我获得了代码，我必须做其他事情。当我去编译我的servlet时，它不会识别我的bean。我已经删除，重新编译，并尝试从所有不同的目录。我不知道为什么这不起作用。
floatAccountBean.java
import BH.*;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.util.function.*;
import static java.util.Arrays.asList;
import java.text.DateFormat;
import java.util.concurrent.locks.ReentrantLock;
import java.util.Random;
public class sessionServlet extends HttpServlet {
private List<String[]> the_sessions;
private DateFormat df;
public static ReentrantLock thelock = new ReentrantLock();
public void init() throws ServletException {
the_sessions=new ArrayList<String[]>();
df=DateFormat.getDateTimeInstance(DateFormat.LONG,DateFormat.LONG);
}
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
if ((!(req.getParameter("task")==null))&&(req.getParameter("task").trim().equals("deploy"))) {
PrintWriter out = res.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<hr /><center><h1>sessionServlet Deployed</h1></center><hr />");
out.println("</body>");
out.println("</html>");
return;
}
Consumer <String> forwardTo =(s) ->ForwardTo(s,req,res);
boolean is_first_visit=true;
String[] this_session=new String[3];
String manager = req.getParameter("manager");
for (String [] a_session :the_sessions) {
if (a_session[0].equals(manager)) { //Found an active session
is_first_visit=false;
this_session=a_session;
break;
}
}
if ((req.getParameter("task")==null)&&(!is_first_visit)) {
the_sessions.remove(this_session);
is_first_visit=true; // just used http://hoare.cs.umsl.edu/servlet/js_test/sessionServlet
}
req.setAttribute("thesessioncount",the_sessions.size());
if (is_first_visit) {
if (the_sessions.size()==10) {
forwardTo.accept("noSessions.jsp"); //No Available Sessions
return;
}
String randomStr = getRandomString();
String[] new_session = {randomStr,df.format(new Date()),"need a name"};
the_sessions.add(new_session);
this_session=new_session;
req.setAttribute("manager",randomStr);
forwardTo.accept("startSession.jsp");
return;
}
String the_name="";
String the_pw="";
if (this_session[2].equals("need a name")) { //No name given yet
the_name=req.getParameter("whoisit");
the_pw=req.getParameter("passwd");
if ((the_name==null)||(the_name.trim().length()==0)||checkPW(the_name,the_pw)) { //checkPW returns false if correct
the_sessions.remove(this_session);
req.setAttribute("thesessioncount",the_sessions.size());
forwardTo.accept("startSession.jsp");
return; // didn't enter a name in startSession
}
}
this_session[2]=the_name.trim();
req.setAttribute("thename", this_session[2]);
if (tooLong(this_session[1],df.format(new Date()))) { //Has the session timed out?
the_sessions.remove(this_session);
forwardTo.accept("Expired.jsp");
return;
} else {
this_session[1]=df.format(new Date()); //reset the last session activity time
NotesBean thesenotes=new NotesBean();
if(req.getParameter("task").trim().equals("9")){
the_sessions.remove(this_session);
forwardTo.accept("exit.jsp");
return;
}
thelock.lock();
if (!req.getParameter("task").trim().equals("0")) { //add ACC here, also show/update posts
thesenotes.setAll(req.getParameter("java_source"),Integer.parseInt(req.getParameter("version")));
if (req.getParameter("task").trim().equals("2")) {
thesenotes.setNotes(req.getParameter("notes"),req.getParameter("java_source"),Integer.parseInt(req.getParameter("version")));
}
}
req.setAttribute("thesessioncount",the_sessions.size());
req.setAttribute("theBean",thesenotes);
req.setAttribute("manager",manager);
//req.setAttribute("theURL", "http://www.umsl.edu/~siegelj/turing.jpg");
forwardTo.accept("getNotes.jsp");
thelock.unlock();
return;
}
}//end doGet
boolean tooLong(String now,String then){
//Check amount of time that passed
return false;
}
boolean checkPW(String name,String password){
AccountBean theAccount = new AccountBean();
theAccount.setAccount(name);
if(theAccount.isPassword(password))
return false;
return true;
}
public void log(String s){
FileWriter fileWriter = null;
try {
String content =s+" at :"+new Date(System.currentTimeMillis()).toString()+"\n";
File theLogFile = new File("C:/Tomcat/webapps/js_test/session.log");
fileWriter = new FileWriter(theLogFile,true);
fileWriter.write(content);
} catch (IOException ex) {
} finally {
try {
fileWriter.close();
} catch (IOException ex) {
}
}
}
void ForwardTo(String s,HttpServletRequest req, HttpServletResponse res)
{
RequestDispatcher rd= req.getRequestDispatcher(s);
try {
rd.forward(req, res);
} catch (IOException|ServletException is) {
log(" req from "+s+" not forwarded at ");
try {
throw is;
} catch (Exception e) {
}
}
}
public void destroy()
{
log("The instance was destroyed");
}
public String getRandomString(){
byte[] randbyte=new byte[10];
Random rand = new Random(System.currentTimeMillis());
for (int idx = 0; idx <10; ++idx) {
int randomInt = rand.nextInt(26); //0<=randomInt<26
//System.out.println(randomInt);
randbyte[idx]=(byte)(randomInt+65);
}
try {
String rs=new String(randbyte, "UTF-8");
//System.out.println(rs);
return rs;
} catch (Exception e) {
//System.out.println("bad string");
return "bad";
}
}
}
答案 0 :(得分：0)
添加此语句import mybeans.*;，因为您使用的是AccountBean但未导入该类包;
import BH.*;
import mybeans.*;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.util.function.*;
import static java.util.Arrays.asList;
import java.text.DateFormat;
import java.util.concurrent.locks.ReentrantLock;
import java.util.Random;
public class sessionServlet extends HttpServlet {
private List<String[]> the_sessions;
private DateFormat df;
public static ReentrantLock thelock = new ReentrantLock();
public void init() throws ServletException {
the_sessions=new ArrayList<String[]>();
df=DateFormat.getDateTimeInstance(DateFormat.LONG,DateFormat.LONG);
}
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
if ((!(req.getParameter("task")==null))&&(req.getParameter("task").trim().equals("deploy"))) {
PrintWriter out = res.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<hr /><center><h1>sessionServlet Deployed</h1></center><hr />");
out.println("</body>");
out.println("</html>");
return;
}
Consumer <String> forwardTo =(s) ->ForwardTo(s,req,res);
boolean is_first_visit=true;
String[] this_session=new String[3];
String manager = req.getParameter("manager");
for (String [] a_session :the_sessions) {
if (a_session[0].equals(manager)) { //Found an active session
is_first_visit=false;
this_session=a_session;
break;
}
}
if ((req.getParameter("task")==null)&&(!is_first_visit)) {
the_sessions.remove(this_session);
is_first_visit=true; // just used http://hoare.cs.umsl.edu/servlet/js_test/sessionServlet
}
req.setAttribute("thesessioncount",the_sessions.size());
if (is_first_visit) {
if (the_sessions.size()==10) {
forwardTo.accept("noSessions.jsp"); //No Available Sessions
return;
}
String randomStr = getRandomString();
String[] new_session = {randomStr,df.format(new Date()),"need a name"};
the_sessions.add(new_session);
this_session=new_session;
req.setAttribute("manager",randomStr);
forwardTo.accept("startSession.jsp");
return;
}
String the_name="";
String the_pw="";
if (this_session[2].equals("need a name")) { //No name given yet
the_name=req.getParameter("whoisit");
the_pw=req.getParameter("passwd");
if ((the_name==null)||(the_name.trim().length()==0)||checkPW(the_name,the_pw)) { //checkPW returns false if correct
the_sessions.remove(this_session);
req.setAttribute("thesessioncount",the_sessions.size());
forwardTo.accept("startSession.jsp");
return; // didn't enter a name in startSession
}
}
this_session[2]=the_name.trim();
req.setAttribute("thename", this_session[2]);
if (tooLong(this_session[1],df.format(new Date()))) { //Has the session timed out?
the_sessions.remove(this_session);
forwardTo.accept("Expired.jsp");
return;
} else {
this_session[1]=df.format(new Date()); //reset the last session activity time
NotesBean thesenotes=new NotesBean();
if(req.getParameter("task").trim().equals("9")){
the_sessions.remove(this_session);
forwardTo.accept("exit.jsp");
return;
}
thelock.lock();
if (!req.getParameter("task").trim().equals("0")) { //add ACC here, also show/update posts
thesenotes.setAll(req.getParameter("java_source"),Integer.parseInt(req.getParameter("version")));
if (req.getParameter("task").trim().equals("2")) {
thesenotes.setNotes(req.getParameter("notes"),req.getParameter("java_source"),Integer.parseInt(req.getParameter("version")));
}
}
req.setAttribute("thesessioncount",the_sessions.size());
req.setAttribute("theBean",thesenotes);
req.setAttribute("manager",manager);
//req.setAttribute("theURL", "http://www.umsl.edu/~siegelj/turing.jpg");
forwardTo.accept("getNotes.jsp");
thelock.unlock();
return;
}
}//end doGet
boolean tooLong(String now,String then){
//Check amount of time that passed
return false;
}
boolean checkPW(String name,String password){
AccountBean theAccount = new AccountBean();
theAccount.setAccount(name);
if(theAccount.isPassword(password))
return false;
return true;
}
public void log(String s){
FileWriter fileWriter = null;
try {
String content =s+" at :"+new Date(System.currentTimeMillis()).toString()+"\n";
File theLogFile = new File("C:/Tomcat/webapps/js_test/session.log");
fileWriter = new FileWriter(theLogFile,true);
fileWriter.write(content);
} catch (IOException ex) {
} finally {
try {
fileWriter.close();
} catch (IOException ex) {
}
}
}
void ForwardTo(String s,HttpServletRequest req, HttpServletResponse res)
{
RequestDispatcher rd= req.getRequestDispatcher(s);
try {
rd.forward(req, res);
} catch (IOException|ServletException is) {
log(" req from "+s+" not forwarded at ");
try {
throw is;
} catch (Exception e) {
}
}
}
public void destroy()
{
log("The instance was destroyed");
}
public String getRandomString(){
byte[] randbyte=new byte[10];
Random rand = new Random(System.currentTimeMillis());
for (int idx = 0; idx <10; ++idx) {
int randomInt = rand.nextInt(26); //0<=randomInt<26
//System.out.println(randomInt);
randbyte[idx]=(byte)(randomInt+65);
}
try {
String rs=new String(randbyte, "UTF-8");
//System.out.println(rs);
return rs;
} catch (Exception e) {
//System.out.println("bad string");
return "bad";
}
}
}