如何将临时文本文件重命名为主文本文件并删除以前存在的主文件

Question

此代码将更新的记录插入到临时文件中，插入后必须将 temporary.txt 重命名为主文件，因为它有更新的记录。但是那时我想删除原始的主文本。怎么办？存款模块。

public void insertIntoTempoFile(String uID,String uName,String mobNo,String depoAmt)
{   File f1= new File("C:\Users\hp\Desktop\BankReport\temporary.txt");
    File f2= new File("C:\Users\hp\Desktop\BankReport\master.txt");

    FileWriter fwTemp = null;
    
try {
    f1.createNewFile();

    
    fwTemp = new FileWriter(f1,true);
        
     fwTemp.write(uID);  
     fwTemp.write("#");
     fwTemp.write(uName);  
     fwTemp.write("#");
     fwTemp.write(mobNo);  
     fwTemp.write("#");
     fwTemp.write(depoAmt);  
     fwTemp.write("\n");
  } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

finally {
    try {
        fwTemp.close();
         
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Answer 1

下面的代码将数据写入temporary.txt，如果没有异常，则将文件重命名为master.txt。

public static void main(String[] args) {
    insertIntoTempoFile("123", "Garreth", "321", "345");
}

private static void insertIntoTempoFile(String uID, String uName, String mobNo, String depoAmt) {
    String directory = "C:\Users\hp\Desktop\BankReport\";
    String sourceFilename = "temporary.txt";
    String targetFilename = "master.txt";

    Path sourcePath = Paths.get(directory + sourceFilename);

    String row = uID + "#" + uName + "#" + mobNo + "#" + depoAmt + "\n";

    try {
        Files.write(sourcePath, row.getBytes());
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        renameMasterFileIfExists(directory, sourceFilename, targetFilename);
    }
}

/**
 * Take a look here for more details https://mkyong.com/java/how-to-rename-file-in-java/
 */
private static void renameMasterFileIfExists(String directory, String sourceFilename, String targetFilename) {
    Path source = Paths.get(directory + sourceFilename);
    Path target = Paths.get(directory + targetFilename);

    try {
        Files.move(source, target, StandardCopyOption.REPLACE_EXISTING);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

如何将临时文本文件重命名为主文本文件并删除以前存在的主文件

How to rename temporary text file to master text file and delete privious existed master file

java

file-handling