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javapoi简单代码(Java使用Apache.POI中HSSFWorkbook导出到Excel的实现方法)

时间:2021-10-14 00:29:21类别:服务器

javapoi简单代码

Java使用Apache.POI中HSSFWorkbook导出到Excel的实现方法

使用Apache.POI中HSSFWorkbook导出到Excel,具体内容如下所示:

1.引入Poi依赖(3.12)

依赖如下:

  • <dependency>
       <groupId>org.apache.poi</groupId>
       <artifactId>poi</artifactId>
       <version>3.12</version>
    </dependency>
    
  • 2.创建实体类(User.java)

  • package com.kd.nm.entity.pojo;
    
    /**
     * 实体类(User)
     *
     * author 小辰哥哥
     */
    public class User {
     // 用户编号
     private String userNo;
     // 用户名称
     private String userName;
     // 年龄
     private String age;
    
     // 无参构造
     public User() {
     }
    
     // 有参构造
     public User(String userNo, String userName, String age) {
      this.userNo = userNo;
      this.userName = userName;
      this.age = age;
     }
    
     // get与set方法进行封装
     public String getUserNo() {
      return userNo;
     }
    
     public void setUserNo(String userNo) {
      this.userNo = userNo;
     }
    
     public String getUserName() {
      return userName;
     }
    
     public void setUserName(String userName) {
      this.userName = userName;
     }
    
     public String getAge() {
      return age;
     }
    
     public void setAge(String age) {
      this.age = age;
     }
    
     // 重新toString方法
     @Override
     public String toString() {
      return "User{" +
        "userNo='" + userNo + '\'' +
        ", userName='" + userName + '\'' +
        ", age='" + age + '\'' +
        '}';
     }
    }
    
  • 3.Excel相关工具类(ExcelUtil、ReflectUtil)

  • package com.kd.nm.util;
    
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Map;
    import org.apache.poi.hssf.usermodel.*;
    
    /**
     * Description : Excel相关工具类
     *
     * @author: 小辰哥哥
     *
     */
    public class ExcelUtil {
    
     /**
      * 生成excel表格
      * @param heads 表头内容
      * @param data 数据内容
      * @return
      */
     public static HSSFWorkbook creatExcel(Map<String, String> heads, List data) {
    
      // 声明一个工作薄
      HSSFWorkbook workbook = new HSSFWorkbook();
      // 生成一个表格
      HSSFSheet sheet = workbook.createSheet();
    
      // 生成标题行样式
      HSSFCellStyle headStyle = creatStyle(workbook, (short) 14);
    
      // 生成表格内容样式
      HSSFCellStyle bodyStyle = creatStyle(workbook, (short) 10);
    
      // 标题元素
      List<String> keys = new ArrayList<String>(heads.keySet());
    
      // 像素单位
      short px = 1000;
      // 设置列宽
      for (int columnIndex = 0; columnIndex < keys.size(); columnIndex++) {
    
       sheet.setColumnWidth(columnIndex, 6 * px);
      }
    
      // 生成表格
      for (int rowNum = 0; rowNum <= data.size(); rowNum++) {
    
       // 创建行
       HSSFRow row = sheet.createRow(rowNum);
    
       for (int cellNum = 0; cellNum < keys.size(); cellNum++) {
    
        // 创建列
        HSSFCell cell = row.createCell(cellNum);
    
        // 标题
        if (rowNum == 0) {
    
         cell.setCellStyle(headStyle);
         cell.setCellValue(heads.get(keys.get(cellNum)));
        } else { // 内容
    
         cell.setCellStyle(bodyStyle);
         // 通过反射获取
         cell.setCellValue(ReflectUtil.getValue(keys.get(cellNum), data.get(rowNum - 1)));
        }
       }
      }
    
      return workbook;
     }
    
     /**
      * 生成样式
      * @param workbook
      * @param size
      * @return
      */
     public static HSSFCellStyle creatStyle(HSSFWorkbook workbook, short size) {
    
      HSSFCellStyle style = workbook.createCellStyle();
      style.setAlignment((HSSFCellStyle.ALIGN_CENTER));
      style.setVerticalAlignment((HSSFCellStyle.VERTICAL_CENTER));
      HSSFFont font = workbook.createFont();
      font.setFontHeightInPoints(size);
      font.setFontName("微软雅黑");
      style.setFont(font);
      style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
      style.setBorderTop(HSSFCellStyle.BORDER_THIN);
      style.setBorderRight(HSSFCellStyle.BORDER_THIN);
      style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
    
      return style;
     }
    }
    
  • package com.kd.nm.util;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.util.ReflectionUtils;
    import java.beans.PropertyDescriptor;
    import java.lang.reflect.Method;
    
    /**
     * 反射工具包
     *
     * @author: 小辰哥哥
     */
    public class ReflectUtil {
    
     private static final Logger logger = LoggerFactory.getLogger(ReflectUtil.class);
    
     public static String getValue(String key, Object obj) {
    
      String value = "";
    
      try {
    
       // 获取当前属性
       PropertyDescriptor pd = new PropertyDescriptor(key, obj.getClass());
       // 获取get方法
       Method getMd = pd.getReadMethod();
       value = getMd.invoke(obj).toString();
      } catch (Exception e) {
    
       logger.error("获取内容失败!");
       e.printStackTrace();
      }
    
      return value;
     }
    
     public static void setValue(String key, String value, Object obj) {
    
      try {
    
       // 获取当前属性
       PropertyDescriptor pd = new PropertyDescriptor(key, obj.getClass());
       // 获取set方法
       Method writeMd = pd.getWriteMethod();
       writeMd.invoke(obj, value);
      } catch (Exception e) {
    
       logger.error("设置内容失败!");
       e.printStackTrace();
      }
     }
    }
    
  • 4.后端控制器代码

  • @RequestMapping(value = "/exportExcel",method = RequestMethod.GET,produces = "application/json")
     public void exportExcel(HttpServletResponse httpServletResponse) throws IOException {
    
      // 表头内容(可在前端设置,通过参数传递进来) Key是实体类的属性值,value是表头的lable
      Map<String,String> head = new HashMap<>();
      head.put("userNo","用户编号");
      head.put("userName","用户名称");
      head.put("age","年龄");
    
      // 表格数据内容,模拟数据库查询出来的数据
      List<User> data = new ArrayList<>();
      data.add(new User("1","小辰哥哥","18"));
      data.add(new User("2","小猪妹妹","18"));
      data.add(new User("3","大猪哥哥","18"));
      
      
      // 生成工作薄
      HSSFWorkbook hssfWorkbook = ExcelUtil.creatExcel(head, data);
    
      // 定义文件名
      String fileName = "导出Excel表格";
    
      httpServletResponse.setHeader("Cache-Control", "max-age=0");
      httpServletResponse.setContentType("application/vnd.ms-excel");
      httpServletResponse.addHeader("Content-disposition", "attachment;filename=" + new String(fileName.getBytes("gb2312"),
        "ISO-8859-1") + ".xls");
    
      OutputStream outputStream = httpServletResponse.getOutputStream();
    
      hssfWorkbook.write(outputStream);
      outputStream.flush();
      outputStream.close();
     }
    
  • 5.访问映射地址

    接口访问:

    http://localhost:9090/FaultTreatment/api/standard/exportExcel

    javapoi简单代码(Java使用Apache.POI中HSSFWorkbook导出到Excel的实现方法)
    javapoi简单代码(Java使用Apache.POI中HSSFWorkbook导出到Excel的实现方法)

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