使用hutools 生成excel

一.引入依赖

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.8.3</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.2</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>4.1.2</version>
</dependency>

二.代码

import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

@Data
public class User {

    
    @ApiModelProperty(value = "用户ID")
    private String id;
    
    @ApiModelProperty(value = "用户名称")
    private String name;
    
    @ApiModelProperty(value = "用户年龄")
    private Integer age;
    
    @ApiModelProperty(value = "用户邮箱")
    private String email;
}
 private void writeExcel(List<CarVdnEntity> excelList) {
        log.info("CarVdnServiceImpl.writeExcel.excelList.size:", excelList.size());
        LinkedList<String> headerList = new LinkedList<>();
        //生成文件路径 windows 环境可以写成("D://file//")
        ExcelWriter writer = ExcelUtil.getWriter("GBOM-" + (LocalDate.now().toString()));
        addHeaderAlias(writer, headerList);
        writer.writeHeadRow(headerList);
        //一次性写出内容,强制输出标题
        writer.write(excelList);
        //关闭writer,释放内存
        writer.close();
    }

    private static String convertToUnderscore(String camelCase) {
        // 使用正则表达式将大写字母前面添加下划线,并转换为小写
        String underscore = camelCase.replaceAll("([A-Z])", "_$1").toLowerCase();
        // 如果开头有下划线,则去除开头的下划线
        if (underscore.startsWith("_")) {
            underscore = underscore.substring(1);
        }
        return underscore;
    }

    private static void addHeaderAlias(ExcelWriter writer, LinkedList<String> header) {
        Class<?> clazz = User.class;
        Field[] fields = clazz.getDeclaredFields();
        // 遍历字段数组,获取每个字段的名称并添加到列表中
        for (Field field : fields) {
            String fieldName = field.getName();
            header.add(convertToUnderscore(fieldName));
            writer.addHeaderAlias(fieldName, convertToUnderscore(fieldName));
        }
    }

 测试类:

        LocalDateTime startOfDay = LocalDate.now().atStartOfDay();
        // 结果集合
        List<User> excelList = new ArrayList<>();
        excelList.add(new User("1","张三",20,"zhangsan@163.com"));
        //写入excel
        writeExcel(excelList);

使用Hutools导出Excel需要先添加Hutools依赖,可以在Maven中添加以下依赖: ```xml <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.7.5</version> </dependency> ``` 接下来,按照以下步骤使用Hutools导出Excel: 1. 创建ExcelWriter对象: ```java ExcelWriter writer = ExcelUtil.getWriter("d:/test.xlsx"); ``` 2. 写入表头: ```java // 写入表头 writer.addHeaderAlias("name", "姓名"); writer.addHeaderAlias("age", "年龄"); writer.addHeaderAlias("gender", "性别"); ``` 3. 写入数据: ```java // 写入数据 List<Map<String, Object>> rows = new ArrayList<>(); Map<String, Object> row1 = new LinkedHashMap<>(); row1.put("name", "张三"); row1.put("age", 20); row1.put("gender", "男"); rows.add(row1); Map<String, Object> row2 = new LinkedHashMap<>(); row2.put("name", "李四"); row2.put("age", 25); row2.put("gender", "女"); rows.add(row2); writer.write(rows); ``` 4. 关闭ExcelWriter: ```java writer.close(); ``` 完整代码示例: ```java import cn.hutool.poi.excel.ExcelUtil; import cn.hutool.poi.excel.ExcelWriter; import java.util.ArrayList; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; public class ExportExcelDemo { public static void main(String[] args) { // 创建ExcelWriter对象 ExcelWriter writer = ExcelUtil.getWriter("d:/test.xlsx"); // 写入表头 writer.addHeaderAlias("name", "姓名"); writer.addHeaderAlias("age", "年龄"); writer.addHeaderAlias("gender", "性别"); // 写入数据 List<Map<String, Object>> rows = new ArrayList<>(); Map<String, Object> row1 = new LinkedHashMap<>(); row1.put("name", "张三"); row1.put("age", 20); row1.put("gender", "男"); rows.add(row1); Map<String, Object> row2 = new LinkedHashMap<>(); row2.put("name", "李四"); row2.put("age", 25); row2.put("gender", "女"); rows.add(row2); writer.write(rows); // 关闭ExcelWriter writer.close(); } } ```
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