其读取方法为：
import java.io.Fileimport java.io.FileNotFoundException
import java.io.IOException
import java.util.ArrayList
public class readFile {
private static ArrayList<String> listname = new ArrayList<String>()
public static void main(String[] args)throws Exception{
readAllFile("C:/Users/HP/Desktop")
System.out.println(listname.size())
}
public static void readAllFile(String filepath) {
File file= new File(filepath)
if(!file.isDirectory()){
listname.add(file.getName())
}else if(file.isDirectory()){
System.out.println("文件")
String[] filelist=file.list()
for(int i = 0i<filelist.lengthi++){
File readfile = new File(filepath)
if (!readfile.isDirectory()) {
listname.add(readfile.getName())
} else if (readfile.isDirectory()) {
readAllFile(filepath + "\\" + filelist[i])//递归
}
}
}
for(int i = 0i<listname.size()i++){
System.out.println(listname.get(i))
}
}
}
package file.system.demo.exceptionimport java.io.File
import java.io.FileNotFoundException
import java.util.Scanner
public class ReadFile {
public static String getFile(String realpath) {
Scanner scanner = null
String text = ""
try {
File file= new File(realpath)
scanner = new Scanner(file)
} catch (FileNotFoundException e) {
e.printStackTrace()
}
if(scanner!=null){
while(scanner.hasNextLine()){
text+=scanner.nextLine()
}
scanner.close()
}
//System.out.println(text)
return text
}
static class InnerTest{
public static void main(String[] args) {
String realpath = "D:\\test.txt"
String text=getFile(realpath)
System.out.println(text)
}
}
}
实现方式有很多，还可以用字节流FileInputStream,字符流FileReader等方式读取
