编译命令行："C:\Program Files (x86)\Java\jdk1.8.0_20\bin\javac.exe" *.java
运行命令：java WebServer
源码：
import java.io.*;
import java.net.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;
public class WebServer {
public static void main(String[] args) throws IOException {
try {
//connection number
int i = 1;
//establish server socket
ServerSocket s = new ServerSocket(8189);
while (true) {
//wait for client connection
Socket incoming = s.accept();
System.out.println("WebServer running on port: " + s.getLocalPort());
System.out.println("The connection number is: " + i);
Runnable r = new ThreadHandler(incoming);
Thread t = new Thread(r);
t.start();
i++;
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* This class handles the client input for one server socket
*/
class ThreadHandler implements Runnable {
private Socket incomig;
public ThreadHandler(Socket i) {
incomig = i;
}
public void run() {
try {
try {
InputStream inStream = incomig.getInputStream();
OutputStream outStream = incomig.getOutputStream();
Scanner in = new Scanner(inStream);
PrintWriter out = new PrintWriter(outStream, true);
while (true) {
String line = in.nextLine();
if (line.equals("\r\n") && line.equals("")) {
break;
}
System.out.println("the client request is :" + line);
//read request line
String[] requests = line.split("\\s+");
//read request head
Map<String, String> headMap = null;
//read request body
Map<String, String> parameterMap = null;
if (requests[0].equals("GET")) {
//response GET request
//respense with the file that the request wants
String path = System.getProperties().getProperty("user.dir") + requests[1].replaceAll("\\/", "//");
System.out.println("The file that the client wants is:" + path);
//read request head
headMap = readhead(in);
//read request body
parameterMap = readbody(in);
doGet(path, out);
} else if (requests[0].equals("POST")) {
//response POST request
//response with the file that the request wants and write the parameter at the of the file
String path = System.getProperties().getProperty("user.dir") + requests[1].replaceAll("\\/", "//");
System.out.println("The file that the client wants is:" + path);
//read request head
headMap = readhead(in);
//read request body
parameterMap = readbody(in);
doPost(path, out, parameterMap);
}
}
} finally {
incomig.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
private Map<String, String> readhead(Scanner in) {
String headline = in.nextLine();
Map<String, String> headMap = new HashMap<>();
while (!headline.equals("\r\n") && !headline.equals("")) {
String[] keyValue = {"", ""};
String[] temp = headline.split(": |:");
if (temp.length == 2) {
keyValue = temp;
}
if (temp.length == 1) {
keyValue[0] = temp[0];
}
headMap.put(keyValue[0], keyValue[1]);
headline = in.nextLine();
}
return headMap;
}
private Map<String, String> readbody(Scanner in) {
String bodyline = in.nextLine();
if (bodyline.equals("\r\n") || bodyline.equals("")) {
return null;
}
String t = in.nextLine();
while (!t.equals("\r\n") && !t.equals("")) {
bodyline += t + "\r\n";
t = in.nextLine();
}
String[] parameters = bodyline.split("&");
Map<String, String> parameterMap = new HashMap<>();
String[] keyV = {"", ""};
for (String parameter : parameters) {
String[] temp = parameter.split("=");
if (temp.length == 2) {
keyV = temp;
}
if (temp.length == 1) {
keyV[0] = temp[0];
}
parameterMap.put(keyV[0], keyV[1]);
}
return parameterMap;
}
private void doGet(String requestPath, PrintWriter out) {
final String CRLF = "\r\n";
String statusLine = null;
String date = new Date().toString();
String contentTypeLine = "";
String contentLengthLine = "";
String entityBody = "";
File requestFile = new File(requestPath);
Path path = Paths.get(requestPath);
if (requestFile.exists()) {
statusLine = "HTTP/1.0 200 OK";
contentLengthLine = String.valueOf(requestFile.length());
try {
contentTypeLine = Files.probeContentType(path);
List<String> contents = Files.readAllLines(path);
for (String line : contents) {
entityBody += line + CRLF;
}
} catch (IOException e) {
statusLine = "HTTP/1.0 400 BadRequest";
entityBody = "<HTML>400 Not BadRequest</TITLE></HEAD>" +
"<BODY>400 BadRequest" +
e.getMessage();
e.printStackTrace();
}
} else {
statusLine = "HTTP/1.0 404 Not Found";
entityBody = "<HTML>404 Not Found</TITLE></HEAD>" +
"<BODY>404 Not Found";
}
out.print(statusLine + CRLF);
out.print("Date: " + date + CRLF);
out.print("Content-Type: " + contentTypeLine + CRLF);
out.print("Content-Length: " + contentLengthLine + CRLF);
out.print(CRLF);
out.print(entityBody + CRLF);
out.flush();
}
private void doPost(String requestPath, PrintWriter out, Map<String, String> parameterMap) {
final String CRLF = "\r\n";
String statusLine = null;
String date = new Date().toString();
String contentTypeLine = "";
String contentLengthLine = "";
String entityBody = "";
File requestFile = new File(requestPath);
Path path = Paths.get(requestPath);
if (requestFile.exists()) {
statusLine = "HTTP/1.0 200 OK";
try {
PrintWriter fileWrite = new PrintWriter(new FileWriter(requestFile, true));
fileWrite.append(parameterMap.toString());
fileWrite.close();
contentLengthLine = String.valueOf(requestFile.length());
contentTypeLine = Files.probeContentType(path);
List<String> contents = Files.readAllLines(path);
for (String line : contents) {
entityBody += line + CRLF;
}
} catch (IOException e) {
statusLine = "HTTP/1.0 400 BadRequest";
entityBody = "<HTML>400 Not BadRequest</TITLE></HEAD>" +
"<BODY>400 BadRequest" +
e.getMessage();
e.printStackTrace();
}
} else {
statusLine = "HTTP/1.0 404 Not Found";
entityBody = "<HTML>404 Not Found</TITLE></HEAD>" +
"<BODY>404 Not Found";
}
out.print(statusLine + CRLF);
out.print("Date: " + date + CRLF);
out.print("Content-Type: " + contentTypeLine + CRLF);
out.print("Content-Length: " + contentLengthLine + CRLF);
out.print(CRLF);
out.print(entityBody + CRLF);
out.flush();
}
}