A: what is this line of code
Public void replacement (String filePath, String oldstr, String newStr) {
The File f=new File (database. Path. Resident File path);
Long fileLength=f.l ength ();
Byte [] fileContext=new byte [fileLength intValue ()];

FileInputStream in=null;
PrintWriter out=null;

Try {
In=new FileInputStream (filePath);
In the read (fileContext);
String STR=new String (fileContext, "GBK");
STR=STR. Replace (oldstr, newStr);
Out=new PrintWriter (filePath);
Out. Write (STR);
} the catch (IOException e) {
e.printStackTrace();
} the finally {
Try {
out.flush();
out.close();
in.close();
} the catch (IOException e) {
e.printStackTrace();
}
}
}

CodePudding user response:

 import Java. IO. The File; 
import java.io.FileInputStream; 
import java.io.IOException; 
Import the Java. IO. PrintWriter; 

/* * 
* @ author: jiaolian 
* @ date: Created in these 2021-01-15 
* @ description: file reading and writing test 
* @ modified By: 
* public: call practice 
*/
Public class FileTest {

Public static void main (String [] args) {
Replece (" E: \ \ a1. TXT ", ""," practice called "); 
} 

//replace strings that will be file 
Public static void replece (String filePath, String oldstr, String newStr) {
The File f=new File (filePath); 
Long fileLength=f.l ength (); 
Byte [] fileContext=new byte [fileLength intValue ()]; 

FileInputStream in=null; 
PrintWriter out=null; 

Try {
//the file read into a byte array 
In=new FileInputStream (filePath); 
In the read (fileContext); 
//an array of bytes into a string 
String STR=new String (fileContext, "utf-8"); 
STR=STR. Replace (oldstr, newStr); 
//replace string to write to the file 
Out=new PrintWriter (filePath); 
Out. Write (STR); 
} the catch (IOException e) {
e.printStackTrace(); 
} the finally {
Try {
out.flush(); 
out.close(); 
in.close(); 
} the catch (IOException e) {
e.printStackTrace(); 
} 
} 
} 
} 

Intention is to do the string file method is used to replace, there are several errors in the code above, has a simple annotation, hope to help you

CodePudding user response:

Code or write not enough strong, such as when the file is too large, replacement is particularly slow,