tomcat2章1
package ex02.pyrmont; import java.io.File; public class Constants {
public static final String WEB_ROOT =
System.getProperty("user.dir") + File.separator + "webroot";
}
package ex02.pyrmont; import java.net.Socket;
import java.net.ServerSocket;
import java.net.InetAddress;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException; public class HttpServer1 { private static final String SHUTDOWN_COMMAND = "/SHUTDOWN"; private boolean shutdown = false; public static void main(String[] args) {
HttpServer1 server = new HttpServer1();
server.await();
} 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);
} while (!shutdown) {
Socket socket = null;
InputStream input = null;
OutputStream output = null;
try {
socket = serverSocket.accept();
input = socket.getInputStream();
output = socket.getOutputStream(); Request request = new Request(input);
request.parse(); Response response = new Response(output);
response.setRequest(request); // a request for a servlet begins with "/servlet/"
if (request.getUri().startsWith("/servlet/")) {
ServletProcessor1 processor = new ServletProcessor1();
processor.process(request, response); //根据url后面的参数 找到servlet去处理
}
else {//处理页面等资源
StaticResourceProcessor processor = new StaticResourceProcessor();
processor.process(request, response);
} socket.close();
shutdown = request.getUri().equals(SHUTDOWN_COMMAND);
}
catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
}
}
package ex02.pyrmont; import java.io.InputStream;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.UnsupportedEncodingException;
import java.util.Enumeration;
import java.util.Locale;
import java.util.Map;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletRequest; public class Request implements ServletRequest { private InputStream input;
private String uri; public Request(InputStream input) {
this.input = input;
} public String getUri() {
return uri;
} private String parseUri(String requestString) {
int index1, index2;
index1 = requestString.indexOf(' ');
if (index1 != -1) {
index2 = requestString.indexOf(' ', index1 + 1);
if (index2 > index1)
return requestString.substring(index1 + 1, index2);
}
return null;
} public void parse() {
StringBuffer request = new StringBuffer(2048);
int i;
byte[] buffer = new byte[2048];
try {
i = input.read(buffer);
}
catch (IOException e) {
e.printStackTrace();
i = -1;
}
for (int j=0; j<i; j++) {
request.append((char) buffer[j]);
}
System.out.print(request.toString());
uri = parseUri(request.toString());
} /* implementation of the ServletRequest*/
public Object getAttribute(String attribute) {
return null;
} public Enumeration getAttributeNames() {
return null;
} public String getRealPath(String path) {
return null;
} public RequestDispatcher getRequestDispatcher(String path) {
return null;
} public boolean isSecure() {
return false;
} public String getCharacterEncoding() {
return null;
} public int getContentLength() {
return 0;
} public String getContentType() {
return null;
} public ServletInputStream getInputStream() throws IOException {
return null;
} public Locale getLocale() {
return null;
} public Enumeration getLocales() {
return null;
} public String getParameter(String name) {
return null;
} public Map getParameterMap() {
return null;
} public Enumeration getParameterNames() {
return null;
} public String[] getParameterValues(String parameter) {
return null;
} public String getProtocol() {
return null;
} public BufferedReader getReader() throws IOException {
return null;
} public String getRemoteAddr() {
return null;
} public String getRemoteHost() {
return null;
} public String getScheme() {
return null;
} public String getServerName() {
return null;
} public int getServerPort() {
return 0;
} public void removeAttribute(String attribute) {
} public void setAttribute(String key, Object value) {
} public void setCharacterEncoding(String encoding)
throws UnsupportedEncodingException {
} }
package ex02.pyrmont; import java.io.OutputStream;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.File;
import java.io.PrintWriter;
import java.util.Locale;
import javax.servlet.ServletResponse;
import javax.servlet.ServletOutputStream; public class Response implements ServletResponse { private static final int BUFFER_SIZE = 1024;
Request request;
OutputStream output;
PrintWriter writer; public Response(OutputStream output) {
this.output = output;
} public void setRequest(Request request) {
this.request = request;
} public void sendStaticResource() throws IOException {
byte[] bytes = new byte[BUFFER_SIZE];
FileInputStream fis = null;
try {
/* request.getUri has been replaced by request.getRequestURI */
File file = new File(Constants.WEB_ROOT, request.getUri());
fis = new FileInputStream(file);
/*
HTTP Response = Status-Line
*(( general-header | response-header | entity-header ) CRLF)
CRLF
[ message-body ]
Status-Line = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
*/
int ch = fis.read(bytes, 0, BUFFER_SIZE);
while (ch!=-1) {
output.write(bytes, 0, ch);
ch = fis.read(bytes, 0, BUFFER_SIZE);
}
}
catch (FileNotFoundException e) {
String errorMessage = "HTTP/1.1 404 File Not Found\r\n" +
"Content-Type: text/html\r\n" +
"Content-Length: 23\r\n" +
"\r\n" +
"<h1>File Not Found</h1>";
output.write(errorMessage.getBytes());
}
finally {
if (fis!=null)
fis.close();
}
} /** implementation of ServletResponse */
public void flushBuffer() throws IOException {
} public int getBufferSize() {
return 0;
} public String getCharacterEncoding() {
return null;
} public Locale getLocale() {
return null;
} public ServletOutputStream getOutputStream() throws IOException {
return null;
} public PrintWriter getWriter() throws IOException {
// autoflush is true, println() will flush,
// but print() will not.
writer = new PrintWriter(output, true);
return writer;
} public boolean isCommitted() {
return false;
} public void reset() {
} public void resetBuffer() {
} public void setBufferSize(int size) {
} public void setContentLength(int length) {
} public void setContentType(String type) {
} public void setLocale(Locale locale) {
}
}
package ex02.pyrmont; import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLStreamHandler;
import java.io.File;
import java.io.IOException;
import javax.servlet.Servlet;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse; public class ServletProcessor1 { public void process(Request request, Response response) { String uri = request.getUri();
String servletName = uri.substring(uri.lastIndexOf("/") + 1);
URLClassLoader loader = null; try {
URL[] urls = new URL[1];
URLStreamHandler streamHandler = null;
File classPath = new File(Constants.WEB_ROOT);
String repository = (new URL("file", null, classPath.getCanonicalPath() + File.separator)).toString() ;
urls[0] = new URL(null, repository, streamHandler);
loader = new URLClassLoader(urls);
}
catch (IOException e) {
System.out.println(e.toString() );
}
Class myClass = null;
try {
myClass = loader.loadClass(servletName);
}
catch (ClassNotFoundException e) {
System.out.println(e.toString());
} Servlet servlet = null; try {
servlet = (Servlet) myClass.newInstance();
servlet.service((ServletRequest) request, (ServletResponse) response);
}
catch (Exception e) {
System.out.println(e.toString());
}
catch (Throwable e) {
System.out.println(e.toString());
} }
}
package ex02.pyrmont; import java.io.IOException; public class StaticResourceProcessor { public void process(Request request, Response response) {
try {
response.sendStaticResource();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
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