POI 生成表格通用方法

import java.util.Collection;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class ExcelExportServiceImpl implements ExcelExportService {

@Autowired
HttpServletResponse response;

[@Override](https://my.oschina.net/u/1162528)
public <T> void excelData(String title, String[] headers, String[] colums, Collection<T> dataset)
throws Exception {
ExcelUtils.exportExcelData(title, headers, colums, dataset,response);
response.setCharacterEncoding("UTF-8");
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; charset=UTF-8");

}

import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelUtils {
private static String getName = "get";

private static String dataFormat = "yyyy-MM-dd";

public static <T> void exportExcelData(String title, String[] headers, String[] colums, Collection<T> dataset,HttpServletResponse response)
throws Exception {
XSSFWorkbook workBook = null;

try {
// 创建一个workbook 对应一个excel应用文件
workBook = new XSSFWorkbook();
// 在workbook中添加一个sheet,对应Excel文件中的sheet
XSSFSheet sheet = workBook.createSheet(title);
// 设置表格默认列宽度为15个字节
sheet.setDefaultColumnWidth((short) 15);

// 构建表头
XSSFRow headRow = sheet.createRow(0);
XSSFCell cell = null;
for (int i = 0; i < headers.length; i++) {
cell = headRow.createCell(i);
XSSFRichTextString text = new XSSFRichTextString(headers[i]);
cell.setCellValue(text);
}

// 构建表体数据
Iterator<T> it = dataset.iterator();
int index = 0;
while (it.hasNext()) {
index++;
XSSFRow bodyRow = sheet.createRow(index);
T t = (T) it.next();

for (int i = 0; i < colums.length; i++) {
cell = bodyRow.createCell(i);

String fieldName = colums[i];
String getMethodName = getName + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);

Class<? extends Object> tCls = t.getClass();
Method getMethod = tCls.getMethod(getMethodName, new Class[] {});
Object value = getMethod.invoke(t, new Object[] {});

String textValue = null;
if (value instanceof Date) {
Date date = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(dataFormat);
textValue = sdf.format(date);
} else if (value != null) {
// 其它数据类型都当作字符串简单处理
textValue = value.toString();
} else {
textValue = " ";
}

cell.setCellValue(textValue);
}
}

workBook.write(response.getOutputStream());
} finally {
if (workBook != null) {
workBook.close();
}
}
}

}