java使用poi包将数据写入Excel表格

Posted 2020-08-24 钉子尹

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