Question

基本上我已经创建了一个读取传入数据包的java服务器，但问题是当一个post数据包到来时它没有读取包含实际数据的主体部分，它将消息显示为POST /index.html http/1.1

以下是我在服务器上阅读数据的方法：

try{
    IR = new InputStreamReader(socket.getInputStream());
}catch(Exception ie){
    System.out.println("Cound'nt create IR");
}

BufferedReader BR = new BufferedReader(IR);
String MESSAGE = null;
try{
    MESSAGE = BR.readLine();
}catch(Exception ie){
    System.out.println("Cound'nt Receive Message");
}
System.out.println(MESSAGE);

您能否告诉我如何阅读收到的信息包的正文？

Answer 1

如果您使用Java 8，则可以执行

List<String> content = BR.lines().collect(Collectors.toList());

否则你可以做到

List<String> content = new ArrayList<>();
String line;
while((line = BR.readLine()) != null) {
   content.add(line);
}

然后解析/格式化，以便作为整体获得响应。

Answer 2

BR.readLine()仅返回第一行;你需要遍历BufferedReader来读取所有行。一种可能的方式是：

String fullMessage;
String aux;
do{
    aux = BR.readLine();
    fullMessage = fullMessage.concat(aux);
}while(aux != null);

这只是举例说明这个想法。

阅读文档：https://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html#readLine()

java 7 +的示例

    String message = null;
    //Try with resources, java will handle the closing of the stream, event if exception is thrown.
    try (   InputStreamReader inputStream = new InputStreamReader(socket.getInputStream());
            BufferedReader bufferReader = new BufferedReader(inputStream);) {

        String aux = null;
        do {
            aux = bufferReader.readLine();
            message = message.concat(aux);
        } while (aux != null);

    } catch (IOException e) {
        System.out.println("Failed to read input stream from socket");
    }

    System.out.println("Message: " + message);

对于旧版本的java，您可以使用：

    InputStreamReader inputStream = null;
    BufferedReader bufferReader = null;
    String message = null;
    try {
        inputStream = new InputStreamReader(socket.getInputStream());
        bufferReader = new BufferedReader(inputStream);
        String aux = null;
        do {
            aux = bufferReader.readLine();
            message = message.concat(aux);
        } while (aux != null);

        inputStream.close();
        bufferReader.close();
    } catch (IOException e) {
        //Read throws IOException, don't just use Exception (this could hide other exceptions that you are not treating).
        System.out.println("Failed to read input stream from socket");
    } finally{
        //Use 2 try-catch, if you only use one and the first fails, the second will never close.
        try{inputStream.close();}catch(IOException ioe){}
        try{bufferReader.close();}catch(IOException ioe){}
    } 


     System.out.println("Message: "+message);

编辑：抱歉追加是针对StringBuffer和StringBuilder的，不好意思。

EDIT2：添加了2个包含更多信息的示例。

如何在java

2 个答案: