寫幾個關於IO的回顧吧，IO回顧吧

寫幾個關於IO的回顧吧，IO回顧吧

上午將開題報告寫完了。下午的時候做了90道關於javaSE部分的題。晚上把Jdbc串連部分又回顧了一下。現在回顧一下IO的幾個封裝類吧。
ObjectInputStream/ObjectOutputStream

ObjectOutputStream oos = null;try{    oos = new ObjectOutputStream(new FileOutputStream(new File("person.bat")));    oos.writeObject(new Person("zhangsan",23));    oos.flush();    oos.writeObject(new Person("lisi",12));    oos.flush();} catch(Exception e){    System.out.println(e.getMessage());} finally {    if(oos != null){        try{            oos.close();        } catch(){        }    }}

try{ObjectInputStream ois = new ObjectInputStream(new FileInputStream("person.bat"));Person per1 = ois.readObject();Person per2 = ois.readObject();System.out.println("per1:" + per1 + " per2:" + per2);} catch(Exception e){    System.out.println(e.getMessage());} finally {    if(ois != null){        try{            ois.close();        }catch(){        }    }}

public class Person implements Serializable{    private static final long serivalVersionUID = 1L;    private String name;    private int age;    ......}

這就完成了對象的序列化和還原序列化

再來一個比較特殊的

RandomAccessFile raf1 = null;RandomAccessFile raf2 = null;try{    raf1 = new RandomAccessFile(new File("a.txt"), "r");    raf2 = new RandomAccessFile(new File("b.txt"), "rw");    byte[] b = new byte[20];    int len;    while((len = raf1.read(b))!= -1){        raf2.write(b, 0, len);    }} catch(){}finally {    if(raf1 != null){        try{            ra1.close();        } catch (){        }        try{            raf2.close();        } catch (){        }    }}

這樣好像什麼效果都沒體現出來！！！！其實主要還是一個seek（）方法的使用

再看看這個例子

@Test    public void test(){        RandomAccessFile rs1 = null;        try {            rs1 = new RandomAccessFile(new File("e.txt"), "rw");            rs1.seek(4);            StringBuffer sb = new StringBuffer(rs1.readLine());            rs1.seek(4);            rs1.write("xy".getBytes());            rs1.write(sb.toString().getBytes());        } catch (IOException e) {            e.printStackTrace();        } finally {            if(rs1 != null){                try {                    rs1.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }