Java基础进阶——Java IO实例

1.读取本地文件并转换为字符数组

  

private byte[] loadClassData(String name){
        FileInputStream fis = null;
        byte [] data = null;
        try {
            fis = new FileInputStream(
                new File(
                    "E:\\project\\Approve\\bin\\jack\\classloader\\test\\" + name + ".class"));
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            int ch = 0;
            while ((ch = fis.read()) != -1) {
                baos.write(ch);
            }
            data = baos.toByteArray();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return data;
    }

2.读取远程文件并转换为字符数组

private byte[] loadClassData(String name){
        byte [] data = null;
        try {
            URL urlRemote = new URL("" + name + ".class");//须保证远程文件地址可达
            URLConnection uConnection = urlRemote.openConnection();
            InputStream inputStream = uConnection.getInputStream();
            int length = uConnection.getContentLength();
            data = new byte[length];
            inputStream.read(data);
            inputStream.close();
            return data;
        } catch (Exception e) {
            System.out.println(name +"类没有找到！");
            e.printStackTrace();
        }
        return data;
    }