Java 如何对文件进行多个Object对象流的读写操作

思路：把已经序列化的对象存入容器（如LinkedList<?>）中，然后用ObjectInputStream和ObjectOutputStream对这个实例化的LinkedList<?>对象进行读写。

测试主程序：

</pre><pre name="code" class="java">/** * @Title: FileRW.java * @Package com.file * @Description: 文件、文件夹的创建、写入练习。读写是使用对象流实现。 * @author 慢跑学Android * @date 2011-11-19 下午03:53:01 * @version V1.0 */ package com.file; import java.io.File; 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.LinkedList; public class FileRW { private String dirPath; private String filename; public static void main(String[] args) { String path = "C:\\晓声"; String fileName = "test.txt"; FileRW fileRW = new FileRW(path, fileName); LinkedList<TestMessage> msgOut = new LinkedList<TestMessage>(); LinkedList<TestMessage> msgIn = null; msgOut.add(new TestMessage("柯南", "偶像")); msgOut.add(new TestMessage("卡卡西", "好样的")); msgOut.add(new TestMessage("Android", "Android")); msgOut.add(new TestMessage("哈哈", "测试下喔")); fileRW.writeObject(path, fileName, msgOut); msgIn = fileRW.readObject(path,fileName); for(TestMessage temp:msgIn) { System.out.println(temp.getName() + temp.getData()); } } public FileRW(String dirPath, String filename) { this.dirPath = dirPath; this.filename = filename; if (creatDir()) { creatFile(); } } private boolean creatDir() { if (null != dirPath) { File path = new File(dirPath); if (path.exists()) { return true; } if (true == path.mkdirs() ) { return true; } } return false; } private void creatFile() { if (null != filename) { File file = new File(dirPath, filename); if (false == file.exists()) { try { file.createNewFile(); } catch (IOException e) { e.printStackTrace(); } } } } /** * @Title: writeObject * @Description: Write a object to a file. * @param path the directory of the target file * @param filename the name of the target file * @param msg the type of the object * @return void * @throws */ private void writeObject(String path, String filename, LinkedList<TestMessage> msg) { File file = new File(path, filename); if (false == file.isFile()) { return ; } try { // The value "false" for FileOutputStream means that overwrite this file, // if it is "true",append the new data to this file. ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file,false)); oos.writeObject(msg); oos.flush(); oos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * @Title: readObject * @Description: Read a object from a file. * @param path the directory of the target file * @param filename the name of the target file * @return LinkedList<TestMessage> * @throws */ @SuppressWarnings("unchecked") private LinkedList<TestMessage> readObject(String path, String filename) { File file = new File(path, filename); ObjectInputStream ois = null; LinkedList<TestMessage> msgAll = null; try { ois = new ObjectInputStream(new FileInputStream(file)); try { msgAll = (LinkedList<TestMessage>)ois.readObject(); } catch (ClassNotFoundException e) { e.printStackTrace(); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { ois.close(); } catch (IOException e) { e.printStackTrace(); } } return msgAll; } }

测试程序中的消息包定义：

/** * @Title: TestMessage.java * @Package com.file * @Description: FileRW的消息流 * @author 慢跑学Android * @date 2011-11-19 下午04:35:11 * @version V1.0 */ package com.file; public class TestMessage implements java.io.Serializable { private String name; private String data; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getData() { return data; } public void setData(String data) { this.data = data; } public TestMessage(String name, String msg) { this.name = name; data = msg; } }
程序运行结果：

参考资料：ObjectInputStream类和ObjectOutputStream类的使用