Asp.net 程序优化js,css合并与压缩
访问时将js和css压缩并且缓存在客户端,
采用的是Yahoo.Yui.Compressor组件还完成的,从这里可下载
创建一个IHttpHandler来处理文件
1 public class CombineFiles : IHttpHandler
2 {
3 private const string CacheKeyFormat = "_CacheKey_{0}_";
4
5 private const bool IsCompress = true; //需要压缩
6
7 public bool IsReusable
8 {
9 get
10 {
11 return false;
12 }
13 }
14
15 public void ProcessRequest(HttpContext context)
16 {
17 HttpRequest request = context.Request;
18 HttpResponse response = context.Response;
19
20 string cachekey = string.Empty;
21
22 string type = request.QueryString["type"];
23 if (!string.IsNullOrEmpty(type) && (type == "css" || type == "js"))
24 {
25 if (type == "js")
26 {
27 response.ContentType = "text/javascript";
28
29 }
30 else if (type == "css")
31 {
32 response.ContentType = "text/css";
33 }
34
35 cachekey = string.Format(CacheKeyFormat, type);
36
37 CompressCacheItem cacheItem = HttpRuntime.Cache[cachekey] as CompressCacheItem;
38 if (cacheItem == null)
39 {
40 string content = string.Empty;
41 string path = context.Server.MapPath("");
42 //找到这个目录下所有的js或css文件,当然也可以进行配置,需求请求压缩哪些文件
43 //这里就将所的有文件都请求压缩
44 string[] files = Directory.GetFiles(path, "*." + type);
45 StringBuilder sb = new StringBuilder();
46 foreach (string fileName in files)
47 {
48 if (File.Exists(fileName))
49 {
50 string readstr = File.ReadAllText(fileName, Encoding.UTF8);
51 sb.Append(readstr);
52 }
53 }
54
55 content = sb.ToString();
56
57 // 开始压缩文件
58 if (IsCompress)
59 {
60 if (type.Equals("js"))
61 {
62 content = JavaScriptCompressor.Compress(content);
63 }
64 else if (type.Equals("css"))
65 {
66 content = CssCompressor.Compress(content);
67 }
68 }
69
70 //输入到客户端还可以进行Gzip压缩 ,这里就省略了
71
72 cacheItem = new CompressCacheItem() { Type = type, Content = content, Expires = DateTime.Now.AddDays(30) };
73 HttpRuntime.Cache.Insert(cachekey, cacheItem, null, cacheItem.Expires, TimeSpan.Zero);
74 }
75
76 string ifModifiedSince = request.Headers["If-Modified-Since"];
77 if (!string.IsNullOrEmpty(ifModifiedSince)
78 && TimeSpan.FromTicks(cacheItem.Expires.Ticks - DateTime.Parse(ifModifiedSince).Ticks).Seconds < 0)
79 {
80 response.StatusCode = (int)System.Net.HttpStatusCode.NotModified;
81 response.StatusDescription = "Not Modified";
82 }
83 else
84 {
85 response.Write(cacheItem.Content);
86 SetClientCaching(response, cacheItem.Expires);
87 }
88 }
89
90 }
91
92 private void SetClientCaching(HttpResponse response, DateTime expires)
93 {
94 response.Cache.SetETag(DateTime.Now.Ticks.ToString());
95 response.Cache.SetLastModified(DateTime.Now);
96
97 //public 以指定响应能由客户端和共享(代理)缓存进行缓存。
98 response.Cache.SetCacheability(HttpCacheability.Public);
99
100 //是允许文档在被视为陈旧之前存在的最长绝对时间。
101 response.Cache.SetMaxAge(TimeSpan.FromTicks(expires.Ticks));
102
103 response.Cache.SetSlidingExpiration(true);
104 }
105 private class CompressCacheItem
106 {
107 /// <summary>
108 /// 类型 js 或 css
109 /// </summary>
110 public string Type { get; set; } // js css
111 /// <summary>
112 /// 内容
113 /// </summary>
114 public string Content { set; get; }
115 /// <summary>
116 /// 过期时间
117 /// </summary>
118 public DateTime Expires { set; get; }
119 }
120 }
2 {
3 private const string CacheKeyFormat = "_CacheKey_{0}_";
4
5 private const bool IsCompress = true; //需要压缩
6
7 public bool IsReusable
8 {
9 get
10 {
11 return false;
12 }
13 }
14
15 public void ProcessRequest(HttpContext context)
16 {
17 HttpRequest request = context.Request;
18 HttpResponse response = context.Response;
19
20 string cachekey = string.Empty;
21
22 string type = request.QueryString["type"];
23 if (!string.IsNullOrEmpty(type) && (type == "css" || type == "js"))
24 {
25 if (type == "js")
26 {
27 response.ContentType = "text/javascript";
28
29 }
30 else if (type == "css")
31 {
32 response.ContentType = "text/css";
33 }
34
35 cachekey = string.Format(CacheKeyFormat, type);
36
37 CompressCacheItem cacheItem = HttpRuntime.Cache[cachekey] as CompressCacheItem;
38 if (cacheItem == null)
39 {
40 string content = string.Empty;
41 string path = context.Server.MapPath("");
42 //找到这个目录下所有的js或css文件,当然也可以进行配置,需求请求压缩哪些文件
43 //这里就将所的有文件都请求压缩
44 string[] files = Directory.GetFiles(path, "*." + type);
45 StringBuilder sb = new StringBuilder();
46 foreach (string fileName in files)
47 {
48 if (File.Exists(fileName))
49 {
50 string readstr = File.ReadAllText(fileName, Encoding.UTF8);
51 sb.Append(readstr);
52 }
53 }
54
55 content = sb.ToString();
56
57 // 开始压缩文件
58 if (IsCompress)
59 {
60 if (type.Equals("js"))
61 {
62 content = JavaScriptCompressor.Compress(content);
63 }
64 else if (type.Equals("css"))
65 {
66 content = CssCompressor.Compress(content);
67 }
68 }
69
70 //输入到客户端还可以进行Gzip压缩 ,这里就省略了
71
72 cacheItem = new CompressCacheItem() { Type = type, Content = content, Expires = DateTime.Now.AddDays(30) };
73 HttpRuntime.Cache.Insert(cachekey, cacheItem, null, cacheItem.Expires, TimeSpan.Zero);
74 }
75
76 string ifModifiedSince = request.Headers["If-Modified-Since"];
77 if (!string.IsNullOrEmpty(ifModifiedSince)
78 && TimeSpan.FromTicks(cacheItem.Expires.Ticks - DateTime.Parse(ifModifiedSince).Ticks).Seconds < 0)
79 {
80 response.StatusCode = (int)System.Net.HttpStatusCode.NotModified;
81 response.StatusDescription = "Not Modified";
82 }
83 else
84 {
85 response.Write(cacheItem.Content);
86 SetClientCaching(response, cacheItem.Expires);
87 }
88 }
89
90 }
91
92 private void SetClientCaching(HttpResponse response, DateTime expires)
93 {
94 response.Cache.SetETag(DateTime.Now.Ticks.ToString());
95 response.Cache.SetLastModified(DateTime.Now);
96
97 //public 以指定响应能由客户端和共享(代理)缓存进行缓存。
98 response.Cache.SetCacheability(HttpCacheability.Public);
99
100 //是允许文档在被视为陈旧之前存在的最长绝对时间。
101 response.Cache.SetMaxAge(TimeSpan.FromTicks(expires.Ticks));
102
103 response.Cache.SetSlidingExpiration(true);
104 }
105 private class CompressCacheItem
106 {
107 /// <summary>
108 /// 类型 js 或 css
109 /// </summary>
110 public string Type { get; set; } // js css
111 /// <summary>
112 /// 内容
113 /// </summary>
114 public string Content { set; get; }
115 /// <summary>
116 /// 过期时间
117 /// </summary>
118 public DateTime Expires { set; get; }
119 }
120 }
最后在配置文件中配置一下CombineFiles.axd文件,具体配置略
引用如下
<script type="text/javascript" src="/js/CombineFiles.axd?type=js"></script>
<link rel="stylesheet" type="text/css" href="/css/CombineFiles.axd?type=css" />