如何在byte []中传递charcter以复制到文件中 [英] how to pass charcter in byte [] to copy into file

问题描述

我想将字符串附加到文件的下面是代码*

i get error



byte [] test =％PDF -1.5; //错误在这里

任何方式通过这个？



fis = new FileInputStream（" sdcard / pdf / a.pdf"）;

fos = new FileOutputStream（" sdcard / pdf / b.pdf"）;

fastcopy（fis，fos）;





以下是代码

public static void fastcopy（InputStream is，OutputStream os）抛出IOException {

byte [] bytes = new byte [64];

int numBytes;

byte [] test =％PDF-1.5; //错误在这里< br $>


os.write（test）;

while（（numBytes = is.read（bytes））！= -1）{



os.write（bytes，0，numBytes）;

}

os.flush（）;

os.close（）;

is.close（）;



}

i want to append string into begning of file below is code *
i get error

byte []test="%PDF-1.5";// error here
any way to pass this ??

fis = new FileInputStream("sdcard/pdf/a.pdf");
fos = new FileOutputStream("sdcard/pdf/b.pdf");
fastcopy(fis, fos);


below is code
public static void fastcopy(InputStream is, OutputStream os) throws IOException {
byte[] bytes = new byte[64];
int numBytes;
byte []test="%PDF-1.5";// error here

os.write(test);
while ((numBytes = is.read(bytes)) != -1) {

os.write(bytes, 0, numBytes);
}
os.flush();
os.close();
is.close();

}

推荐答案

您不能指定 st响铃到没有转换的字节[]。



阅读以下内容：http://developer.android.com/training/basics/data-storage/files.html [ ^ ]

http://developer.android.com/reference/java/io/StringWriter.html [ ^ ]

You can't assign a string to a byte[] without conversion.

Read the following : http://developer.android.com/training/basics/data-storage/files.html[^]
http://developer.android.com/reference/java/io/StringWriter.html[^]

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