ObjectInputStream 和 ObjectOutputStream 介绍_动力节点Java学院整理
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，进而读取出这些“基本数据或对象”。
注意：只有支持java.io.Serializable或java.io.Externalizable接口的对象才能被ObjectInputStream/ObjectOutputStream所操作！
ObjectOutputStream函数列表
//构造函数 ObjectOutputStream(OutputStreamoutput) //public函数 voidclose() voiddefaultWriteObject() voidflush() ObjectOutputStream.PutFieldputFields() voidreset() voiduseProtocolVersion(intversion) voidwrite(intvalue) voidwrite(byte[]buffer,intoffset,intlength) voidwriteBoolean(booleanvalue) voidwriteByte(intvalue) voidwriteBytes(Stringvalue) voidwriteChar(intvalue) voidwriteChars(Stringvalue) voidwriteDouble(doublevalue) voidwriteFields() voidwriteFloat(floatvalue) voidwriteInt(intvalue) voidwriteLong(longvalue) finalvoidwriteObject(Objectobject) voidwriteShort(intvalue) voidwriteUTF(Stringvalue) voidwriteUnshared(Objectobject) ObjectInputStream函数列表 //构造函数 ObjectInputStream(InputStreaminput) intavailable() voidclose() voiddefaultReadObject() intread(byte[]buffer,intoffset,intlength) intread() booleanreadBoolean() bytereadByte() charreadChar() doublereadDouble() ObjectInputStream.GetFieldreadFields() floatreadFloat() voidreadFully(byte[]dst) voidreadFully(byte[]dst,intoffset,intbyteCount) intreadInt() StringreadLine() longreadLong() finalObjectreadObject() shortreadShort() StringreadUTF() ObjectreadUnshared() intreadUnsignedByte() intreadUnsignedShort() synchronizedvoidregisterValidation(ObjectInputValidationobject,intpriority) intskipBytes(intlength)
演示程序
源码如下(ObjectStreamTest.java)：
/**
*ObjectInputStream和ObjectOutputStream测试程序
*
*注意：通过ObjectInputStream,ObjectOutputStream操作的对象，必须是实现了Serializable或Externalizable序列化接口的类的实例。
*
*
*/
importjava.io.FileInputStream;
importjava.io.FileOutputStream;
importjava.io.ObjectInputStream;
importjava.io.ObjectOutputStream;
importjava.io.Serializable;
importjava.util.Map;
importjava.util.HashMap;
importjava.util.Iterator;
publicclassObjectStreamTest{
privatestaticfinalStringTMP_FILE="box.tmp";
publicstaticvoidmain(String[]args){
testWrite();
testRead();
}
/**
*ObjectOutputStream测试函数
*/
privatestaticvoidtestWrite(){
try{
ObjectOutputStreamout=newObjectOutputStream(
newFileOutputStream(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
HashMapmap=newHashMap();
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
Boxbox=newBox("desk",80,48);
out.writeObject(box);
out.close();
}catch(Exceptionex){
ex.printStackTrace();
}
}
/**
*ObjectInputStream测试函数
*/
privatestaticvoidtestRead(){
try{
ObjectInputStreamin=newObjectInputStream(
newFileInputStream(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
HashMapmap=(HashMap)in.readObject();
Iteratoriter=map.entrySet().iterator();
while(iter.hasNext()){
Map.Entryentry=(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
Boxbox=(Box)in.readObject();
System.out.println("box:"+box);
in.close();
}catch(Exceptione){
e.printStackTrace();
}
}
}
classBoximplementsSerializable{
privateintwidth;
privateintheight;
privateStringname;
publicBox(Stringname,intwidth,intheight){
this.name=name;
this.width=width;
this.height=height;
}
@Override
publicStringtoString(){
return"["+name+":("+width+","+height+")]";
}
}
运行结果：
boolean:true byte:65 char:a int:20131015 float:3.140000 double:1.414000 two--green one--red three--blue box:[desk:(80,48)]
以上所述是小编给大家介绍的ObjectInputStream和ObjectOutputStream的相关知识，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持！