输入输出流伴随编码

输入流：将磁盘文件读入内存，防止中文乱码，需指定输入流reader的字符集

BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("D:\\test.txt"),"UTF-8"))

输入流：将网络请求返回流读入内存，防止中文乱码，需指定输入流reader的字符集

BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"))

保存为字符串

String s = null;

StringBuilder sb = new StringBuilder();

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

    sb.append(s);

}

输入流：如果需要保留文本中的：\r\n 则不能使用BufferedReader

InputStreamReader reader = new InputStreamReader(new FileInputStream("D:\\test.txt"),"UTF-8");

StringBuilder sb = new StringBuilder();

byte [] buff = new byte[2048];

int length = 0;

while(-1 != (length = reader.read(buff))){

    sb.append(new String(buff,0,length));

}
 

输出流：将内存中的数据写入到磁盘文件中，防止中文乱码，需要指定writer的字符集

BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("D:\\test.txt",true,"UTF-8")));

writer.write("我是中文");

//写出到客户端

输出流：将内存中的数据写入到磁盘文件中，防止中文乱码，需要指定writer的字符集
 BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(client.getOutputStream(),"UTF-8"));
 bw.write(responseInfo.toString());
 bw.flush();