使用java语言连接数据库编写一个简单的学生信息管理系统

public  static void findInfo(String  filePath) throws IOException {

//把之前存入到数据的文件，读取到集合中来。

ArrayList<Student> list = new ArrayList<Student>()

readData(list,filePath)

//遍历集合

for(int i=0i<list.size()i++) {

Student  stu = list.get(i)

System.out.println(stu.getId()+" "+stu.getName()+" "+stu.getAddress())

}

}

private static  void readData(ArrayList<Student> list ,String  filePath) throws NumberFormatException, IOException{

FileReader   fr = new FileReader(filePath)

BufferedReader  br = new BufferedReader(fr)

//读物文件里面的信息

String line = null

while((line=br.readLine())!=null) {

String[]  str = line.split(",")

//获取的数据封装成对象

//stu.getId()+","+stu.getName()+","+stu.getAge()

Student stu = new Student()

stu.setId(str[0])

stu.setName(str[1])

stu.setAge(Integer.valueOf(str[2]))

//将对象放到集合中区

list.add(stu)

}

}

//输入学生的信息

public static void addInfo(String filePath) throws IOException{

ArrayList<Student>list = new  ArrayList<Student>()

Scanner  sc = new Scanner(System.in)

//将输入的信息存放到集合里面去

for(int i=1i<=3i++) {

System.out.println("请输入第"+i+"个学生的id")

String  id = sc.next()

System.out.println("请输入第"+i+"个学生的name")

String   name  = sc.next()

System.out.println("请输入第"+i+"个学生的age")

int   age  = sc.nextInt()

Student  stu = new Student()

stu.setId(id)

stu.setAge(age)

stu.setName(name)

list.add(stu)

}

//将集合里面的信息写到文件里面去

writeDate(list,filePath)

}

Student 类

public class Student

{

private int id

private int age

private int score

private String name

public Student()

{

}

public Student(int id, int age, int score, String name)

{

this.id = id

this.age = age

this.score = score

this.name = name

}

public int getId()

{

return id

}

public void setId(int id)

{

this.id = id

}

public int getAge()

{

return age

}

public void setAge(int age)

{

this.age = age

}

public int getScore()

{

return score

}

public void setScore(int score)

{

this.score = score

}

public String getName()

{

return name

}

public void setName(String name)

{

this.name = name

}

@Override

public String toString()

{

return "学号：" + id + " 姓名：" + name + " 年龄：" + age + " 成绩：" + score

}

}

Manager类

import java.util.ArrayList

import java.util.Iterator

import java.util.List

public class Manager

{

private List<Student>list

public Manager(List<Student>list)

{

this.list = list

}

public List<Student>getList()

{

return list

}

public void setList(List<Student>list)

{

this.list = list

}

//添加学生

public void add(Student s)

{

list.add(s)

}

//根据学生学号返回学生年龄

public int search(int id)

{

for(Iterator<Student>iter = list.iterator()iter.hasNext())

{

Student s = iter.next()

if(s.getId() == id)

{

return s.getAge()

}

}

return -1

}

//删除学生

public void remove(int id)

{

for(Iterator<Student>iter = list.iterator()iter.hasNext())

{

Student s = iter.next()

if(s.getId() == id)

{

list.remove(s)

}

}

}

//计算总成绩

public int allScore()

{

int score = 0

int temp = 0

for(Iterator<Student>iter = list.iterator()iter.hasNext())

{

Student s = iter.next()

temp = s.getScore()

score += temp

}

return score

}

//修改成绩

public void update(int id)

{

for(Iterator<Student>iter = list.iterator()iter.hasNext())

{

Student s = iter.next()

if(s.getId() == id)

{

s.setScore(s.getScore() + 10)

}

}

}

}

测试类 Client

import java.util.ArrayList

import java.util.List

public class Client

{

public static void main(String[] args)

{

List<Student>list = new ArrayList<Student>()

Manager manager = new Manager(list)//创建一个管理者

Student s1 = new Student()//无参构造方法创建的学生实例

//通过方法设置s1的属性

s1.setId(201105)

s1.setAge(20)

s1.setScore(100)

s1.setName("zhangsan")

Student s2 = new Student(201101,21,98,"lisi")//通过带参数的构造方法创建实例

Student s3 = new Student(201108,25,95,"zhaoliu")

Student s4 = new Student(201110,23,80,"xiaoming")

Student s5 = new Student(201106,28,78,"hello")

//放到集合当中

manager.getList().add(s1)//添加学生

manager.getList().add(s2)

manager.getList().add(s3)

manager.getList().add(s4)

manager.getList().add(s5)

System.out.println(list)

System.out.println(manager.allScore())

System.out.println(manager.search(201110))//根据学生学号查询学生年龄

manager.remove(201110)//删除学生

manager.update(201101)//修改成绩

}

}

可以完成你上述的基本要求，如果改动可以自行修改 很简单。

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