Java code example writing strings to text file

1. Filewriter and File--Write strings to text files

 public static void main(String[] args) { File f=new File("C://world.txt");//Create a new file object, and if it does not exist, create a file FileWriter fw; try { fw=new FileWriter(f); String str="hello world"; fw.write(str);//Write a string to the file under the specified path fw.close(); } catch (IOException e) { e.printStackTrace(); } }

2. InputStream and OutputStream Input and OutputStream Streaming

 public static void main(String args[]){File f= new File("C://world.txt") ;InputStream input = null ;// Prepare an input object try {input = new FileInputStream(f) ;byte b[] = new byte[1024] ;// All content is read into this array input.read(b) ;// Read content The read method in network programming will block input.close() ;System.out.println("Content is: " + new String(b)) ;}

 public static void main(String args[]){File f= new File("C://world.txt") ;// Declare File object OutputStream out = null ;// Prepare an output object out = new FileOutputStream(f) ;// Instantiate String str = "Hello World!!!" ;// Prepare a string byte b[] = str.getBytes() ;// Only output byte arrays, so change the string into a byte array out.write(b) ;// Output content, out.close() ;}

3. ObjectOutputStream and ObjectInputStream

ObjectOutputStream writes the basic data types and graphics of Java objects to OutputStream. Objects can be read (refactored) using ObjectInputStream. The persistent storage of objects can be achieved by using files in streams.

Write serialized objects to a file

1. Write serialized objects to file

FileOutputStreamfileStream=newFileOutputStream(“Myobject.ser”);//不存在则自动创建

2. Create an ObjectOutputStream

ObjectOutputStreamos=newObjectOutputStream(fileStream);

3. Write to the object

os.writeObject(one);//one是一个对象实例的引用名

4. Close ObjectOutputStream

os.close

ObjectInputStream is used for deserialization

Serialization

1. Create FileInputStream

FileInputStreamfileStream=newFileInputStream(“MyObject.ser”);

2. Create an ObjectInputStream

ObjectInputStreamos=newObjectInputStream(fileStream);

3. Read the object

Objectone=os.readObject();

4. Convert object type

Modelelf=(Model)one;//Model is the class name of one object

5. Close ObjectInputStream

os.close();

Summarize

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