Poi工具类快速生成Ecxel

先导入POI需要的依赖

    <dependencies>
        <dependency>
            <groupId>org.apache.poigroupId>
            <artifactId>poiartifactId>
            <version>4.1.2version>
        dependency>
        <dependency>
            <groupId>org.apache.poigroupId>
            <artifactId>poi-ooxmlartifactId>
            <version>4.1.2version>
        dependency>
        <dependency>
            <groupId>org.apache.poigroupId>
            <artifactId>poi-ooxml-schemasartifactId>
            <version>4.1.2version>
        dependency>
    dependencies>

上代码，后面再做解释

  1 package top.hjie;
  2 
  3 import java.io.FileOutputStream;
  4 import java.io.IOException;
  5 import java.io.OutputStream;
  6 import java.lang.reflect.Field;
  7 import java.math.BigDecimal;
  8 import java.util.ArrayList;
  9 import java.util.List;
 10 import java.util.Random;
 11 
 12 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 13 import org.apache.poi.ss.usermodel.Cell;
 14 import org.apache.poi.ss.usermodel.Row;
 15 import org.apache.poi.ss.usermodel.Sheet;
 16 import org.apache.poi.ss.usermodel.Workbook;
 17 import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 18 
 19 import com.alibaba.fastjson.JSON;
 20 import com.alibaba.fastjson.JSONArray;
 21 import com.alibaba.fastjson.JSONObject;
 22 
 23 /**
 24  * @ClassName: PoiUtils
 25  * @Description: TODO
 26  * @author 何杰
 27  * @date 2020年5月20日
 28  */
 29 public class PoiUtil {
 30 
 31     public static void main(String[] args) throws Exception {
 32         String a = "student.xx";
 33         System.out.println(a.substring(0, a.lastIndexOf(".")));
 34         String[] title = { "id", "标题", "名称", "重量" ,"学生"};
 35         String[] property = { "id", "title", "name", "weight" ,"student.xx"};
 36         List list = new ArrayList();
 37         for (int i = 0; i < 100; i++) {
 38             Person person = new Person();
 39             person.setId(i + 1);
 40             person.setName("名称" + (i + 1));
 41             person.setTitle("标题" + (i + 1));
 42             person.setWeight(new Random().nextInt(100000) + "g");
 43             Student s = new Student();
 44             s.setXx("222");
 45             person.setStudent(s);
 46             list.add(person);
 47         }
 48         Student student = new Student();
 49         student.setXx("6666");
 50         createEcxelByGroups(title, property, list, PoiType.XLSX);
 51         typeDict(a);
 52     }
 53 
 54     /**
 55      * @Title: createEcxel
 56      * @Description: 通过属性组创建Excel，序号自动生成
 57      * @param title
 58      *            标题
 59      * @param property
 60      *            对象的属性名
 61      * @param coll
 62      *            需要生成表格的对象
 63      * @param suffix
 64      *            后缀名 xls || xlsx
 65      * @throws SecurityException
 66      * @throws NoSuchFieldException
 67      * @throws IllegalAccessException
 68      * @throws IllegalArgumentException
 69      * @throws IOException
 70      */
 71     public static void createEcxelByGroups(String[] title, String[] property,
 72             List coll, PoiType suffix) throws NoSuchFieldException,
 73             SecurityException, IllegalArgumentException, IllegalAccessException {
 74         if (suffix == null) {
 75             throw new RuntimeException("请选择文件后缀名");
 76         }
 77         Workbook wb = null;
 78         if (suffix == PoiType.XLS) {
 79             wb = new HSSFWorkbook();
 80         } else {
 81             wb = new XSSFWorkbook();
 82         }
 83         Sheet st = wb.createSheet();
 84         // 创建第一行
 85         Row rowone = st.createRow(0);
 86         // 设置标题
 87         for (int i = 0; i <= title.length; i++) {
 88             Cell cell = rowone.createCell(i);
 89             if (i == 0) {
 90                 cell.setCellValue("序号");
 91                 continue;
 92             }
 93             cell.setCellValue(title[i - 1]);
 94         }
 95 
 96         // 填充值
 97         for (int i = 0; i < coll.size(); i++) {
 98             Class<? extends Object> clazz = coll.get(i).getClass();
 99 
100             Row row = st.createRow(i + 1);
101             for (int j = 0; j <= property.length; j++) {
102                 // 创建j++列
103                 Cell cell = row.createCell(j);
104                 if (j == 0) {
105                     cell.setCellValue(i + 1);
106                     continue;
107                 }
108                 // 判断要获取的属性名是否包含.
109                 if(property[j - 1].indexOf(".") == -1){
110                     // 不包含
111                     Field field = coll.get(i).getClass()
112                             .getDeclaredField(property[j - 1]);
113                     // 设置对象的访问权限，保证对private的属性的访问
114                     field.setAccessible(true);
115                     Object o = field.get(coll.get(i));
116                     cell.setCellValue(o + "");
117                 }else{
118                     // 包含
119                     Field field = coll.get(i).getClass()
120                             .getDeclaredField(property[j - 1].substring(0, property[j - 1].lastIndexOf(".")));
121                     // 设置对象的访问权限，保证对private的属性的访问
122                     field.setAccessible(true);
123                     Object o = field.get(coll.get(i));
124                     // 判断是否属于基本数据类型，或是否包含.
125                     if(!typeDict(o) && property[j - 1].indexOf(".") != -1){
126                         String value = getFieldValue(o, property[j - 1]);
127                         cell.setCellValue(value + "");
128                         continue;
129                     }
130                     cell.setCellValue(o + "");
131                 }
132             }
133         }
134         OutputStream fileOut = null;
135         try {
136             fileOut = new FileOutputStream("D:\\测试."
137                     + suffix.toString().toLowerCase());
138             wb.write(fileOut);
139         } catch (Exception e) {
140             e.printStackTrace();
141         } finally {
142             if (fileOut != null) {
143                 try {
144                     wb.close();
145                     fileOut.close();
146                 } catch (Exception e) {
147                     e.printStackTrace();
148                 }
149             }
150             if (wb != null) {
151                 try {
152                     wb.close();
153                 } catch (Exception e) {
154                     e.printStackTrace();
155                 }
156             }
157         }
158     }
159     
160     /**
161      * 
162      * @Description: 获取字段值
163      * @param @param obj 对象
164      * @param @param field 获取的字段名
165      * @param @return
166      * @return String
167      * @throws
168      */
169     public static String getFieldValue(Object obj, String field){
170         // 截取字段名，只支持一级，obj -> obj， 
171         try {
172             String fname = field.substring(field.lastIndexOf(".") + 1,field.length());
173             // 创建j++列
174             Field d = obj.getClass().getDeclaredField(fname);
175             // 设置对象的访问权限，保证对private的属性的访问
176             d.setAccessible(true);
177             Object o = d.get(obj);
178             return o + "";
179         } catch (Exception e) {
180             e.printStackTrace();
181         }
182         return null;
183     }
184 
185     public static boolean typeDict(Object obj){
186         Class<?>[] clazzs = {int.class,short.class,double.class,
187                 float.class,byte.class,long.class,char.class,boolean.class,
188                 String.class,Double.class,Float.class,Integer.class,Long.class,
189                 Short.class,Boolean.class,Character.class,Byte.class,BigDecimal.class};
190         
191         for (Class<?> c : clazzs) {
192             if(obj.getClass().isAssignableFrom(c)){
193                 return true;
194             }
195         }
196         return false;
197     }
198 
199 }
200 
201 enum PoiType {
202     XLS, XLSX;
203 }
204 
205 class Person {
206 
207     private int id;
208     private String title;
209     private String name;
210     private String weight;
211     private Student student;
212 
213     public int getId() {
214         return id;
215     }
216 
217     public void setId(int id) {
218         this.id = id;
219     }
220 
221     public String getTitle() {
222         return title;
223     }
224 
225     public void setTitle(String title) {
226         this.title = title;
227     }
228 
229     public String getName() {
230         return name;
231     }
232 
233     public void setName(String name) {
234         this.name = name;
235     }
236 
237     public String getWeight() {
238         return weight;
239     }
240 
241     public void setWeight(String weight) {
242         this.weight = weight;
243     }
244 
245     public Student getStudent() {
246         return student;
247     }
248 
249     public void setStudent(Student student) {
250         this.student = student;
251     }
252 
253 }
254 
255 class Student {
256     private String xx;
257 
258     public String getXx() {
259         return xx;
260     }
261 
262     public void setXx(String xx) {
263         this.xx = xx;
264     }
265 }



解释：


　　自动生成序号，title为标题，property为改标题下需要显示的对象属性名与对象属性名一一对应,只支持嵌套一级对象，对象->对象，由于是直接根据属性名获取值所以存在在get里写逻辑无效的问题，后期更改！

						  
					  
						
							


						

							
							
			Excelpoi							
						



						

						
						


						

						
					
					

					
					

						
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