java 文件读写_FileInputStream_File

核心提示：package test;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class Test { public static voi

package test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test {

public static void main(String arg[]) {
　String fileName = "E:\\share\\test.txt";
　File file = new File(fileName);
　String writeData = "HelloWorld!\r\nnihao我的内存是2G的 ";
　byte[] byteOutData = writeData.getBytes();
　byte[] byteInData = new byte[20];
　int length = 0;
　if (file.isFile()) {
　 file.delete();
　}
　try {

　 if (file.createNewFile() && file.canWrite()) {
　　FileOutputStream fileOutStream = new FileOutputStream(file);
　　fileOutStream.write(byteOutData);
　　fileOutStream.close();
　 }
　 if (file.canRead()) {
　　FileInputStream fileInStream = new FileInputStream(file);
　　while ((length = fileInStream.read(byteInData)) != -1) {
　　 System.out.PRint(new String(byteInData, 0, lenght));
　　}
　　fileInStream.close();
　 }
　} catch (IOException e) {
　 System.out.println("IOException occur");
　 e.getMessage();
　}
}
}



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