POI操作EXCEL--源自技术

POI简介

Apache POI是Apache软件基金会（http://baike.baidu.com/view/7044910.htm）的开放源码函式库，POI提供API给Java程序对Microsoft Office格式档案读和写的功能。

网址

Apache POI（http://poi.apache.org/）

简单实现

操作Excle

 public class ExcelUtil {

 public static XSSFWorkbook getWorkbook(String[] titles,String[] propertys,
         List<?> datas,TransformRule transformRule){
     ExcelUtil excelUtil = new ExcelUtil();
     XSSFWorkbook workbook = new XSSFWorkbook();
     XSSFSheet sheet = workbook.createSheet();
     excelUtil.setTitle(titles, sheet);
     if(null!=datas&&datas.size()>0){
         excelUtil.setBodyRow(propertys, datas, sheet,transformRule);
     }
     return workbook;
 }

 /*设置表头*/
 private void setTitle(String[] titles,XSSFSheet sheet) {
     XSSFRow row = sheet.createRow(0);
     int c = 0;
     for (String title :titles) {
         XSSFCell cell = row.createCell(c);
         cell.setCellValue(title);
         c++;
     }
 }

 /*填充表格*/
 private void setBodyRow(String[] propertys,
         List<?> datas, XSSFSheet sheet,TransformRule transformRule){
     XSSFRow row;
     int c;
     int r = 1;
     for (Object obj : datas) {
         c = 0;
         row = sheet.createRow(r);
         for (String key : propertys) {
             Object val = getAttributeValue(obj,key,transformRule,c);
             XSSFCell cell = row.createCell(c);
             if(null!=val)
                 cell.setCellValue(val.toString());
             else
                 cell.setCellValue("");
             c++;
         }
         r++;
     }
 }

 /*通过反射获取对象属性值*/
 private Object getAttributeValue(Object obj,String attrName,
         TransformRule transformRule,int index){
     Class<? extends Object> cl = obj.getClass();
     String attr = String.format("get%1$s%2$s",
                       attrName.substring(0, 1).toUpperCase(),
                       attrName.substring(1));
     try {
         Method method = cl.getDeclaredMethod(attr);
         Object val = method.invoke(obj);
         if(null==transformRule){
             return val;
         }else{
             return transformRule.form(obj,attrName, val,index);
         }
     } catch (NoSuchMethodException | SecurityException e) {
         e.printStackTrace();
     }catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
         e.printStackTrace();
     }
     return null;
 }
 }

属性值转义抽象接口：用来自定义值的转义规则

 public abstract class TransformRule {
     /**
      * 值转义接口
      * @param obj 数据对象
      * @param attribute 属性名称
      * @param val 值
      * @param indx 列下标
      * @return
      */
 public abstract String form(Object obj,String attribute,Object val,int indx);

 public Object getAttributeValue(Object obj,String attrName){
     Class<? extends Object> cl = obj.getClass();
     try {
         Method method = cl.getDeclaredMethod(attrName);
         Object val = method.invoke(obj);
         return val;
     } catch (NoSuchMethodException | SecurityException e) {
         e.printStackTrace();
     }catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
         e.printStackTrace();
     }
     return null;
 }

 public String objectToString(Object obj){
     if(null!=obj){
         return obj.toString();
     }else{
         return "";
     }
 }

 }

测试类

 public class User {
     private Integer id;
     private String name;
     private Integer sex;

     public User(Integer id,String name,Integer sex){
         setId(id);
         setName(name);
         setSex(sex);
     }

     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public Integer getSex() {
         return sex;
     }
     public void setSex(Integer sex) {
         this.sex = sex;
     }

     public static void main(String[] args) {

         List<User> datas = new ArrayList<User>();
         datas.add(new User(1, "李连杰",1));
         datas.add(new User(1, "成龙", 1));
         datas.add(new User(1, "舒淇", 0));

         /*转换规则*/
         TransformRule transformRule = new TransformRule() {
             @Override
             public String form(Object obj, String attribute, Object val,
                     int indx) {
                 if("sex".equals(attribute)){
                     if (val.equals(1)) {
                         return "男";
                     }else if (val.equals(0)) {
                         return "女";
                     }
                 }
                 return objectToString(val);
             }
         };

         String[] propertys = {"id","name","sex"};
         String[] titles = {"演员编号","名称","性别"};
         XSSFWorkbook bodyRow = getWorkbook(titles,propertys, datas,transformRule);
         FileOutputStream out;
         try {
             out = new FileOutputStream(new File("C:/Users/Administrator/Desktop/test.xlsx"));
             bodyRow.write(out);
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }