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我正在乱用Java中的HTTP和套接字，希望你能对此有所了解：
当我用Java SE 11编写的HTTP服务器没有读取整个请求然后响应时，客户端没有得到它或者收到错误。这是为什么？在服务器读取整个请求之前，客户端是否无法读取响应？如果在下面的代码段中执行对readBody的调用，则可以正常工作。如果响应具有Content-Length标头和文本正文，它也可以正常工作。这实际上对我来说更令人费解。
我的示例请求是带有数据fds的POST。邮递员说“无法得到任何请求”，卷曲说“卷曲：(56)Recv失败：连接由同行重置”。
import java.io.*;
import java.net.Socket;
import java.util.*;
class Handler {
public synchronized void read(Socket incoming) {
try (incoming;
OutputStream outputStream = incoming.getOutputStream();
InputStream inputStream = incoming.getInputStream();
PrintWriter pw = new PrintWriter(outputStream)) {
writeRequest(inputStream);
pw.print("HTTP/1.1 200 OK
");
pw.print("
");
pw.flush();
} catch (IOException e) {
System.out.println("ERROR: " + e.getMessage());
e.printStackTrace();
}
}
private void writeRequest(InputStream inputStream) throws IOException {
String verbLine = readLine(inputStream);
Map headers = readHeaders(inputStream);
//readBody(inputStream, headers);
}
private void readBody(InputStream inputStream, Map headers) throws IOException {
Optional optKey = headers.keySet().stream()
.filter(k -> k.equalsIgnoreCase("Content-Length"))
.findFirst();
if (optKey.isPresent()) {
int contentLength = Integer.parseInt(headers.get(optKey.get()));
byte[] bytes = inputStream.readNBytes(contentLength);
}
}
private Map readHeaders(InputStream inputStream) throws IOException {
Map headers = new HashMap<>();
while (true) {
String line = readLine(inputStream);
if (line == null || line.isEmpty()) {
return headers;
}
String key = line.split(":")[0].trim();
String value = line.split(":")[1].trim();
headers.put(key, value);
}
}
private String readLine(InputStream inputStream) throws IOException {
byte[] buf = new byte[200];
int offset = 0;
while (true) {
int read = inputStream.read();
if (read == -1) {
return null;
}
buf[offset] = (byte) read;
if (buf[0] == '
' || (buf[0] == '' && buf[1] == '
')) {
return "";
}
if (buf[offset] == 0x0A) {
int endOfLine = buf[offset - 1] == 0x0D ? offset - 1 : offset;
return new String(buf, 0, endOfLine);
} else {
offset++;
}
}
}
}