servlet源代码

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov. // Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html // Decompiler options: packimports(3) fieldsfirst ansi // Source File Name: HttpServlet.java package javax.servlet.http; import java.io.IOException; import java.io.Serializable; import java.lang.reflect.Method; import java.text.MessageFormat; import java.util.Enumeration; import java.util.ResourceBundle; import javax.servlet.*; // Referenced classes of package javax.servlet.http: // NoBodyResponse, HttpServletRequest, HttpServletResponse public abstract class HttpServlet extends GenericServlet implements Serializable { private static final String METHOD_DELETE = "DELETE"; private static final String METHOD_HEAD = "HEAD"; private static final String METHOD_GET = "GET"; private static final String METHOD_OPTIONS = "OPTIONS"; private static final String METHOD_POST = "POST"; private static final String METHOD_PUT = "PUT"; private static final String METHOD_TRACE = "TRACE"; private static final String HEADER_IFMODSINCE = "If-Modified-Since"; private static final String HEADER_LASTMOD = "Last-Modified"; private static final String LSTRING_FILE = "javax.servlet.http.LocalStrings"; private static ResourceBundle lStrings = ResourceBundle.getBundle("javax.servlet.http.LocalStrings"); public HttpServlet() { } protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String protocol = req.getProtocol(); String msg = lStrings.getString("http.method_get_not_supported"); if(protocol.endsWith("1.1")) resp.sendError(405, msg); else resp.sendError(400, msg); } protected long getLastModified(HttpServletRequest req) { return -1L; } protected void doHead(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { NoBodyResponse response = new NoBodyResponse(resp); doGet(req, response); response.setContentLength(); } protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String protocol = req.getProtocol(); String msg = lStrings.getString("http.method_post_not_supported"); if(protocol.endsWith("1.1")) resp.sendError(405, msg); else resp.sendError(400, msg); } protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String protocol = req.getProtocol(); String msg = lStrings.getString("http.method_put_not_supported"); if(protocol.endsWith("1.1")) resp.sendError(405, msg); else resp.sendError(400, msg); } protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String protocol = req.getProtocol(); String msg = lStrings.getString("http.method_delete_not_supported"); if(protocol.endsWith("1.1")) resp.sendError(405, msg); else resp.sendError(400, msg); } private Method[] getAllDeclaredMethods(Class c) { if(c.getName().equals("javax.servlet.http.HttpServlet")) return null; int j = 0; Method parentMethods[] = getAllDeclaredMethods(c.getSuperclass()); Method thisMethods[] = c.getDeclaredMethods(); if(parentMethods != null) { Method allMethods[] = new Method[parentMethods.length + thisMethods.length]; for(int i = 0; i < parentMethods.length; i++) { allMethods[i] = parentMethods[i]; j = i; } for(int i = ++j; i < thisMethods.length + j; i++) allMethods[i] = thisMethods[i - j]; return allMethods; } else { return thisMethods; } } protected void doOptions(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { Method methods[] = getAllDeclaredMethods(getClass()); boolean ALLOW_GET = false; boolean ALLOW_HEAD = false; boolean ALLOW_POST = false; boolean ALLOW_PUT = false; boolean ALLOW_DELETE = false; boolean ALLOW_TRACE = true; boolean ALLOW_OPTIONS = true; for(int i = 0; i < methods.length; i++) { Method m = methods[i]; if(m.getName().equals("doGet")) { ALLOW_GET = true; ALLOW_HEAD = true; } if(m.getName().equals("doPost")) ALLOW_POST = true; if(m.getName().equals("doPut")) ALLOW_PUT = true; if(m.getName().equals("doDelete")) ALLOW_DELETE = true; } String allow = null; if(ALLOW_GET && allow == null) allow = "GET"; if(ALLOW_HEAD) if(allow == null) allow = "HEAD"; else allow = allow + ", HEAD"; if(ALLOW_POST) if(allow == null) allow = "POST"; else allow = allow + ", POST"; if(ALLOW_PUT) if(allow == null) allow = "PUT"; else allow = allow + ", PUT"; if(ALLOW_DELETE) if(allow == null) allow = "DELETE"; else allow = allow + ", DELETE"; if(ALLOW_TRACE) if(allow == null) allow = "TRACE"; else allow = allow + ", TRACE"; if(ALLOW_OPTIONS) if(allow == null) allow = "OPTIONS"; else allow = allow + ", OPTIONS"; resp.setHeader("Allow", allow); } protected void doTrace(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String CRLF = "\r\n"; String responseString = "TRACE " + req.getRequestURI() + " " + req.getProtocol(); for(Enumeration reqHeaderEnum = req.getHeaderNames(); reqHeaderEnum.hasMoreElements();) { String headerName = (String)reqHeaderEnum.nextElement(); responseString = responseString + CRLF + headerName + ": " + req.getHeader(headerName); } responseString = responseString + CRLF; int responseLength = responseString.length(); resp.setContentType("message/http"); resp.setContentLength(responseLength); ServletOutputStream out = resp.getOutputStream(); out.print(responseString); out.close(); } protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String method = req.getMethod(); if(method.equals("GET")) { long lastModified = getLastModified(req); if(lastModified == -1L) { doGet(req, resp); } else { long ifModifiedSince = req.getDateHeader("If-Modified-Since"); if(ifModifiedSince < (lastModified / 1000L) * 1000L) { maybeSetLastModified(resp, lastModified); doGet(req, resp); } else { resp.setStatus(304); } } } else if(method.equals("HEAD")) { long lastMo