Servlet. 1.1 Web. 1.2 Servlet. HTML CGI Common Gateway Interface Web CGI CGI. Java Applet JavaScript Web. Java CGI Servlet. Java. Apache Tomcat Jetty
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1 1 Servlet 1.1 Web Web WWW HTML CGI Common Gateway Interface Web HTML Web Web CGI CGI CGI Perl, PHP C Java Applet JavaScript Web CGI HTML 1.2 Servlet Java Servlet Servlet CGI Web CGI 1 Java Java JVM Java CGI Servlet Web Servlet Servlet Web Web Web Apache Web Servlet JSP Web Apache Tomcat Jetty 1 Web CGI Servlet Web CGI II 1 p.1
2 Apache Tomcat, Jetty Java JDK, Eclipse HTML Apache Tomcat Jetty Java if else for while C class extends C. new import C #include if, else, for, while, class, extends,., new, import Java API : Java Platform, Standard Edition 6 Java API (J2SEAPI) Java Platform, Enterprise Edition, v 5.0 Servlet API DISCLAIMER: Servlet Web Servlet Java API 1.4 Servlet CGI Servlet HTML 2 2 JPEG PNG HTML CGI Servlet HTML II 1 p.2
3 Servlet MyDate.java import java.io.ioexception; import java.io.printwriter; import java.util.calendar; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; public class MyDate extends HttpServlet { String[] youbi = {" ", " ", " ", " ", " ", " ", " public void doget(httpservletrequest request, HttpServletResponse response) throws IOException { response.setcontenttype("text/html; charset=windows-31j"); PrintWriter out = response.getwriter(); out.println("<html><head></head><body>"); Calendar cal = Calendar.getInstance(); out.printf("%d %d %d %s %d %d %d %n", cal.get(calendar.year), cal.get(calendar.month)+1, cal.get(calendar.day_of_month), youbi[cal.get(calendar.day_of_week)-1], cal.get(calendar.hour_of_day), cal.get(calendar.minute), cal.get(calendar.second)); out.println("</body></html>"); out.close(); Servlet HttpServlet Servlet Servlet import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import Servlet javax.servlet javax.servlet.http Servlet doget dopost : public void doget(httpservletrequest request, HttpServletResponse response) throws IOException doget/dopost HttpServletRequest HttpServletResponse 2 (request) (response) throws IOException doget IOException Java II 1 p.3
4 response.setcontenttype("text/html; charset=windows-31j"); HTML Windows-31J PrintWriter out = response.getwriter(); out printf println, print PrintWriter printf C printf %d %s C printf %n Unix Y=n Windows Y=rY=n Java printf println print %d %s println print out.close() Servlet : Calendar (J2SEAPI)/java/util/Calendar.html HTML <font color= red >... </font> HTML red " Java C " out.println("<font color=y="redy=">") " Y= : HTML <body background=... >... </body> : Servlet Servlet Eclipse WTP Eclipse Servlet.class javac -classpath servlet-api.jar MyDate.java II 1 p.4
5 servlet-api.jar ServletAPI JAR Java Web Servlet MyDate.java MyDate.class Servlet : - Web - WEB-INF - web.xml - classes - class - lib - JAR classes web.xml web.xml : <web-app>... <servlet> <servlet-name>mydate</servlet-name> <servlet-class>mydate</servlet-class> </servlet> <servlet-mapping> <servlet-name>mydate</servlet-name> <url-pattern>/mydate</url-pattern> </servlet-mapping>... </web-app> MyDate MyDate MyDate /MyDate URL Web Web JavaEnterpriseAP Web JavaEnterpriseAP WEB-INF URL MyDate hostname Web IP Servlet WWW hostname localhost Servlet II 1 p.5
6 Java API Servlet 1.7 Web Servlet Counter.java import java.io.bufferedreader; import java.io.file; import java.io.filenotfoundexception; import java.io.filereader; import java.io.filewriter; import java.io.ioexception; import java.io.printwriter; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; public class Counter extends HttpServlet public void doget(httpservletrequest request, HttpServletResponse response) throws IOException { int i; response.setcontenttype("text/html; charset=windows-31j"); PrintWriter out = response.getwriter(); out.println("<html><head></head><body>"); File f = new File(getServletContext().getRealPath("/WEB-INF/counter.txt")); try { BufferedReader fin = new BufferedReader(new FileReader(f)); i = Integer.parseInt(fin.readLine()); fin.close(); // close catch (FileNotFoundException e) { i = 0; // 0 catch (NullPointerException e) { i = 0; // 0 catch (NumberFormatException e) { i = 0; // 0 PrintWriter fout = new PrintWriter(new FileWriter(f)); fout.println(++i); fout.close(); // close out.printf(" %d %n", i); out.println("</body></html>"); out.close(); // close II 1 p.6
7 counter.txt Web WEB-INF counter.txt 1 getservletcontext().getrealpath(... ) WEB getservletcontext HttpServlet getrealpath SevletContext Java API HttpServlet javax/servlet/http/httpservlet.html File f = new File(path); BufferedReader fin = new BufferedReader(new FileReader(f ));... fin.close(); FileReader BufferedReader FileReader BufferedReader API... fin System.in close() Integer.parseInt Java String int C atoi PrintWriter fout = new PrintWriter(new FileWriter(f ));... fout.close(); FileWriter PrintWriter FileWriter PrintWriter API fout System.out print println 1.8 Java Counter.java try catch Java try catch II 1 p.7
8 try { 0 catch ( 1 1 ) { 1... catch ( n n ) { n k k=1 n k k k=1 n try catch try catch finally { finally finally counter.txt FileNotFoundException catch C % images 1.png, 2.png CGI 1, 2, <img src=../images/1.png >, <img src=../images/2.png > : Digit Mania Servlet Web 2 Servlet II 1 p.8
9 Counter0.java import java.io.ioexception; import java.io.printwriter; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; public class Counter0 extends HttpServlet { int i=0; public void doget(httpservletrequest request, HttpServletResponse response) throws IOException { response.setcontenttype("text/html; charset=windows-31j"); PrintWriter out = response.getwriter(); out.println("<html><head></head><body>"); out.printf(" %d %n", i++); out.println("</body></html>"); out.close(); // close Web 0 Web HttpServlet Web Counter0 1.9 Servlet II 1 p.9
10 DirIndex.java import java.io.file; import java.io.ioexception; import java.io.printwriter; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; public class DirIndex extends HttpServlet public void doget(httpservletrequest request, HttpServletResponse response) throws IOException { response.setcontenttype("text/html; charset=windows-31j"); PrintWriter out = response.getwriter(); String path = getservletcontext().getrealpath("/"); // File dir = new File(path); String[] files = dir.list(); // dir out.println("<html><head></head><body>"); out.println("<pre>"); int i; out.printf("%s %n%n", path); for (i=0; i<files.length; i++) { out.println(files[i]); // files out.println("</pre>"); out.println("</body></html>"); out.close(); File list String length DirIndex.java 3 NEW! old.txt 4 new.txt 1 DirIndex HTML <html><head><title> </title></head><body><ul> <li>new.txt NEW!</li> <li>old.txt</li> </ul></body></html> : java.io.file lastmodified java.util.calendar gettimeinmillis : HttpServlet, doget, throws, getservletcontext, getrealpath, File, FileReader, BufferedReader, FileWriter, PrinterWriter,, try catch, length II 1 p.10
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