chenweicai

類Deflater 和 類Inflater：此類使用流行的 ZLIB 壓縮程序庫為通用壓縮提供支持。ZLIB 壓縮程序庫最初是作為 PNG 圖形標準的一部分開發的，不受專利的保護。

  //encoding a string into bytes
  String inputString = "chenweicai";
  byte[] input = inputString.getBytes("UTF-8");
  System.out.println("before compressed, the bytes length is :" + input.length);
  
  //compress the bytes
  byte[] output = new byte[100];
  Deflater compresser = new Deflater();
  compresser.setInput(input);
  compresser.finish();
  int compressedDataLength = compresser.deflate(output);
  System.out.println("compressed bytes length is :" + compressedDataLength);
  
  //decompress the bytes
  Inflater decompresser = new Inflater();
  decompresser.setInput(output, 0, compressedDataLength);
  byte[] result = new byte[100];
  int resultLength = decompresser.inflate(result);
  decompresser.end();
  System.out.println("after decompressed, the bytes length is :" + resultLength);
  
  //decode the bytes into a string
  String outputString = new String(result, 0, resultLength, "UTF-8");
  System.out.println("after compress and decompress the string is :" + outputString);


2.


import java.io.Serializable;

public class Employee implements Serializable {

 private String name;
 
 private double salary;

 public Employee(String name, double salary) {
  super();
  // TODO Auto-generated constructor stub
  this.name = name;
  this.salary = salary;
 }
 
 public void raiseSalary(double byPercent){
  double temp = salary * byPercent / 100;
  salary += temp;
 }

 public String toString() {
  // TODO Auto-generated method stub
  return getClass().getName() +
   "[ Name = " + name + ", salary = " + salary +"]";
 }
 
}





public class Test2 {

 protected byte[] deflate(Object object) throws IOException{
  
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  Deflater def = new Deflater (Deflater.BEST_COMPRESSION);
  DeflaterOutputStream dos = new DeflaterOutputStream(baos, def);
  
  ObjectOutputStream out = new ObjectOutputStream(dos);
  out.writeObject(object);
  out.close();
  dos.finish();
  dos.close();
  
  return baos.toByteArray();
 }
 
 protected Object inflate(byte[] compressedContent) throws IOException{
  if(compressedContent == null)
   return null;
  
  try{
   ObjectInputStream in = new ObjectInputStream(
     new InflaterInputStream(new ByteArrayInputStream(compressedContent)));
   Object object = in.readObject();
   in.close();
   return object;
  }catch(Exception e){
   throw new IOException(e.toString());
  }
 }
 
 public static void main(String[] args) throws IOException{
  Employee employee = new Employee("LiLei", 1000);
  Test2 test2 = new Test2();
  byte[] bytes = new byte[1000];
  
  bytes = test2.deflate(employee);
  System.out.println(bytes);
  
  System.out.println(test2.inflate(bytes));
  
 }
}