我们java中的io流分为两大类，字节流和字符流。

可是在具体使用的时候怎么视情况进行使用？

怎么使用更加有效率？

有两个例子，帮忙看看解释一下，用哪种比较有效率以及适用情况。

下面是用字符流进行读写

写入

FileOutputStream out = null;

BufferedWriter writer = null;

try {

out = openFileOutput("data", Context.MODE_PRIVATE);

writer = new BufferedWriter(new OutputStreamWriter(out));

writer.write(inputText);

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (writer != null) {

//关闭

writer.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

读取

FileInputStream in = null;

BufferedReader reader = null;

StringBuilder content = new StringBuilder();

try {

in = openFileInput("data");

reader = new BufferedReader(new InputStreamReader(in));

String line = "";

while ((line = reader.readLine()) != null) {

content.append(line);

}

} catch (IOException e) {

e.printStackTrace();

} finally {

if (reader != null) {

try {

//关闭

reader.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

下面使用字节流读写

写入

public void WriteFiles(String content){

try {

FileOutputStream fos = openFileOutput("a.txt", MODE_WORLD_READABLE+MODE_WORLD_WRITEABLE);

fos.write(content.getBytes());

fos.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

读取

public String readFiles(){

String content = null;

try {

FileInputStream fis= openFileInput("a.txt");

ByteArrayOutputStream baos = new ByteArrayOutputStream();

byte [] buffer = new byte[1024];

int len = 0;

while ((len=fis.read(buffer))!=-1) {

baos.write(buffer, 0, len);

}

content = baos.toString();

fis.close();

baos.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return content;

}