(goods.toString());
model.addAttribute("goods",goods);
//
long startAt = goods.getStartDate().getTime();
long endAt = goods.getEndDate().getTime();
long now = System.currentTimeMillis();
int miaoshaStatus = 0;
int remainSeconds = 0;
if(now < startAt ) {//秒殺還沒開始,倒計時
miaoshaStatus = 0;
remainSeconds = (int)((startAt - now )/1000);
}else if(now > endAt){//秒殺已經結束
miaoshaStatus = 2;
remainSeconds = -1;
}else {//秒殺進行中
miaoshaStatus = 1;
remainSeconds = 0;
}
//秒殺狀態
model.addAttribute("miaoshaStatus", miaoshaStatus);
//秒殺倒計時
model.addAttribute("remainSeconds", remainSeconds);
//return "goods_detail";
//手動渲染
IWebContext ctx =new WebContext(request,response,
request.getServletContext(),request.getLocale(),model.asMap());
html = thymeleafViewResolver.getTemplateEngine().process("goods_detail", ctx);
if(!StringUtils.isEmpty(html)) {
redisService.set(GoodsKey.getGoodsDetail, ""+goodsId, html);
}
return html;
}
1.3 對象緩存
使用對象緩存重寫MaioshaService裏面的getById方法,使得不直接訪問數據庫,同時也要重寫updatePassword方法。
public MiaoshaUser getById(long id){
//取緩存
MiaoshaUser user = redisService.get(MiaoshaUserKey.getById, ""+id, MiaoshaUser.class);
if(user != null) {
return user;
}
//取數據庫
user = miaoshaUserDao.getById(id);
//加緩存
if(user != null) {
redisService.set(MiaoshaUserKey.getById, ""+id, user);
}
return user;
}
public boolean updatePassword(String token, long id, String formPass) {
//取user
MiaoshaUser user = getById(id);
if(user == null) {
throw new GlobalException(CodeMsg.MOBILE_NOT_EXIST);
}
//更新數據庫
MiaoshaUser toBeUpdate = new MiaoshaUser();
toBeUpdate.setId(id);
toBeUpdate.setPassword(MD5Util.formPassToDBPass(formPass, user.getSalt()));
miaoshaUserDao.update(toBeUpdate);
//處理緩存
redisService.delete(MiaoshaUserKey.getById, ""+id);
user.setPassword(toBeUpdate.getPassword());
redisService.set(MiaoshaUserKey.token, token, user);
return true;
}
2.頁面靜態化
2.1前後端分離
頁面優化使用前後端分離,具體的在該項目中在商品列表跳轉到商品詳情可以體現,在靜態頁面初始化的時候,調用後端接口,獲取商品詳情,實現頁面靜態化
@RequestMapping(value="/detail/{goodsId}")
@ResponseBody
public Result<GoodsDetailVo> detail(HttpServletRequest request, HttpServletResponse response, Model model, MiaoshaUser user,
@PathVariable("goodsId")long goodsId) {
GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);
long startAt = goods.getStartDate().getTime();
long endAt = goods.getEndDate().getTime();
long now = System.currentTimeMillis();
int miaoshaStatus = 0;
int remainSeconds = 0;
if(now < startAt ) {//秒殺還沒開始,倒計時
miaoshaStatus = 0;
remainSeconds = (int)((startAt - now )/1000);
}else if(now > endAt){//秒殺已經結束
miaoshaStatus = 2;
remainSeconds = -1;
}else {//秒殺進行中
miaoshaStatus = 1;
remainSeconds = 0;
}
GoodsDetailVo vo = new GoodsDetailVo();
vo.setGoods(goods);
vo.setUser(user);
vo.setRemainSeconds(remainSeconds);
vo.setMiaoshaStatus(miaoshaStatus);
return Result.success(vo);
}
//列表頁
<td><a th:href="'/goods_detail.htm?goodsId='+${goods.id}">詳情</a></td>
//goods_detail.htm
<!DOCTYPE HTML>
<html >
<head>
<title>商品詳情</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<!-- jquery -->
<script type="text/javascript" src="/js/jquery.min.js"></script>
<!-- bootstrap -->
<link rel="stylesheet" type="text/css" href="/bootstrap/css/bootstrap.min.css" />
<script type="text/javascript" src="/bootstrap/js/bootstrap.min.js"></script>
<!-- jquery-validator -->
<script type="text/javascript" src="/jquery-validation/jquery.validate.min.js"></script>
<script type="text/javascript" src="/jquery-validation/localization/messages_zh.min.js"></script>
<!-- layer -->
<script type="text/javascript" src="/layer/layer.js"></script>
<!-- md5.js -->
<script type="text/javascript" src="/js/md5.min.js"></script>
<!-- common.js -->
<script type="text/javascript" src="/js/common.js"></script>
<style type="text/css">
html,body{
height:100%;
width:100%;
}
body{
background:url('/img/bg2.jpg') no-repeat;
background-size:100% 100%;
}
#goodslist td{
border-top:1px solid #39503f61;
}
</style>
</head>
<body>
<div class="panel panel-default" style="height:100%;background-color:rgba(222,222,222,0.8)" >
<div class="panel-heading">秒殺商品詳情</div>
<div class="panel-body">
<span id="userTip"> 您還沒有登錄,請登陸後再操作<br/></span>
<span>沒有收貨地址的提示。。。</span>
</div>
<table class="table" id="goodslist">
<tr>
<td>商品名稱</td>
<td colspan="3" id="goodsName"></td>
</tr>
<tr>
<td>商品圖片</td>
<td colspan="3"><img id="goodsImg" width="200" height="200" /></td>
</tr>
<tr>
<td>秒殺開始時間</td>
<td id="startTime"></td>
<td >
<input type="hidden" id="remainSeconds" />
<span id="miaoshaTip"></span>
</td>
<td>
<button class="btn btn-primary" type="button" id="buyButton" onclick="doMiaosha()">立即秒殺</button>
<input type="hidden" name="goodsId" id="goodsId" />
</td>
</tr>
<tr>
<td>商品原價</td>
<td colspan="3" id="goodsPrice"></td>
</tr>
<tr>
<td>秒殺價</td>
<td colspan="3" id="miaoshaPrice"></td>
</tr>
<tr>
<td>庫存數量</td>
<td colspan="3" id="stockCount"></td>
</tr>
</table>
</div>
</body>
<script>
function doMiaosha(){
$.ajax({
url:"/miaosha/do_miaosha",
type:"POST",
data:{
goodsId:$("#goodsId").val(),
},
success:function(data){
if(data.code == 0){
window.location.href="/order_detail.htm?orderId="+data.data.id;
}else{
layer.msg(data.msg);
}
},
error:function(){
layer.msg("客戶端請求有誤");
}
});
}
function render(detail){
var miaoshaStatus = detail.miaoshaStatus;
var remainSeconds = detail.remainSeconds;
var goods = detail.goods;
var user = detail.user;
if(user){
$("#userTip").hide();
}
$("#goodsName").text(goods.goodsName);
$("#goodsImg").attr("src", goods.goodsImg);
$("#startTime").text(new Date(goods.startDate).format("yyyy-MM-dd hh:mm:ss"));
$("#remainSeconds").val(remainSeconds);
$("#goodsId").val(goods.id);
$("#goodsPrice").text(goods.goodsPrice);
$("#miaoshaPrice").text(goods.miaoshaPrice);
$("#stockCount").text(goods.stockCount);
countDown();
}
$(function(){
//countDown();
getDetail();
});
function getDetail(){
var goodsId = g_getQueryString("goodsId");
$.ajax({
url:"/goods/detail/"+goodsId,
type:"GET",
success:function(data){
if(data.code == 0){
render(data.data);
}else{
layer.msg(data.msg);
}
},
error:function(){
layer.msg("客戶端請求有誤");
}
});
}
function countDown(){
var remainSeconds = $("#remainSeconds").val();
var timeout;
if(remainSeconds > 0){//秒殺還沒開始,倒計時
$("#buyButton").attr("disabled", true);
$("#miaoshaTip").html("秒殺倒計時:"+remainSeconds+"秒");
timeout = setTimeout(function(){
$("#countDown").text(remainSeconds - 1);
$("#remainSeconds").val(remainSeconds - 1);
countDown();
},1000);
}else if(remainSeconds == 0){//秒殺進行中
$("#buyButton").attr("disabled", false);
if(timeout){
clearTimeout(timeout);
}
$("#miaoshaTip").html("秒殺進行中");
$("#verifyCodeImg").attr("src", "/miaosha/verifyCode?goodsId="+$("#goodsId").val());
$("#verifyCodeImg").show();
$("#verifyCode").show();
}else{//秒殺已經結束
$("#buyButton").attr("disabled", true);
$("#miaoshaTip").html("秒殺已經結束");
$("#verifyCodeImg").hide();
$("#verifyCode").hide();
}
}
function refreshVerifyCode(){
$("#verifyCodeImg").attr("src", "/miaosha/verifyCode?goodsId="+$("#goodsId").val()+"×tamp="+new Date().getTime());
}
</script>
</html>
2.2瀏覽器緩存
添加配置
#static
#啓用靜態資源處理
spring.resources.add-mappings=true
#客戶端緩存時間
spring.resources.cache.period=3600
spring.resources.chain.cache=true
spring.resources.chain.enabled=true
#啓用html5的application-cache
spring.resources.chain.html-application-cache=true
spring.resources.static-locations=classpath:/static/
3.靜態資源優化
下面我們來了一下靜態資源優化常用的手段
1 JS/CSS壓縮,減少流量
2 多個JS/CSS組合,減少連接數
3 CDN就近訪問
工具有
Tengine:http://tengine.taobao.org/
webback
CDN
綜述
優化完成後,我們可以再次用JMeter進行性能測試,看看QPS是否變大了