java 系统文件读写

private String readSysfs(String path) {

if (!new File(path).exists()) {

Log.d(TAG, "readSysfs File not found: " + path);

return null;

}

String str = null;

StringBuilder value = new StringBuilder();

try {

FileReader fr = new FileReader(path);

BufferedReader br = new BufferedReader(fr);

try {

while ((str = br.readLine()) != null) {

if(str != null)

value.append(str);

};

fr.close();

br.close();

Log.d(TAG, "readSysfs value: " + value.toString());

return value.toString();

} catch (IOException e) {

e.printStackTrace();

return null;

}

} catch (FileNotFoundException e) {

e.printStackTrace();

return null;

}

}

private boolean writeSysfs(String path, String value) {

Log.d(TAG, "writeSysfs path: " + path + " value: " + value);

if (!new File(path).exists()) {

Log.d(TAG, "writeSysfs File not found: " + path);

return false;

}

try {

BufferedWriter writer = new BufferedWriter(new FileWriter(path), 64);

try {

writer.write(value);

} finally {

writer.close();

}

return true;

} catch (IOException e) {

Log.d(TAG, "IO Exception when write: " + e);

return false;

}

}