Add files via upload

系统开发excel/src/com/company/Excel.java

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+package com.company;
+import org.apache.poi.ss.usermodel.*;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+
+import java.io.*;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+
+
+
+
+public class Excel {
+
+
+
+
+    public void create(){
+        String fileName = "Alldata.xlsx";
+        String sheetName = "user";
+        String[] columnHeaders = {"用户ID", "用户名", "用户密码", "类型", "用户级别", "用户注册时间", "客户累计消费总金额", "用户手机号", "用户邮箱"};
+
+        Workbook workbook = null;
+        try {
+            File file = new File(fileName);
+            if (!file.exists()) {
+                // 创建新的Excel文件
+                workbook = new XSSFWorkbook();
+            } else {
+                // 打开现有的Excel文件
+                FileInputStream fileInputStream = new FileInputStream(file);
+                workbook = new XSSFWorkbook(fileInputStream);
+                fileInputStream.close();
+            }
+
+            // 获取或创建表格
+            Sheet sheet = workbook.getSheet(sheetName);
+            if (sheet == null) {
+                sheet = workbook.createSheet(sheetName);
+                // 写入列头
+                Row headerRow = sheet.createRow(0);
+                for (int i = 0; i < columnHeaders.length; i++) {
+                    Cell cell = headerRow.createCell(i);
+                    cell.setCellValue(columnHeaders[i]);
+                }
+            }
+
+            String sheetName1 = "commodity";
+            String[] columnHeaders1 = {"商品编号", "商品名称", "商品厂家", "生产日期", "型号", "进货价", "零售价", "数量"};
+            Sheet sheet1 = workbook.getSheet(sheetName1);
+            if (sheet1 == null) {
+                sheet1 = workbook.createSheet(sheetName1);
+                // 写入列头
+                Row headerRow = sheet1.createRow(0);
+                for (int i = 0; i < columnHeaders1.length; i++) {
+                    Cell cell = headerRow.createCell(i);
+                    cell.setCellValue(columnHeaders1[i]);
+                }
+            }
+
+
+            String sheetName2 = "shopcart";
+            String[] columnHeaders2 = {"用户名", "商品", "价格", "数量"};
+            Sheet sheet2 = workbook.getSheet(sheetName2);
+            if (sheet2 == null) {
+                sheet2 = workbook.createSheet(sheetName2);
+                // 写入列头
+                Row headerRow = sheet2.createRow(0);
+                for (int i = 0; i < columnHeaders2.length; i++) {
+                    Cell cell = headerRow.createCell(i);
+                    cell.setCellValue(columnHeaders2[i]);
+                }
+            }
+
+
+
+            String sheetName3 = "history";
+            String[] columnHeaders3 = {"用户名", "商品", "数量", "金额","购买时间"};
+            Sheet sheet3 = workbook.getSheet(sheetName3);
+            if (sheet3 == null) {
+                sheet3 = workbook.createSheet(sheetName3);
+                // 写入列头
+                Row headerRow = sheet3.createRow(0);
+                for (int i = 0; i < columnHeaders3.length; i++) {
+                    Cell cell = headerRow.createCell(i);
+                    cell.setCellValue(columnHeaders3[i]);
+                }
+            }
+
+
+
+            // 写入数据
+          //  Row dataRow = sheet.createRow(sheet.getLastRowNum() + 1);
+          //  DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+          //  dataRow.createCell(0).setCellValue("123");
+         //   dataRow.createCell(1).setCellValue("John Doe");
+         //   dataRow.createCell(2).setCellValue("password");
+         //   dataRow.createCell(3).setCellValue("普通用户");
+         //   dataRow.createCell(4).setCellValue("Silver");
+         //   dataRow.createCell(5).setCellValue(LocalDateTime.now().format(dtf));
+         //   dataRow.createCell(6).setCellValue(5000);
+          //  dataRow.createCell(7).setCellValue("1234567890");
+         //   dataRow.createCell(8).setCellValue("[email protected]");
+
+            // 保存Excel文件
+            FileOutputStream fileOut = new FileOutputStream(fileName);
+            workbook.write(fileOut);
+            fileOut.close();
+          //  System.out.println("Excel文件保存成功！");
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            if (workbook != null) {
+                try {
+                    workbook.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+}

系统开发excel/src/com/company/Main.java

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+package com.company;
+
+import org.apache.poi.ss.usermodel.*;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+
+import java.io.*;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+
+
+
+
+
+import static java.lang.System.exit;
+
+public class Main {
+
+    public static void main(String[] args) {
+        // write your code here
+
+        Excel f=new Excel();
+        f.create();
+
+
+        Start s=new Start();
+        s.start();
+
+    }
+
+}

系统开发excel/src/com/company/Start.java

@@ -0,0 +1,47 @@
+package com.company;
+
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+import static java.lang.System.exit;
+
+public class Start {
+
+    public void start(){
+
+        Scanner input = new Scanner(System.in);
+
+        User user=new User();
+        Administrator administrator=new Administrator();
+
+        boolean mis = true;
+
+
+        while (mis) {
+            try {
+                System.out.println("***************START***************");
+                System.out.print("请选择身份————1.管理员 2.用户  (按‘0’退出系统)>");
+                int choose = input.nextInt();
+
+                if (choose == 1) {
+                    administrator.administratorLogin();
+                    mis = false;
+                } else if (choose == 2) {
+                    user.userLogin();
+                    mis = false;
+                } else if (choose == 0) {
+                    System.exit(1);
+                } else {
+                    System.out.println("输入有误，请重新输入");
+                }
+            } catch (InputMismatchException e) {
+                System.out.println("输入有误，请重新输入");
+                input.nextLine(); // 清空输入缓冲区
+            }
+        }
+
+    }
+
+
+
+}