【工具】获取pojo类属性，并写入表格

1、添加依赖

  　　　 <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.9</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.9</version>
        </dependency>       

2、java代码

public class CreateExcel {

    static String fileName = "work1.xsl";

    /**
     * 读取domain文件的属性名和类型
     * @param object
     * @return
     */
    public static List<Map<String, String>> getDomainV(Object object){
        List<Map<String, String>> result = new ArrayList<Map<String,String>> ();
        Field[] fields = object.getClass().getDeclaredFields();
        for(int i=0;i<fields.length;i++){
            Map<String, String> map = new HashMap<String, String>();
            String attributeName = fields[i].getName();  //获取属性名称
            String attributeType = fields[i].getGenericType().toString(); //获取属性类型
            String[] types = attributeType.split("\\.");
            map.put("name", attributeName);
            map.put("type", types[types.length-1]);
            result.add(map);
        }
        return result;
    }

    /**
     * 生成表格
     * @param list
     * @throws IOException
     */
    public static void createWorkBook(List<Map<String, String>> list,String fileName) throws IOException {
            Workbook wb = new HSSFWorkbook();//创建excel工作簿
            Sheet sheet = wb.createSheet("new sheet"); //创建第一个sheet（页），命名为 new sheet 

            for(int i=0;i<list.size();i++){
                Row row = sheet.createRow(i); // 创建一行，在页sheet上
                Cell cell = row.createCell(0); // 在row行上创建一个方格
                cell.setCellValue(list.get(i).get("name")); //设置方格的显示
                cell = row.createCell(1);
                cell.setCellValue(list.get(i).get("type")); //
            }

            FileOutputStream fileOut = new FileOutputStream(fileName);
            wb.write(fileOut);
            fileOut.close();
        } 

    /**
    * 读取Excel表格
    * @param fileName
    * @throws Exception
    */
    public static void readWorkBook(String fileName) throws Exception {
        InputStream inp = new FileInputStream(fileName); 

        Workbook wb = WorkbookFactory.create(inp);
        Sheet sheet = wb.getSheetAt(0); 

        for (Row row : sheet) { //利用foreach循环 遍历sheet中的所有行
            for (Cell cell : row) { //遍历row中的所有方格
                System.out.print(cell.toString() + "  "); //输出方格中的内容，以空格间隔
            }
            System.out.println();   //每一个行输出之后换行
        }
        inp.close(); //关闭输入流
    } 

    public static void main(String[] args) throws Exception {
        Student stu = new Student();
        List<Map<String, String>> list = getDomainV(stu);
        createWorkBook(list,fileName);
        System.out.println("creat successful!");
        readWorkBook(fileName);
    } 

}