java使用poi包将数据写入Excel表格
1、Excel相关操作代码
1 import java.io.File; 2 import java.io.FileInputStream; 3 import java.io.FileNotFoundException; 4 import java.io.FileOutputStream; 5 import java.io.IOException; 6 import java.lang.reflect.Field; 7 import java.lang.reflect.Method; 8 import java.util.ArrayList; 9 import java.util.List; 10 11 import org.apache.poi.hssf.usermodel.HSSFRow; 12 import org.apache.poi.hssf.usermodel.HSSFSheet; 13 import org.apache.poi.hssf.usermodel.HSSFWorkbook; 14 import org.apache.poi.ss.usermodel.Cell; 15 import org.apache.poi.ss.usermodel.Row; 16 import org.springframework.stereotype.Component; 17 18 /** 19 * @Description: 20 * @author 21 * @date 创建时间:2016年12月8日下午2:38:47 22 * @version 1.0 23 */ 24 @Component 25 public class ExcelManage { 26 private HSSFWorkbook workbook = null; 27 28 /** 29 * 判断文件是否存在 30 * @param filePath 文件路径 31 * @return 32 */ 33 public boolean fileExist(String filePath){ 34 boolean flag = false; 35 File file = new File(filePath); 36 flag = file.exists(); 37 return flag; 38 } 39 40 /** 41 * 判断文件的sheet是否存在 42 * @param filePath 文件路径 43 * @param sheetName 表格索引名 44 * @return 45 */ 46 public boolean sheetExist(String filePath,String sheetName){ 47 boolean flag = false; 48 File file = new File(filePath); 49 if(file.exists()){ //文件存在 50 //创建workbook 51 try { 52 workbook = new HSSFWorkbook(new FileInputStream(file)); 53 //添加Worksheet(不添加sheet时生成的xls文件打开时会报错) 54 HSSFSheet sheet = workbook.getSheet(sheetName); 55 if(sheet!=null) 56 flag = true; 57 } catch (Exception e) { 58 e.printStackTrace(); 59 } 60 }else{ //文件不存在 61 flag = false; 62 } 63 return flag; 64 } 65 /** 66 * 创建新Sheet并写入第一行数据 67 * @param filePath excel的路径 68 * @param sheetName 要创建的表格索引 69 * @param titleRow excel的第一行即表格头 70 * @throws IOException 71 * @throws FileNotFoundException 72 */ 73 public void createSheet(String filePath,String sheetName,String titleRow[]) throws FileNotFoundException, IOException{ 74 FileOutputStream out = null; 75 File excel = new File(filePath); // 读取文件 76 FileInputStream in = new FileInputStream(excel); // 转换为流 77 workbook = new HSSFWorkbook(in); // 加载excel的 工作目录 78 79 workbook.createSheet(sheetName); // 添加一个新的sheet 80 //添加表头 81 Row row = workbook.getSheet(sheetName).createRow(0); //创建第一行 82 try { 83 for(int i = 0;i < titleRow.length;i++){ 84 Cell cell = row.createCell(i); 85 cell.setCellValue(titleRow[i]); 86 } 87 out = new FileOutputStream(filePath); 88 workbook.write(out); 89 }catch (Exception e) { 90 e.printStackTrace(); 91 }finally { 92 try { 93 out.close(); 94 } catch (IOException e) { 95 e.printStackTrace(); 96 } 97 } 98 } 99 /** 100 * 创建新excel. 101 * @param filePath excel的路径 102 * @param sheetName 要创建的表格索引 103 * @param titleRow excel的第一行即表格头 104 */ 105 public void createExcel(String filePath,String sheetName,String titleRow[]){ 106 //创建workbook 107 workbook = new HSSFWorkbook(); 108 //添加Worksheet(不添加sheet时生成的xls文件打开时会报错) 109 workbook.createSheet(sheetName); 110 //新建文件 111 FileOutputStream out = null; 112 try { 113 //添加表头 114 Row row = workbook.getSheet(sheetName).createRow(0); //创建第一行 115 for(int i = 0;i < titleRow.length;i++){ 116 Cell cell = row.createCell(i); 117 cell.setCellValue(titleRow[i]); 118 } 119 out = new FileOutputStream(filePath); 120 workbook.write(out); 121 } catch (Exception e) { 122 e.printStackTrace(); 123 } finally { 124 try { 125 out.close(); 126 } catch (IOException e) { 127 e.printStackTrace(); 128 } 129 } 130 } 131 /** 132 * 删除文件. 133 * @param filePath 文件路径 134 */ 135 public boolean deleteExcel(String filePath){ 136 boolean flag = false; 137 File file = new File(filePath); 138 // 判断目录或文件是否存在 139 if (!file.exists()) { 140 return flag; 141 } else { 142 // 判断是否为文件 143 if (file.isFile()) { // 为文件时调用删除文件方法 144 file.delete(); 145 flag = true; 146 } 147 } 148 return flag; 149 } 150 /** 151 * 往excel中写入. 152 * @param filePath 文件路径 153 * @param sheetName 表格索引 154 * @param object 155 */ 156 public void writeToExcel(String filePath,String sheetName, Object object,String titleRow[]){ 157 //创建workbook 158 File file = new File(filePath); 159 try { 160 workbook = new HSSFWorkbook(new FileInputStream(file)); 161 } catch (FileNotFoundException e) { 162 e.printStackTrace(); 163 } catch (IOException e) { 164 e.printStackTrace(); 165 } 166 FileOutputStream out = null; 167 HSSFSheet sheet = workbook.getSheet(sheetName); 168 // 获取表格的总行数 169 int rowCount = sheet.getLastRowNum() + 1; // 需要加一 170 try { 171 Row row = sheet.createRow(rowCount); //最新要添加的一行 172 //通过反射获得object的字段,对应表头插入 173 // 获取该对象的class对象 174 Class<? extends Object> class_ = object.getClass(); 175 176 for(int i = 0;i < titleRow.length;i++){ 177 String title = titleRow[i]; 178 String UTitle = Character.toUpperCase(title.charAt(0))+ title.substring(1, title.length()); // 使其首字母大写; 179 String methodName = "get"+UTitle; 180 Method method = class_.getDeclaredMethod(methodName); // 设置要执行的方法 181 String data = method.invoke(object).toString(); // 执行该get方法,即要插入的数据 182 Cell cell = row.createCell(i); 183 cell.setCellValue(data); 184 } 185 out = new FileOutputStream(filePath); 186 workbook.write(out); 187 } catch (Exception e) { 188 e.printStackTrace(); 189 } finally { 190 try { 191 out.close(); 192 } catch (IOException e) { 193 e.printStackTrace(); 194 } 195 } 196 } 197 }
2、main方法调用方式
1 public static void main(String[] args) { 2 String filePath = "result/数据汇总.xls"; 3 String sheetName = "测试"; 4 //Excel文件易车sheet页的第一行 5 String title[] = {"日期", "城市","新发布车源数"}; 6 //Excel文件易车每一列对应的数据 7 String titleDate[] = {"date", "city","newPublish"}; 8 9 ExcelManage em = new ExcelManage(); 10 //判断该名称的文件是否存在 11 boolean fileFlag = em.fileExist(filePath); 12 if(!fileFlag){ 13 em.createExcel(filePath,sheetName,title); 14 } 15 //判断该名称的Sheet是否存在 16 boolean sheetFlag = em.sheetExist(filePath,sheetName); 17 //如果该名称的Sheet不存在,则新建一个新的Sheet 18 if(!sheetFlag){ 19 try { 20 em.createSheet(filePath,sheetName,title); 21 } catch (FileNotFoundException e) { 22 e.printStackTrace(); 23 } catch (IOException e) { 24 e.printStackTrace(); 25 } 26 } 28 YiCheData user = new YiCheData(); 29 user.setDate("206-12-21"); 30 user.setCity("北京"); 31 user.setNewPublish("5"); 32 //写入到excel 33 em.writeToExcel(filePath,sheetName,user,titleDate); 34 }
3、用于测试的bean类
1 public class YiCheData { 2 private String date; 3 private String city; 4 private String newPublish; 5 6 public String getDate() { 7 return date; 8 } 9 public void setDate(String date) { 10 this.date = date; 11 } 12 public String getCity() { 13 return city; 14 } 15 public void setCity(String city) { 16 this.city = city; 17 } 18 public String getNewPublish() { 19 eturn newPublish; 20 } 21 public void setNewPublish(String newPublish) { 22 this.newPublish = newPublish; 23 } 24 }
以上代码请参考:http://www.open-open.com/lib/view/open1433238476150.html