1. 텍스트파일 vs 바이너리 파일
- 바이너리 파일 : 문자와 숫자가 저장되어 있는 파일
- 데이터를 있는 그대로 읽고 쓴다.
- 텍스트 파일 : 문자만 저장되어 있는 파일
- 숫자를 문자로 변환 후 쓴다.
2. MIME(Multipurpose Internet Mail Extensions)
- 텍스트 기반 프로토콜에 바이너리 데이터를 전송하기 위해 고안
- HTTP의 Content-Type헤더에 사용 - 데이터의 타입을 명시
- STS3 코드
@Controller
public class RequestHeader {
@RequestMapping("/requestHeader")
public void main(HttpServletRequest request) {
Enumeration<String> e = request.getHeaderNames();
while(e.hasMoreElements()) {
String name = e.nextElement();
System.out.println(name + ":" + request.getHeader(name));
}
}
}@Controller
public class RequestMassage {
@RequestMapping("requestMassage")
public void main(HttpServletRequest request) throws Exception {
// 1. request line
String requestLine = request.getMethod(); // GET 또는 POST
requestLine += " " + request.getRequestURI(); // ch2/requestMassage
String queryString = request.getQueryString(); // year=2021&month=10&day=1
requestLine += queryString == null ? "" : "?" + queryString;
requestLine += " " + request.getProtocol(); // HTTP/1.1
System.out.println(requestLine);
// 2. request headers
Enumeration<String> e = request.getHeaderNames();
while(e.hasMoreElements()) {
String name = e.nextElement();
System.out.println(name + ":" + request.getHeader(name));
}
// 3. request body - POST일 때만 해당, GET은 body가 없음(CONTENT_LENGTH=0)
final int CONTENT_LENGTH = request.getContentLength();
if(CONTENT_LENGTH > 0) {
byte[] content = new byte[CONTENT_LENGTH];
InputStream in = request.getInputStream();
in.read(content, 0, CONTENT_LENGTH);
System.out.println();
System.out.println(new String(content, "utf-8")); // year=2021&month=10&day=1
}
}
}
3. Base64
- 바이너리 데이터를 텍스트 데이터로 변환할 때 사용
- 64진법은 '0'~'9', 'A'~'Z', 'a'~'z', '+', '/' 모두 64개(6 bit)의 문자로 구성
- VSCode
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" 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