blackberry操作sdcard中的文件(创建文件夹/读文件/写文件)

/**
* 创建用户资源文件夹
*
* @param fileRootUri
* @param userQpin
* @return
* @throws Exception
*/
public String createUserResourceFolder(String userQpin) {
String openUri = "";
if (!isExistSDCard) {
openUri = STORE_URI;
} else {
openUri = SDCARD_URI;
}
FileConnection fc = null;
try {
fc = (FileConnection) Connector.open(openUri);
if (!fc.exists()) {
fc.mkdir();
}
fc.close();
fc = (FileConnection) Connector.open(openUri + userQpin + "/");
if (!fc.exists()) {
fc.mkdir();
}
return fc.getURL();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fc != null) {
try {
fc.close();
} catch (IOException e) {
}
fc = null;
}
}
return null;

}

/**
* 保存文件至指定的文件夹下
*
* @param folder
*            [] 具体参数请参考 example:String[] IMAGE_FOLDER = { "/image/", ".jpg"
*            }
* @param String
*            返回文件存的路径
* @return
*/
public String writeFile(String userQpin, String fileName, String[] folder,
byte[] data) {
FileConnection fc = null;
String openUri = null;
OutputStream outStream = null;
if (!isExistSDCard) {
openUri = STORE_URI;
} else {
openUri = SDCARD_URI;
}
openUri = openUri + userQpin;
String fileFolderUri = openUri + folder[0];
String filePathUri = openUri + folder[0] + fileName + folder[1];
try {
fc = (FileConnection) Connector.open(fileFolderUri);
if (!fc.exists()) {
fc.mkdir(); // create the file if it doesn't exist
}
fc.close();
fc = (FileConnection) Connector.open(filePathUri);
if (!fc.exists()) {
fc.create();
}
if (data != null && data.length > 0) {
outStream = fc.openOutputStream(fc.fileSize());
outStream.write(data);
outStream.flush();
}
return fc.getPath() + fc.getName();
} catch (IOException e) {
e.printStackTrace();
LogUtil.DEBUG(LogUtil.UNIT_TEST, "save error");
} finally {
try {
if (fc != null) {
fc.close();
}
if (outStream != null) {
outStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}

/**
* 读取文件
* @param userQpin
* @param fileName
* @param folder
* @return
*/
public byte[] readFile(String filePathUri) {

FileConnection fc = null;
DataInputStream in = null;
try {
fc = (FileConnection) Connector.open(filePathUri);
in = fc.openDataInputStream();
int length = (int)fc.fileSize();
byte[] data = new byte[length];
in.read(data, 0, length);
return data;
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fc != null) {
fc.close();
}
if (in != null) {
in.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}

/**
* 删除文件
*
* @param filePathUri
* @return
*/
public boolean deleteFile(String filePathUri) {
FileConnection fc = null;
try {
fc = (FileConnection) Connector.open(filePathUri);
fc.delete();
return true;
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fc != null) {
fc.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return false;
}

/**
* 检查当前手机是否挂载SDcard
*
* @return
*/
public boolean isExistSDCard() {
Enumeration euu = null;
try {
euu = FileSystemRegistry.listRoots();
while (euu.hasMoreElements()) {
String str = (String) euu.nextElement();
if (str.endsWith("/")) {
str = str.substring(0, str.length() - 1);
}
if (SDCARD_STRING.equals(str)) {
return true;
}
}
} catch (Exception e) {
e.printStackTrace();
}
return false;
}