第五章 页面优化技术
1.页面缓存
我们在优化之前,接口返回的大多是页面名称,或响应数据,在这里我们对页面进行缓存处理,接口将返回静态页面的代码。
步骤:1 取缓存;2 手动渲染模板;3 输出结果
经过取缓存、手动渲染模板、输出结果三个步骤完善商品列表页、商品详细。
1.1页面缓存(商品列表页面)
@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);
//取缓存
String html = redisService.get(GoodsKey.getGoodsList, "", String.class);
if(!StringUtils.isEmpty(html)) {
return html;
}
//取数据库
List<GoodsVo> goodsList = goodsService.listGoodsVo();
model.addAttribute("goodsList",goodsList);
//return "goods_list";
//手动渲染
//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缓存(商品详情)
@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);
//取缓存
String html = redisService.get(GoodsKey.getGoodsDetail, ""+goodsId, String.class);
if(!StringUtils.isEmpty(html)) {
return html;
}
//手动渲染
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 ) {//秒杀还没开始,倒计时
miaoshaStatus = 0;
remainSeconds = (int)((startAt - now )/1000);
}else if(now > endAt){//秒杀已经结束
miaoshaStatus = 2;
remainSeconds = -1;
}else {//秒杀进行中
miaoshaStatus = 1;
remainSeconds = 0;
}
//秒杀状态
model.addAttribute("miaoshaStatus", miaoshaStatus);
//秒杀倒计时
model.addAttribute("remainSeconds", remainSeconds);
//return "goods_detail";
//手动渲染
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 对象缓存
使用对象缓存重写MaioshaService里面的getById方法,使得不直接访问数据库,同时也要重写updatePassword方法。
public MiaoshaUser getById(long id){
//取缓存
MiaoshaUser user = redisService.get(MiaoshaUserKey.getById, ""+id, MiaoshaUser.class);
if(user != null) {
return user;
}
//取数据库
user = miaoshaUserDao.getById(id);
//加缓存
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);
}
//更新数据库
MiaoshaUser toBeUpdate = new MiaoshaUser();
toBeUpdate.setId(id);
toBeUpdate.setPassword(MD5Util.formPassToDBPass(formPass, user.getSalt()));
miaoshaUserDao.update(toBeUpdate);
//处理缓存
redisService.delete(MiaoshaUserKey.getById, ""+id);
user.setPassword(toBeUpdate.getPassword());
redisService.set(MiaoshaUserKey.token, token, user);
return true;
}
2.页面静态化
2.1前后端分离
页面优化使用前后端分离,具体的在该项目中在商品列表跳转到商品详情可以体现,在静态页面初始化的时候,调用后端接口,获取商品详情,实现页面静态化
@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 ) {//秒杀还没开始,倒计时
miaoshaStatus = 0;
remainSeconds = (int)((startAt - now )/1000);
}else if(now > endAt){//秒杀已经结束
miaoshaStatus = 2;
remainSeconds = -1;
}else {//秒杀进行中
miaoshaStatus = 1;
remainSeconds = 0;
}
GoodsDetailVo vo = new GoodsDetailVo();
vo.setGoods(goods);
vo.setUser(user);
vo.setRemainSeconds(remainSeconds);
vo.setMiaoshaStatus(miaoshaStatus);
return Result.success(vo);
}
//列表页
<td><a th:href="'/goods_detail.htm?goodsId='+${goods.id}">详情</a></td>
//goods_detail.htm
<!DOCTYPE HTML>
<html >
<head>
<title>商品详情</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">秒杀商品详情</div>
<div class="panel-body">
<span id="userTip"> 您还没有登录,请登陆后再操作<br/></span>
<span>没有收货地址的提示。。。</span>
</div>
<table class="table" id="goodslist">
<tr>
<td>商品名称</td>
<td colspan="3" id="goodsName"></td>
</tr>
<tr>
<td>商品图片</td>
<td colspan="3"><img id="goodsImg" width="200" height="200" /></td>
</tr>
<tr>
<td>秒杀开始时间</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()">立即秒杀</button>
<input type="hidden" name="goodsId" id="goodsId" />
</td>
</tr>
<tr>
<td>商品原价</td>
<td colspan="3" id="goodsPrice"></td>
</tr>
<tr>
<td>秒杀价</td>
<td colspan="3" id="miaoshaPrice"></td>
</tr>
<tr>
<td>库存数量</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("客户端请求有误");
}
});
}
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("客户端请求有误");
}
});
}
function countDown(){
var remainSeconds = $("#remainSeconds").val();
var timeout;
if(remainSeconds > 0){//秒杀还没开始,倒计时
$("#buyButton").attr("disabled", true);
$("#miaoshaTip").html("秒杀倒计时:"+remainSeconds+"秒");
timeout = setTimeout(function(){
$("#countDown").text(remainSeconds - 1);
$("#remainSeconds").val(remainSeconds - 1);
countDown();
},1000);
}else if(remainSeconds == 0){//秒杀进行中
$("#buyButton").attr("disabled", false);
if(timeout){
clearTimeout(timeout);
}
$("#miaoshaTip").html("秒杀进行中");
$("#verifyCodeImg").attr("src", "/miaosha/verifyCode?goodsId="+$("#goodsId").val());
$("#verifyCodeImg").show();
$("#verifyCode").show();
}else{//秒杀已经结束
$("#buyButton").attr("disabled", true);
$("#miaoshaTip").html("秒杀已经结束");
$("#verifyCodeImg").hide();
$("#verifyCode").hide();
}
}
function refreshVerifyCode(){
$("#verifyCodeImg").attr("src", "/miaosha/verifyCode?goodsId="+$("#goodsId").val()+"×tamp="+new Date().getTime());
}
</script>
</html>
2.2浏览器缓存
添加配置
#static
#启用静态资源处理
spring.resources.add-mappings=true
#客户端缓存时间
spring.resources.cache.period=3600
spring.resources.chain.cache=true
spring.resources.chain.enabled=true
#启用html5的application-cache
spring.resources.chain.html-application-cache=true
spring.resources.static-locations=classpath:/static/
3.静态资源优化
下面我们来了一下静态资源优化常用的手段
1 JS/CSS压缩,减少流量
2 多个JS/CSS组合,减少连接数
3 CDN就近访问
工具有
Tengine:http://tengine.taobao.org/
webback
CDN
综述
优化完成后,我们可以再次用JMeter进行性能测试,看看QPS是否变大了