将多个对象读写到文件

方法：

1.对象实现序列化 即

implements Serializable 

2，将对个对象先存在数组中，

3，将整个数组作为一个对象存入文件中

4，将整个数组作为一个对象读出来

代码事例：来自：http://www.iteye.com/problems/66209

java数组序列化后存储到文件，读出来的数据和写入的不一样5

**************************************************
import java.io.Serializable;
public class Map implements Serializable{
private byte[][] map;

public byte[][] getMap() {
return map;
}
public void setMap(byte[][] map) {
this.map = map;
}
}
********************************************************
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Arrays;
import java.util.Vector;

public class ControlMap {

Vector<Map> mapVector=new Vector<Map>();

public void writeMap(byte myMap[][])
{
readMap();
ObjectOutputStream oos;
try {
oos = new ObjectOutputStream(new FileOutputStream("map.map"));
Map map=new Map();
map.setMap(myMap);
mapVector.add(map);
oos.writeObject(mapVector);
oos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

public void readMap()
{
try {
ObjectInputStream ois=new ObjectInputStream(new FileInputStream("map.map"));
mapVector=(Vector)(ois.readObject());
} 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 String toString()
{
readMap();
int size=mapVector.size();
String temp="";
for(int i=0;i<size;i++)
{
temp+="第"+(i+1)+"张地图:\n";
Map map=mapVector.get(i);
byte mapData[][]=map.getMap();
for(int j=0;j<mapData.length;j++)
temp+=Arrays.toString(mapData[i])+"\n";
temp+="\n";
}
return temp;
}

}
***************************************************************************************

public class Test {

public static void main(String[] args) {
ControlMap control=new ControlMap();
byte [][] myMap={
{3,7,5,2,4,6,8},
{3,7,5,2,4,6,8},
{3,7,5,2,4,6,8},
{3,7,5,2,4,6,8},
{3,7,5,2,4,6,8},
{3,7,5,2,4,6,8},
{3,7,5,2,4,6,8}
};
control.writeMap(myMap);
System.out.println(control);
}

}