【java】使用mysql+java绘制Excel二维表格

矫情吗；* 2022-07-12 12:43 195阅读 0赞

## 本文是使用java语言对于后台的数据进行绘制，由于所用到的表格的长度较长，直接使用.xlsx后缀的Excel表 ##

1、首先要导入数据库的jar包，以及读取excel的jar包

2、  
`public static void main(String[] args) throws Exception{ String fileName = "C:\\分词\\test.xlsx"; Test upload = new Test(); upload.getExcelData(fileName,".xlsx"); }`

3、判断excel版本

//判断excel版本
    static Workbook openWorkbook(InputStream in,String filename,String fileFileName)throws IOException{
    
        Workbook wb = null;
        if(fileFileName.endsWith(".xlsx")){
    
            wb = new XSSFWorkbook(in);//Excel 2007
        } else {
    
            wb = (Workbook) new HSSFWorkbook(in);//Excel 2003
    
        }
        return wb;
    }

4、

public static void getExcelData(String fileName,String fileFileName) throws Exception {
        OutputStream out = null;
        InputStream in = new FileInputStream(fileName); //创建输入流
        Workbook wb = openWorkbook(in, fileName,fileFileName);// 获取Excel文件对象
        Sheet sheet = wb.getSheetAt(0);// 获取文件的指定工作表m 默认的第一个
        out =  new FileOutputStream(fileName);

5、

System.out.println("===========正在导入横坐标============");
        String sql = null;
        DBHelper db1;
        ResultSet ret = null;
        sql = "select * from table ";//SQL语句
        db1 = new DBHelper(sql);//创建DBHelper对象
        ret = db1.pst.executeQuery();//执行语句，得到结果集
        int xLocation = 1;
        Row row0 = sheet.createRow(0);
        while (ret.next()) {
            Cell first0 = row0.createCell(xLocation);
            String keyword = ret.getString(2);
            first0.setCellValue(keyword);
            xLocation ++ ;
        }
        db1.close();
        ret.close();

6、

System.out.println("==========正在导入纵坐标=======");
        DBHelper dbY;
        ResultSet retY = null;
        String sqlY = "select distinct paperid from co_word_ty ";//SQL语句
        dbY = new DBHelper(sqlY);//创建DBHelper对象
        retY = dbY.pst.executeQuery();//执行语句，得到结果集
       // out =  new FileOutputStream(fileName);
        int yLocation = 1;
        while (retY.next()) {
            Row rowY = sheet.createRow(yLocation);
            Cell fristY = rowY.createCell(0);
            String paperid = retY.getString(1);
            fristY.setCellValue(paperid);
            yLocation ++;
        }
        dbY.close();
        retY.close();

7、

/*
         * 
         * 初始化数据表
         */
        /*System.out.println("==================正在初始化表格=================");
        int rowNumber = sheet.getLastRowNum();
        for(int i = 1;i <= rowNumber;i++){
            Row rowXY = sheet.getRow(i);
            int cellNumber = rowXY.getLastCellNum();
            for(int j=1;j<= xLocation-1;j++){
                System.out.println(j);
                Cell fristXY = rowXY.createCell(j);
    
                fristXY.setCellValue(0);
            }
    
        }*/

8、

/* * * 填充数据 */
        System.out.println("==================正在输出数据=================");
        DBHelper dbXYData;
        ResultSet retXYData = null;
        String sqlXYData = "select locationX,locationY from co_word_ty ";//SQL语句
        dbXYData = new DBHelper(sqlXYData);
        retXYData = dbXYData.pst.executeQuery();
        while (retXYData.next()) {
            String x = retXYData.getString(1);
            String y = retXYData.getString(2);
    
            //System.out.println(x);
            if(x != null && x != ""){
                System.out.println(Integer.parseInt(x)+"======================="+Integer.parseInt(y));
                Row rowXYData = sheet.getRow(Integer.parseInt(y));
                Cell fristXYData = rowXYData.createCell(Integer.parseInt(x));
                fristXYData.setCellValue(1);
            }
    
        }
        dbXYData.close();
        retXYData.close();
    
    
        wb.write(out); 
        System.out.println("=====================done===================");