spring mvc 导出Excel

一、pom.xml引入jar包
   

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.9</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.9</version>
        </dependency>
    

二、加入Excel工具类ExcelUtils.java
   

import java.io.IOException;
import java.lang.reflect.Field;
import java.util.List;

import javax.servlet.ServletOutputStream;

import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelUtil {

    public static void exportExcel(List<Object> list,String sheetName, String[] titles, ServletOutputStream outputStream) {
        // 创建一个workbook 对应一个excel应用文件  
        XSSFWorkbook workBook = new XSSFWorkbook();
        // 在workbook中添加一个sheet,对应Excel文件中的sheet  
        XSSFSheet sheet = workBook.createSheet(sheetName);
        XSSFCellStyle headStyle = getHeadStyle(workBook);
        XSSFCellStyle bodyStyle = getBodyStyle(workBook);
        // 构建表头  
        XSSFRow headRow = sheet.createRow(0);
        XSSFCell cell = null;
        for (int i = 0 ; i < titles.length; i++) {
            cell = headRow.createCell(i);
            cell.setCellStyle(headStyle);
            cell.setCellValue(titles[i]);
        }
        // 构建表体数据  
        if (list != null && list.size() > 0) {
            for (int j = 0 ; j < list.size() ; j++) {
                XSSFRow bodyRow = sheet.createRow(j + 1);
                Class<? extends Object> bean = list.get(j).getClass(); //获取对象
                /* 
                 * 得到类中的所有属性集合 
                 */
                Field[] fs = bean.getDeclaredFields();
                for (int i = 0 ; i < fs.length ; i++) {
                    Field field = fs[i];
                    field.setAccessible(true); //设置些属性是可以访问的  
                    try {
                        cell = bodyRow.createCell(i);
                        cell.setCellStyle(bodyStyle);
                        cell.setCellValue((String)FieldsUtils.invokeMethod(list.get(j), field.getName()));//得到此属性的值   
                    }catch (Exception e) {
                    }
                }
            }
        }
        try {
            workBook.write(outputStream);
            outputStream.flush();
            outputStream.close();
        }catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                outputStream.close();
            }
            catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

    /** 
     * 合并单元格后给合并后的单元格加边框 
     *  
     * @param region 
     * @param cs 
     */
    public static void setRegionStyle(CellRangeAddress region, XSSFCellStyle cs, XSSFSheet sheet) {

        int toprowNum = region.getFirstRow();
        for (int i = toprowNum ; i <= region.getLastRow() ; i++) {
            XSSFRow row = sheet.getRow(i);
            for (int j = region.getFirstColumn() ; j <= region.getLastColumn() ; j++) {
                XSSFCell cell = row.getCell(j);
                cell.setCellStyle(cs);
            }
        }
    }

    /** 
     * 设置表头的单元格样式 
     *  
     * @return 
     */
    public static XSSFCellStyle getHeadStyle(XSSFWorkbook wb) {
        // 创建单元格样式  
        XSSFCellStyle cellStyle = wb.createCellStyle();
        // 设置单元格的背景颜色为淡蓝色  
        cellStyle.setFillForegroundColor(HSSFColor.PALE_BLUE.index);
        cellStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
        // 设置单元格居中对齐  
        cellStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        // 设置单元格垂直居中对齐  
        cellStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        // 创建单元格内容显示不下时自动换行  
        cellStyle.setWrapText(true);
        // 设置单元格字体样式  
        XSSFFont font = wb.createFont();
        // 设置字体加粗  
        font.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
        font.setFontName("宋体");
        font.setFontHeight((short) 200);
        cellStyle.setFont(font);
        // 设置单元格边框为细线条  
        cellStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderRight(XSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);
        return cellStyle;
    }

    /** 
     * 设置表体的单元格样式 
     *  
     * @return 
     */
    public static XSSFCellStyle getBodyStyle(XSSFWorkbook wb) {
        // 创建单元格样式  
        XSSFCellStyle cellStyle = wb.createCellStyle();
        // 设置单元格居中对齐  
        cellStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        // 设置单元格垂直居中对齐  
        cellStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        // 创建单元格内容显示不下时自动换行  
        cellStyle.setWrapText(true);
        // 设置单元格字体样式  
        XSSFFont font = wb.createFont();
        // 设置字体加粗  
        font.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
        font.setFontName("宋体");
        font.setFontHeight((short) 100);
        cellStyle.setFont(font);
        // 设置单元格边框为细线条  
        cellStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderRight(XSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);
        return cellStyle;
    }
}

    

再加入FieldUtils.java，根据model中的列名获取对应的value

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;


public class FieldsUtils {

    /**
     * @param object
     * @return
     * @throws SecurityException
     * @throws IllegalArgumentException
     * @throws NoSuchMethodException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static Map<String, Object> getFileds(Object object) throws SecurityException, IllegalArgumentException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        Class<?> clazz = object.getClass();
        Field[] fields = clazz.getDeclaredFields();
        Map<String, Object> map = new HashMap<String, Object>();

        for (int i = 0 ; i < fields.length ; i++) {
            Object resultObject = invokeMethod(object, fields[i].getName());
            map.put(fields[i].getName(), resultObject);
        }

        return map;
    }

    /**
     * 根据列名获取值
     */
    public static Object invokeMethod(Object owner, String fieldname){
        Object object = null;
        try {
            Class<?> ownerClass = owner.getClass();
            Method method = null;
            method = ownerClass.getMethod("get" + captureName(fieldname));
            object = method.invoke(owner);
        }catch (Exception e) {
        }
        return object;
    }

    /**
     * 首字母大写
     * @param name
     * @return
     */
    public static String captureName(String name) {
        //     name = name.substring(0, 1).toUpperCase() + name.substring(1);
        //             return  name;
        char[] cs = name.toCharArray();
        cs[0] -= 32;
        return String.valueOf(cs);

    }
}

Controller中对应的代码

/**
     * excel导出
     * @param request
     * @return
     * @throws IOException 
     */
    @RequestMapping(value = "/export.json")
    public String export(HttpServletRequest request,HttpServletResponse response) throws IOException {
        String fileName = new String(("Excel导出示例").getBytes(), "ISO8859_1");  
        response.setHeader("Content-disposition", "attachment; filename=" + fileName + ".xlsx");// 组装附件名称和格式  
        ServletOutputStream outputStream = response.getOutputStream();  
        String sheetName = "Excel导出示例列表";
        List<Object> list = new ArrayList<Object>();
        String[] titles = {"测试字段1","测试字段2","测试字段3".......};
        ExcelEntity excelEntity = null;
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        for(Object bean : rows){
            excelEntity = new ExcelEntity();
            ...
            excelEntity.setCreateDate(dateFormat.format(bean.getCreateDate()));
            list.add(excelEntity);
        }
        ExcelUtil.exportExcel(list,sheetName, titles, outputStream);
        return null;
    }
    

js中应该这样写

window.location.href="${path}/export.do";