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 ity.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;
}
java的tostring方法/
/ 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 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 = ateSheet();
// 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 = ateRow(rowNum);
for (int cellNum = 0; cellNum < keys.size(); cellNum++) {
// 创建列
HSSFCell cell = ateCell(cellNum);
// 标题
if (rowNum == 0) {
cell.setCellStyle(headStyle);
cell.((cellNum)));
} else { // 内容
cell.setCellStyle(bodyStyle);
// 通过反射获取
cell.(cellNum), (rowNum - 1)));    }
}
}
return workbook;
}
/**
* ⽣成样式
* @param workbook
* @param size
* @return
*/
public static HSSFCellStyle creatStyle(HSSFWorkbook workbook, short size) {  HSSFCellStyle style = ateCellStyle();
style.setAlignment((HSSFCellStyle.ALIGN_CENTER));
style.setVerticalAlignment((HSSFCellStyle.VERTICAL_CENTER));
HSSFFont font = ateFont();
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 util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.ReflectionUtils;
import java.beans.PropertyDescriptor;
import flect.Method;
/
**
* 反射⼯具包
*
* @author: ⼩⾠哥哥
*/
public class ReflectUtil {
private static final Logger logger = Logger(ReflectUtil.class); public static String getValue(String key, Object obj) {
String value = "";
try {
// 获取当前属性
PropertyDescriptor pd = new PropertyDescriptor(key, Class());
// 获取get⽅法
Method getMd = pd.getReadMethod();
value = getMd.invoke(obj).toString();
} catch (Exception e) {
<("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, Class());
// 获取set⽅法
Method writeMd = pd.getWriteMethod();
writeMd.invoke(obj, value);
} catch (Exception e) {
<("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 = atExcel(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 Bytes("gb2312"),
"ISO-8859-1") + ".xls");
OutputStream outputStream = OutputStream();
hssfWorkbook.write(outputStream);
outputStream.flush();
outputStream.close();
}
5.访问映射地址
接⼝访问：
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