目标:
我使用此代码的目的是创建一个可以处理多个客户端的简单Web服务器,并且将使用html来响应" hi"当客户要求时。
代码:
这是第一名考试。它只能处理一个客户端一次:
import java.net.*;
import java.io.*;
public class Webserver1 {
public static void main(String[] args) {
ServerSocket ss;
Socket s;
try {
//set up connection
ss = new ServerSocket(80);
s = ss.accept();
} catch (Exception e) {
System.out.println(e.getMessage());
return;
}
try (
BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
DataOutputStream out = new DataOutputStream (s.getOutputStream());
) {
String inline = in.readLine();
//http request
if (inline.startsWith("GET")) {
//return http
out.writeBytes("<!doctype html><html><body><p>hi</p></body></html>");
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
这是第二个测试。它旨在处理多个客户端:
import java.net.*;
import java.io.*;
public class Webserver2 {
//class to handle connections
public static class server {
ServerSocket ss;
Socket s[] = new Socket[maxn];
public server () {
try {
ss = new ServerSocket(80);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
public InputStream getis(int num) throws Exception {
return s[num].getInputStream();
}
public OutputStream getos(int num) throws Exception {
return s[num].getOutputStream();
}
public void close() throws Exception {
for (int i = 0; i < numc; i++) {
s[i].close();
}
}
public void newc () throws Exception {
s[numc + 1] = ss.accept();
}
}
static int numc = 0;
static final int maxn = 100;
static server se = new server();
public static void main(String[] args) {
try {
while (numc < 6) {
//set up connection, and start new thread
se.newc();
numc++;
System.out.println("0");
(new Client()).start();
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
public static class Client extends Thread {
public void run() {
try(
BufferedReader in = new BufferedReader(new InputStreamReader(se.getis(numc)));
DataOutputStream out = new DataOutputStream (se.getos(numc));
) {
String inline;
while(true) {
inline = in.readLine();
//wait for http request
if (inline.startsWith("GET")) {
System.out.println("1");
//respond with header, and html
out.writeBytes("HTTP/1.1 200 OK\r\n");
out.writeBytes("Connection: close\r\n");
out.writeBytes("Content-Type: text/html\r\n\r\n");
out.writeBytes("<!doctype html><html><body><p>hi</p></body></html>");
out.flush();
}
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
}
问题:
在我的计算机上,如果我运行第一个示例,并在我的浏览器上输入:&#34; http://192.168.1.xxx&#34;,我得到一个简单的&#34; hi&#34;。但是,在第二个问题上,如果我尝试同样的事情,它根本就不起作用。但是如果在命令提示符下输入:telnet 192.168.1.xxx 80,则键入GET它会发送回html。另外,如果我用PrintWriter替换DataOutputStream,它甚至不会将它发送到telnet。但是,我知道它会尝试,因为程序打印&#34; 0&#34;每次建立连接时,&#34; 1&#34;每次打印都有。
问题:
阻止浏览器查看html的问题是什么?
是否与html本身,设置连接的方式或DataOutputStream有关?
我该如何解决这个问题?
答案 0 :(得分:0)
不要使用端口80,使用大于6000的其他随机端口。如果您没有正确关闭第一个程序,那么该程序仍然使用端口80。
我使用了与此类似的Http服务器程序。服务器还为每个连接创建多个线程,因此客户端数量不限于100。
`public class MultiThreadServer实现Runnable { 插座csocket; static int portno; static String结果; MultiThreadServer(套接字csocket) { this.csocket = csocket; }
public static void main(String args[])
throws Exception
{
portno=Integer.parseInt(args[0]);
ServerSocket srvsock = new ServerSocket(portno);
System.out.println("Listening");
while (true) {
Socket sock = srvsock.accept();
System.out.println("Connected");
new Thread(new MultiThreadServer(sock)).start();
}
}
public void run()
{
String[] inputs=new String[3];
FileInputStream fis=null;
String file=null,status=null,temp=null;
try
{
InputStreamReader ir=new InputStreamReader(csocket.getInputStream());
BufferedReader br= new BufferedReader(ir);
DataOutputStream out = new DataOutputStream(csocket.getOutputStream());
String message=br.readLine();
inputs=message.split(" ");
if(inputs[0].equals("GET"))
{
try{
out.writeBytes("HTTP/1.1 200 OK\r\n");
out.writeBytes("Connection: close\r\n");
out.writeBytes("Content-Type: text/html\r\n\r\n");
out.writeBytes("<!doctype html><html><body><p>hi</p></body> </html>");
}
out.flush();
fis.close();
csocket.close();
}
catch(Exception ex)
{
status="404 File not found";
os.println(status);
}
}`