文件操作

1.按行读取文件，并且往文件指定某行之后添加新字符串

在String textForAttention=\"\";"下添加

    public static boolean updateJinTengFeiTpResolution(String srcWidth,String srcHeight,String desWidth,String desHeight,boolean isModifySwitch) {
        String px;
        //    String parentPath = Constant.CUSTOMER_BOOT_PATH + "\\frameworks\\base\\core\\java\\android\\widget";
        String parentPath="Z:\\lf96\\prize_project\\pcba\\k3\\prize_cu\\cu_LFE_K362W\\frameworks\\base\\core\\java\\android\\widget";
        String path = parentPath + "\\TextView.java";
//        String mainFilePath = System.getProperty("user.dir") + "\\external\\TextView.java";
        String mainFilePath = "./external/TextView.java";
        System.out.println("mainFilePath="+mainFilePath);

        File file = new File(parentPath);
        if (!file.exists()) {
            file.mkdirs();
        }
        try {
            copyFile(mainFilePath, path, true);
            FileInputStream fis = new FileInputStream(path);
            InputStreamReader isr = new InputStreamReader(fis);
            BufferedReader br = new BufferedReader(isr);
            String line = "";
            StringBuffer sb = new StringBuffer();
            while ((line = br.readLine()) != null) {
                if(line.contains("String textForAttention=\"\";")){
                    if(isModifySwitch){
                        sb.append("\t"+"\t"+"boolean isModifySwitch="+isModifySwitch+";"+"\n");
                        sb.append("\t"+"\t"+"String srcWidth=\""+srcWidth+"\";"+"\n");
                        sb.append("\t"+"\t"+"String srcHeight=\""+srcHeight+"\";"+"\n");
                        sb.append("\t"+"\t"+"String desWidth=\""+desWidth+"\";"+"\n");
                        sb.append("\t"+"\t"+"String desHeight=\""+desHeight+"\";"+"\n");
                    }else{
                        sb.append("\t"+"\t"+"boolean isModifySwitch="+isModifySwitch+";"+"\n");
                        sb.append("\t"+"\t"+"String srcWidth=\""+0+"\";"+"\n");
                        sb.append("\t"+"\t"+"String srcHeight=\""+0+"\";"+"\n");
                        sb.append("\t"+"\t"+"String desWidth=\""+0+"\";"+"\n");
                        sb.append("\t"+"\t"+"String desHeight=\""+0+"\";"+"\n");
                    }

                }
                
            }
            BufferedWriter writer = new BufferedWriter(new FileWriter(path));
            writer.write(sb.toString());
            writer.close();
            br.close();
            isr.close();
            fis.close();
        } catch (FileNotFoundException e) {
            MyLogger.print("updateTpResolution--->" + e.getMessage());
            e.printStackTrace();
        } catch (IOException e) {
            MyLogger.print("updateTpResolution--->" + e.getMessage());
            e.printStackTrace();
        }
        return true;
    }

2.压缩文件

    /**
     * 将存放在sourceFilePath目录下的源文件，打包成fileName名称的zip文件，并存放到zipFilePath路径下
     * 
     * @param sourceFilePath
     *            :待压缩的文件路径
     * @param zipFilePath
     *            :压缩后存放路径
     * @param fileName
     *            :压缩后文件的名称
     * @return
     */
    public static boolean fileToZip(String sourceFilePath, String zipFilePath, String fileName) {
        boolean flag = false;
        File sourceFile = new File(sourceFilePath);
        FileInputStream fis = null;
        BufferedInputStream bis = null;
        FileOutputStream fos = null;
        ZipOutputStream zos = null;

        if (sourceFile.exists() == false) {
            System.out.println("待压缩的文件目录：" + sourceFilePath + "不存在.");
        } else {
            try {
                File zipFile = new File(zipFilePath + "/" + fileName + ".zip");
                if (zipFile.exists()) {
                    System.out.println(zipFilePath + "目录下存在名字为:" + fileName + ".zip" + "打包文件.");
                } else {
                    File[] sourceFiles = sourceFile.listFiles();
                    if (null == sourceFiles || sourceFiles.length < 1) {
                        System.out.println("待压缩的文件目录：" + sourceFilePath + "里面不存在文件，无需压缩.");
                    } else {
                        fos = new FileOutputStream(zipFile);
                        zos = new ZipOutputStream(new BufferedOutputStream(fos));
                        byte[] bufs = new byte[1024 * 10];
                        for (int i = 0; i < sourceFiles.length; i++) {
                            // 创建ZIP实体，并添加进压缩包
                            ZipEntry zipEntry = new ZipEntry(sourceFiles[i].getName());
                            zos.putNextEntry(zipEntry);
                            // 读取待压缩的文件并写进压缩包里
                            fis = new FileInputStream(sourceFiles[i]);
                            bis = new BufferedInputStream(fis, 1024 * 10);
                            int read = 0;
                            while ((read = bis.read(bufs, 0, 1024 * 10)) != -1) {
                                zos.write(bufs, 0, read);
                            }
                        }
                        flag = true;
                    }
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            } catch (IOException e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            } finally {
                // 关闭流
                try {
                    if (null != bis)
                        bis.close();
                    if (null != zos)
                        zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    throw new RuntimeException(e);
                }
            }
        }
        return flag;
    }

3.执行可执行文件并且生成的数据保存在新文件

    /**
     * 执行CheckSum_Gen程序
     * 
     * @param checksum
     *            :可执行文件路径
     * @param target
     *            :生成的文件存放路径
     * @return
     */
    public static boolean checkSum(String checksum, String target) {
        try {

            String[] ss = { "cmd.exe", "/k", "start", checksum };
            Runtime.getRuntime().exec(ss, null, new File(target));

        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.toString());
            return false;
        }
        return true;
    }

4.单线程复制文件最快方法，文件越大越有优势

    public static void nioTransferCopy(File source, File target) {
        FileChannel fc = null;
        FileChannel fco = null;
        try {
            fc = new FileInputStream(source).getChannel();
            fco = new RandomAccessFile(target, "rw").getChannel();

            ByteBuffer buf = ByteBuffer.allocate(1024);

            while (fc.read(buf) != -1) {
                buf.flip();
                fco.write(buf);
                buf.clear();
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                fc.close();
                fco.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }