IO流的檔案讀寫

 package Login;  
  
  
import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.io.FileOutputStream;  
import java.io.FileReader;  
import java.io.FileWriter;  
import java.io.IOException;  
import java.io.ObjectInputStream;  
import java.io.ObjectOutputStream;  
  
  
public class ObjectOutTest {  
/* 將物件寫入檔案方法 */  
public void write(Object o, String path) {  
   try {  
    /* 建立存取檔案 */  
    FileOutputStream fileStream = new FileOutputStream(path);  
    /* 將存取檔案寫入物件 */  
    ObjectOutputStream os = new ObjectOutputStream(fileStream);  
    /* 寫入物件 */  
    os.writeObject(o);  
    System.out.println("寫入資料成功");  
    /* 關閉ObjectOutputStream */  
    os.close();  
   } catch (FileNotFoundException e) {  
    e.printStackTrace();  
   } catch (IOException e) {  
    e.printStackTrace();  
   }  
}  
/* 將物件從檔案中讀出來 */  
public void read(String path) {  
   try {  
    /* 連線到要讀取的檔案 */  
    FileInputStream fileStream = new FileInputStream(path);  
    /* 怎樣讀取連線到的檔案 */  
    ObjectInputStream os = new ObjectInputStream(fileStream);  
    /* 讀取物件 */  
    Dog dog = (Dog) os.readObject();  
    System.out.println("輸出結果：" + dog.getName() + " is a "  
      + dog.getSex() + ",高:" + dog.getHeight() + ",長:"  
      + dog.getLength());  
    /* 關閉物件 */  
    os.close();  
   } catch (FileNotFoundException e) {  
    e.printStackTrace();  
   } catch (IOException e) {  
    e.printStackTrace();  
   } catch (ClassNotFoundException e) {  
    e.printStackTrace();  
   }  
}  
/* 往檔案寫入字串 */  
public void wirteString(String path, String context) {  
   try {  
    /* 建立寫入物件 */  
    FileWriter fileWriter = new FileWriter(path);  
    /* 建立緩衝區 */  
    BufferedWriter writer = new BufferedWriter(fileWriter);  
    /* 寫入字串 */  
    writer.write(context);  
    /* 關掉物件 */  
    writer.close();  
    System.out.println("寫入字串成功！");  
   } catch (IOException e) {  
    e.printStackTrace();  
   }  
}  
/* 讀取檔案中的字串 */  
public void readString(String path) {  
   try {  
    /* 建立讀取物件 */  
    FileReader fileReader = new FileReader(path);  
    /* 建立快取區 */  
    BufferedReader reader = new BufferedReader(fileReader);  
    /* 讀取檔案 */  
    String line = null;  
    while ((line = reader.readLine()) != null) {  
     System.out.println("讀取成功：" + line);  
    }  
    /* 關閉物件 */  
    reader.close();  
   } catch (FileNotFoundException e) {  
    e.printStackTrace();  
   } catch (IOException e) {  
    e.printStackTrace();  
   }  
}  
/* 出函式入口 */  
public static void main(String args[]) {  
   // Dog為外部類必須序列化才能實現它的物件的讀取  
   Dog d = new Dog();  
   d.setHeight(12);  
   d.setLength(23);  
   d.setName("bobi");  
   d.setSex('b');  
   ObjectOutTest qqt = new ObjectOutTest();  
   qqt.wirteString("F:/IO/cc.sex", "chengchao 123456789");  
   qqt.readString("F:/IO/cc.sex");  
    
     
}  
}