如何在java中保存文件

Question

我正在尝试从日志报告创建一个文件。为了保存文件，我创建了一个按钮。当按钮被按下时，执行以下代码:

public void SAVE_REPORT(KmaxWidget widget){//save
  try {
    String content = report.getProperty("TEXT");
    File file = new File("logKMAX.txt");
    // if file doesnt exists, then create it
    if (!file.exists()) {
      file.createNewFile();
    }
    FileWriter fw = new FileWriter(file.getAbsoluteFile());
    BufferedWriter bw = new BufferedWriter(fw);
    bw.write(content);
    bw.close();
  } catch (IOException e) {
    e.printStackTrace();
  }
} //SAVE_REPORT

我没有编译错误，但是没有保存任何文件。

有什么问题吗?

Answer 1

使用新的文件API。首先，在您的程序中，您不验证.createNewFile()的返回值:它不会在失败时抛出异常…

使用新的文件API，它要简单得多:

public void saveReport(KmaxWidget widget)
    throws IOException
{
    final String content = report.getProperty("TEXT");
    final Path path = Paths.get("logKMAX.txt");
    try (
        final BufferedWriter writer = Files.newBufferedWriter(path,
            StandardCharsets.UTF_8, StandardOpenOption.CREATE);
    ) {
        writer.write(content);
        writer.flush();
    }
}

Answer 2

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
public class moveFolderAndFiles
{
    public static void main(String[] args) throws Exception 
    {   
        File sourceFolder = new File("c:\Audio Bible");
        copyFolder(sourceFolder);
    }
    private static void copyFolder(File sourceFolder) throws Exception
    {
        File files[] = sourceFolder.listFiles();
        int i = 0;
        for (File file: files){
            if(file.isDirectory()){
                File filter[] = new File(file.getAbsolutePath()).listFiles();
                for (File getIndividuals: filter){
                    System.out.println(i++ +"t" +getIndividuals.getPath());
                    File des = new File("c:\audio\"+getIndividuals.getName());
                    Files.copy(getIndividuals.toPath(), des.toPath(), StandardCopyOption.REPLACE_EXISTING);
                }
            }
        }
    }
}