Springboot/SpringMVC+POI 实现Excel导出功能(点击下载方式实现)

时间:2022-12-17 22:32:06
代码功能:

在前端jsp页面上有一个链接或按钮,单击之后进入Controller层的接口,然后弹出弹下载导出的Excel,最后将这个excel表格下载到客户端指定路径!

工具:IDEA

pom.xml添加依赖:

 

 
Controller层接口代码: 

 @RequestMapping("/download")
    public void downstudents(HttpServletRequest request, HttpServletResponse response,@RequestParam String startTime, @RequestParam String endTime)throws IOException
    {  //我这是根据前端传来的起始时间来查询数据库里的数据,如果没有输入变量要求,保留前两个就行
   
        String[] headers = { "ID", "主题", "姓名", "手机","创建时间","开始时间","结束时间"};//导出的Excel头部,这个要根据自己项目改一下
     
        List dataset = videoMeetInfoMapper.selectByTime(startTime,endTime);//查询出来的数据,根据自己项目改一下
        
		//下面的完全不动就行了(Excel数据中不包含图片)
		
        // 声明一个工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 生成一个表格
        HSSFSheet sheet = workbook.createSheet();
        // 设置表格默认列宽度为15个字节
        sheet.setDefaultColumnWidth((short) 18);
        HSSFRow row = sheet.createRow(0);
        for (short i = 0; i < headers.length; i++) {
            HSSFCell cell = row.createCell(i);
            HSSFRichTextString text = new HSSFRichTextString(headers[i]);
            cell.setCellValue(text);
        }
        //遍历集合数据,产生数据行
        Iterator it = dataset.iterator();
        int index = 0;
        while (it.hasNext()) {
            index++;
            row = sheet.createRow(index);
            demo t = (demo) it.next();
            //利用反射,根据javabean属性的先后顺序,动态调用getXxx()方法得到属性值
            Field[] fields = t.getClass().getDeclaredFields();
            for (short i = 0; i < fields.length; i++) {
                HSSFCell cell = row.createCell(i);
                Field field = fields[i];
                String fieldName = field.getName();
                String getMethodName = "get"
                        + fieldName.substring(0, 1).toUpperCase()
                        + fieldName.substring(1);
                try {
                    Class tCls = t.getClass();
                    Method getMethod = tCls.getMethod(getMethodName,
                            new Class[]{});
                    Object value = getMethod.invoke(t, new Object[]{});
                    String textValue = null;


                    if (value instanceof Date)
                    {
                        Date date = (Date) value;
                        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                        textValue = sdf.format(date);
                    }
                    else
                    {
                        //其它数据类型都当作字符串简单处理
                        textValue = value.toString();
                    }       
					
                            HSSFRichTextString richString = new HSSFRichTextString(textValue);
                            HSSFFont font3 = workbook.createFont();
                            font3.setColor(HSSFColor.BLUE.index);//定义Excel数据颜色
                            richString.applyFont(font3);
                            cell.setCellValue(richString);
                     
                } catch (SecurityException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (NoSuchMethodException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        response.setContentType("application/octet-stream");
        response.setHeader("Content-disposition", "attachment;filename=createList.xls");//默认Excel名称
        response.flushBuffer();
        workbook.write(response.getOutputStream());
    }
 

浏览器输入链接测试一下:
         localhost:8080/download?startTime=2017-07-26 8:57:59&endTime=2018-08-28 18:57:59(有无参数按项目情况而定)

 

显示截图如下,即可下载导出的Excel到客户端:


Springboot/SpringMVC+POI 实现Excel导出功能(点击下载方式实现)