Java读取文件（二进制及文本文件）

1、读取二进制文件

读取二进制文件，并存入byte数组。

public byte[] readFromByteFile(String pathname) throws IOException{
    File filename = new File(pathname);
    BufferedInputStream in = new BufferedInputStream(new FileInputStream(filename));
    ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
    byte[] temp = new byte[1024];
    int size = 0;
    while((size = in.read(temp)) != -1){
        out.write(temp, 0, size);
    }
    in.close();
    byte[] content = out.toByteArray();
    return content;
}

2、读取文本文件

读取文本文件，每次读取文件一行内容，并把结果存入字符串数组。

public ArrayList<String> readFromTextFile(String pathname) throws IOException{
    ArrayList<String> strArray = new ArrayList<String>();
    File filename = new File(pathname);
    InputStreamReader reader = new InputStreamReader(new FileInputStream(filename));
    BufferedReader br = new BufferedReader(reader);
    String line = "";
    line = br.readLine();
    while(line != null) {
        strArray.add(line);
        line = br.readLine();
    }
    return strArray;
}