java日常笔记2016-12-22

最新推荐文章于 2025-10-01 08:00:00 发布

原创最新推荐文章于 2025-10-01 08:00:00 发布 · 219 阅读

0 ·

CC 4.0 BY-SA版权

学习期专栏收录该内容

27 篇文章

订阅专栏

本文介绍了一个Java程序示例，该程序用于从TXT文件中读取学生信息，并通过一个实体类和DAO层实现数据访问操作。示例中包含了实体类Student的定义及其属性，同时展示了如何使用Scanner类来逐行读取文件内容。

读取txt文件的数据

1：需要一个实体类：entity包→Student;

package test20161222.date.entity;

import java.util.Date;

public class Student {
	private String id;
	private String name;
	private String stuNo;
	private String sex;
	private Date birthday;

	public Student() {
	}

	public Student(String id, String name, String stuNo, String sex,
			Date birthday) {
		this.id = id;
		this.name = name;
		this.stuNo = stuNo;
		this.sex = sex;
		this.birthday = birthday;
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getStuNo() {
		return stuNo;
	}

	public void setStuNo(String stuNo) {
		this.stuNo = stuNo;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	@Override
	public String toString() {
		return "Student [id=" + id + ", name=" + name + ", stuNo=" + stuNo
				+ ", sex=" + sex + ", birthday=" + birthday + "]";
	}

}

2:dao层→Data Access Object（接口和实现类）

package test20161222.date.dao;

import java.util.List;
import java.util.Map;

import test20161222.date.entity.Student;

public interface StudentDao {
	public Student getStudentById(String id);
	public List<Student> getAllStudents();
	public Map<String,Student> getAllStudentsMap();
}

public class StudentDaoImpl implements StudentDao{
	private String path;
	private Scanner sca = null;
	public StudentDaoImpl(String path) {
		this.path = path;
		if(this.getPath()!=null){
		}
	}
	@Override
	public Student getStudentById(String id) {
		try {
			Scanner sca = new Scanner(new FileInputStream(new File(path)),"GBK");
			
			while(sca.hasNextLine()){
				String each = sca.nextLine();
				System.out.println(each);
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}
}