Java学习 IO流 作业03

 

package work;

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.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

/*
 * 1.用代码实现以下需求
	(1)定义学生类,包含姓名(String name),性别(String gender),年龄(int age)三个属性,生成空参有参构造,set和get方法,toString方法
	(2)键盘录入6个学员信息(录入格式:张三,男,25),要求有两个相同的信息,将6个学员信息存入到ArrayList集合中
	(3)将存有6个学员信息的ArrayList集合对象写入到D:\\StudentInfo.txt文件中
	(4)读取D:\\StudentInfo.txt文件中的ArrayList对象
	(5)对ArrayList集合中的6个学生对象进行去重并按照年龄从小到大的顺序排序
	(6)将ArrayList集合中排序后的结果利用PrintWriter流写入到E:\\StudentInfo.txt文件中(写入格式：张三-男-25)
 */
public class Work01 {
	public static void main(String[] args)throws IOException,ClassNotFoundException {
		File file = new File("C:\\Users\\ZYX'sDay\\Desktop\\FileDemo\\StudentInfo.txt");
		ArrayList<Student> stuList = new ArrayList<>();
		stuList = studentList();
		stuFileW(stuList, file);
		stuList = stuFileR(file);
		stuList = listSort(stuList);
		pointFile(stuList,file);
		
	}
	//基本信息存储
	public static ArrayList<Student> studentList(){
		ArrayList<Student> stuList = new ArrayList<>();
		stuList.add(new Student("王二","男",22) );
		stuList.add(new Student("张三","男",21) );
		stuList.add(new Student("李四","男",23) );
		stuList.add(new Student("赵红","女",20) );
		stuList.add(new Student("郑晶","女",19) );
		stuList.add(new Student("王二","男",22) );
		
		return stuList;
	}
	//序列化流 写入studentInfo。txt
	public static void stuFileW(ArrayList<Student> stuList,File stufile)throws IOException{
		FileOutputStream fos = new FileOutputStream(stufile);
		ObjectOutputStream oos = new ObjectOutputStream(fos);
		
		oos.writeObject(stuList);
		oos.close();
		
	}
	//反序列化 读取
	public static ArrayList<Student> stuFileR(File stufile) throws IOException,ClassNotFoundException{
		FileInputStream fis = new FileInputStream(stufile);
		ObjectInputStream ois = new ObjectInputStream(fis);
		ArrayList<Student> stuList = new ArrayList<>();
		
		while(fis.available() > 0){
			Object os = ois.readObject();
			stuList = (ArrayList<Student>) os;
			System.out.println(os);
		}
		ois.close();
		
		return stuList;
	}
	//排序打印 list
	private static ArrayList<Student> listSort(ArrayList<Student> stuList) {
		for (int i = 0; i < stuList.size()-1; i++) {
			for (int j = i+1; j < stuList.size(); j++) {
				if(stuList.get(i).toString().equals(stuList.get(j).toString())){
					stuList.remove(j);
				}
			}
			
		}
		Collections.sort(stuList, new Comparator<Student>() {
			public int compare(Student s1,Student s2){
				if(s1.getAge() > s2.getAge()){
					return 1;
				}
				if(s1.getAge() == s2.getAge()){
					return 0;
				}
				return -1;
			}
		});
		
		System.out.println(stuList);
		return stuList;
	}
	//printWriter 方式写入
	private static void pointFile(ArrayList<Student> stuList,File file) throws FileNotFoundException {
		PrintWriter pWriter = new PrintWriter(file);
		pWriter.print(stuList);
		pWriter.close();
	}

}

Student类就省略了，都可以自动生成。 

package work;

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Properties;

/*
 * 2.用代码实现以下需求：
	(1)已知配置文件config.properties中有三个键值对
   		name=zhangsan
   		score=80
   		address=beijing
	(2)使用IO字节流对象和Properties类结合使用,将配置文件中的score键的值修改为100
 */
public class Work02 {
	public static void main(String[] args) throws IOException {
		File file = new File("C:\\Users\\ZYX'sDay\\Desktop\\FileDemo\\work02pro.properties");
		Properties pro = new Properties();
		
		pro.load(new FileReader(file));
		pro.setProperty("score", "100");
		pro.store(new FileWriter(file), "");
		System.out.println(pro);
		
		
		
	}

}

package work;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;

//3.获取指定目录及子目录下所有txt文件的个数，并将这些txt文件复制到D盘下任意目录
public class Work03 {
	static int count = 0;
	public static void main(String[] args) throws IOException{
		File file1 = new File("C:\\Users\\ZYX'sDay\\Desktop\\FileDemo");
		File file2 = new File("D:\\day23worktest\\day25work");
		
		copyTxt(file1,file2);
	}
	//拷贝
	private static void copyTxt(File file1, File file2) throws IOException {
		File[] files = file1.listFiles();
		for (File ff : files) {
			if(ff.isDirectory()){
				copyTxt(ff, file2);
			}else {
				if(FilenameUtils.isExtension(ff.getName(), "txt")){
					count++;
					FileUtils.copyFile(ff, new File(file2,ff.getName()));
				}
			}
		}
	}
	
	

}