Java-IO之对象输入流输出流(ObjectInputStream和ObjectOutputStream)
2016-10-03 19:53
435 查看
ObjectInputStream和ObjectOutputStream的作用是对基本数据和对象进行序列化操作支持。创建文件输出流对应的ObjectOutputStream对象,该ObjectOutputStream对象能提供对基本数据或对象的持久存储,当我们需要读取这些存储的基本数据或对象时,可以创建文件输入流对应的ObjectInputStream,进而读取这些基本数据或对象。
ObjectOutputStream类主要函数:
运行结果:
boolean:true
byte:65
char:a
int:20131015
float:3.140000
double:1.414000
three -- blue
two -- green
one -- red
box: [desk: (80, 48) ]
ObjectOutputStream类主要函数:
// 构造函数 ObjectOutputStream(OutputStream output) // public函数 void close() void defaultWriteObject() void flush() ObjectOutputStream.PutField putFields() void reset() void useProtocolVersion(int version) void write(int value) void write(byte[] buffer, int offset, int length) void writeBoolean(boolean value) void writeByte(int value) void writeBytes(String value) void writeChar(int value) void writeChars(String value) void writeDouble(double value) void writeFields() void writeFloat(float value) void writeInt(int value) void writeLong(long value) final void writeObject(Object object) void writeShort(int value) void writeUTF(String value) void writeUnshared(Object object)ObjectInputStream类主要函数:
// 构造函数 ObjectInputStream(InputStream input) int available() void close() void defaultReadObject() int read(byte[] buffer, int offset, int length) int read() boolean readBoolean() byte readByte() char readChar() double readDouble() ObjectInputStream.GetField readFields() float readFloat() void readFully(byte[] dst) void readFully(byte[] dst, int offset, int byteCount) int readInt() String readLine() long readLong() final Object readObject() short readShort() String readUTF() Object readUnshared() int readUnsignedByte() int readUnsignedShort() synchronized void registerValidation(ObjectInputValidation object, int priority) int skipBytes(int length)示例代码:
clas Box implements Serializable { private int width; private int height; private String name; public Box(String name, int width, int height) { this.name = name; this.width = width; this.height = height; } @Override public String toString() { return "["+name+": ("+width+", "+height+") ]"; } }
public class ObjectStreamTest { private static final String TMP_FILE = "box.tmp"; public static void main(String[] args) { testWrite(); testRead(); } /** * ObjectOutputStream 测试函数 */ private static void testWrite() { try { ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream(TMP_FILE)); out.writeBoolean(true); out.writeByte((byte)65); out.writeChar('a'); out.writeInt(20131015); out.writeFloat(3.14F); out.writeDouble(1.414D); // 写入HashMap对象 HashMap map = new HashMap(); map.put("one", "red"); map.put("two", "green"); map.put("three", "blue"); out.writeObject(map); // 写入自定义的Box对象,Box实现了Serializable接口 Box box = new Box("desk", 80, 48); out.writeObject(box); out.close(); } catch (Exception ex) { ex.printStackTrace(); } } /** * ObjectInputStream 测试函数 */ private static void testRead() { try { ObjectInputStream in = new ObjectInputStream(new FileInputStream(TMP_FILE)); System.out.printf("boolean:%b\n" , in.readBoolean()); System.out.printf("byte:%d\n" , (in.readByte()&0xff)); System.out.printf("char:%c\n" , in.readChar()); System.out.printf("int:%d\n" , in.readInt()); System.out.printf("float:%f\n" , in.readFloat()); System.out.printf("double:%f\n" , in.readDouble()); // 读取HashMap对象 HashMap map = (HashMap) in.readObject(); Iterator iter = map.entrySet().iterator(); while (iter.hasNext()) { Map.Entry entry = (Map.Entry)iter.next(); System.out.printf("%-6s -- %s\n" , entry.getKey(), entry.getValue()); } // 读取Box对象,Box实现了Serializable接口 Box box = (Box) in.readObject(); System.out.println("box: " + box); in.close(); } catch (Exception e) { e.printStackTrace(); } } }
运行结果:
boolean:true
byte:65
char:a
int:20131015
float:3.140000
double:1.414000
three -- blue
two -- green
one -- red
box: [desk: (80, 48) ]
相关文章推荐
- Java-IO之对象输入流输出流(ObjectInputStream和ObjectOutputStream)
- Java-IO之对象输入流输出流(ObjectInputStream和ObjectOutputStream)
- 我的Java开发学习之旅------>Java使用ObjectOutputStream和ObjectInputStream序列号对象报java.io.EOFException异常的解决方法
- (JAVA)从零开始之--对象输入输出流ObjectInputStream、ObjectOutputStream(对象序列化与反序列化)
- Java IO--对象序列化Serializable、ObjectOutputStream、ObjectInputStream、transient
- Java IO系列(五):读写对象ObjectOutputStream和ObjectInputStream
- Java使用ObjectOutputStream和ObjectInputStream序列号对象报java.io.EOFException异常的解决方法
- Java IO ObjectInputStream和ObjectOutputStream
- Java的IO操作(三) - 对象的序列化、ObjectInputStream和ObjectOutputStream类
- Java_io体系之ObjectInputStream、ObjectOutputStream简介、走进源码及示例——11
- Java IO之对象的序列化、ObjectInputStream和ObjectOutputStream类
- I学霸官方免费教程四十二 :Java流之字节流 输入流和输出流 InputStream和OutputStream
- java_IO流之ObjectInputStream与ObjectOutputStream的使用
- Java IO操作——对象序列化(Serializable接口、ObjectOutputStream、以及与Externalizable接口的用法和区别)
- 使用对象输入输出流(ObjectOutputStream,ObjectInputStream)实现序列化对象的深度克隆
- Java对象序列化ObjectOutputStream和ObjectInputStream示例
- java.io.ObjectOutputStream.putFields()和java.io.ObjectInputStream. readFields()
- 智渔课堂官方免费教程四十二 :Java流之字节流 输入流和输出流 InputStream和OutputStream
- java对象流ObjectInputStream、ObjectOutputStream的使用
- java将系列化后的对象保存在文件中,及反系列化 (ObjectInputStream,ObjectOutputStream)