Java实用工具

https://blog.csdn.net/qq_40981804/article/details/105166189

• excel 解析工具 poi

1. 导入excel解析所需要的jar包

        
            org.apache.poi
            poi
            3.8
        
        
            org.apache.poi
            poi-ooxml
            3.8
        

2. 结构

类名  说明
HSSFWorkbook    Excel的文档对象
HSSFSheet   Excel的表单
HSSFRow Excel的行
HSSFCell    Excel的格子单元
HSSFFont    Excel字体
HSSFDataFormat  格子单元的日期格式
HSSFHeader  Excel文档Sheet的页眉
HSSFFooter  Excel文档Sheet的页脚
HSSFCellStyle   格子单元样式
HSSFDateUtil    日期
HSSFPrintSetup  打印
HSSFErrorConstants  错误信息表

3. 代码

package com.document.exe;

import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.*;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * @author haizhuangbu
 * @Date
 * @function
 * @mark
 */
@Slf4j
public class ExUtil {

    @SneakyThrows
    public static void createEx() throws FileNotFoundException {
        String[] header = {"name", "age", "sex"};
        List data = new ArrayList();
        String[] da = {"1", "2", "3"};
        data.add(da);
        // 实例化
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 创建工作簿
        HSSFSheet sheet = workbook.createSheet("工作簿1");
        // create table header
        setTitle(workbook, sheet, header);
        // save data
        setData(sheet, data);
        File file1 = new File("name1.xls");
        if (file1.exists()) {
            file1.delete();
        }
        FileOutputStream file = new FileOutputStream("name1.xls");
        workbook.write(file);

    }

    // 创建表头
    public static void setTitle(HSSFWorkbook workbook, HSSFSheet sheet, String[] str) {
        // 表头  第一行
        HSSFRow row = sheet.createRow(0);
        // 设置行高列宽
        for (int i = 0; i < str.length; i++) {
            sheet.setColumnWidth(i, 15 * 256);
        }
        // 设置居中加粗 格式化日期
        HSSFCellStyle cellStyle = workbook.createCellStyle();
        // 设置字体
        HSSFFont font = workbook.createFont();
        // 设置字体大小
        font.setFontHeightInPoints((short) 11);
        // create font weight
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        // create font name
        font.setFontName("Courier New");
        // create auto /n
        cellStyle.setWrapText(true);
        cellStyle.setFont(font);
        cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/dyy h:mm"));
        // create table header
        for (int i = 0; i < str.length; i++) {
            HSSFCell cell = row.createCell(i);
            cell.setCellValue(str[i]);
            cell.setCellStyle(cellStyle);
        }
    }

    /**
     * 表格赋值
     */
    public static void setData(HSSFSheet sheet, List data) {

        for (int i = 0; i < data.size(); i++) {
            HSSFRow row = sheet.createRow(i + 1);
            for (int i1 = 0; i1 < data.get(i).length; i1++) {
                row.createCell(i1).setCellValue(data.get(i)[i1]);
            }
        }
    }

    public static void main(String[] args) throws FileNotFoundException {

        createEx();
    }


}