压缩js css文件代码,Java代码库,德仔网

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【Java】压缩js css文件
作者: / 发布于2016/1/18/ 646
本来项目使用的是maven，但是jar包一时不能放入项目的仓库中。临时找到的替代方案。指定需要压缩的 js，css文件目录，执行即可。选中的目录及目录里的文件中的文件都会被压缩。准备工作需要导入yuicompressor-2.4.7.jar
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.Reader;
import java.io.Writer;
 
import org.mozilla.javascript.ErrorReporter;
import org.mozilla.javascript.EvaluatorException;
 
import com.yahoo.platform.yui.compressor.CssCompressor;
import com.yahoo.platform.yui.compressor.JavaScriptCompressor;
 
public class Test {
 
    //../mobile-h5-web/src/main/webapp/h5/assets/js/views/
    //../mobile-h5-web/src/main/webapp/h5/resource/css
    //../mobile-h5-web/src/main/webapp/h5/resource/js
    // 需要压缩的目录
    File dir = new File("C:\\views");
 
    int linebreakpos = -1;
    boolean munge = true;
    boolean verbose = false;
    boolean preserveAllSemiColons = false;
    boolean disableOptimizations = false;
 
    public void testMain() throws Exception {
        checkFile(dir);
 
    }
 
    public void checkFile(File file) throws Exception {
 
        String fileName = file.getName();
 
        // file 要处理的目录
        if (fileName.endsWith(".svn"))
            return;
 
        if (fileName.endsWith(".min.js") || fileName.endsWith(".min.css")) {
            return;
        }
 
        if (file.isFile()) {
            jsZip(file);
            return;
        }
 
        File[] files = file.listFiles();
        if (files == null || files.length == 0)
            return;
 
        for (File f : files) {
            if (file.getName().endsWith(".svn"))
                return;
 
            if (file.isFile()) {
                jsZip(file);
                continue;
            }
            checkFile(f);
        }
        System.out.println("-----checkfile结束------");
    }
 
    /**
     * @param file
     *            需要压缩的目录
     * @throws Exception
     */
    public void jsZip(File file) throws Exception {
        String fileName = file.getName();
        String lastName = null;
        String cutfilePath = null;
 
        // fileName：当前正在压缩的文件为
        System.out.println("正在压缩的文件为" + fileName);
        if (fileName.endsWith(".js") == false
                && fileName.endsWith(".css") == false) {
            return;
        }
         
        Reader in = new FileReader(file);
 
        String filePath = file.getAbsolutePath();
 
        File tempFile = new File(filePath + ".tempFile");
        Writer out = new FileWriter(tempFile);
 
 
        if (fileName.endsWith(".js")) {
            lastName = ".min.js";
            cutfilePath = filePath.substring(0, filePath.indexOf(".js"));
        } else if (fileName.endsWith(".css")) {
            lastName = ".min.css";
            cutfilePath = filePath.substring(0, filePath.indexOf(".css"));
        }
        File newFileName = new File(cutfilePath + lastName);
 
        // 如果该文件存在则删除，重新创建该文件
        if (newFileName.exists()) {
            System.out.println(newFileName + "文件已存在，正在删除并重新创建！");
            newFileName.delete();
            newFileName = new File(cutfilePath + lastName);
        }
 
        if (fileName.endsWith(".js")) {
            JavaScriptCompressor jscompressor = new JavaScriptCompressor(in,
                    new ErrorReporter() {
 
                        public void warning(String message, String sourceName,
                                int line, String lineSource, int lineOffset) {
                            if (line < 0) {
                                System.err.println("\n[WARNING] " + message);
                            } else {
                                System.err.println("\n[WARNING] " + line + ':'
                                        + lineOffset + ':' + message);
                            }
                        }
 
                        public void error(String message, String sourceName,
                                int line, String lineSource, int lineOffset) {
                            if (line < 0) {
                                System.err.println("\n[ERROR] " + message);
                            } else {
                                System.err.println("\n[ERROR] " + line + ':'
                                        + lineOffset + ':' + message);
                            }
                        }
 
                        public EvaluatorException runtimeError(String message,
                                String sourceName, int line, String lineSource,
                                int lineOffset) {
                            error(message, sourceName, line, lineSource,
                                    lineOffset);
                            return new EvaluatorException(message);
                        }
                    });
 
            jscompressor.compress(out, linebreakpos, munge, verbose,
                    preserveAllSemiColons, disableOptimizations);
        } else if (fileName.endsWith(".css")) {
            CssCompressor csscompressor = new CssCompressor(in);
            csscompressor.compress(out, linebreakpos);
        }
        out.close();
        in.close();
        // file.delete();
        tempFile.renameTo(newFileName);
        tempFile.delete();
    }
 
    public static void main(String[] args) {
        try {
            new Test().testMain();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
}
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