java.io.FileNotFoundException :

Question

我尝试使用 Java 将单个文件从源复制到目标，但收到以下错误消息。

java.io.FileNotFoundException:以下是方法

public void copy_single(String source,String dest,String filename)
{
  try
  { System.out.println(source + "" + filename);
    System.out.println(dest + "" + filename);
    File inputFile = new File(source+""+filename);
    File outputFile = new File(dest+""+filename);
    Process proc0 = Runtime.getRuntime().exec("chmod -R 777 "+inputFile+"");
    proc0.waitFor();
    Process proc1 = Runtime.getRuntime().exec("chmod -R 777 "+outputFile+"");
    proc1.waitFor();
    FileReader in = new FileReader(inputFile);
    FileWriter out = new FileWriter(outputFile);
    int c;
    while ((c = in.read()) != -1)
      out.write(c);
    in.close();
    out.close();
  } catch(Exception e) {
    e.printStackTrace();
    System.out.println("Error: Operation failed!");
  }
}

输出:-

/home/root/Tool/AAputDelta.sh
/home/root/Desktop/Sqa/BaseLine/Engine/AAputDelta.sh
java.io.FileNotFoundException: /home/root/Desktop/Sqa/BaseLine/Engine/AAputDelta.sh (No such file or directory)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:194)
at java.io.FileOutputStream.<init>(FileOutputStream.java:145)

如何使用java复制简单文件。

Answer 1

怀疑部分或全部dest输出路径可能不存在。如果是这种情况，您可以使用 File.mkdirs构建路径。

此外，建议允许 File 而不是从字符串构建文件。处理所有这些，例如:

File inputFile = new File(source, filename);
File outputFile = new File(dest, filename);