android 把字串內容儲存到指定路徑

1. public static void saveFile(String str) {  
2.     String filePath = null;  
3.     boolean hasSDCard = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);  
4.     if (hasSDCard) {  
5.         filePath = Environment.getExternalStorageDirectory().toString() + File.separator + "hello.txt";  
6.     } else  
7.         filePath = Environment.getDownloadCacheDirectory().toString() + File.separator + "hello.txt";  
8.       
9.     try {  
10.         File file = new File(filePath);  
11.         if (!file.exists()) {  
12.             File dir = new File(file.getParent());  
13.             dir.mkdirs();  
14.             file.createNewFile();  
15.         }  
16.         FileOutputStream outStream = new FileOutputStream(file);  
17.         outStream.write(str.getBytes());  
18.         outStream.close();  
19.     } catch (Exception e) {  
20.         e.printStackTrace();  

1.     }  
   

/**
* 從快取中讀取工作平臺資料
*/
public static String getWorktableBeanFromCache(Context context){
try {
File file = new File(context.getCacheDir().getAbsolutePath()+File.pathSeparator+"workPlatform");
if(!file.exists() || !file.canRead())return null;
long lastModified = file.lastModified();
if((System.currentTimeMillis() - lastModified)>Constant.FILE_CACHE_EXPIRES_HOUR*3600*1000){
file.delete();
return null;
}
FileInputStream fin = new FileInputStream(file);
BufferedReader br = new BufferedReader(new InputStreamReader(fin));
StringBuilder sb = new StringBuilder("");
String temp ;
while((temp=br.readLine())!=null){
sb.append(temp);
}
br.close();
fin.close();
LogManagerControl.ShowLog("tssc",sb.toString(), "i");
// sb=null;
return sb.toString();
} catch (Exception e) {

}
return null;
}
/**
* 向快取中寫入工作平臺資料
*/
public static void writeWorktableBeanToCache(Context context,String json){
try {
if(TextUtils.isEmpty(json)){
return;
}

File file = new File(context.getCacheDir().getAbsolutePath()+File.pathSeparator+"workPlatform");
if(file.exists()){
file.delete();
}
if(file.createNewFile()){
FileOutputStream out = new FileOutputStream(file);
out.write(json.getBytes());
out.flush();
out.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}

String FILENAME = "hello_file";
    String string = "hello world!";
    FileOutputStream fos;
    try
    {
        fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
        fos.write(string.getBytes());
        fos.close();
    } 
    catch (FileNotFoundException e) { e.printStackTrace(); } 
    catch (IOException e) { e.printStackTrace(); }



    FileInputStream in = null;
    try
    {
        in = openFileInput("hello_file.txt");
        StringBuffer fileContent = new StringBuffer("");

        byte[] buffer = new byte[1024];

        while(in.read(buffer) != -1)
        {
            fileContent.append(new String(buffer));
        }
        finall = fileContent.toString();
    }
    catch (FileNotFoundException e) { e.printStackTrace(); } 
    catch (IOException e) { e.printStackTrace(); }

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