[英]how to open all files in a directory in java, read them, creat new files, write to them
對不起,我沒有代碼,我在幾個答案中說了如何制作文件並寫入文件,但是還有另一個問題。 我在編譯中提供了一個文件夾的路徑,並且我想為每個以.jack結尾的文件創建以.xml結尾的相同文件名
並打開xml文件並寫入。 為例:
start.jack
bet.jack
=>
start.xml
bet.xml
在每個xml文件中,我想根據jack文件中的內容編寫內容。
所以實際上我需要打開jack文件,從中讀取文件,然后寫入xml文件本身。
我希望我能正確地解釋自己。
我的代碼:
public String readFile(String filename)
{
String content = null;
File file = new File(filename);
try {
FileReader reader = new FileReader(file);
char[] chars = new char[(int) file.length()];
reader.read(chars);
content = new String(chars);
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
return content;
}
我從stackoverflow那里獲得了這條線,並且效果很好
File f = new File("your folder path here");// your folder path
//**Edit** It is array of Strings
String[] fileList = f.list(); // It gives list of all files in the folder.
for(String str : fileList){
if(str.endsWith(".jack")){
// Read the content of file "str" and store it in some variable
FileReader reader = new FileReader("your folder path"+str);
char[] chars = new char[(int) new File("your folder path"+str).length()];
reader.read(chars);
String content = new String(chars);
reader.close();
// now write the content in xml file
BufferedWriter bw = new BufferedWriter(
new FileWriter("you folder path"+str.replace(".jack",".xml")));
bw.write(content); //now you can write that variable in your file.
bw.close();
}
}
列出文件夾中的所有“ .jack”文件:
File folder = new File(path);
File[] files = folder.listFiles();
for (File file:files)
{
if (file.isFile() && file.getAbsolutePath().endsWith(".jack"))
{
System.out.println(file);
}
}
替換擴展名:
String newPath = file.getAbsolutePath().replace(".jack", ".xml");
創建一個新文件並寫入:
PrintWriter writer = new PrintWriter("path to your file as string", "UTF-8");
writer.println("Your content for the new file...");
writer.close();
放在一起:
File folder = new File(path);
File[] files = folder.listFiles();
for (File file:files)
{
if (file.isFile() && file.getAbsolutePath().endsWith(".jack"))
{
String newPath = file.getAbsolutePath().replace(".jack", ".xml");
PrintWriter writer = new PrintWriter(newPath, "UTF-8");
string content = readFile(file.getAbsolutePath());
// modify the content here if you need to modify it
writer.print(content);
writer.close();
}
}
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