导出Excel工具类—POI

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导出后的样式

这里写图片描述

使用方法（Strust2中的一个方法）

public String daoChu() throws Exception {        // 获取数据列表        List<CustCustomer> custCustomerList = getList();        ByteArrayOutputStream baos = new ByteArrayOutputStream();        // 表头行        List<String[]> headNames = new ArrayList<String[]>();        headNames.add(new String[] { "客户登录名", "客户名称", "联系人", "联系人电话", "授权码总数", "授权码余额", "购买时间", "是否有效" });        // 导出字段        List<String[]> fieldNames = new ArrayList<String[]>();        fieldNames.add(new String[] { "custNum", "custName", "custAttnName", "custAttnTel", "custAuthcodeNum",                "shengYuShouQuanShu", "custBuyTimeString", "isValid" });        ExportSetInfo setInfo = new ExportSetInfo();        // （有很多Sheet表）每个Sheet表的名称（key）和要导出的数据集合（value（对象的集合））        LinkedHashMap<String, List> userMap = new LinkedHashMap<String, List>();        userMap.put("客户信息", custCustomerList);        setInfo.setObjsMap(userMap);        setInfo.setFieldNames(fieldNames);        setInfo.setHeadNames(headNames);        setInfo.setTitles(new String[] { "客户信息" });        setInfo.setOut(baos);        // 将需要导出的数据输出到baos        ExcelUtil.export2Excel(setInfo);        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");        String dateStr = sdf.format(new Date());        fileName = new String(("客户信息" + dateStr + ".xls").getBytes("GBK"), "ISO-8859-1");        excelStream = new ByteArrayInputStream(baos.toByteArray());        return "EXP_EXCEL";    }

工具类

import java.io.OutputStream;import java.text.SimpleDateFormat;import java.util.Date;import java.util.LinkedHashMap;import java.util.List;import java.util.Map.Entry;import java.util.Set;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.hssf.util.CellRangeAddress;import org.apache.poi.ss.usermodel.CellStyle;import org.apache.poi.ss.usermodel.Font;import org.apache.poi.ss.usermodel.IndexedColors;@SuppressWarnings({"deprecation","rawtypes"})public class ExcelUtil {    private static HSSFWorkbook wb;    private static CellStyle titleStyle;        // 标题行样式    private static Font titleFont;              // 标题行字体            private static CellStyle dateStyle;         // 日期行样式    private static Font dateFont;               // 日期行字体    private static CellStyle headStyle;         // 表头行样式    private static Font headFont;               // 表头行字体    private static CellStyle contentStyle ;     // 内容行样式    private static Font contentFont;            // 内容行字体    /**     * @Description: 将Map里的集合对象数据输出Excel数据流     */    public static void export2Excel(ExportSetInfo setInfo) throws Exception{        init();        //每个Sheet表的名称和数据集合的集合        Set<Entry<String, List>> set = setInfo.getObjsMap().entrySet();        //处理Sheet表的名称（集合）        String[] sheetNames = new String[setInfo.getObjsMap().size()];        int sheetNameNum = 0;        for (Entry<String, List> entry : set){            sheetNames[sheetNameNum] = entry.getKey();            sheetNameNum++;        }        //使用处理好的Sheet表的名称创建出所有的Sheet表        HSSFSheet[] sheets = getSheets(setInfo.getObjsMap().size(), sheetNames);        int sheetNum = 0;        for (Entry<String, List> entry : set){            // Sheet（一张Sheet表的所有数据）            List objs = entry.getValue();            // 标题行            createTableTitleRow(setInfo, sheets, sheetNum);            // 日期行            createTableDateRow(setInfo, sheets, sheetNum);            // 表头            creatTableHeadRow(setInfo, sheets, sheetNum);            // 表体            String[] fieldNames = setInfo.getFieldNames().get(sheetNum);            int rowNum = 3;            for (Object obj : objs){                HSSFRow contentRow = sheets[sheetNum].createRow(rowNum);                contentRow.setHeight((short) 300);                HSSFCell[] cells = getCells(contentRow, setInfo.getFieldNames().get(sheetNum).length);                int cellNum = 1;                    // 去掉一列序号，因此从1开始                if(fieldNames != null){                    for (int num = 0; num < fieldNames.length; num++){                        Object value = ReflectionUtils.invokeGetterMethod(obj, fieldNames[num]);                        cells[cellNum].setCellValue(value == null ? "" : value.toString());                        cellNum++;                    }                }                rowNum++;            }            adjustColumnSize(sheets, sheetNum, fieldNames); // 自动调整列宽            sheetNum++;        }        wb.write(setInfo.getOut());    }    /**     * @Description: 初始化标题、列名称、表格内容等的字体、样式     */    private static void init(){        wb = new HSSFWorkbook();        titleFont = wb.createFont();        titleStyle = wb.createCellStyle();        dateFont = wb.createFont();        dateStyle = wb.createCellStyle();        headFont = wb.createFont();        headStyle = wb.createCellStyle();        contentFont = wb.createFont();        contentStyle = wb.createCellStyle();        initTitleCellStyle();        initTitleFont();        initDateCellStyle();        initDateFont();        initHeadCellStyle();        initHeadFont();        initContentCellStyle();        initContentFont();    }    /**     * @Description: 自动调整列宽     */    private static void adjustColumnSize(HSSFSheet[] sheets, int sheetNum, String[] fieldNames) {        for(int i = 0; i < fieldNames.length + 1; i++){            sheets[sheetNum].autoSizeColumn(i, true);        }    }    /**     * @Description: 创建标题行(需合并单元格)     */    private static void createTableTitleRow(ExportSetInfo setInfo, HSSFSheet[] sheets, int sheetNum){        CellRangeAddress titleRange = new CellRangeAddress(0, 0, 0, setInfo.getFieldNames().get(sheetNum).length);        sheets[sheetNum].addMergedRegion(titleRange);        HSSFRow titleRow = sheets[sheetNum].createRow(0);        titleRow.setHeight((short) 800);        HSSFCell titleCell = titleRow.createCell(0);        titleCell.setCellStyle(titleStyle);        titleCell.setCellValue(setInfo.getTitles()[sheetNum]);    }    /**     * @Description: 创建日期行(需合并单元格)     */    private static void createTableDateRow(ExportSetInfo setInfo, HSSFSheet[] sheets, int sheetNum){        CellRangeAddress dateRange = new CellRangeAddress(1, 1, 0, setInfo.getFieldNames().get(sheetNum).length);        sheets[sheetNum].addMergedRegion(dateRange);        HSSFRow dateRow = sheets[sheetNum].createRow(1);        dateRow.setHeight((short) 350);        HSSFCell dateCell = dateRow.createCell(0);        dateCell.setCellStyle(dateStyle);        dateCell.setCellValue(new SimpleDateFormat("yyyy-MM-dd").format(new Date()));    }    /**     * @Description: 创建表头行(需合并单元格)     */    private static void creatTableHeadRow(ExportSetInfo setInfo, HSSFSheet[] sheets, int sheetNum){        // 表头        HSSFRow headRow = sheets[sheetNum].createRow(2);        headRow.setHeight((short) 350);        // 序号列        HSSFCell snCell = headRow.createCell(0);        snCell.setCellStyle(headStyle);        snCell.setCellValue("序号");        // 列头名称        for(int num = 1, len = setInfo.getHeadNames().get(sheetNum).length; num <= len; num++){            HSSFCell headCell = headRow.createCell(num);            headCell.setCellStyle(headStyle);            headCell.setCellValue(setInfo.getHeadNames().get(sheetNum)[num - 1]);        }    }    /**     * @Description: 创建所有的Sheet     */    private static HSSFSheet[] getSheets(int num, String[] names){        HSSFSheet[] sheets = new HSSFSheet[num];        for (int i = 0; i < num; i++){            sheets[i] = wb.createSheet(names[i]);        }        return sheets;    }    /**     * @Description: 创建内容行的每一列(附加一列序号)     */    private static HSSFCell[] getCells(HSSFRow contentRow, int num){        HSSFCell[] cells = new HSSFCell[num + 1];        for (int i = 0,len = cells.length; i < len; i++){            cells[i] = contentRow.createCell(i);            cells[i].setCellStyle(contentStyle);        }        // 设置序号列值，因为出去标题行和日期行，所有-2        cells[0].setCellValue(contentRow.getRowNum() - 2);        return cells;    }    /**     * @Description: 初始化标题行样式     */    private static void initTitleCellStyle(){        titleStyle.setAlignment(CellStyle.ALIGN_CENTER);        titleStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);        titleStyle.setFont(titleFont);        titleStyle.setFillBackgroundColor(IndexedColors.SKY_BLUE.index);    }    /**     * @Description: 初始化日期行样式     */    private static void initDateCellStyle(){        dateStyle.setAlignment(CellStyle.ALIGN_CENTER_SELECTION);        dateStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);        dateStyle.setFont(dateFont);        dateStyle.setFillBackgroundColor(IndexedColors.SKY_BLUE.index);    }    /**     * @Description: 初始化表头行样式     */    private static void initHeadCellStyle(){        headStyle.setAlignment(CellStyle.ALIGN_CENTER);        headStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);        headStyle.setFont(headFont);        headStyle.setFillBackgroundColor(IndexedColors.YELLOW.index);        headStyle.setBorderTop(CellStyle.BORDER_MEDIUM);        headStyle.setBorderBottom(CellStyle.BORDER_THIN);        headStyle.setBorderLeft(CellStyle.BORDER_THIN);        headStyle.setBorderRight(CellStyle.BORDER_THIN);        headStyle.setTopBorderColor(IndexedColors.BLUE.index);        headStyle.setBottomBorderColor(IndexedColors.BLUE.index);        headStyle.setLeftBorderColor(IndexedColors.BLUE.index);        headStyle.setRightBorderColor(IndexedColors.BLUE.index);    }    /**     * @Description: 初始化内容行样式     */    private static void initContentCellStyle(){        contentStyle.setAlignment(CellStyle.ALIGN_CENTER);        contentStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);        contentStyle.setFont(contentFont);        contentStyle.setBorderTop(CellStyle.BORDER_THIN);        contentStyle.setBorderBottom(CellStyle.BORDER_THIN);        contentStyle.setBorderLeft(CellStyle.BORDER_THIN);        contentStyle.setBorderRight(CellStyle.BORDER_THIN);        contentStyle.setTopBorderColor(IndexedColors.BLUE.index);        contentStyle.setBottomBorderColor(IndexedColors.BLUE.index);        contentStyle.setLeftBorderColor(IndexedColors.BLUE.index);        contentStyle.setRightBorderColor(IndexedColors.BLUE.index);        contentStyle.setWrapText(true); // 字段换行    }    /**     * @Description: 初始化标题行字体     */    private static void initTitleFont(){        titleFont.setFontName("华文楷体");        titleFont.setFontHeightInPoints((short) 20);        titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD);        titleFont.setCharSet(Font.DEFAULT_CHARSET);        titleFont.setColor(IndexedColors.BLUE_GREY.index);    }    /**     * @Description: 初始化日期行字体     */    private static void initDateFont() {        dateFont.setFontName("隶书");        dateFont.setFontHeightInPoints((short) 10);        dateFont.setBoldweight(Font.BOLDWEIGHT_BOLD);        dateFont.setCharSet(Font.DEFAULT_CHARSET);        dateFont.setColor(IndexedColors.BLUE_GREY.index);    }    /**     * @Description: 初始化表头行字体     */    private static void initHeadFont() {        headFont.setFontName("宋体");        headFont.setFontHeightInPoints((short) 10);        headFont.setBoldweight(Font.BOLDWEIGHT_BOLD);        headFont.setCharSet(Font.DEFAULT_CHARSET);        headFont.setColor(IndexedColors.BLUE_GREY.index);    }    /**     * @Description: 初始化内容行字体     */    private static void initContentFont() {        contentFont.setFontName("宋体");        contentFont.setFontHeightInPoints((short) 10);        contentFont.setBoldweight(Font.BOLDWEIGHT_NORMAL);        contentFont.setCharSet(Font.DEFAULT_CHARSET);        contentFont.setColor(IndexedColors.BLUE_GREY.index);    }    /**     * @Description: 封装Excel导出的设置信息     */    public static class ExportSetInfo {        private LinkedHashMap<String, List> objsMap;        private String[] titles;        private List<String[]> headNames;        private List<String[]> fieldNames;        private OutputStream out;        public LinkedHashMap<String, List> getObjsMap(){            return objsMap;        }        /**         * @param objMap 导出数据         *          * 泛型         * String : 代表sheet名称         * List : 代表单个sheet里的所有行数据         */        public void setObjsMap(LinkedHashMap<String, List> objsMap) {            this.objsMap = objsMap;        }        public List<String[]> getFieldNames() {            return fieldNames;        }        /**         * @param clazz 对应每个sheet里的每行数据的对象的属性名称         */        public void setFieldNames(List<String[]> fieldNames) {            this.fieldNames = fieldNames;        }        public String[] getTitles() {            return titles;        }        /**         * @param titles 对应每个sheet里的标题，即顶部大字         */        public void setTitles(String[] titles) {            this.titles = titles;        }        public List<String[]> getHeadNames() {            return headNames;        }        /**         * @param headNames 对应每个页签的表头的每一列的名称         */        public void setHeadNames(List<String[]> headNames) {            this.headNames = headNames;        }        public OutputStream getOut() {            return out;        }        /**         * @param out Excel数据将输出到该输出流         */        public void setOut(OutputStream out) {            this.out = out;        }    }}

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