Java练习 关于IO流 对象 读写的案例
Java练习 关于IO流 对象 读写的案例
方法一：把对象存入文件中进行读写：
package com.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
public class Test {
public static void main(String[] args) {
Student s1 = new Student("刘广法博客", "001");
Student s2 = new Student("网址是：liuguangfa.com", "002");
// 输出(通过文件进行输出)
File file = new File("d:/aa.cc");
ObjectOutputStream out = null;
ObjectInputStream objin = null;
try {
file.createNewFile();
OutputStream bout = new FileOutputStream(file);
out = new ObjectOutputStream(bout);
// 输出过程
out.writeObject(s1);
out.writeObject(s2);
out.writeObject(null);
// 输入
InputStream in = new FileInputStream(file);
objin = new ObjectInputStream(in);
Object object;
while ((object = objin.readObject()) != null) {
System.out.println(object);
}
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
out.close();
objin.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}Java控制台：
Student [nameString=刘广法博客, idString=001]
Student [nameString=网址是：liuguangfa.com, idString=002]
将读写过程分开的过程如下：
/**
* 将文件进行对象进行保存
*/
public void objFile() {
File file = new File("d:/employee");
ObjectOutputStream osObject = null;
try {
// 判断输出流的文件是否存在
if (!file.canExecute()) {
file.createNewFile();
}
OutputStream os = new FileOutputStream(file);
osObject = new ObjectOutputStream(os);
// 输出的过程
for (int i = 0; i < employees.size(); i++) {
osObject.writeObject(employees.get(i));
// if (i == (employees.size() - 1)) {
// osObject.writeObject(employees.get(i));
// osObject.writeObject(null);
// } else {
// osObject.writeObject(employees.get(i));
// }
}
osObject.writeObject(null);
osObject.flush();
} catch (
FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
osObject.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
* 将对象文件读取出来
*/
public void readerObjectFile() {
File file = new File("d:/employee");
// 判断文件是否存在
if (file.canExecute()) {
}
// 将文件读取到系统中
ObjectInputStream isObject = null;
try {
InputStream is = new FileInputStream(file);
isObject = new ObjectInputStream(is);
Object obj = null;
while ((obj = isObject.readObject()) != null) {
employees.add((Employees) obj);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
isObject.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}方法二：把对象存入字符中进行读写：
文章来源：刘广法，转载请注明出处。原文链接网站为：https://liuguangfa.com/
