HTTP1.1连接:keepalive使用java实现发生在java.net.SocketTimeoutException:读取超时
我正在使用java套接字编程实现版本为1.1的http服务器。我使用的是1.0版的示例代码,我希望通过不关闭套接字来添加持久连接功能,并向服务器发送“connection:close”。然而,在我的浏览器上输入“localhost:8080/xxxx”后,我得到了“java.net.SocketTimeoutException:Read timeout”信息,并且在使用客户端程序测试时没有收到任何信息。代码太长了,我在下面提到了这件事!你能帮我找到问题吗,谢谢HTTP1.1连接:keepalive使用java实现发生在java.net.SocketTimeoutException:读取超时,java,sockets,server,http-1.1,Java,Sockets,Server,Http 1.1,我正在使用java套接字编程实现版本为1.1的http服务器。我使用的是1.0版的示例代码,我希望通过不关闭套接字来添加持久连接功能,并向服务器发送“connection:close”。然而,在我的浏览器上输入“localhost:8080/xxxx”后,我得到了“java.net.SocketTimeoutException:Read timeout”信息,并且在使用客户端程序测试时没有收到任何信息。代码太长了,我在下面提到了这件事!你能帮我找到问题吗,谢谢 ////////here is t
////////here is the server part using thread pool techs
//Webserver class
protected static Properties props = new Properties();
/* Where worker threads stand idle */
static Vector threads = new Vector();
public static void main(String[] a) throws Exception {
int port = 8080;
if (a.length > 0) {
port = Integer.parseInt(a[0]);
}
loadProps();
printProps();
/* start worker threads */
for (int i = 0; i < workers; ++i) {
Worker w = new Worker();
(new Thread(w, "worker #"+i)).start();
threads.addElement(w);
}
ServerSocket ss = new ServerSocket(port);
while (true) {
Socket s = ss.accept();
Worker w = null;
synchronized (threads) {
if (threads.isEmpty()) {
Worker ws = new Worker();
ws.setSocket(s);
(new Thread(ws, "additional worker")).start();
} else {
w = (Worker) threads.elementAt(0);
threads.removeElementAt(0);
w.setSocket(s);
}
}
}
}
//Worker class inherit from Webserver class
byte[] buf;
Worker() {
buf = new byte[BUF_SIZE];
s = null;
}
synchronized void setSocket(Socket s) {
this.s = s;
notify();
}
public synchronized void run() {
while(true) {
if (s == null) {
/* nothing to do */
try {
wait();
} catch (InterruptedException e) {
/* should not happen */
continue;
}
}
try {
handleClient();
} catch (Exception e) {
e.printStackTrace();
}
/* go back in wait queue if there's fewer
* than numHandler connections.
*/
if(!headAttri.getPersistConnec())
s = null;
//
Vector pool = WebServer.threads;
synchronized (pool) {
if (pool.size() >= WebServer.workers) {
/* too many threads, exit this one */
try{
if(s != null)
s.close();
}catch (IOException e) {
e.printStackTrace();
}
return;
} else {
if(!headAttri.getPersistConnec())
pool.addElement(this);
}
}
}
}
//in handle client I mention the socket handles here(s is the socket)
void handleClient() throws IOException {
//...
s.setSoTimeout(WebServer.timeout);
s.setTcpNoDelay(true);
//...
try{
//...handle request and response the client
//...
}finally{
//close socket if head info "Connection: close" is found
if(headAttri.getPersistConnec()){
s.setKeepAlive(true);
}
else{
s.close();
}
}
}
//////////end server part
//////here is the client part
public SimpleSocketClient()
{
String testServerName = "localhost";
int port = 8080;
try
{
// open a socket
Socket socket = openSocket(testServerName, port);
// write-to, and read-from the socket.
// in this case just write a simple command to a web server.
String result = writeToAndReadFromSocket(socket, request_str[1]);
// print out the result we got back from the server
System.out.println(result);
// close the socket, and we're done
socket.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
private Socket openSocket(String server, int port) throws Exception
{
Socket socket;
// create a socket with a timeout
try
{
InetAddress inteAddress = InetAddress.getByName(server);
SocketAddress socketAddress = new InetSocketAddress(inteAddress, port);
// create a socket
socket = new Socket();
// this method will block no more than timeout ms.
int timeoutInMs = 10*1000; // 10 seconds
socket.connect(socketAddress, timeoutInMs);
return socket;
}
catch (SocketTimeoutException ste)
{
System.err.println("Timed out waiting for the socket.");
ste.printStackTrace();
throw ste;
}
}
private String writeToAndReadFromSocket(Socket socket, String writeTo) throws Exception
{
try
{
// write text to the socket
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
bufferedWriter.write(writeTo);
bufferedWriter.flush();
//test
//bufferedWriter.write("GET src/WebServer.java HTTP/1.1\r\nHost: localhost\r\nConnection: close");
//bufferedWriter.flush();
// read text from the socket
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
StringBuilder sb = new StringBuilder();
//string handling code
String str;
while ((str = bufferedReader.readLine()) != null)
{
sb.append(str + "\n");
}
// close the reader, and return the results as a String
bufferedReader.close();
return sb.toString();
}
catch (IOException e)
{
e.printStackTrace();
throw e;
}
}
////end client part
//这是使用线程池技术的服务器部件
//Web服务器类
受保护的静态属性props=新属性();
/*工作线程处于空闲状态的位置*/
静态向量线程=新向量();
公共静态void main(字符串[]a)引发异常{
int端口=8080;
如果(a.长度>0){
port=Integer.parseInt(a[0]);
}
loadProps();
printProps();
/*启动工作线程*/
对于(int i=0;i=WebServer.workers){
/*线程太多,请退出此线程*/
试一试{
如果(s!=null)
s、 close();
}捕获(IOE异常){
e、 printStackTrace();
}
返回;
}否则{
如果(!headAttri.getPersistConnec())
池。附录(本);
}
}
}
}
//在handle client中,我在这里提到了套接字句柄(s是套接字)
void handleClient()引发IOException{
//...
s、 设置超时(WebServer.timeout);
s、 setTcpNoDelay(真);
//...
试一试{
//…处理客户端的请求和响应
//...
}最后{
//如果发现头部信息“连接:关闭”,则关闭插座
if(headAttri.getPersistConnec()){
s、 setKeepAlive(真);
}
否则{
s、 close();
}
}
}
//////////终端服务器部件
//////这是客户端部分
公共SimpleCheckClient()
{
字符串testServerName=“localhost”;
int端口=8080;
尝试
{
//打开插座
套接字=openSocket(testServerName,端口);
//对套接字进行写入和读取。
//在本例中,只需向web服务器写入一个简单的命令。
字符串结果=writeToAndReadFromSocket(socket,request_str[1]);
//打印出我们从服务器得到的结果
系统输出打印项次(结果);
//合上插座,我们就完成了
socket.close();
}
捕获(例外e)
{
e、 printStackTrace();
}
}
私有套接字openSocket(字符串服务器,int端口)引发异常
{
插座;
//创建具有超时的套接字
尝试
{
InetAddress inteAddress=InetAddress.getByName(服务器);
SocketAddress SocketAddress=新的InetSocketAddress(inteAddress,端口);
//创建一个套接字
套接字=新套接字();
//此方法的阻止时间不超过超时毫秒。
int timeoutims=10*1000;//10秒
socket.connect(socketAddress,timeoutims);
返回插座;
}
捕捉(SocketTimeoutException ste)
{
System.err.println(“等待套接字超时”);
ste.printStackTrace();
投掷ste;
}
}
私有字符串writeToAndReadFromSocket(套接字套接字,字符串writeTo)引发异常
{
尝试
{
//将文本写入套接字
BufferedWriter BufferedWriter=new BufferedWriter(new OutputStreamWriter(socket.getOutputStream());
bufferedWriter.write(writeTo);
bufferedWriter.flush();
//试验
//write(“GET src/WebServer.java HTTP/1.1\r\nHost:localhost\r\n连接:close”);
//bufferedWriter.flush();
//从套接字读取文本
BufferedReader BufferedReader=新的BufferedReader(新的InputStreamReader(socket.getInputStream());
StringBuilder sb=新的StringBuilder();
//字符串处理代码
字符串str;
而((str=bufferedReader.readLine())!=null)
{
sb.追加(str+“\n”);
}
//关闭读卡器,并返回res
//close socket if head info "Connection: close" is found
if(headAttri.getPersistConnec()){
s.setKeepAlive(true);