请求正文比客户端发送更短 - HttpServer Java

Question

我使用Http Server创建Java应用程序，如下所示：

public class Application 
{
public static void main(String args[])
{
    HttpServer httpPaymentServer;
    httpPaymentServer = HttpServer.create(new InetSocketAddress(Config.portPayment), 0);
    httpPaymentServer.createContext("/json", new Payment("json"));
}
public class Payment implements HttpHandler
{
    public Payment(String dataType)
    {
    }
    public void handle(HttpExchange httpExchange) throws IOException 
    { 
        String body = "";
        if(httpExchange.getRequestMethod().equalsIgnoreCase("POST")) 
        {
            try 
            {
                Headers requestHeaders = httpExchange.getRequestHeaders();
                Set<Map.Entry<String, List<String>>> entries = requestHeaders.entrySet();
                int contentLength = Integer.parseInt(requestHeaders.getFirst("Content-length"));
                InputStream inputStream = httpExchange.getRequestBody();
                byte[] postData = new byte[contentLength];
                int length = inputStream.read(postData, 0, contentLength);
                if(length < contentLength)
                {                   
                }
                else
                {
                    String fullBody = new String(postData);                 
                    Map<String, String> query = Utility.splitQuery(fullBody);
                    body = query.getOrDefault("data", "").toString();
                }
            } 
            catch (Exception e) 
            {
                e.printStackTrace(); 
            }    
        }
    }
}
}

在我的服务器（Centos 7）上，在第一次请求时，没问题。但是在下一个请求中，并不是所有的请求体都可以被读取。但在我的电脑上（Windows 10）没问题。问题是什么。

Answer 1

对于你的InputStream，你只需要调用一次read - 它可能不会返回所有数据。那时甚至可能没有收到这些数据。

相反，您应该在循环中调用read，直到获得所有字节（当您到达流的末尾时read返回-1）。或者使用How to read / convert an InputStream into a String in Java?建议的方法之一

Answer 2

谢谢。这对我有用

public void handle(HttpExchange httpExchange) throws IOException 
{
    String body = "";
    if(httpExchange.getRequestMethod().equalsIgnoreCase("POST")) 
    {
        try 
        {
            Headers requestHeaders = httpExchange.getRequestHeaders();
            Set<Map.Entry<String, List<String>>> entries = requestHeaders.entrySet();
            int contentLength = Integer.parseInt(requestHeaders.getFirst("Content-length"));
            InputStream inputStream = httpExchange.getRequestBody();             
            int j;
            String fullBody = "";
            for(j = 0; j < contentLength; j++)
            {
                byte b = (byte) httpExchange.getRequestBody().read();
                fullBody += String.format("%c", b);
            }
            Map<String, String> query = Utility.splitQuery(fullBody);
            body = query.getOrDefault("data", "").toString();
        } 
        catch (Exception e) 
        {
            e.printStackTrace(); 
        }
    }
}