Java IO流学习总结（三）—— readerLine()测试，空行返回值，结束时返回值

Server：

public class server {
    public static void main(String[] args) throws UnknownHostException, IOException {
        ServerSocket server = new ServerSocket(8888);
        while(true) {
            Socket client = server.accept();
            BufferedReader br = new BufferedReader(new InputStreamReader(client.getInputStream()));
            String str;
            while(null != (str = br.readLine())){
                System.out.println(str+str.isEmpty());
            }
        }
    }
}

Client:

public class client {
    public static void main(String[] args) throws UnknownHostException, IOException, InterruptedException {
        Socket client = new Socket("127.0.0.1",8888);
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));
        bw.write("efasdfa\r\n");
        bw.write("\r\n");
        bw.flush();
        bw.close();//close后readLine才返回null
    }
}

结果：

efasdfafalse
true

结论：

• BufferedReader类中的readLine()方法，在遇到\r或\n是返回该行字符串
• 返回不包含\r\n
• 如果该行为空，如http响应中响应头和响应实体之间的空行，返回的是空字符串，即 readLine().isEmpty()为true、readLine()==”“为true
• 遇到输入流中的close()，readLine()返回null，如没有close,报Connection reset异常