Java操作Excel之Poi

excel文档一般使用Apache的POI和JExcelAPI这两个工具来操作。这里我们使用POI实现读写excel文档。

<!-- 读取Excel表格包 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.14</version>
</dependency>

package com.communication.vo;

public class ExcelInfoVo {
private int num;
private String name;
private String sex;

public int getNum() {
return num;
}

public void setNum(int num) {
this.num = num;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getSex() {
return sex;
}

public void setSex(String sex) {
this.sex = sex;
}

@Override
public String toString() {
return "ExcelInfoVo{" +
"num=" + num +
", name='" + name + '\''+
",sex='" + sex + '\'' +
"}";
}

}

@RequestMapping("/readexcel")
public void readExcel() throws IOException {
List<ExcelInfoVo> list = importExcel("D:/t.xlsx",0);
System.out.println(list);
}
public List<ExcelInfoVo> importExcel(String file, int index) throws IOException {
FileInputStream in = null;
List<ExcelInfoVo> result = null;
try {
in = new FileInputStream(file);
result = new ArrayList<ExcelInfoVo>();
//创建07及之后版的工作簿
Workbook wb = new XSSFWorkbook(in);
/*创建07之前版本的工作簿
Workbook wb = new HSSFWorkbook(in);*/
//创建表单
Sheet sheet = wb.getSheetAt(index);
//遍历sheet里面的每一行
for(Row row : sheet) {
//第一行不是有效数据排除掉
if(row.getRowNum() < 1) {
continue;
}
ExcelInfoVo eInfo  = new ExcelInfoVo();
//这里要注意数据格式转换，Cell是单元格的意思，0,1,2代表的是第几列
eInfo.setNum(new Double(row.getCell(0).getNumericCellValue()).intValue());
/*
Java中将double转型为int有2个方法。
1.
double   d   =   12.0;
int   i   =   (new Double(d)).intValue();
2.
double   d   =   12.0;
int   i   =   (int)d;
不要使用(int)来强制转换 （原因待查）
*/
eInfo.setName(row.getCell(1).getStringCellValue());
eInfo.setSex(row.getCell(2).getStringCellValue());
result.add(eInfo);
}
} catch(Exception e) {
e.printStackTrace();
} finally {
in.close();
}
return result;
}

@RequestMapping("/writeExcel")
public void writeExcel() {
OutputStream fos = null;
//1.创建工作簿
Workbook wb = new XSSFWorkbook();
try {
//2.创建sheet，并设置列宽
Sheet sheet = wb.createSheet("名单");
sheet.setColumnWidth(0, 18*256);
sheet.setColumnWidth(1, 18*256);
sheet.setColumnWidth(2, 18*256);
//创建Row为单元格赋值
Row row = sheet.createRow(0);
row.createCell(0).setCellValue(0);;
row.createCell(1).setCellValue("陈茵");
row.createCell(2).setCellValue("女");
//将工作簿里的内容写入Excle文件中
fos = new FileOutputStream("D:/1.xlsx");
wb.write(fos);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}