POI操作EXCEL

POI简介

Apache POI是Apache软件基金会的开放源码函式库，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

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();
		}
	}
}