yuicompressor java_使用YUICompressor自动压缩JavaWeb项目中的JS与CSS文件

使用YUICompressor自动压缩JavaWeb项目中的JS与CSS文件

### 引入Maven依赖

“`html

com.yahoo.platform.yui

yuicompressor

2.4.8

“`

Java 代码

“`java

package com.itshidu.jeelite.common.web;

import com.itshidu.jeelite.common.util.CompressorUtil;

import javax.servlet.*;

import javax.servlet.annotation.WebFilter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.File;

import java.io.IOException;

import java.util.concurrent.ConcurrentHashMap;

/**

* 自动压缩JS与CSS

* 当访问指定的目录时，会自动压缩并重定向，我们正常开发访问即可

*/

@WebFilter(urlPatterns={“/res/*”})

public class YUICompressorFilter implements Filter{

//URL对应的文件最后修改时间是什么

private static ConcurrentHashMap LastModify = new ConcurrentHashMap();

/* —- Filter —- */

@Override

public void destroy() { }

@Override

public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain chain)

throws IOException, ServletException {

HttpServletRequest request = (HttpServletRequest) arg0;

HttpServletResponse response = (HttpServletResponse) arg1;

ServletContext application = request.getServletContext();

//String basepath=request.getScheme()+”://”+request.getServerName()+”:”+request.getServerPort()+request.getContextPath()+”/”;

String distpath = “/WEB-INF/yuimin”;

String distDirAbs = application.getRealPath(distpath); //发布的真实文件路径

String path = request.getServletPath(); //访问的URL：/res/xx/xxxx.js

String srcabs = application.getRealPath(path);

File srcfile = new File(srcabs); //访问的源文件

File distfile = new File(distDirAbs,path); //最终发布在项目中的压缩文件

if(!path.endsWith(“.js”)&&!path.endsWith(“.css”)){

chain.doFilter(request,response);return;

}

if(!distfile.getParentFile().exists()){

distfile.getParentFile().mkdirs();

}

if(!srcfile.exists()){ //源文件不存在

chain.doFilter(request,response);return;

}

if(LastModify.get(path)==null#124;#124;srcfile.lastModified()!=LastModify.get(path)){ //如果源文件被修改

CompressorUtil.compress(srcfile,distfile);

LastModify.put(path,srcfile.lastModified());

System.out.println(“压缩:”+path);

}

request.getRequestDispatcher(distpath+path).forward(request,response);

}

@Override

public void init(FilterConfig arg0) throws ServletException { }

}

“`