导出数据到Excel表中--用Apache的POI实现简单封装

package nhu.drugstore.uitl;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class DataImportAndExportTool
{
private class Entiy
{
  String name;
  String text;
  String type;
}
private static DataImportAndExportTool tool=new DataImportAndExportTool();
/**
  * 空的构造方法
  */
private DataImportAndExportTool()
{
  //do nothing
}
/**
  * 
  * 以一个数组方式创建一个标题行　
  * @param row
  * @param title
  */
private void createTitleRow(HSSFWorkbook workbook,HSSFRow row,String[] title)
{
  int length=title.length;
  HSSFCellStyle style=workbook.createCellStyle();
  HSSFFont font=workbook.createFont();
  font.setColor(HSSFColor.BLUE.index);
  font.setFontHeightInPoints((short)14);
  font.setBoldweight((short)24);
  style.setFont(font);
  style.setFillBackgroundColor(HSSFColor.YELLOW.index);
  for(int i=0;i<length;i++)
  {
   HSSFCell cell=row.createCell(i);
   cell.setCellValue(title);
   cell.setCellStyle(style);
  }
}
/**
  * 解析XML文件
  * @param className
  * @return
  * @throws ParserConfigurationException 
  * @throws IOException 
  * @throws SAXException 
  */
private List<Entiy> parseXML(String className) throws Exception
{
  List<Entiy> list=new ArrayList<Entiy>();
  Document doc=DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(this.getClass().getClassLoader().getResourceAsStream("/"+className+".xml"));
  NodeList nodeList=doc.getElementsByTagName("property");
  Element element;
  for(int i=0;i<nodeList.getLength();i++)
  {
   element=(Element)nodeList.item(i);
   Entiy e=new Entiy();
   e.name=element.getAttribute("name");
   e.text=element.getAttribute("text");
   e.type=element.getAttribute("type");
   list.add(e);
  }
  return list;
}
/**
  * 创建工作表的标题行
  * @param workbook
  * @param row
  * @param list
  */
private  void createTitleRow(HSSFWorkbook workbook,HSSFRow row,List<Entiy> list)
{
  HSSFCellStyle style=workbook.createCellStyle();
  HSSFFont font=workbook.createFont();
  font.setColor(HSSFColor.BLUE.index);
  font.setFontHeightInPoints((short)14);
  font.setBoldweight((short)24);
  style.setFont(font);
  style.setFillBackgroundColor(HSSFColor.YELLOW.index);
  int i=0;
  for(Entiy e:list)
  {
   HSSFCell cell=row.createCell(i++);
   cell.setCellValue(e.text);
   cell.setCellStyle(style);
  }
}
/**
  * 从一个列表中创建出一个工作空间
  * @param list
  * @param sheetName
  * @return
  * @throws Exception
  */
public static HSSFWorkbook ExportToExcel(List list,String sheetName) throws Exception
{
  Class c=list.get(0).getClass();
  String className=c.getSimpleName();
  //解析XML文件中的信息到一个列表中
  List<Entiy> entiyList=tool.parseXML(className);
  //创建一个空工作空间
  HSSFWorkbook workbook=new HSSFWorkbook();
  //创建一个表
  HSSFSheet sheet=workbook.createSheet(sheetName);
  //创建标题行
  HSSFRow titleRow=sheet.createRow(0);
  tool.createTitleRow(workbook, titleRow,entiyList);
  /*
   * 创建表中的信息
   */
  int rowNum=1;
  for(int i=0;i<list.size();i++)
  {
   HSSFRow row=sheet.createRow(rowNum++);
   int colNum=0;
   for(Entiy e:entiyList)
   {
    if(e.type.endsWith("String"))
    {
     row.createCell(colNum++).setCellValue((String)MethodTool.excuteMethod(list.get(i),MethodTool.returnGetMethodName(e.name)));
    }
    else if("int".equals(e.type)||"java.lang.Integer".equals(e.type))
    {
     row.createCell(colNum++).setCellValue((Integer)MethodTool.excuteMethod(list.get(i),MethodTool.returnGetMethodName(e.name)));
    }
    else if("double".equals(e.type)||"java.lang.Double".equals(e.type))
    {
     row.createCell(colNum++).setCellValue((Double)MethodTool.excuteMethod(list.get(i),MethodTool.returnGetMethodName(e.name)));
    }
    else if(e.type.endsWith("Date"))
    {
     row.createCell(colNum++).setCellValue((Date)MethodTool.excuteMethod(list.get(i),MethodTool.returnGetMethodName(e.name)));
    }
    else if(e.type.endsWith("Calendar"))
    {
     row.createCell(colNum++).setCellValue((Calendar)MethodTool.excuteMethod(list.get(i),MethodTool.returnGetMethodName(e.name)));
    }
    else if("boolean".equals(e.type)||"java.lang.Boolean".equals(e.type))
    {
     row.createCell(colNum++).setCellValue((Double)MethodTool.excuteMethod(list.get(i),MethodTool.returnGetMethodName(e.name)));
    }
    else
    {
     throw new Exception("数据类型错误");
    }
   }
  }
  return workbook;
}

}

package nhu.drugstore.uitl;
import java.lang.reflect.Method;
/**
* 这是一个用于方法反射的工具类
* 这将运用JDK的反射机制
* @author strive
*
*/
public class MethodTool
{
/**
  * 反转一个有返回值的无参方法
  * @param object
  * @param methodName
  * @return
  * @throws Exception
  */
public static Object excuteMethod(Object object,String methodName) throws Exception
{
  Class c=object.getClass();
  Method m=c.getMethod(methodName);
  return m.invoke(object);
}
/**
  * 反转一个没有返回值的有一个参数的方法
  * @param object
  * @param methodName
  * @param parameter
  * @throws Exception
  */
public static void excuteMethod(Object object,String methodName,Object parameter) throws Exception
{
  Class c=object.getClass();
  Method m=c.getDeclaredMethod(methodName, parameter.getClass());
  m.invoke(object,parameter);
}
/**
  * 执行一个参数为boolean类型的方法
  * @param object
  * @param methodName
  * @param parameter
  * @throws Exception
  */
public static void excuteBoolMethod(Object object,String methodName,boolean parameter) throws Exception
{
  Class c=object.getClass();
  Method m=c.getDeclaredMethod(methodName,boolean.class);
  m.invoke(object,parameter);
}
/**
  * 获得一个属性的set方法名
  * @param property
  * @return
  */
public static String returnSetMethodName(String property)
{
  return "set"+Character.toUpperCase(property.charAt(0))+property.substring(1);
}
/**
  * 获得一个属性的get方法名
  * @param property
  * @return
  */
public static String returnGetMethodName(String property)
{
  return "get"+Character.toUpperCase(property.charAt(0))+property.substring(1);
}
}

/

package nhu.drugstore.bean;

/**
*  this is a class description a  model of Medicine
*  only some geter and seter method
* @author strive
* @hibernate.class
*/
public class Medicine
{
/**
  * 主键
  * @hibernate.id generator-class="native"
  */
private int id;
/**
  * 药品名称
  * @hibernate.property
  * unique="true"
  */
private String name;
/**
  * 放药药框
  * @hibernate.property
  */
private String ark;
/**
  * 条形码
  * @hibernate.property
  * 
  */
private String barCode;
/**
  * 功效描述
  * @hibernate.property
  */
private String efficacy;
/**
  * 进货价格
  * @hibernate.property
  */
private double buyPrice;
/**
  * 出售价格
  * @hibernate.property
  */
private double sellPrice;
/**
  * 库存量
  * @hibernate.property
  */
private double stockpile;
/**
  * 库存不足提示数量
  * @hibernate.property
  */
private double cueNumber;
/**
  * 打折百分比
  * @hibernate.property
  */
private double rebate;
/**
  * 提成百分比
  * @hibernate.property
  */
private double rakeOff;
/**
  * 拼音简查码
  * @hibernate.property
  */
private String spellShort;
/**
  * 数字简查码
  * @hibernate.property
  */
private String numberShort;
public int getId()
{
  return id;
}
public void setId(int id)
{
  this.id = id;
}
public String getName()
{
  return name;
}
public void setName(String name)
{
  this.name = name;
}
public String getArk()
{
  return ark;
}
public void setArk(String ark)
{
  this.ark = ark;
}
public String getBarCode()
{
  return barCode;
}
public void setBarCode(String barCode)
{
  this.barCode = barCode;
}
public String getEfficacy()
{
  return efficacy;
}
public void setEfficacy(String efficacy)
{
  this.efficacy = efficacy;
}
public double getBuyPrice()
{
  return buyPrice;
}
public void setBuyPrice(double buyPrice)
{
  this.buyPrice = buyPrice;
}
public double getSellPrice()
{
  return sellPrice;
}
public void setSellPrice(double sellPrice)
{
  this.sellPrice = sellPrice;
}
public double getStockpile()
{
  return stockpile;
}
public void setStockpile(double stockpile)
{
  this.stockpile = stockpile;
}
public double getCueNumber()
{
  return cueNumber;
}
public void setCueNumber(double cueNumber)
{
  this.cueNumber = cueNumber;
}
public double getRebate()
{
  return rebate;
}
public void setRebate(double rebate)
{
  this.rebate = rebate;
}
public double getRakeOff()
{
  return rakeOff;
}
public void setRakeOff(double rakeOff)
{
  this.rakeOff = rakeOff;
}
public String getSpellShort()
{
  return spellShort;
}
public void setSpellShort(String spellShort)
{
  this.spellShort = spellShort;
}
public String getNumberShort()
{
  return numberShort;
}
public void setNumberShort(String numberShort)
{
  this.numberShort = numberShort;
}
}

<?xml version="1.0" encoding="UTF-8"?>
<bean class="nhu.drugstore.bean.Medicine">
<property name="name" text="药品名称" type="String"/>
<property name="ark" text="放药药框" type="String"/>
<property name="barCode" text="条形码" type="String"/>
<property name="buyPrice" text="进货价格" type="double"/>
<property name="stockpile" text="库存量" type="double"/>
<property name="sellPrice" text="出售价格" type="double"/>
<property name="rebate" text="打折百分比" type="double"/>
<property name="efficacy" text="功效描述" type="String"/>
</bean>

File outputFile=new File("C:/");
OutputStream fOut = new PrintStream(outputFile);
   // 把相应的Excel 工作簿存盘
DataImportAndExportTool.ExportToExcel(medicineDao.getAllMedicine(),"药材信息表").write(fOut);
   fOut.flush();
   // 操作结束，关闭文件
   fOut.close();

LZ好，你这个挺好用的，不过我在项目搞了一些改造：

首先加了一个annotation:

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface Cell {
	/**
	 * 该字段对应的表格头
	 */
	public String title();
}

 接着在ExportTool里增加一个方法来解析annotation:

/**
	 * 解析出元数据信息，初始化excel导出
	 * 
	 * @param className
	 * @return
	 * @throws ClassNotFoundException
	 */
	private List<Entity> parseAnnotation(Class clazz)
			throws ClassNotFoundException {
		List<Entity> entities = new ArrayList<Entity>();
		Field[] fields = clazz.getDeclaredFields();

		for (Field field : fields) {
			Entity e = new Entity();
			boolean hasAnnotation = field.isAnnotationPresent(Cell.class);

			if (hasAnnotation) {
				Cell annotation = field.getAnnotation(Cell.class);
				e.title = annotation.title();
				e.type = field.getType().getName();
				e.name = field.getName();

				entities.add(e);
			}
		}

		return entities;
	}

 其他的变动不大，对于需要导出的值对象，用annotation标注一下就可以了：

public class Student {
    @Cell(title = "学号")
    private long serialNumber;
    
    @Cell(title = "姓名")
    private String name;
    
    @Cell(title = "性别")
    private String sexual;
    
    @Cell(title = "分数")
    private Long score;
…
}

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface Cell {
	/**
	 * 该字段对应的表格头
	 */
	public String title();
}

/**
	 * 解析出元数据信息，初始化excel导出
	 * 
	 * @param className
	 * @return
	 * @throws ClassNotFoundException
	 */
	private List<Entity> parseAnnotation(Class clazz)
			throws ClassNotFoundException {
		List<Entity> entities = new ArrayList<Entity>();
		Field[] fields = clazz.getDeclaredFields();

		for (Field field : fields) {
			Entity e = new Entity();
			boolean hasAnnotation = field.isAnnotationPresent(Cell.class);

			if (hasAnnotation) {
				Cell annotation = field.getAnnotation(Cell.class);
				e.title = annotation.title();
				e.type = field.getType().getName();
				e.name = field.getName();

				entities.add(e);
			}
		}

		return entities;
	}

public class Student {
    @Cell(title = "学号")
    private long serialNumber;
    
    @Cell(title = "姓名")
    private String name;
    
    @Cell(title = "性别")
    private String sexual;
    
    @Cell(title = "分数")
    private Long score;
…
}

1、把配置写到java里，要是需求改变，是不是重新编译代码

2、to LZ：如果用户对数据格式有要求，不如日期有yyyyMMdd或者yyyy-MM-dd不同需要，好像不能满足。

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface Cell {
	/**
	 * 该字段对应的表格头
	 */
	public String title();
}

/**
	 * 解析出元数据信息，初始化excel导出
	 * 
	 * @param className
	 * @return
	 * @throws ClassNotFoundException
	 */
	private List<Entity> parseAnnotation(Class clazz)
			throws ClassNotFoundException {
		List<Entity> entities = new ArrayList<Entity>();
		Field[] fields = clazz.getDeclaredFields();

		for (Field field : fields) {
			Entity e = new Entity();
			boolean hasAnnotation = field.isAnnotationPresent(Cell.class);

			if (hasAnnotation) {
				Cell annotation = field.getAnnotation(Cell.class);
				e.title = annotation.title();
				e.type = field.getType().getName();
				e.name = field.getName();

				entities.add(e);
			}
		}

		return entities;
	}

public class Student {
    @Cell(title = "学号")
    private long serialNumber;
    
    @Cell(title = "姓名")
    private String name;
    
    @Cell(title = "性别")
    private String sexual;
    
    @Cell(title = "分数")
    private Long score;
…
}

使用注解的方式确实得重新编译，这点比不上使用xml的方式啊；

日期的格式，为方法多加个日期格式的参数，呵呵。