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java中如何写入成绩

2026-03-18 23:32:58Java

写入成绩的方法

在Java中，写入成绩可以通过多种方式实现，具体取决于存储介质（如文件、数据库等）和需求。以下是几种常见的方法：

写入到文本文件

使用FileWriter或BufferedWriter将成绩写入文本文件：

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class WriteGradesToFile {
    public static void main(String[] args) {
        String fileName = "grades.txt";
        String[] grades = {"90", "85", "78", "92"};

        try (BufferedWriter writer = new BufferedWriter(new FileWriter(fileName))) {
            for (String grade : grades) {
                writer.write(grade);
                writer.newLine();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

写入到CSV文件

使用CSVWriter（如OpenCSV库）将成绩写入CSV文件：

import com.opencsv.CSVWriter;
import java.io.FileWriter;
import java.io.IOException;

public class WriteGradesToCSV {
    public static void main(String[] args) {
        String fileName = "grades.csv";
        String[] grades = {"90", "85", "78", "92"};

        try (CSVWriter writer = new CSVWriter(new FileWriter(fileName))) {
            for (String grade : grades) {
                writer.writeNext(new String[]{grade});
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

写入到数据库

使用JDBC将成绩写入数据库（如MySQL）：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class WriteGradesToDatabase {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/school";
        String user = "root";
        String password = "password";
        String[] grades = {"90", "85", "78", "92"};

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "INSERT INTO grades (score) VALUES (?)";
            PreparedStatement statement = conn.prepareStatement(sql);

            for (String grade : grades) {
                statement.setInt(1, Integer.parseInt(grade));
                statement.executeUpdate();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

写入到Excel文件

使用Apache POI库将成绩写入Excel文件：

java中如何写入成绩

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.FileOutputStream;
import java.io.IOException;

public class WriteGradesToExcel {
    public static void main(String[] args) {
        String fileName = "grades.xlsx";
        String[] grades = {"90", "85", "78", "92"};

        try (Workbook workbook = new XSSFWorkbook()) {
            Sheet sheet = workbook.createSheet("Grades");
            int rowNum = 0;

            for (String grade : grades) {
                Row row = sheet.createRow(rowNum++);
                Cell cell = row.createCell(0);
                cell.setCellValue(Integer.parseInt(grade));
            }

            try (FileOutputStream outputStream = new FileOutputStream(fileName)) {
                workbook.write(outputStream);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}