本次实验客户端是浏览器，服务器通过代码实现
废话少说,附上代码：
import java.net.ServerSocket;
import java.net.Socket;
import java.awt.im.InputContext;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Socket;
import java.util.StringTokenizer;
public final class WebServer {
public static void main(String[] args) throws Exception {
//创建端口号码
int port = 8080;
//创建监听套接字,并指明在那个端口号处监听
ServerSocket socket = new ServerSocket(port);
//处理一个死循环中的 HTTP 服务请求
while(true)
{
//client监听一个 TCP 连接请求
Socket connection = socket.accept();
// 构造一个对象来处理 HTTP 请求消息
HttpRequest request = new HttpRequest(connection);
//创建一个新的线程来处理请求
Thread thread = new Thread(request);
//开始新线程
thread.start();
}
}
}
final class HttpRequest implements Runnable {
final static String CRLF = "\r\n";
Socket socket;
//构造函数
public HttpRequest(Socket socket) {
this.socket = socket;
}
@Override
public void run() {
try {
processRequest();
} catch (Exception e) {
System.out.println(e);
}
}
private void processRequest() throws Exception {
//获取套接字的输入和输出流的引用
InputStream is = socket.getInputStream();
DataOutputStream os = new DataOutputStream(socket.getOutputStream());
//设置输入流的缓冲
BufferedReader br = new BufferedReader(new InputStreamReader(is));
//获取请求的 HTTP 请求消息的行
String requestLine = br.readLine();
//显示请求行
System.out.println();
System.out.println(requestLine);
//得到且显示获取的头部
String headerLine = null;
while ((headerLine = br.readLine()).length() != 0) {
System.out.println(headerLine);
}
//从请求行中提取文件名。
StringTokenizer tokens = new StringTokenizer(requestLine);
tokens.nextToken();
String fileName = tokens.nextToken();
//前面加上“.”所以，在当前目录下的文件的请求
fileName = '.' + fileName;
//打开文件流和文件信息
FileInputStream fis = null;
boolean fileExists = true;
try {
fis = new FileInputStream(fileName);
} catch (FileNotFoundException e) {
fileExists = false;
}
//构建响应信息
String statusLine = null;
String contentTypeLine = null;
String entityBody = null;
if (fileExists) {
statusLine = "HTTP/1.1 200 OK" + CRLF;
contentTypeLine = "Content-type:" + contentType(fileName) + CRLF;
} else {
statusLine = "HTTP/1.1 404 Not Found" + CRLF;
contentTypeLine = "Content-type: text/html" + CRLF;
entityBody = "<HTML>" +
"<HEAD><TITLE>Not Found</TITLE></HEAD>" +
"<BODY>Not Found</BODY></HTML>";
}
//发送状态行
os.writeBytes(statusLine);
//发送链接类型
os.writeBytes(contentTypeLine);
///发送一个空白行，以指示头行的结束
os.writeBytes(CRLF);
if (fileExists) {
sendBytes(fis, os);
fis.close();
} else {
os.writeBytes(entityBody);
}
}
private void sendBytes(FileInputStream fis, DataOutputStream os) throws IOException {
//构建1M缓冲的方式字节
byte[] buffer = new byte[1024*1024];
int bytes = 0;
//将请求的文件复制到套接字的输出流中
while ((bytes = fis.read(buffer)) != -1) {
os.write(buffer, 0, bytes);
socket.shutdownOutput();
}
}
private static String contentType(String fileName) {
if (fileName.endsWith(".htm") || fileName.endsWith(".html")) {
return "text/html";
}
if (fileName.endsWith(".jpg") || fileName.endsWith(".jpeg")){
return "image/jpeg";
}
if (fileName.endsWith(".txt")) {
return "text/plain";
}
return "application/octet-stream";
}
}
注意：客户端浏览器发送请求之后一直得不到相应消息，原因是连接套接字被阻塞。
解决方法: 在完成将请求的文件复制到套接字的输出流后，说明数据发送完毕，不再发送更多数据。
socket.shutdownOutput();
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