java实现excel表格上传和下载

需要导入excel相应的jar包

form表单需要加上enctype=”multipart/form-data”这个属性

    //封装上传文件对象
    private File userExcel;
    // 封装上传文件类型的属性
    private String userExcelContentType;
    // 封装上传文件名的属性
    private String userExcelFileName;

action中所需的字段

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8

action下载的方法

public String exportExcel() throws IOException{
        //1.查询用户
        List<User> userlist = userService.findObjects();
        //2.导出excel
        HttpServletResponse response = ServletActionContext.getResponse();
        response.setContentType("application/x-execl");
        response.setHeader("Content-Disposition", "attachment;filename=" + new String("用户列表.xls".getBytes(), "ISO-8859-1"));
        ServletOutputStream outputStream = response.getOutputStream();

        try {
            userService.exportExcel(userlist,outputStream);    //封装的工具类
        } catch (Exception e) {
            e.printStackTrace();
        }

        if(outputStream!=null){
            outputStream.close();
        }

        return null;
    }

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21

工具类

public class ExcelUtil {
    public static void exportExcelUsers(List<User> userlist,ServletOutputStream outputStream) throws Exception{
        //1.创建工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();

        // 1.1创建合并单元格
        CellRangeAddress cra = new CellRangeAddress(0, 0, 0, 6);

        // 1.2创建标题样式
        CellStyle style1 = createStyle(workbook, 16);
        // 1.3创建列标题样式
        CellStyle style2 = createStyle(workbook, 12);
        // 2.创建工作表
        Sheet sheet = workbook.createSheet("hello world");
        // 设置默认列宽
        sheet.setDefaultColumnWidth(15);
        // 2.1将合并单元格作用于sheet
        sheet.addMergedRegion(cra);
        // 3.创建行
        Row row = sheet.createRow(0);
        // 4.创建单元格
        Cell cell = row.createCell(0);
        // 5.向单元格写入数据
        cell.setCellValue("用户列表");
        // 6.将单元格加入样式
        cell.setCellStyle(style1);

        // 写列标题
        String[] titles = { "用户名", "帐号", "所属部门", "性别", "手机号码", "电子邮箱", "生日" };
        // 创建列标题行
        Row row2 = sheet.createRow(1);
        for (int i = 0; i < titles.length; i++) {
            // 创建单元格
            Cell cell1 = row2.createCell(i);
            // 向单元格写入数据
            cell1.setCellValue(titles[i]);
            // 将单元格加入样式
            cell1.setCellStyle(style2);
        }

        for (int i = 0; i < userlist.size(); i++) {
            User user = userlist.get(i);
            Row rowdata = sheet.createRow(i + 2);
            // 姓名
            Cell cell0 = rowdata.createCell(0);
            cell0.setCellValue(user.getName());
            // 账号
            Cell cell1 = rowdata.createCell(1);
            cell1.setCellValue(user.getAccount());
            // 部门
            Cell cell2 = rowdata.createCell(2);
            cell2.setCellValue(user.getDept());
            // 性别
            Cell cell3 = rowdata.createCell(3);
            cell3.setCellValue(user.isGender() ? "男" : "女");
            // 手机
            Cell cell4 = rowdata.createCell(4);
            cell4.setCellValue(user.getMobile());
            // 电邮
            Cell cell5 = rowdata.createCell(5);
            cell5.setCellValue(user.getEmail());
            // 生日
            Cell cell6 = rowdata.createCell(6);
            if(user.getBirthday()!=null){
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
                cell6.setCellValue(sdf.format(user.getBirthday()));
            }else{
                cell6.setCellValue("");
            }


        }

        // 6.写入硬盘文件
        workbook.write(outputStream);
        workbook.close();
    }


//设置样式方法
    public static CellStyle createStyle(Workbook workbook,int fontsize){
        //1.2设置单元格样式
        CellStyle style = workbook.createCellStyle();
        // 设置水平居中
        style.setAlignment(CellStyle.ALIGN_CENTER);
        // 设置垂直居中
        style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
        // 1.3设置字体
        Font font = workbook.createFont();
        // 设置字体为ARIAL
        font.setFontName(HSSFFont.FONT_ARIAL);
        // 设置粗体
        font.setBoldweight(Font.BOLDWEIGHT_BOLD);
        // 设置字体颜色
        //font.setColor(HSSFColor.BLUE.index);
        // 设置字体大小
        font.setFontHeightInPoints((short) fontsize);
        // 将字体加入样式
        style.setFont(font);
        return style;
    }

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• 51
• 52
• 53
• 54
• 55
• 56
• 57
• 58
• 59
• 60
• 61
• 62
• 63
• 64
• 65
• 66
• 67
• 68
• 69
• 70
• 71
• 72
• 73
• 74
• 75
• 76
• 77
• 78
• 79
• 80
• 81
• 82
• 83
• 84
• 85
• 86
• 87
• 88
• 89
• 90
• 91
• 92
• 93
• 94
• 95
• 96
• 97
• 98
• 99
• 100
• 101
• 102

excel上传方法

public String importExcel(){
        //先判断上传的文件是不是excel  
        if(userExcelFileName.matches("^.+\\.(?i)(xls|xlsx)$")){
            try {
                userService.importExcel(userExcel,userExcelFileName);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return "list";
    }


//dervice中的方法
public void importExcel(File userExcel, String userExcelFileName) throws Exception {
        FileInputStream fis = new FileInputStream(userExcel);
        boolean b = userExcelFileName.matches("^.+\\.xlsx$");
        //1.创建工作薄
                Workbook workbook = null;
                workbook=b?new XSSFWorkbook(fis):new HSSFWorkbook(fis);
                //2.获取工作表
                Sheet sheet = workbook.getSheetAt(0);
                int nums = sheet.getPhysicalNumberOfRows();
                System.out.println(nums);
                if(nums>2){
                    User user = null;
                    for(int i=2;i<nums;i++){
                        user = new User();
                        Row row = sheet.getRow(i);
                        //4.获取单元格
                        Cell namecell = row.getCell(0);
                        String name = namecell.getStringCellValue();
                        user.setName(name);

                        Cell accountcell = row.getCell(1);
                        String account = accountcell.getStringCellValue();
                        user.setAccount(account);

                        Cell deptcell = row.getCell(2);
                        String dept = deptcell.getStringCellValue();
                        user.setDept(dept);

                        Cell gendercell = row.getCell(3);
                        String gender = gendercell.getStringCellValue();
                        user.setGender(gender.equals("男"));

                        Cell mobilecell = row.getCell(4);
                        String mobile = null;
                        try {
                            mobile = mobilecell.getStringCellValue();
                        } catch (Exception e) {
                            mobile = BigDecimal.valueOf(mobilecell.getNumericCellValue()).toString();
                        }
                        user.setMobile(mobile);

                        Cell emailcell = row.getCell(5);
                        String email = emailcell.getStringCellValue();
                        user.setEmail(email);

                        Cell birthdaycell = row.getCell(6);
                        String birthday = birthdaycell.getStringCellValue();
                        if(birthday!=null){
                            SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
                            user.setBirthday(sdf.parse(birthday));
                        }

                        //设置用户状态
                        user.setState(User.USER_STATE_VALID);
                        //设置用户默认密码
                        user.setPassword("123456");

                        userDao.save(user);

                    }
                }
    }