Java POI实现导出excel

本文转载，若有任何对原版不利，可随时删除。

一、maven引入jar包

        <!-- 导出 -->
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi</artifactId>
        <version>3.12</version><!--3.16  -->
    </dependency>
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-examples</artifactId>
        <version>3.9</version>
    </dependency>
     <dependency>  
        <groupId>org.apache.poi</groupId>  
        <artifactId>poi-excelant</artifactId>  
        <version>3.9</version>  
    </dependency>

二、工具类

package com.chinacoal.asset.utils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;  

public class PoiExcelExport {
    HttpServletResponse response;  
    // 文件名  
    private String fileName ;  
    //文件保存路径  
    private String fileDir;  
    //sheet名  
    private String sheetName;  
    //表头字体  
    private String titleFontType = "Arial Unicode MS";  
    //表头背景色  
    private String titleBackColor = "C1FBEE";  
    //表头字号  
    private short titleFontSize = 12;  
    //添加自动筛选的列 如 A:M  
    private String address = "";  
    //正文字体  
    private String contentFontType = "Arial Unicode MS";  
    //正文字号  
    private short contentFontSize = 12;  
    //Float类型数据小数位  
    private String floatDecimal = ".00";  
    //Double类型数据小数位  
    private String doubleDecimal = ".00";  
    //设置列的公式  
    private String colFormula[] = null;  

    DecimalFormat floatDecimalFormat=new DecimalFormat(floatDecimal);  
    DecimalFormat doubleDecimalFormat=new DecimalFormat(doubleDecimal);  

    private HSSFWorkbook workbook = null;  

    public PoiExcelExport(String fileDir,String sheetName){  
         this.fileDir = fileDir;  
         this.sheetName = sheetName;  
         workbook = new HSSFWorkbook();  
    }  

    public PoiExcelExport(HttpServletResponse response,String fileName,String sheetName){  
         this.response = response;  
         this.sheetName = sheetName;  
         this.fileName = fileName;
         workbook = new HSSFWorkbook();  
    }  
    /** 
     * 设置表头字体. 
     * @param titleFontType 
     */  
    public void setTitleFontType(String titleFontType) {  
        this.titleFontType = titleFontType;  
    }  
    /** 
     * 设置表头背景色. 
     * @param titleBackColor 十六进制 
     */  
    public void setTitleBackColor(String titleBackColor) {  
        this.titleBackColor = titleBackColor;  
    }  
    /** 
     * 设置表头字体大小. 
     * @param titleFontSize 
     */  
    public void setTitleFontSize(short titleFontSize) {  
        this.titleFontSize = titleFontSize;  
    }  
    /** 
     * 设置表头自动筛选栏位,如A:AC. 
     * @param address 
     */  
    public void setAddress(String address) {  
        this.address = address;  
    }  
    /** 
     * 设置正文字体. 
     * @param contentFontType 
     */  
    public void setContentFontType(String contentFontType) {  
        this.contentFontType = contentFontType;  
    }  
    /** 
     * 设置正文字号. 
     * @param contentFontSize 
     */  
    public void setContentFontSize(short contentFontSize) {  
        this.contentFontSize = contentFontSize;  
    }  
    /** 
     * 设置float类型数据小数位 默认.00 
     * @param doubleDecimal 如 ".00" 
     */  
    public void setDoubleDecimal(String doubleDecimal) {  
        this.doubleDecimal = doubleDecimal;  
    }  
    /** 
     * 设置doubel类型数据小数位 默认.00 
     * @param floatDecimalFormat 如 ".00 
     */  
    public void setFloatDecimalFormat(DecimalFormat floatDecimalFormat) {  
        this.floatDecimalFormat = floatDecimalFormat;  
    }  
    /** 
     * 设置列的公式  
     * @param colFormula  存储i-1列的公式 涉及到的行号使用@替换 如A@+B@ 
     */  
    public void setColFormula(String[] colFormula) {  
        this.colFormula = colFormula;  
    }  
    /** 
     * 写excel. 
     * @param titleColumn  对应bean的属性名 
     * @param titleName   excel要导出的表名 
     * @param titleSize   列宽 
     * @param dataList  数据 
     */  
    public void wirteExcel(String titleColumn[],String titleName[],int titleSize[],List<?> dataList){  
        //添加Worksheet（不添加sheet时生成的xls文件打开时会报错)  
        Sheet sheet = workbook.createSheet(this.sheetName);  

        //新建文件  
        OutputStream out = null;  
        try {      
            if(fileDir!=null){  
                //有文件路径  
                out = new FileOutputStream(fileDir);                  
            }else{  


                //否则，直接写到输出流中  
                out = response.getOutputStream();  
                fileName = fileName+".xls";  
                response.setContentType("application/x-msdownload");  
                response.setHeader("Content-Disposition", "attachment; filename="  
                        + URLEncoder.encode(fileName, "UTF-8"));  
            }  

            //写入excel的表头  
            Row titleNameRow = workbook.getSheet(sheetName).createRow(0);   
            //设置样式  
            HSSFCellStyle titleStyle = workbook.createCellStyle();    
            titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, titleFontType, (short) titleFontSize);  
            titleStyle = (HSSFCellStyle) setColor(titleStyle, titleBackColor, (short)10);  

            for(int i = 0;i < titleName.length;i++){  
                sheet.setColumnWidth(i, titleSize[i]*256);    //设置宽度          
                Cell cell = titleNameRow.createCell(i);  
                cell.setCellStyle(titleStyle);  
                cell.setCellValue(titleName[i].toString());  
            }  

            //为表头添加自动筛选  
            if(!"".equals(address)){  
                CellRangeAddress c = (CellRangeAddress) CellRangeAddress.valueOf(address);  
                sheet.setAutoFilter(c);  
            }  

            //通过反射获取数据并写入到excel中  
            if(dataList!=null&&dataList.size()>0){  
                //设置样式  
                HSSFCellStyle dataStyle = workbook.createCellStyle();    
                titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, contentFontType, (short) contentFontSize);  

                if(titleColumn.length>0){  
                    for(int rowIndex = 1;rowIndex<=dataList.size();rowIndex++){  
                        Object obj = dataList.get(rowIndex-1);     //获得该对象  
                        Class clsss = obj.getClass();     //获得该对对象的class实例  
                        Row dataRow = workbook.getSheet(sheetName).createRow(rowIndex);      
                        for(int columnIndex = 0;columnIndex<titleColumn.length;columnIndex++){  
                            String title = titleColumn[columnIndex].toString().trim();  
                            if(!"".equals(title)){  //字段不为空  
                                //使首字母大写  
                                String UTitle = Character.toUpperCase(title.charAt(0))+ title.substring(1, title.length()); // 使其首字母大写;  
                                String methodName  = "get"+UTitle;  

                                // 设置要执行的方法  
                                Method method = clsss.getDeclaredMethod(methodName);   

                                //获取返回类型  
                                String returnType = method.getReturnType().getName();   

                                String data = method.invoke(obj)==null?"":method.invoke(obj).toString();  
                                Cell cell = dataRow.createCell(columnIndex);  
                                if(data!=null&&!"".equals(data)){  
                                    if("int".equals(returnType)){  
                                        cell.setCellValue(Integer.parseInt(data));  
                                    }else if("long".equals(returnType)){  
                                        cell.setCellValue(Long.parseLong(data));  
                                    }else if("float".equals(returnType)){  
                                        cell.setCellValue(floatDecimalFormat.format(Float.parseFloat(data)));  
                                    }else if("double".equals(returnType)){  
                                        cell.setCellValue(doubleDecimalFormat.format(Double.parseDouble(data)));  
                                    }else{  
                                        cell.setCellValue(data);  
                                    }  
                                }  
                            }else{   //字段为空 检查该列是否是公式  
                                if(colFormula!=null){  
                                    String sixBuf = colFormula[columnIndex].replace("@", (rowIndex+1)+"");  
                                    Cell cell = dataRow.createCell(columnIndex);  
                                    cell.setCellFormula(sixBuf.toString());  
                                }  
                            }  
                        }  
                    }  

                }  
            }  

            workbook.write(out);  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {    
            try {  
                out.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }    
    }  

    /** 
     * 将16进制的颜色代码写入样式中来设置颜色 
     * @param style  保证style统一 
     * @param color 颜色：66FFDD 
     * @param index 索引 8-64 使用时不可重复 
     * @return 
     */  
    public CellStyle setColor(CellStyle style,String color,short index){  
        if(color!=""&&color!=null){  
            //转为RGB码  
            int r = Integer.parseInt((color.substring(0,2)),16);   //转为16进制  
            int g = Integer.parseInt((color.substring(2,4)),16);  
            int b = Integer.parseInt((color.substring(4,6)),16);  
            //自定义cell颜色  
            HSSFPalette palette = workbook.getCustomPalette();   
            palette.setColorAtIndex((short)index, (byte) r, (byte) g, (byte) b);  

            style.setFillPattern(CellStyle.SOLID_FOREGROUND);   
            style.setFillForegroundColor(index);  
        }  
        return style;     
    }  

    /** 
     * 设置字体并加外边框 
     * @param style  样式 
     * @param style  字体名 
     * @param style  大小 
     * @return 
     */  
    public CellStyle setFontAndBorder(CellStyle style,String fontName,short size){  
        HSSFFont font = workbook.createFont();    
        font.setFontHeightInPoints(size);      
        font.setFontName(fontName);   
        font.setBold(true);  
        style.setFont(font);  
        style.setBorderBottom(CellStyle.BORDER_THIN); //下边框      
        style.setBorderLeft(CellStyle.BORDER_THIN);//左边框      
        style.setBorderTop(CellStyle.BORDER_THIN);//上边框      
        style.setBorderRight(CellStyle.BORDER_THIN);//右边框     
        return style;  
    }  
    /** 
     * 删除文件 
     * @param fileDir 
     * @return 
     */  
    public boolean deleteExcel(){  
        boolean flag = false;  
        File file = new File(this.fileDir);  
        // 判断目录或文件是否存在    
        if (!file.exists()) {  // 不存在返回 false    
            return flag;    
        } else {    
            // 判断是否为文件    
            if (file.isFile()) {  // 为文件时调用删除文件方法    
                file.delete();  
                flag = true;  
            }   
        }  
        return flag;  
    }  
    /** 
     * 删除文件 
     * @param fileDir 
     * @return 
     */  
    public boolean deleteExcel(String path){  
        boolean flag = false;  
        File file = new File(path);  
        // 判断目录或文件是否存在    
        if (!file.exists()) {  // 不存在返回 false    
            return flag;    
        } else {    
            // 判断是否为文件    
            if (file.isFile()) {  // 为文件时调用删除文件方法    
                file.delete();  
                flag = true;  
            }   
        }  
        return flag;  
    }  
}

三、调用工具类实现导出

@RequestMapping("/exportExcel")
    public  void  exportExcel(HttpServletRequest request,HttpServletResponse response){

    ModelAndView view=new ModelAndView("/search.jsp");
    AssetSearchCondition cond = new AssetSearchCondition(request, view);    
    cond.setPaging(new Paging(1, 1000));
    List<Asset> list = assetService.query(cond);
    PoiExcelExport pee = new PoiExcelExport(response, "report" ,"sheet1");

    String titleColumn[] = {"code","name","type","number","buy_price","manufacture_name","manufacture_date_str","org_name","manufacture_date_str","manufacturer"};

    String titleName[] = {"物料编码","物资名称","规格型号","数量","采购单价/万元","销售渠道","出厂年限","所属单位","存储地","生成厂商"};

    int titleSize[] = {15,20,13,13,13,13,13,13,20,20};
    pee.wirteExcel(titleColumn, titleName, titleSize, list);  

}

四、效果如下