java生成Excel实例代码

工具类代码PoiExcelExport如下：

package com.myssm.util.poi;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:Mprivate 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;     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;    }}

测试如下：

实体bean:

package com.myssm.util.poi;public class Man {private String name;private int sex;private String idCard;private float salary;public Man(String name, int sex, String idCard, float salary) {super();this.name = name;this.sex = sex;this.idCard = idCard;this.salary = salary;}public Man() {super();}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getSex() {return sex;}public void setSex(int sex) {this.sex = sex;}public String getIdCard() {return idCard;}public void setIdCard(String idCard) {this.idCard = idCard;}public float getSalary() {return salary;}public void setSalary(float salary) {this.salary = salary;}}

测试类：

package com.myssm.util.poi;import java.util.ArrayList;import java.util.List;public class Test {public static void main(String[] args) {PoiExcelExport pee = new PoiExcelExport("E:/test.xls","sheet1");//数据        List<Man> dataList = new ArrayList();        Man man1 = new Man("张三",20,"男",(float)10000.8);        Man man2 = new Man("李四",21,"男",(float)11000.8);        Man man3 = new Man("王五",22,"女",(float)1200.8);        Man man4 = new Man("赵六",23,"男",(float)13000.8);        Man man5 = new Man("田七",24,"男",(float)14000.8);        Man man6 = new Man();        man6.setName("老八");        dataList.add(man1);dataList.add(man2);dataList.add(man3);dataList.add(man4);dataList.add(man5);        dataList.add(man6);        //调用        String titleColumn[] = {"name","sex","idCard","salary",""};        String titleName[] = {"姓名","性别","身份证号","月薪","年薪"};        int titleSize[] = {13,13,13,13,13};        //其他设置 set方法可全不调用        String colFormula[] = new String[5];        colFormula[4] = "D@*12";   //设置第5列的公式        pee.setColFormula(colFormula);        pee.setAddress("A:D");  //自动筛选                 pee.wirteExcel(titleColumn, titleName, titleSize, dataList);}}