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();
}
}
}