前言：一直寻寻觅觅，就是找不到一个中意的文件操作类，加入我的知识体系，这个FileCopeUtil是我从E家项目中整理出来的，先这样用着呗！不是我心目中最好的，但算是比较实用的，以后再慢慢完善呗！！！
/**
* @desc 从FileCopeTool中整理过过来
* @auth 方毅超
* @time 2017/12/6 9:59
*/
public class FileCopeUtil {
private FileCopeUtil() {
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
/**
* 读取内存卡某路径的文件
* 使用:String results = tool.readerFile(URL.HtmlBasePath, "Cube.json");
*
* @param path
* @param fileName 带后缀
* @return
*/
public static String readerFile(String path, String fileName) {
String result = null;
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
File s = new File(path + "/" + fileName);
try {
FileInputStream in = new FileInputStream(s);
// 获取文件的字节数
int lenght = in.available();
// 创建byte数组
byte[] buffer = new byte[lenght];
// 将文件中的数据读到byte数组中
in.read(buffer);
result = new String(buffer, "UTF-8");
// result = EncodingUtils.getString(buffer, "UTF-8");
} catch (Exception e) {
}
}
return result;
}
/**
* path路径下的fileName文件，将字符串内容json写入
* 使用：tool.writeToJsonFile("Cube", URL.HtmlBasePath + "/", json);json为String类型
*
* @param fileName
* @param path
* @param json
* @return
*/
public static boolean writeToJsonFile(String fileName, String path, String json) {
Boolean flag = false;
// 获取sd卡目录
File file = null;
OutputStream output = null;
try {
file = new File(path);
if (!file.exists()) {
file.mkdirs(); // 创建文件夹
}
file = new File(path + fileName + ".json");
output = new FileOutputStream(file);
output.write(json.getBytes());
output.flush();
flag = true;
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
output.close();
} catch (Exception e) {
e.printStackTrace();
}
}
return flag;
}
/**
* 判断SD里某路径的文件是否存在。
* @param path
* @param fileName 带后缀
* @return
*/
public static boolean isfileExist(String path, String fileName) {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
File s = new File(path + "/" + fileName);
if (s.exists()) {
return true;
} else {
return false;
}
}
return false;
}
/**
* 删除SD卡某路径下的某个文件
* tool.deleteFile(URL.HtmlBasePath + "/" + identify + ".zip");
*
* @param path 路径+文件名
*/
public static void deleteFile(String path) {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
File s = new File(path);
s.delete();
}
}
/**
* 删除整个文件夹
* FileCopeTool.deleteFolder(URL.HtmlPath + "/" + identify);
*
* @param path 路径，无需文件名
*/
public static void deleteFolder(String path) {
File f = new File(path);
if (f.exists()) {
// LogUtil.d("com.csair.ehome","存在该文件夹");
// 在判断它是不是一个目录
if (f.isDirectory()) {
// LogUtil.d("com.csair.ehome","该文件夹是一个目录");
// 列出该文件夹下的所有内容
String[] fileList = f.list();
if (fileList == null) {
return;
}
for (int i = 0; i < fileList.length; i++) {
// 对每个文件名进行判断
// 如果是文件夹 那么就循环deleteFolder
// 如果不是，直接删除文件
String name = path + File.separator + fileList[i];
File ff = new File(name);
if (ff.isDirectory()) {
deleteFolder(name);
} else {
ff.delete();
}
}
// 最后删除文件夹
f.delete();
} else {
LogUtil.d("com.csair.ehome", "该文件夹不是一个目录");
}
} else {
LogUtil.d("com.csair.ehome", "不存在该文件夹");
}
}
/**
* 在内存卡新建一个文件夹
* @param dirPath 路劲
* @param folderName 文件夹名
*/
public static void createFile(String dirPath, String folderName) {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
File f = new File(dirPath + File.separator + folderName);
if (!f.exists()) {
LogUtil.d("com.csair.ehome", "文件夹不存在");
f.mkdirs();
}
}
}
/**
* 复制文件
* @param sourceFile
* @param targetFile
* @throws IOException
*/
public static void copyFile(File sourceFile, File targetFile)
throws IOException {
BufferedInputStream inBuff = null;
BufferedOutputStream outBuff = null;
try {
// 新建文件输入流并对它进行缓冲
inBuff = new BufferedInputStream(new FileInputStream(sourceFile));
// 新建文件输出流并对它进行缓冲
outBuff = new BufferedOutputStream(new FileOutputStream(targetFile));
// 缓冲数组
byte[] b = new byte[1024 * 5];
int len;
while ((len = inBuff.read(b)) != -1) {
outBuff.write(b, 0, len);
}
// 刷新此缓冲的输出流
outBuff.flush();
} finally {
// 关闭流
if (inBuff != null)
inBuff.close();
if (outBuff != null)
outBuff.close();
}
}
/**
* 往file中写入str
* FileCopeTool.writeString(path, outputStr,1);
* @param file
* ：路径+文件名
* @param str
* ：内容
* @param mode :0:create;1:overwrite
*/
public static int writeString(String file, String str, int mode) {
java.io.File outputFile = new java.io.File(file);
if (outputFile.exists() && mode == 0) {
return -1;
}
java.io.PrintWriter output;
try {
output = new java.io.PrintWriter(outputFile);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
return -2;
}
output.print(str);
output.close();
return 0;
}
/**
* String inputStr = FileCopeTool.readString(path);
* @param file 路径+文件名
* @return
*/
public static String readString(String file) {
// String inputStr = "";
StringBuffer inputStr = new StringBuffer();
java.io.File inputFile = new java.io.File(file);
java.util.Scanner input;
try {
input = new java.util.Scanner(inputFile);
while (input.hasNext()) {
// inputStr += input.next();
inputStr.append(input.next());
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
input.close();
return inputStr.toString();
}
/**
* 获得指定文件的byte数组
* @param filePath 路径+文件名
* @return
*/
public static byte[] readBytes(String filePath) {
byte[] buffer = null;
try {
File file = new File(filePath);
FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
byte[] b = new byte[1000];
int n;
while ((n = fis.read(b)) != -1) {
bos.write(b, 0, n);
}
fis.close();
bos.close();
buffer = bos.toByteArray();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return buffer;
}
/**
* 根据byte数组，生成文件
* @param filePath 路径+文件名
* @param bfile
*/
public static void writeBytes(String filePath, byte[] bfile) {
BufferedOutputStream bos = null;
FileOutputStream fos = null;
File file = null;
try {
File dir = new File(filePath);
if (!dir.exists() && dir.isDirectory()) {//判断文件目录是否存在
dir.mkdirs();
}
file = new File(filePath);
fos = new FileOutputStream(file);
bos = new BufferedOutputStream(fos);
bos.write(bfile);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (bos != null) {
try {
bos.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
/**
* 加密
* @param path 路径+文件名
* @param encAlgKey
*/
public static void encrypt(String path, String encAlgKey) {
String inputStr = readString(path);
byte[] outputBytes = null;
try {
outputBytes = SymEncrypt.encrypt(inputStr, encAlgKey);
writeBytes(path, outputBytes);
Log.v("encrypt", "加密已完成");
} catch (Exception e) {
e.printStackTrace();
Log.e("encrypt", "文件写入出错");
}
}
/**
* 解密
* @param path 路径+文件名
* @param strKey
*/
public static void decrypt(String path, String strKey) {
byte[] inputBytes = readBytes(path);
String outputStr = null;
try {
outputStr = SymEncrypt.decrypt(inputBytes, strKey);
writeString(path, outputStr, 1);
} catch (Exception e) {
e.printStackTrace();
Log.e("decrypt", "文件写入出错");
return;
}
if (outputStr == null) {
Log.e("decrypt", "文件写入出错");
return;
}
Log.v("decrypt", "解密完成");
}
/**
* 加密类，从SymEncrypt中复制而来
*/
public static class SymEncrypt {
public static Key getKey(byte[] arrBTmp, String alg) {
byte[] arrB = new byte[8];
int i = 0;
int j = 0;
while (i < arrB.length) {
if (j > arrBTmp.length - 1) {
j = 0;
}
arrB[i] = arrBTmp[j];
i++;
j++;
}
Key key = new javax.crypto.spec.SecretKeySpec(arrB, alg);
return key;
}
public static byte[] encrypt(String s, String strKey) {
byte[] r = null;
try {
Key key = getKey(strKey.getBytes(), "DES");
Cipher c;
c = Cipher.getInstance("DES");
c.init(Cipher.ENCRYPT_MODE, key);
r = c.doFinal(s.getBytes());
} catch (Exception e) {
e.printStackTrace();
}
return r;
}
public static String decrypt(byte[] code, String strKey) {
String r = null;
try {
Key key = getKey(strKey.getBytes(), "DES");
Cipher c;
c = Cipher.getInstance("DES");
c.init(Cipher.DECRYPT_MODE, key);
byte[] clearByte = c.doFinal(code);
r = new String(clearByte);
} catch (Exception e) {
e.printStackTrace();
}
return r;
}
}
}
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