Servlet容器工作原理（二）

Listing 2.2. HttpServer1 类的 await 方法
public void await() {
ServerSocket serverSocket = null;
int       port  = 8080;

try {
serverSocket =  new ServerSocket(port, 1,
InetAddress.getByName("127.0.0.1"));
    }
catch (IOException e) {
e.printStackTrace();
System.exit(1);
    }

// 循环，等待一个请求
while (!shutdown) {
Socket socket       = null;
InputStream input   = null;
OutputStream output = null;

try {
socket = serverSocket.accept();
input  = socket.getInputStream();
output = socket.getOutputStream();

// 创建请求对象并解析
Request request = new Request(input);
request.parse();

// 创建回应对象
Response response = new Response(output);
response.setRequest(request);

//检测是否是 servlet 或静态资源的请求
//servlet 请求以 "/servlet/" 开始 
if (request.getUri().startsWith("/servlet/")) {
ServletProcessor1 processor = new ServletProcessor1();
processor.process(request, response);
            }
else {
StaticResourceProcessor processor =
new StaticResourceProcessor();
processor.process(request, response);
            }

// 关闭socket
socket.close();

//检测是否前面的 URI 是一个 shutdown 命令
shutdown = request.getUri().equals(SHUTDOWN_COMMAND);
        }
catch (Exception e) {
e.printStackTrace();
System.exit(1);
        }
    }
}

public Object getAttribute(String attribute) {
return null;
  }

public Enumeration getAttributeNames() {
return null;
  }

public String getRealPath(String path) {
return null;
  }

public PrintWriter getWriter() {
// autoflush is true, println() will flush,
// but print() will not.
writer = new PrintWriter(output, true);
return writer;

}

Listing 2.3.StaticResourceProcessor 类的 process方法。
public void process(Request request, Response response) {
try {
response.sendStaticResource();
    }
catch (IOException e) {
e.printStackTrace();
    }
}

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