java poi 追加excel

由于工作需要本人写了个工具类来实现追加excel 的功能，用到了4个类文件 ，下面分别介绍有什么作用（poi 版本使用的3.9）

ChatExcel.java 实现追加功能的基础类，也是功能的父类。里面的功能有 获取路径文件 有则追加 没有创建等。

ChatMsgExcel.java 实现追加功能，具体的实现类。重写父类两个方法 append 与appendList 

ChatMsg.java  追加内容的实体类。

ChatField.java 实体中的属性 需要追加的 加上次注解

Reflections.java 反射的工具类，网上找的直接用。

为了方便 实体类中的 get set 方法没有贴出。项目地址：http://download.csdn.net/download/wd4871/9858879

ChatExcel.java 文件

package com.chat.serve.modules.chatserve.excel;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.client.utils.DateUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Comment;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import com.chat.serve.common.utils.Reflections;
import com.google.common.collect.Lists;

/**
 * 追加excel 父类
 * @author liyangyang
 *
 * @param 
 */
public abstract class ChatExcel {

	private Class clazz;
	
	public XSSFWorkbook wb;
	
	public Sheet sheet;
	
	private FileInputStream fileInput=null;
	
	private FileChannel fileChannel=null;
	private FileLock fileLock=null;
	
	/**
	 * 路径是否是文件
	 */
	public boolean isFile=false;
	
	/**
	 * 当前行号
	 */
	public int rownum;
	
	private List headerList=new ArrayList();
	
	private int headnum=0;
	
	/**
	 * 样式列表
	 */
	private Map styles;
	
	private String filePath;
	
	/**
	 * 注解列表（Object[]{ ExcelField, Field/Method }）
	 */
	List annotationList = Lists.newArrayList();
	
	public ChatExcel(String filePath) {
		this(filePath, "聊天记录",1);
	}
	
	//检测文件大小。
	private File checkFilePath(String filePath) {
		try {
			File file=new File(filePath);
			if(!file.exists()){
				return file;
			}else{
				long fileSize=file.length();
				if(fileSize > 1328427){//1.26MB左右，大概4-5万行左右
				   String fileName=DateUtils.formatDate(new Date(), "yyyyMMdd")+"-"+file.getName();
				   File path=new File(file.getParent());
				   FileUtils.copyFile(file, new File(path,fileName));
				   file.delete();
				}
				return file;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public ChatExcel(String filePath,String title,int headnum) {
		File file=checkFilePath(filePath);
		try {
			clazz=Reflections.getClassGenricType(getClass());
			if(file.exists() && file.isFile()){//文件存在//追加
				isFile=true;
				fileInput= new FileInputStream(file);
//				fileChannel=new RandomAccessFile(file, "rw").getChannel();
				wb=new XSSFWorkbook(fileInput);
				sheet=wb.getSheet("message");
//				fileLock=fileChannel.lock();
			}else{//文件不存在 // 新建
				isFile=false;
				wb=new XSSFWorkbook();
				sheet=wb.createSheet("message");
			}
			this.filePath=filePath;
			this.headnum=headnum;
			addHeader(title);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	/**
	 * 获取最后一个数据行号
	 * @return
	 */
	public int getLastDataRowNum(){
		return this.sheet.getLastRowNum()+headnum;
	}
	
	public void setData(Row row,T data){
		int colunm = 0;
		Object val = null;
		for (Object[] os : annotationList){
			if(os[1] instanceof Field){
				val = Reflections.invokeGetter(data, ((Field)os[1]).getName());
			}else if (os[1] instanceof Method){
				val = Reflections.invokeMethod(data, ((Method)os[1]).getName(), new Class[] {}, new Object[] {});
			}
			this.addCell(row, colunm++, val, 2, Class.class);
		}
	}
	
	public void setListData(int rownum,List data){
		for(T m:data){
		   Row row= sheet.createRow(rownum++);
		   setData(row, m);
		}
	}
	
	public abstract void appenList(List listdata);
	
	/**
	 * 添加一个单元格
	 * @param row 添加的行
	 * @param column 添加列号
	 * @param val 添加值
	 * @param align 对齐方式（1：靠左；2：居中；3：靠右）
	 * @return 单元格对象
	 */
	private Cell addCell(Row row, int column, Object val, int align, Class fieldType){
		Cell cell = row.createCell(column);
		String cellFormatString = "@";
		try {
			if(val == null){
				cell.setCellValue("");
			}else if(fieldType != Class.class){
				cell.setCellValue((String)fieldType.getMethod("setValue", Object.class).invoke(null, val));
			}else{
				if(val instanceof String) {
					cell.setCellValue((String) val);
				}else if(val instanceof Integer) {
					cell.setCellValue((Integer) val);
					cellFormatString = "0";
				}else if(val instanceof Long) {
					cell.setCellValue((Long) val);
					cellFormatString = "0";
				}else if(val instanceof Double) {
					cell.setCellValue((Double) val);
					cellFormatString = "0.00";
				}else if(val instanceof Float) {
					cell.setCellValue((Float) val);
					cellFormatString = "0.00";
				}else if(val instanceof Date) {
					cell.setCellValue((Date) val);
					cellFormatString = "yyyy-MM-dd HH:mm";
				}else {
					cell.setCellValue((String)Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(), 
						"fieldtype."+val.getClass().getSimpleName()+"Type")).getMethod("setValue", Object.class).invoke(null, val));
				}
			}
			if (val != null){
				CellStyle style = styles.get("data_column_"+column);
				if (style == null){
					style = wb.createCellStyle();
					style.cloneStyleFrom(styles.get("data"+(align>=1&&align<=3?align:"")));
			        style.setDataFormat(wb.createDataFormat().getFormat(cellFormatString));
					styles.put("data_column_" + column, style);
				}
				cell.setCellStyle(style);
			}
		} catch (Exception ex) {
			cell.setCellValue(val.toString());
		}
		return cell;
	}
	
	private void addHeader(String title){
		List listField= Arrays.asList(clazz.getDeclaredFields());
		for(Field field:listField){
			ChatField fieldClass=field.getAnnotation(ChatField.class);
			if(fieldClass!=null){
				annotationList.add(new Object[]{fieldClass,field});
//				headerList.add(f.getName());
			}
		}
		
		Collections.sort(annotationList,new Comparator() {
			@Override
			public int compare(Object[] o1, Object[] o2) {
				int o1int= ((ChatField)o1[0]).sort();
				int o2int= ((ChatField)o2[0]).sort();
				return o1int-o2int;
			}
			
		});
		for(Object[] ob:annotationList){
			String fiName=((Field)ob[1]).getName();
			headerList.add(fiName);
		}
		this.styles = createStyles(wb);
		if(!isFile){//新建 header
			Row titleRow = sheet.createRow(rownum++);
			titleRow.setHeightInPoints(30);
			Cell titleCell = titleRow.createCell(0);
			titleCell.setCellStyle(styles.get("title"));
			titleCell.setCellValue(title);
			sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(),
					titleRow.getRowNum(), titleRow.getRowNum(), headerList.size()-1));
			if (headerList == null){
				throw new RuntimeException("headerList not null!");
			}
			Row headerRow = sheet.createRow(rownum++);
			headerRow.setHeightInPoints(16);
			for (int i = 0; i < headerList.size(); i++) {
				Cell cell = headerRow.createCell(i);
				cell.setCellStyle(styles.get("header"));
				String[] ss = StringUtils.split(headerList.get(i), "**", 2);
				if (ss.length==2){
					cell.setCellValue(ss[0]);
					Comment comment = this.sheet.createDrawingPatriarch().createCellComment(
							new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
					comment.setString(new XSSFRichTextString(ss[1]));
					cell.setCellComment(comment);
				}else{
					cell.setCellValue(headerList.get(i));
				}
				sheet.autoSizeColumn(i);
			}
			for (int i = 0; i < headerList.size(); i++) {  
				int colWidth = sheet.getColumnWidth(i)*2;
		        sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);  
			}
		}
	}
	
	/**
	 * 创建表格样式
	 * @param wb 工作薄对象
	 * @return 样式列表
	 */
	private Map createStyles(Workbook wb) {
		Map styles = new HashMap();
		
		CellStyle style = wb.createCellStyle();
		style.setAlignment(CellStyle.ALIGN_CENTER);
		style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
		Font titleFont = wb.createFont();
		titleFont.setFontName("Arial");
		titleFont.setFontHeightInPoints((short) 16);
		titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
		style.setFont(titleFont);
		styles.put("title", style);

		style = wb.createCellStyle();
		style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
		style.setBorderRight(CellStyle.BORDER_THIN);
		style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderLeft(CellStyle.BORDER_THIN);
		style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderTop(CellStyle.BORDER_THIN);
		style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderBottom(CellStyle.BORDER_THIN);
		style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		Font dataFont = wb.createFont();
		dataFont.setFontName("Arial");
		dataFont.setFontHeightInPoints((short) 10);
		style.setFont(dataFont);
		styles.put("data", style);
		
		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(CellStyle.ALIGN_LEFT);
		styles.put("data1", style);

		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(CellStyle.ALIGN_CENTER);
		styles.put("data2", style);

		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(CellStyle.ALIGN_RIGHT);
		styles.put("data3", style);
		
		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
//		style.setWrapText(true);
		style.setAlignment(CellStyle.ALIGN_CENTER);
		style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setFillPattern(CellStyle.SOLID_FOREGROUND);
		Font headerFont = wb.createFont();
		headerFont.setFontName("Arial");
		headerFont.setFontHeightInPoints((short) 10);
		headerFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
		headerFont.setColor(IndexedColors.WHITE.getIndex());
		style.setFont(headerFont);
		styles.put("header", style);
		
		return styles;
	}
	
	
	public void export(){
		try {
			if(fileInput!=null){
				fileInput.close();
			}
			if(fileLock!=null){
				fileLock.release();
			}
			if(fileChannel!=null){
				fileChannel.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		write();
	}
	
	public void write(){
		try {
			FileOutputStream outputStream=new FileOutputStream(new File(filePath));
			wb.write(outputStream);
			outputStream.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	public abstract void append(T data);
	
}

ChatMsgExcel.java文件

package com.chat.serve.modules.chatserve.excel;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.poi.ss.usermodel.Row;
import com.chat.serve.modules.chatserve.entity.ChatMsg;
/**
 * 追加excel 实现类
 * @author 01054475
 *
 */
public class ChatMsgExcel extends ChatExcel{

	public ChatMsgExcel(String filePath) {
		super(filePath);
	}

	@Override
	public void append(ChatMsg data) {
		if(isFile){
		   int listData=getLastDataRowNum();
		   Row row= sheet.createRow(listData++);
		   setData(row, data);
		}else{
		   Row row=sheet.createRow(rownum++);
		   setData(row, data);
		}
		export();
	}
	
	@Override
	public void appenList(List listdata) {
		if(isFile){
		   int listData=getLastDataRowNum();
		   setListData(listData, listdata);
		}else{
		   setListData(rownum, listdata);
		}
		export();
	}

	
	public static void main(String[] args) {
		List list=new ArrayList();
		ChatMsg m=new ChatMsg();
		m.setFuid("fuid21");
		m.setTuid("tuid21");
		m.setAddTime(new Date());
		m.setContent("adsfadsfadsfasdfasdf");
		m.setIp("12.23.43.234");
		m.setUgroup("aaa");
		list.add(m);
		list.add(m);
		ChatMsgExcel e=new ChatMsgExcel("C:\\Users\\01054475\\Desktop\\chat\\msg1.xlsx");
		e.appenList(list);
		e.append(m);
		
	}
	
}

ChatMsg.java 文件

package com.chat.serve.modules.chatserve.entity;

import java.util.Date;

import com.chat.serve.common.persistence.BaseEntity;
import com.chat.serve.modules.chatserve.excel.ChatField;
import com.google.gson.annotations.Expose;

public class ChatMsg extends BaseEntity{
	
	private static final long serialVersionUID = 1L;
	
	@ChatField
    private String fuid;
	@ChatField
    private String tuid;
	@ChatField
    private String content;
	@ChatField
	private String ugroup;
	@ChatField
    private Date addTime;
    private Boolean msgType;
    private String isSend;
    @ChatField
    private String ip;
    

}

ChatField.java 文件

package com.chat.serve.modules.chatserve.excel;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 *   excel 注解。需要写入的属性 加上此注解。sort（） 排序
 **/
@Target({ElementType.FIELD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface ChatField {

	int sort() default 0;
}

Reflections.java 文件

/**
 * Copyright (c) 2005-2012 springside.org.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.wondersgroup.ningbo.common.utils;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;

/**
 * 反射工具类.
 * 提供调用getter/setter方法, 访问私有变量, 调用私有方法, 获取泛型类型Class, 被AOP过的真实类等工具函数.
 * @author calvin
 * @version 2013-01-15
 */
@SuppressWarnings("rawtypes")
public class Reflections {
	
	private static final String SETTER_PREFIX = "set";

	private static final String GETTER_PREFIX = "get";

	private static final String CGLIB_CLASS_SEPARATOR = "$$";
	
	private static Logger logger = LoggerFactory.getLogger(Reflections.class);

	/**
	 * 调用Getter方法.
	 * 支持多级，如：对象名.对象名.方法
	 */
	public static Object invokeGetter(Object obj, String propertyName) {
		Object object = obj;
		for (String name : StringUtils.split(propertyName, ".")){
			String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(name);
			object = invokeMethod(object, getterMethodName, new Class[] {}, new Object[] {});
		}
		return object;
	}

	/**
	 * 调用Setter方法, 仅匹配方法名。
	 * 支持多级，如：对象名.对象名.方法
	 */
	public static void invokeSetter(Object obj, String propertyName, Object value) {
		Object object = obj;
		String[] names = StringUtils.split(propertyName, ".");
		for (int i=0; i[] parameterTypes,
			final Object[] args) {
		Method method = getAccessibleMethod(obj, methodName, parameterTypes);
		if (method == null) {
			throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
		}

		try {
			return method.invoke(obj, args);
		} catch (Exception e) {
			throw convertReflectionExceptionToUnchecked(e);
		}
	}

	/**
	 * 直接调用对象方法, 无视private/protected修饰符，
	 * 用于一次性调用的情况，否则应使用getAccessibleMethodByName()函数获得Method后反复调用.
	 * 只匹配函数名，如果有多个同名函数调用第一个。
	 */
	public static Object invokeMethodByName(final Object obj, final String methodName, final Object[] args) {
		Method method = getAccessibleMethodByName(obj, methodName);
		if (method == null) {
			throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
		}

		try {
			return method.invoke(obj, args);
		} catch (Exception e) {
			throw convertReflectionExceptionToUnchecked(e);
		}
	}

	/**
	 * 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问.
	 * 
	 * 如向上转型到Object仍无法找到, 返回null.
	 */
	public static Field getAccessibleField(final Object obj, final String fieldName) {
		Validate.notNull(obj, "object can't be null");
		Validate.notBlank(fieldName, "fieldName can't be blank");
		for (Class superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) {
			try {
				Field field = superClass.getDeclaredField(fieldName);
				makeAccessible(field);
				return field;
			} catch (NoSuchFieldException e) {//NOSONAR
				// Field不在当前类定义,继续向上转型
				continue;// new add
			}
		}
		return null;
	}

	/**
	 * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
	 * 如向上转型到Object仍无法找到, 返回null.
	 * 匹配函数名+参数类型。
	 * 
	 * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
	 */
	public static Method getAccessibleMethod(final Object obj, final String methodName,
			final Class... parameterTypes) {
		Validate.notNull(obj, "object can't be null");
		Validate.notBlank(methodName, "methodName can't be blank");

		for (Class searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
			try {
				Method method = searchType.getDeclaredMethod(methodName, parameterTypes);
				makeAccessible(method);
				return method;
			} catch (NoSuchMethodException e) {
				// Method不在当前类定义,继续向上转型
				continue;// new add
			}
		}
		return null;
	}

	/**
	 * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
	 * 如向上转型到Object仍无法找到, 返回null.
	 * 只匹配函数名。
	 * 
	 * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
	 */
	public static Method getAccessibleMethodByName(final Object obj, final String methodName) {
		Validate.notNull(obj, "object can't be null");
		Validate.notBlank(methodName, "methodName can't be blank");

		for (Class searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
			Method[] methods = searchType.getDeclaredMethods();
			for (Method method : methods) {
				if (method.getName().equals(methodName)) {
					makeAccessible(method);
					return method;
				}
			}
		}
		return null;
	}

	/**
	 * 改变private/protected的方法为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
	 */
	public static void makeAccessible(Method method) {
		if ((!Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method.getDeclaringClass().getModifiers()))
				&& !method.isAccessible()) {
			method.setAccessible(true);
		}
	}

	/**
	 * 改变private/protected的成员变量为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
	 */
	public static void makeAccessible(Field field) {
		if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers()) || Modifier
				.isFinal(field.getModifiers())) && !field.isAccessible()) {
			field.setAccessible(true);
		}
	}

	/**
	 * 通过反射, 获得Class定义中声明的泛型参数的类型, 注意泛型必须定义在父类处
	 * 如无法找到, 返回Object.class.
	 * eg.
	 * public UserDao extends HibernateDao
	 *
	 * @param clazz The class to introspect
	 * @return the first generic declaration, or Object.class if cannot be determined
	 */
	@SuppressWarnings("unchecked")
	public static  Class getClassGenricType(final Class clazz) {
		return getClassGenricType(clazz, 0);
	}

	/**
	 * 通过反射, 获得Class定义中声明的父类的泛型参数的类型.
	 * 如无法找到, 返回Object.class.
	 * 
	 * 如public UserDao extends HibernateDao
	 *
	 * @param clazz clazz The class to introspect
	 * @param index the Index of the generic ddeclaration,start from 0.
	 * @return the index generic declaration, or Object.class if cannot be determined
	 */
	public static Class getClassGenricType(final Class clazz, final int index) {

		Type genType = clazz.getGenericSuperclass();

		if (!(genType instanceof ParameterizedType)) {
			logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
			return Object.class;
		}

		Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

		if (index >= params.length || index < 0) {
			logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: "
					+ params.length);
			return Object.class;
		}
		if (!(params[index] instanceof Class)) {
			logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
			return Object.class;
		}

		return (Class) params[index];
	}
	
	public static Class getUserClass(Object instance) {
		Assert.notNull(instance, "Instance must not be null");
		Class clazz = instance.getClass();
		if (clazz != null && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
			Class superClass = clazz.getSuperclass();
			if (superClass != null && !Object.class.equals(superClass)) {
				return superClass;
			}
		}
		return clazz;

	}
	
	/**
	 * 将反射时的checked exception转换为unchecked exception.
	 */
	public static RuntimeException convertReflectionExceptionToUnchecked(Exception e) {
		if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException
				|| e instanceof NoSuchMethodException) {
			return new IllegalArgumentException(e);
		} else if (e instanceof InvocationTargetException) {
			return new RuntimeException(((InvocationTargetException) e).getTargetException());
		} else if (e instanceof RuntimeException) {
			return (RuntimeException) e;
		}
		return new RuntimeException("Unexpected Checked Exception.", e);
	}
}