java操作io对象流进行数据的读写-pg电子游戏官网

对象的读写
使用objectinputstream和objectoutputstream读写对象(序列化与反序列化)。

只有字节流没有字符流

.类必须实现serializable接口 给类加个序列化编号，给类定义一个标记，新的修改后的类还可以操作曾经序列化的对象 静态是不能被序列化的，序列化只能对堆中的进行序列化 ，不能对“方法区”中的进行序列化 不需要序列化的字段前加 transient

小例子：

先创建一个dog对象并序列化:

package com.uwo9.test03; import .io.serializable; public class dog implements serializable {private static final long serialversionuid = 2809685095868158625l;string name;string color;}

再创建一个student对象并序列化：

package com.uwo9.test03; import java.io.serializable; public class student implements serializable {private static final long serialversionuid = 9078616504949971001l;static public string schoolname;private transient string name;private transient int age;private double score;private dog dog;public student() {super();}public student(string name, int age, double score, dog dog) {super();this.name = name;this.age = age;this.score = score;this.dog = dog;}public string getname() {return name;}public void setname(string name) {this.name = name;}public int getage() {return age;}public void setage(int age) {this.age = age;}public double getscore() {return score;}public void setscore(double score) {this.score = score;}@overridepublic string tostring() {return "student [name=" name ", age=" age ", score=" score "]";} }

将数据写入对象流并存入文件

package com.uwo9.test03; import java.io.file;import java.io.filenotfoundexception;import java.io.fileoutputstream;import java.io.ioexception;import java.io.objectoutputstream;import java.util.arraylist;import java.util.collections; public class test01 { public static void main(string[] args) {dog dog = new dog();dog.name = "大黄";dog.color = "yellow";student student1 = new student("学生1", 18, 99,dog);student student2 = new student("学生2", 19, 99,dog);student student3 = new student("学生3", 20, 99,dog);student.schoolname = "某某大学";file file = new file("e:/temp/test1.txt");objectoutputstream oos = null;try {oos = new objectoutputstream(new fileoutputstream(file));//oos.writeobject(student);arraylist arraylist = new arraylist<>();collections.addall(arraylist, student1,student2,student3);oos.writeobject(arraylist);} catch (filenotfoundexception e) {e.printstacktrace();} catch (ioexception e) {e.printstacktrace();}finally {try {oos.close();} catch (ioexception e) {e.printstacktrace();}}} }

从指定文件中读取对象

package com.uwo9.test03; import java.io.file;import java.io.fileinputstream;import java.io.filenotfoundexception;import java.io.ioexception;import java.io.objectinputstream;import java.util.arraylist; public class test02 { public static void main(string[] args) {// 从指定的文件中读取对象file file = new file("e:/temp/test1.txt");objectinputstream ois=null;try {ois = new objectinputstream(new fileinputstream(file));// 读取对象// student stu = (student)ois.readobject();// system.out.println("读取到的数据为:" stu);@suppresswarnings("unchecked")arraylist arraylist = (arraylist) ois.readobject();for (student student : arraylist) {system.out.println(student);}} catch (filenotfoundexception e) {e.printstacktrace();} catch (ioexception e) {e.printstacktrace();} catch (classnotfoundexception e) {e.printstacktrace();}finally {try {ois.close();} catch (ioexception e) {e.printstacktrace();}} } }

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