我编写了以下代码块，它获取一个纯文本文件，如果文件的当前修改日期大于循环的最后一次迭代，则将该文件解析为 HTML 版本并将其上传到 ftp服务器。我相信这个问题与作者有关，但我不明白这里发生了什么。循环的第一次迭代似乎执行得很好，然后它 hibernate 了 5 分钟并抛出以下错误:
java.io.IOException: Stream closed
at java.io.BufferedWriter.ensureOpen(BufferedWriter.java:116)
at java.io.BufferedWriter.write(BufferedWriter.java:221)
at java.io.Writer.write(Writer.java:157)
at java.io.Writer.append(Writer.java:227)
at PrintOutConvosFtp3.main(PrintOutConvosFtp3.java:130)
这是引发错误的代码:
import java.io.*;
import java.util.*;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import java.sql.Timestamp;
public class PrintOutConvosFtp3
{
public static void main(String[] args) throws IOException, InterruptedException
{
boolean infiniteLoop = true;
long currentLoopModified = 0;
long lastLoopModified = 0;
while (infiniteLoop)
{
currentLoopModified = new File("C:/Documents and Settings/Cuckoo/Desktop/Syss-convos.LOG").lastModified();
if (currentLoopModified > lastLoopModified)
{
//Read in the conversation log
BufferedReader reader = new BufferedReader(new FileReader("C:/Documents and Settings/Cuckoo/Desktop/Syss-convos.LOG"));
FileWriter output = new FileWriter("C:/Documents and Settings/Cuckoo/Desktop/Conversations.html");
List<String> lines = new ArrayList<String>();
String line = null;
while ((line = reader.readLine()) != null)
//Remove some unnecessary clutter from the log
{
if (!(line.contains("just hung up!!!") || line.contains("just left the Realm.")
|| line.contains("Hurry, I've many esoteric secrets to divulge, and welcome to BaDbOy's realm.")
|| line.contains("For custom MegaMud paths and additional information, check out the website:")
|| line.contains("Syss gossips: Discuss new ideas/issues & see the most up to date information on Facebook!")
|| line.contains("Syss gossips: http://www.facebook.com/groups/EsotericEdits/")
|| line.contains("Syss gossips: MME Dats, Megamud path files and quest walkthroughs are available at my site")
|| line.contains("Syss gossips: www.esoteric-edits.fhero.net")
|| line.contains("telepaths: @")
|| line.contains("I'm a bot. Try telepathing me with @commands.")
|| line.contains("Syss gossips: Remember, you can telepath me @commands for useful things like adding lives.")
|| line.contains("Syss gossips: Bring a friend, help keep mud alive!")
|| line.contains("You say \"http://esoteric-edits.fhero.net/\"")
|| line.contains("For a list of available commands, you can telepath me with @commands.")))
{
//Make the dates american style
String day = line.substring(0,2);
String month = line.substring(3,5);
lines.add(month + "/" + day + line.substring(5));
}
}
//initialize the output file with HTML header
output.write("<html>");
output.write(System.getProperty("line.separator") + "\t<head>");
output.write(System.getProperty("line.separator") + "\t\t<link type=\"text/css\" rel=\"stylesheet\" href=\"stylesheet.css\"/>");
output.write(System.getProperty("line.separator") + "\t\t<title>Esoteric Edits BBS - Conversation Log</title>");
output.write(System.getProperty("line.separator") + "\t</head>");
output.write(System.getProperty("line.separator") + "\t<body>"+ System.getProperty("line.separator") + System.getProperty("line.separator"));
output.write(System.getProperty("line.separator") + "<div id='cssmenu'>");
output.write(System.getProperty("line.separator") + "\t\t<center><img src=\"logo_10_2.png\">");
output.write(System.getProperty("line.separator") + "<ul>");
output.write(System.getProperty("line.separator") + "\t<li> <a href='index.html'><span>Home</span></a></li>");
output.write(System.getProperty("line.separator") + "\t<li> <a href='downloads.html'><span>Downloads</span></a></li>");
output.write(System.getProperty("line.separator") + "\t<li> <a href='Quests.html'><span>Quest Walkthroughs</span></a></li>");
output.write(System.getProperty("line.separator") + "\t<li> <a href='https://www.facebook.com/groups/EsotericEdits/'><span>Facebook</span></a></li>");
output.write(System.getProperty("line.separator") + "\t<li> <a href='captures.html'><span>Captures</span></a></li>");
output.write(System.getProperty("line.separator") + "\t<li class='last'> <a href='FAQs.html'><span>FAQs</span></a></li>");
output.write(System.getProperty("line.separator") + "</ul></center>");
output.write(System.getProperty("line.separator") + "</div><div id='mainpage'>");
output.write(System.getProperty("line.separator") + "<center><img src=\"divider.png\"></center>");
//write out a new file with HTML coloration
for (ListIterator<String> iter = lines.listIterator(); iter.hasNext(); )
{
String currentline = iter.next();
output.write("<b>"); //make everything bold
if (currentline.contains("gangpaths: "))
{
output.write(System.getProperty("line.separator") + "<font color=\"#808000\">" + currentline + "<br></font>");
}
else if (currentline.contains("gossips: ") || currentline.contains("auctions: "))
{
output.write(System.getProperty("line.separator") + "<font color=\"#FF00FF\">" + currentline + "<br></font>");
}
else if (currentline.contains("Broadcast from "))
{
output.write(System.getProperty("line.separator") + "<font color=\"yellow\">" + currentline + "<br></font>");
}
else if (currentline.contains("says \"") || currentline.contains("greets you.") || currentline.contains("bows deeply.")
|| currentline.contains("breaks into a wide grin.") || currentline.contains("You say \"")
|| currentline.contains("nods affirmatively.") || currentline.contains("grin slyly"))
{
output.write(System.getProperty("line.separator") + "<font color=\"green\">" + currentline + "<br></font>");
}
else
{
output.write(System.getProperty("line.separator") + currentline + "<br>");
}
}
//finalize the HTML footer
output.write(System.getProperty("line.separator") + "</b>");
output.write(System.getProperty("line.separator") + "</div>");
output.write(System.getProperty("line.separator") + "</body>");
output.write(System.getProperty("line.separator") + "\t</html>");
output.close(); //file is finalized locally
//define variables for FTP process
String server = "servername";
int port = 21;
String user = "fake";
String pass = "password";
//begin FTP process to web server
FTPClient ftpClient = new FTPClient();
FileInputStream fis = null;
try {
File localFile = new File("C:/Documents and Settings/Cuckoo/Desktop/Conversations.html");
ftpClient.connect(server, port);
ftpClient.login(user, pass);
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
fis = new FileInputStream(localFile);
String remoteFile = "/public_html/Conversations.html";
ftpClient.storeFile(remoteFile, fis);
java.util.Date currentDate = new java.util.Date();
Timestamp ftpTimestamp = new Timestamp(currentDate.getTime());
//Create writer file to log iterations of the loop as successful or skipped.
Writer writer = new BufferedWriter(new FileWriter("C:/Documents and Settings/Cuckoo/Desktop/Convo-Upload.log", true));
writer.append("Successfully uploaded file as of " + ftpTimestamp.toString() + System.getProperty("line.separator"));
writer.close(); //close the iteration logger
ftpClient.logout();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fis != null) {
fis.close();
}
ftpClient.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
lastLoopModified = currentLoopModified; //set the timestamp for the lastmodified on the file being read in
Thread.sleep(300000); //5 minutes
}
else
{
java.util.Date currDate = new java.util.Date();
Timestamp currTimestamp = new Timestamp(currDate.getTime());
//Create writer file to log iterations of the loop as successful or skipped.
Writer writer = new BufferedWriter(new FileWriter("C:/Documents and Settings/Cuckoo/Desktop/Convo-Upload.log", true));
writer.append("Did not detect any new content in file. Did not upload as of " + currTimestamp.toString() + System.getProperty("line.separator"));
writer.close(); //close the iteration logger
}
}
}
}
我认为这与作者被关闭有关，但我尝试移动它，让它保持打开状态，直到无限循环完成(这是永远不会)，等等，我仍然遇到奇怪的行为。我是不是做错了什么？
最佳答案
我在我的机器上运行了代码，并且运行良好 - 我仅注释掉了与 FTP 传输相关的代码，因为我无法在这里执行此操作。我的机器相当新且速度很快，因此我怀疑可能存在计时问题。
堆栈跟踪指向的代码行可能存在 Thread.Sleep(nnn) 问题。如果 sleep 在写入者完成其任务之前阻塞线程，那么这可能会导致您的问题。
如果这是问题所在，与其在主线程上完成所有这些工作，不如生成一个新线程来执行执行并放置所有代码(除了我认为将 Thread.sleep 保留在主线程中)仅线程)在此处。通过使用单独的线程来执行写入任务，它将为写入者提供足够的时间来完成他们的任务，而不会被 sleep 耽搁。
此外，在您当前的实现中，如果某些内容没有更改，则不会调用 Sleep，因为它仅嵌入在循环的“已更改”部分中，因此它会直接返回检查时间又变了，一点也不耽误。
关于java - 为什么我在此循环中收到 java.io.IOException？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24856192/