Write a list, map object to a file in Java

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body font size: Big medium small Write a list, map object to a file in Java(2014-03-17 17:39:36) reproduced

Tags: it

Category: JAVA

Java's IO package provides a way to write files and read files to a file. Well, let's see what's going on. Let's start by writing a method like writing a single object in a file. 

public void WriteObject () {
  try {
   
   hashmap<</span>string,string> map = new hashmap<</span>string,string> ();
   Map.put ("name", "Foolfish");
   
   
   FileOutputStream OutStream = new FileOutputStream ("E:/1.txt");
   ObjectOutputStream ObjectOutputStream = new ObjectOutputStream (OutStream);
   
   Objectoutputstream.writeobject (map);
   Outstream.close ();
   System.out.println ("successful");
  } catch (FileNotFoundException e) {
   E.printstacktrace ();
  } catch (IOException e) {
   E.printstacktrace ();
  }
}

Here we will insert a map object into a TXT file. Java's IO package provides a file stream of object. The code is simple, let's take a look at the object from the file.

public void ReadObject () {
  FileInputStream Freader;
  try {
   Freader = new FileInputStream ("E:/1.txt");
   ObjectInputStream ObjectInputStream = new ObjectInputStream (Freader);
   hashmap<</span>string,string> map = new hashmap<</span>string,string> ();
    Map = (hashmap<</span>string, string>) objectinputstream.readobject ();
   
    System.out.println ("The name is" + map.get ("name"));
   
  } catch (FileNotFoundException e) {
   TODO auto-generated Catch block
   E.printstacktrace ();
  } catch (IOException e) {
   TODO auto-generated Catch block
   E.printstacktrace ();
  } catch (ClassNotFoundException e) {
   TODO auto-generated Catch block
   E.printstacktrace ();
  }
  
}

The code is also very simple, we can read the object in the file using ObjectInputStream's ReadObject, and then follow the package to

The type of the image time to cast. The output is AA foolfish.

The above provides the deposit and reading of a single object. This method also applies to multiple different objects. Let's use the code to illustrate it. We also insert two different objects, a map, and a list.

public class Objecttofile {
public void WriteObject () {
try {
   
hashmap<</span>string,string> map = new hashmap<</span>string,string> ();
Map.put ("name", "Foolfish");
   
list<</span>string> list = new arraylist<</span>string> ();
List.add ("Hello");
List.add ("everyone");
   
   
FileOutputStream OutStream = new FileOutputStream ("E:/1.txt");
ObjectOutputStream ObjectOutputStream = new ObjectOutputStream (OutStream);
   
Objectoutputstream.writeobject (map);
Objectoutputstream.writeobject (list);
Outstream.close ();
System.out.println ("successful");
} catch (FileNotFoundException e) {
E.printstacktrace ();
} catch (IOException e) {
E.printstacktrace ();
}
}
 
public void ReadObject () {
FileInputStream Freader;
try {
Freader = new FileInputStream ("E:/1.txt");
ObjectInputStream ObjectInputStream = new ObjectInputStream (Freader);
hashmap<</span>string,string> map = new hashmap<</span>string,string> ();
Map = (hashmap<</span>string, string>) objectinputstream.readobject ();
arraylist<</span>string> list = new arraylist<</span>string> ();
List = (arraylist<</span>string>) objectinputstream.readobject ();
System.out.println ("The name is" + map.get ("name"));
System.out.println ("AA" + list.get (1));
} catch (FileNotFoundException e) {
TODO auto-generated Catch block
E.printstacktrace ();
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
} catch (ClassNotFoundException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
  
}
 
 
public static void Main (String args[]) {
Objecttofile of = new Objecttofile ();
Of.writeobject ();
Of.readobject ();
}
}

Write a list, map object to a file in Java