我正在尝试构建一个永远循环的程序，它首先通过观察文件进行更改。当它改变时，它将保存的字符串保存到文件，然后再次等待文件的另一次更改，如果记录的两个字符串相同，则将一些信息上传到MySQL DB，但是在while循环中的最后一个函数重复重复并且没有完成while循环并重新启动！
这是我的代码，
package ClockCard;
import static java.nio.file.StandardWatchEventKinds.ENTRY_MODIFY;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.WatchEvent;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import java.sql.Timestamp;
public class FileWatch implements Runnable {
static String clkID;
static String clkID2;
static String ts;
static String ts1;
static boolean done = false;
static boolean REdone = false;
static boolean finished = false;
static boolean ready;
public static void main(String[] args) throws IOException,
InterruptedException {
while (true) {
checkFile();
Thread.sleep(3000);
REcheckFile();
Thread.sleep(500);
//Thread.
if (clkID.equals(clkID2)) {
DbConnect.test();
}
else {
System.out.println("Wrong matching ID's");
}
}
}
// Thread th = new Thread(new FileWatch());
// th.start();
// checkFile();
// REcheckFile();
// if (clkID2.equals(clkID2)){
// System.out.println("worked");
// }
// else {
// System.out.println("not worked");
// }
//
public static void check() throws InterruptedException{
checkFile();
Thread.sleep(3000);
REcheckFile();
Thread.sleep(500);
}
public String getClkId() {
return clkID;
}
public static void checkFile() {
while (!done) {
try {
WatchService watcher = FileSystems.getDefault()
.newWatchService();
Path dir = Paths.get("C:\\test");
dir.register(watcher, ENTRY_MODIFY);
System.out.println("Watch Service registered for dir: "
+ dir.getFileName());
WatchKey key;
try {
key = watcher.take();
} catch (InterruptedException ex) {
return;
}
for (WatchEvent<?> event : key.pollEvents()) {
WatchEvent.Kind<?> kind = event.kind();
@SuppressWarnings("unchecked")
WatchEvent<Path> ev = (WatchEvent<Path>) event;
Path fileName = ev.context();
System.out.println(kind.name() + ": " + fileName);
if (kind == ENTRY_MODIFY
&& fileName.toString().equals("test.txt")) {
System.out.println("My source file has changed!!!");
String sCurrentLine = null;
try (BufferedReader br = new BufferedReader(
new FileReader("C:\\test\\test.txt"))) {
while ((sCurrentLine = br.readLine()) != null) {
System.out.println(sCurrentLine);
clkID = sCurrentLine;
System.out.println(clkID);
java.util.Date date = new java.util.Date();
date = new Timestamp(date.getTime());
// System.out.println(new
// Timestamp(date.getTime()));
ts = date.toString();
System.out.println(ts);
}
} catch (IOException e) {
e.printStackTrace();
}
File inputFile = new File("C:\\test\\test.txt"); // Your
// file
File tempFile = new File("C:\\test\\myTempFile.txt");// temp
// file
BufferedReader reader = new BufferedReader(
new FileReader(inputFile));
BufferedWriter writer = new BufferedWriter(
new FileWriter(tempFile));
String currentLine;
while ((currentLine = reader.readLine()) != null) {
currentLine = ("");
writer.write(currentLine);
}
writer.close();
reader.close();
done = true;
boolean successful = tempFile.renameTo(inputFile);
System.out.println(successful);
}
}
boolean valid = key.reset();
if (!valid) {
break;
}
}
catch (IOException ex) {
System.err.println(ex);
}
}
}
public static void REcheckFile() {
while (!REdone) {
try {
WatchService watcher = FileSystems.getDefault()
.newWatchService();
Path dir = Paths.get("C:\\test");
dir.register(watcher, ENTRY_MODIFY);
System.out.println("Watch Service registered for dir: "
+ dir.getFileName());
WatchKey key;
try {
key = watcher.take();
} catch (InterruptedException ex) {
return;
}
for (WatchEvent<?> event : key.pollEvents()) {
WatchEvent.Kind<?> kind = event.kind();
@SuppressWarnings("unchecked")
WatchEvent<Path> ev = (WatchEvent<Path>) event;
Path fileName = ev.context();
System.out.println(kind.name() + ": " + fileName);
if (kind == ENTRY_MODIFY
&& fileName.toString().equals("test.txt")) {
System.out.println("My source file has changed!!!");
String sCurrentLine = null;
try (BufferedReader br = new BufferedReader(
new FileReader("C:\\test\\test.txt"))) {
while ((sCurrentLine = br.readLine()) != null) {
System.out.println(sCurrentLine);
clkID2 = sCurrentLine;
System.out.println(clkID2);
java.util.Date date1 = new java.util.Date();
date1 = new Timestamp(date1.getTime());
// System.out.println(new
// Timestamp(date.getTime()));
String ts1 = date1.toString();
System.out.println(ts1);
}
} catch (IOException e) {
e.printStackTrace();
}
File inputFile = new File("C:\\test\\test.txt"); // Your
// file
File tempFile = new File("C:\\test\\myTempFile.txt");// temp
// file
BufferedReader reader = new BufferedReader(
new FileReader(inputFile));
BufferedWriter writer = new BufferedWriter(
new FileWriter(tempFile));
String currentLine;
while ((currentLine = reader.readLine()) != null) {
currentLine = ("");
writer.write(currentLine);
}
writer.close();
reader.close();
REdone = true;
boolean successful = tempFile.renameTo(inputFile);
System.out.println(successful);
}
}
boolean valid = key.reset();
if (!valid) {
break;
}
}
catch (IOException ex) {
System.err.println(ex);
}
}
}
@Override
public void run() {
// TODO Auto-generated method stub
checkFile();
}
}
dbConnect.test（）只是输出测试，但它不断输出测试测试而不是重启，任何帮助都会非常感谢!!
强尼
答案 0 :(得分：0)
在checkFile()和ReCheckFile()方法中，您使用done和ReDone字段进行循环播放。
但是一旦他们都被设置为true，你的方法都变得无用了。并且在第一次迭代中将设置为true（仅在它设置为true之后，它将退出方法）。
因此，从第二次迭代开始，checkFile()和reCheckFile()实际上无法执行。
将字段重置为false和checkFile()方法顶部的reCheckFile()，或while中main循环内的字段。