BufferedReader BufferedWriter HttpURLConnection

BufferedReader和BufferedWriter: 字符流, BufferedReader有readline（）方法从网络中读取数据URL url = new URL(urlStr);HttpURLConnection con = (HttpURLConnection)url.openConnection();BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream()));BufferedWriter bw = new BufferedWriter(new FileWriter(file));BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));bw.write("something");bw.newLine();bw.close();BufferedReader br = new BufferedReader(new FileReader(file));BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)));String line = br.readLine();InputStream与OutputStream: 字节流 //常用于处理图片、声音等二进制文件，汉字之类的无法处理，如“a你好”BufferedInputStream与BufferedOutputStream 处理字节流BufferedInputStream bis = new BufferedInputStream(con.getInputStream());BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file1));while (bis.available() > 0) {System.out.println((char)bis.read()); //bis.read()返回ASCII码值：int}byte[] buffer = new byte[1024];int num = -1;while((num = bis.read(buffer)) != -1){System.out.println("hello");bos.flush();bos.write(buffer, 0, num);}bos.close();bis.close();