File byte stream to fetch

package com.study02;

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

public class IOtest03 {
public static void main(String[] args) {

//1.创建源
File src = new File("abc.txt");
//2.选择流
FileInputStream is = null;

try {

is = new FileInputStream(src);

//3.操作：分段读取
byte[] flush = new byte[5];
int len = -1;
StringBuilder str = new StringBuilder();
while((len = is.read(flush)) != -1) {
String str1 = new String(flush,0,len);
str.append(str1);
}
System.out.println(str);

} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
if (is!=null) {
try {
// 4 free space
is.close ();
} the catch (IOException E) {
e.printStackTrace ();
}
}
}

}
}