JS如何读取和保存文件？方法介绍

var BlobBuilder = BlobBuilder || WebKitBlobBuilder || MozBlobBuilder;

var URL = URL || webkitURL || window;

function saveAs(blob, filename) {

    var type = blob.type;

    var force_saveable_type = 'application/octet-stream';

    if (type && type != force_saveable_type) { // 强制下载，而非在浏览器中打开

        var slice = blob.slice || blob.webkitSlice || blob.mozSlice;

        blob = slice.call(blob, 0, blob.size, force_saveable_type);

    }

    var url = URL.createObjectURL(blob);

    var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');

    save_link.href = url;

    save_link.download = filename;

    var event = document.createEvent('MouseEvents');

    event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);

    save_link.dispatchEvent(event);

    URL.revokeObjectURL(url);

}

var bb = new BlobBuilder;

bb.append('Hello, world!');

saveAs(bb.getBlob('text/plain;charset=utf-8'), 'hello world.txt');

    /**

    * 写文件

    * @param fileName 文件名

    * @param data   文件流

    * @param path   写入路径

    * @return boolean

    */

    public static boolean writeFile(String fileName,String data,String path) {

       try {

//         System.out.println("fileContent:" + data);

           File file = new File(path + fileName);

           if(!file.exists()){

               file.createNewFile();

           }

           FileOutputStream outStream = new FileOutputStream(file);

           outStream.write(data.getBytes()); 

           outStream.flush();

           outStream.close();

           outStream = null;

           return(true);

       } catch (Exception e) {

           e.printStackTrace();

           return(false);

       }

    }