JAVA IO流简单读写文件

//加载本地缓存

privateString okGetBenDiRequse(String path)throws Exception {

//此文件已经存在

File file =new File(path,"json.txt");

//文件读取流(输入流)

FileInputStream inputStream =new FileInputStream(file);

//这个类是android 中的类

ByteArrayOutputStream outputStream =new ByteArrayOutputStream();

byte[] bytes = new byte[1024];

intlen=0;

while((len=inputStream.read(bytes))!=-1){

outputStream.write(bytes,0,len);

}

//不要忘记关流哦,注意关流顺序

outputStream.close();

inputStream.close();

returnoutputStream.toString();

}

//缓存

private voidwriteJsonToFile(InputStream stream) throws IOException {

//将数据写到文件中

File file =new File(cachedirectory);

file.mkdirs();

File file1 =new File(file,"json.txt");

file1.createNewFile();

FileOutputStream outputStream =new FileOutputStream(file1);

byte[] bytes = new byte[1024];

intlen=0;

while((len=stream.read(bytes))!=-1){

outputStream.write(bytes,0,len);

}

outputStream.close();

stream.close();

}