今天在做以Ext3.4的基础的JS项目,但是Ext插件比较大,这样一来浏览速度就变慢,就把JS文件压缩为gzjs,但是gzjs浏览不能识别,需要一定服务端的处理。
处理步骤如下:
1、将js压缩为gzjs格式文件(注:使用gzip.exe 打包压缩js文件最后生成xx.js.gz 把xx.js.gz文件改成xx.gzjs。压缩实例: ext-all.js (610KB), gzip.exe压缩后为ext-all.gzjs(168KB)。)
说明:gzip使用方法,在命令行下输入: gzip -9 ext-all.js ext-all.js.gz
修改ext-all.js.gz的后缀名ext-all.gzjs(注:也可以通过gzip -h命令查看帮助)
下载地址:http://www.gzip.org
2、在项目web.xml中加入过滤器。
<filter> <filter-name>GzipJsFilter</filter-name> <filter-class>net.kangsoft.util.GzipJsFilter</filter-class> <init-param> <param-name>headers</param-name> <param-value>Content-Encoding=gzip</param-value> </init-param> </filter> <filter-mapping> <filter-name>GzipJsFilter</filter-name> <url-pattern>*.gzjs</url-pattern> </filter-mapping>
3、加入过滤类。
package net.kangsoft.util; import java.io.IOException; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class GzipJsFilter implements Filter { Map headers = new HashMap(); public void destroy() { } public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { if (req instanceof HttpServletRequest) doFilter((HttpServletRequest)req, (HttpServletResponse)res, chain); else chain.doFilter(req, res); } public void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException { request.setCharacterEncoding("UTF-8"); for (Iterator it = this.headers.entrySet().iterator(); it.hasNext(); ) { Map.Entry entry = (Map.Entry)it.next(); response.addHeader((String)entry.getKey(), (String)entry.getValue()); } chain.doFilter(request, response); } public void init(FilterConfig config) throws ServletException { String headersStr = config.getInitParameter("headers"); String[] headers = headersStr.split(","); for (int i = 0; i < headers.length; ++i) { String[] temp = headers[i].split("="); this.headers.put(temp[0].trim(), temp[1].trim()); } } }
4、在需导入js的页面head里面添加导入文件,如:<script type="text/javascript"
src="js/ext3/ext-all.gzjs"></script>