同步声明可以做到这一点。尝试下面的代码，我在类似的情况下使用。
package hrblib;
import java.io.*;
public class FileOp {
static int nStatsCount = 0;
static public String getContents(String sFileName) {
try {
BufferedReader oReader = new BufferedReader(new FileReader(sFileName));
String sLine, sContent = "";
while ((sLine=oReader.readLine()) != null) {
sContent += (sContent=="")?sLine: ("\r\n"+sLine);
}
oReader.close();
return sContent;
}
catch (IOException oException) {
throw new IllegalArgumentException("Invalid file path/File cannot be read: \n" + sFileName);
}
}
static public void setContents(String sFileName, String sContent) {
try {
File oFile = new File(sFileName);
if (!oFile.exists()) {
oFile.createNewFile();
}
if (oFile.canWrite()) {
BufferedWriter oWriter = new BufferedWriter(new FileWriter(sFileName));
oWriter.write (sContent);
oWriter.close();
}
}
catch (IOException oException) {
throw new IllegalArgumentException("Invalid folder path/File cannot be written: \n" + sFileName);
}
}
public static synchronized void appendContents(String sFileName, String sContent) {
try {
File oFile = new File(sFileName);
if (!oFile.exists()) {
oFile.createNewFile();
}
if (oFile.canWrite()) {
BufferedWriter oWriter = new BufferedWriter(new FileWriter(sFileName, true));
oWriter.write (sContent);
oWriter.close();
}
}
catch (IOException oException) {
throw new IllegalArgumentException("Error appending/File cannot be written: \n" + sFileName);
}
}
}
