简单服务器。

没怎么关注socket这地块..多半是知其然,不知其所以然


闲着无聊..写了一个简单的java服务器,供新人复习.


把类贴到jee工程中 将静态文件放至wwwroot目录 运行main函数即可访问


import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;


/**
 * 基于阻塞 模式的简单的java服务器
 * 
 * @author 衣旧 2010-06-06
 */
public class HttpServer {


/**
* 监听本地端口
*/
private ServerSocket serverSocket;


/**
* 根目录
*/
public static final String WEB_ROOT = System.getProperty("user.dir")+ File.separator + "wwwroot";
/**
* 服务器监听端口, 默认为 80.
*/
public static int PORT = 80;


/**
* 开始服务器 Socket 线程.
*/
public HttpServer() {
try {
serverSocket = new ServerSocket(PORT);
while (true) {
Socket client = serverSocket.accept();
new IoHandler(client);
}
} catch (Exception e) {
System.out.println("无法启动HTTP服务器:" + e.toString());
}
if (serverSocket == null)
System.exit(1);// 无法开始服务器
System.out.println("HTTP 服务器正在运行,端口:" + PORT);
}


/**
* 打印用途说明.
*/
private static void usage() {
System.out
.println("Usage: java serverSocket \nDefault port is 80.");
}


/**
* 启动简易 HTTP 服务器
* 
* @param args
*/
public static void main(String[] args) {
try {
if (args.length != 1) {
usage();
} else if (args.length == 1) {
PORT = Integer.parseInt(args[0]);
}
} catch (Exception ex) {
System.err.println("初始端口. 必须是大于0的整数!\n" + ex.toString());
}
new HttpServer();
}


/**
* 响应http请求
* 
* @author liucf
* 
*/
class IoService {


private IoProcessor request;
private PrintWriter out;
private PrintStream outs;
private int BUFFER_SIZE = 1024;


IoService(PrintWriter output, PrintStream outs) {
this.out = output;
this.outs = outs;
}


public IoProcessor getRequest() {
return request;
}


public void setRequest(IoProcessor request) {
this.request = request;
}


public void responseInfo() {
if ("POST".equalsIgnoreCase(request.getMethod())
&& request.getContentLength() > 0) {
// System.out.println("以下内容为 POST 方式提交的表单数据");
// for (int i = 0; i < request.getContentLength(); i++) {
// try {
// System.out.print((char) request.getIn().read());
// } catch (IOException e) {
// e.printStackTrace();
// }
// }
}


if ("GET".equalsIgnoreCase(request.getMethod())) {
doGet();
}
}


public void doGet() {
File file = new File(HttpServer.WEB_ROOT, request.getUri());
if (file.isDirectory()) {
out.println("HTTP/1.0 200 OK");// 返回应答消息,并结束应答
out.println("Content-Type:text/html;charset=GBK");
out.println();
out.println("

不允许访问文件夹!!

");
} else if (file.exists()) {
byte[] bytes = new byte[BUFFER_SIZE];
FileInputStream fis = null;
if (file.exists()) {
try {
fis = new FileInputStream(file);
int ch = fis.read(bytes, 0, BUFFER_SIZE);
while (ch != -1) {
outs.write(bytes, 0, ch);
ch = fis.read(bytes, 0, BUFFER_SIZE);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
} else {
out.println("HTTP/1.0 404 Not found");// 返回应答消息,并结束应答
out.println("Content-Type:text/html;charset=GBK");
out.println();
out.println("

访问路径不存在!!

");
}
}
}


/**
* 
* 封装处理http请求信息
* 
* @author liucf
* 
*/
class IoProcessor {
private BufferedReader in;
private String uri;
private String method;
private int contentLength;
private Map http = new HashMap();


public IoProcessor(BufferedReader in) {
this.in = in;
parseRequstInfo();
}


private void parseRequstInfo() {
String line = null;
try {
line = in.readLine();
// 读取第一行, 请求地址
System.out.println(line);
String resource = line.substring(line.indexOf('/'), line
.lastIndexOf('/') - 5);
// 获得请求的资源的地址
uri = URLDecoder.decode(resource, "UTF-8");// 反编码
// 地址
method = new StringTokenizer(line).nextElement().toString();// 获取请求方法,


// 读取所有浏览器发送过来的请求参数头部信息
while ((line = in.readLine()) != null) {
if (line.equals(""))
break;
if (line.indexOf(":") != -1) {
String key = line.substring(0, line.indexOf(':'))
.trim();
String value = line.substring(line.indexOf(':') + 1)
.trim();
http.put(key, value);
// 读取 POST 等数据的内容长度
if (line.startsWith("Content-Length")) {
try {
contentLength = Integer.parseInt(line
.substring(line.indexOf(':') + 1)
.trim());
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
} catch (IOException e) {
System.out.println("解析请求出错!");
e.printStackTrace();
}
}


public BufferedReader getIn() {
return in;
}


public void setIn(BufferedReader in) {
this.in = in;
}


public String getUri() {
return uri;
}


public void setUri(String uri) {
this.uri = uri;
}


public String getMethod() {
return method;
}


public void setMethod(String method) {
this.method = method;
}


public int getContentLength() {
return contentLength;
}


public void setContentLength(int contentLength) {
this.contentLength = contentLength;
}


public Map getHttp() {
return http;
}


public void setHttp(Map http) {
this.http = http;
}
}


/**
* 响应客户端请求
* 
* @author liucf
*
*/
class IoHandler implements Runnable {


private Socket client;// 客户端连接


private BufferedReader input;// 接收外部信息的流


private PrintWriter printWriter;// 输出流


private PrintStream printStream;


public IoHandler(Socket socket) {
this.client = socket;
try {
input = new BufferedReader(new InputStreamReader(client
.getInputStream()));
printWriter = new PrintWriter(new OutputStreamWriter(client
.getOutputStream(), "GBK"), true);
printStream = new PrintStream(client.getOutputStream(), true);
} catch (IOException e) {
e.printStackTrace();
}
this.run();
}


public void run() {
System.out.println("连接到服务器的用户:" + client);
try {
IoProcessor request = new IoProcessor(input);
IoService response = new IoService(printWriter, printStream);
response.setRequest(request);
response.responseInfo();
closeSocket(client);
} catch (Exception e) {
System.out.println("HTTP 服务器错误:" + e.toString());
}
}


/**
* 关闭客户端 socket 并打印一条调试信息.
* 
* @param socket
*            客户端 socket.
*/
public void closeSocket(Socket socket) {
try {
printWriter.close();
socket.close();
} catch (IOException ex) {
ex.printStackTrace();
}
System.out.println(socket + "离开了HTTP服务器!\n");
}
}
}