jxl导入导出实例

Posted 2020-08-21 皎陽

 1 package com.tgb.test;
  2 
  3 import java.io.File;
  4 import java.io.IOException;
  5 import java.util.ArrayList;
  6 import java.util.List;
  7 
  8 import jxl.Cell;
  9 import jxl.Sheet;
 10 import jxl.Workbook;
 11 import jxl.write.Label;
 12 import jxl.write.Number;
 13 import jxl.write.WritableImage;
 14 import jxl.write.WritableSheet;
 15 import jxl.write.WritableWorkbook;
 16 import jxl.write.WriteException;
 17 
 18 import org.apache.commons.lang3.math.NumberUtils;
 19 import org.junit.Test;
 20 //import org.junit.Test;
 21 public class JxlDemo {
 22      /**
 23      * 导入(导入到内存)
 24      */
 25     @Test
 26     public void importExcel() {
 27         Workbook book = null;
 28         try {
 29             book = Workbook.getWorkbook(new File("D:/test/test.xls"));
 30             // 获得第一个工作表对象
 31             Sheet sheet = book.getSheet(0);
 32             int rows=sheet.getRows();
 33             int columns=sheet.getColumns();
 34             // 遍历每行每列的单元格
 35             for(int i=0;i<rows;i++){
 36                 for(int j=0;j<columns;j++){
 37                     Cell cell = sheet.getCell(j, i);
 38                     String result = cell.getContents();
 39                     if(j==0){
 40                         System.out.print("姓名："+result+" ");
 41                     }
 42                     if(j==1){
 43                         System.out.print("年龄："+result+" ");
 44                     }
 45                     if((j+1)%2==0){ 
 46                         System.out.println();
 47                     }
 48                 }
 49             }
 50             System.out.println("========");
 51             // 得到第一列第一行的单元格
 52             Cell cell1 = sheet.getCell(0, 0);
 53             String result = cell1.getContents();
 54             System.out.println(result);
 55             System.out.println("========");
 56         } catch (Exception e) {
 57             System.out.println(e);
 58         }finally{
 59             if(book!=null){
 60                 book.close();
 61             }
 62         }
 63     }
 64 
 65     /**
 66      * 导出(导出到磁盘)
 67      */
 68     @Test
 69     public void exportExcel() {
 70         WritableWorkbook book = null;
 71         try {
 72             // 打开文件
 73             book = Workbook.createWorkbook(new File("D:/test/test.xls"));
 74             // 生成名为"学生"的工作表，参数0表示这是第一页
 75             WritableSheet sheet = book.createSheet("学生", 0);
 76             // 指定单元格位置是第一列第一行(0, 0)以及单元格内容为张三
 77             Label label = new Label(0, 0, "张三");
 78             // 将定义好的单元格添加到工作表中
 79             sheet.addCell(label);
 80             // 保存数字的单元格必须使用Number的完整包路径
 81             jxl.write.Number number = new jxl.write.Number(1, 0, 30);
 82             sheet.addCell(number);
 83             // 写入数据并关闭文件
 84             book.write();
 85         } catch (Exception e) {
 86             System.out.println(e);
 87         }finally{
 88             if(book!=null){
 89                 try {
 90                     book.close();
 91                 } catch (Exception e) {
 92                     e.printStackTrace();
 93                 } 
 94             }
 95         }
 96     }
 97     
 98     /**
 99      * 对象数据写入到Excel
100      */
101     @Test
102     public void writeExcel() {
103         WritableWorkbook book = null;
104         try {
105             // 打开文件
106             book = Workbook.createWorkbook(new File("D:/test/stu.xls"));
107             // 生成名为"学生"的工作表，参数0表示这是第一页
108             WritableSheet sheet = book.createSheet("学生", 0);
109             
110             List<Student> stuList=queryStudentList();
111             if(stuList!=null && !stuList.isEmpty()){
112                 for(int i=0; i<stuList.size(); i++){
113                     sheet.addCell(new Label(0, i, stuList.get(i).getName()));
114                     sheet.addCell(new Number(1, i, stuList.get(i).getAge()));
115                 }
116             }
117             
118             // 写入数据并关闭文件
119             book.write();
120         } catch (Exception e) {
121             System.out.println(e);
122         }finally{
123             if(book!=null){
124                 try {
125                     book.close();
126                 } catch (Exception e) {
127                     e.printStackTrace();
128                 } 
129             }
130         }
131     
132     }
133     
134     /**
135      * 读取Excel数据到内存
136      */
137     @Test
138     public void readExcel() {
139         Workbook book = null;
140         try {
141             // 打开文件
142             book = Workbook.getWorkbook(new File("D:/test/stu.xls"));
143             // 获得第一个工作表对象
144             Sheet sheet = book.getSheet(0);
145             int rows=sheet.getRows();
146             int columns=sheet.getColumns();
147             List<Student> stuList=new ArrayList<Student>();
148             // 遍历每行每列的单元格
149             for(int i=0;i<rows;i++){
150                 Student stu = new Student();
151                 for(int j=0;j<columns;j++){
152                     Cell cell = sheet.getCell(j, i);
153                     String result = cell.getContents();
154                     if(j==0){
155                         stu.setName(result);
156                     }
157                     if(j==1){
158                         stu.setAge(NumberUtils.toInt(result));
159                     }
160                     if((j+1)%2==0){
161                         stuList.add(stu);
162                         stu=null;
163                     }
164                 }
165             }
166             
167             //遍历数据
168             for(Student stu : stuList){
169                 System.out.println(String.format("姓名：%s, 年龄：%s", 
170                         stu.getName(), stu.getAge()));
171             }
172             
173         } catch (Exception e) {
174             System.out.println(e);
175         }finally{
176             if(book!=null){
177                 try {
178                     book.close();
179                 } catch (Exception e) {
180                     e.printStackTrace();
181                 } 
182             }
183         }
184     
185     }
186     
187     /**
188      * 图片写入Excel，只支持png图片
189      */
190     @Test
191     public void writeImg() {
192         WritableWorkbook wwb = null;
193         try {
194             wwb = Workbook.createWorkbook(new File("D:/test/image.xls"));
195             WritableSheet ws = wwb.createSheet("图片", 0);
196             File file = new File("D:\\test\\png.png");
197             //前两位是起始格，后两位是图片占多少个格，并非是位置
198             WritableImage image = new WritableImage(1, 4, 6, 18, file);
199             ws.addImage(image);
200             wwb.write();
201         } catch (Exception e) {
202             e.printStackTrace();
203         }finally{
204             if(wwb!=null){
205                 try {
206                     wwb.close();
207                 } catch (Exception e) {
208                     e.printStackTrace();
209                 }  
210             }
211         }
212     }
213     
214     private List<Student> queryStudentList(){
215         List<Student> stuList=new ArrayList<Student>();
216         stuList.add(new Student("zhangsan", 20));
217         stuList.add(new Student("lisi", 25));
218         stuList.add(new Student("wangwu", 30));
219         return stuList;
220     }
221     
222     public class Student {
223         private String name;
224         private int age;
225 
226         public Student() {
227         }
228 
229         public Student(String name, int age) {
230             super();
231             this.name = name;
232             this.age = age;
233         }
234 
235         public String getName() {
236             return name;
237         }
238 
239         public void setName(String name) {
240             this.name = name;
241         }
242 
243         public int getAge() {
244             return age;
245         }
246 
247         public void setAge(int age) {
248             this.age = age;
249         }
250     }
251 }

以上的代码简单明了的示范了JXL的导入导出功能，具体的导入导出工具类都是在此基础上建立起来的。在最近的项目中出现了一个小问题，就是导出Excel的文件名如果是中文就会出现乱码，所以需要做一些简单的处理，

response.setHeader("Content-disposition", "attachment; filename="+ new String( fileName.getBytes("gb2312"), "ISO8859-1" )+ ".xls");

 

　　更加详细健壮的设置如下：

 

fileName = new String(fileName.getBytes(),"iso-8859-1");
response.setCharacterEncoding("gb2312");
response.reset();
response.setContentType("application/OCTET-STREAM;charset=gb2312");
response.setHeader("pragma", "no-cache");
response.addHeader("Content-Disposition", "attachment;filename=\""
+ fileName + ".xls\"");// 点击导出excle按钮时候页面显示的默认名称
workbook = Workbook.createWorkbook(response.getOutputStream());