使用POI导出excel基础篇

最近搞了下POI导出Excel，听说很多次，却是第一次搞。

在pom.xml中引入依赖

 <dependency>
		　　<groupId>org.apache.poi</groupId>
		　　<artifactId>poi</artifactId>
		　　<version>3.10-FINAL</version>
	</dependency>
	<dependency>
		　　<groupId>org.apache.poi</groupId>
		　　<artifactId>poi-scratchpad</artifactId>
		　　<version>3.10-FINAL</version>
	</dependency>

效果如下：

1.

2.

废话不多说，直接附代码

Student.java

package com.jimmy.demo.poi;
public class Student {
   private long id;
   private Integer name;
   private int age;
   private String content;
   public String getContent() {
	return content;
}
public void setContent(String content) {
	this.content = content;
}
public Student() {
      super();
   }
   public Student(long id, Integer name, int age, String content) {
      super();
      this.id = id;
      this.name = name;
      this.age = age;
      this.content = content;
   }

   public long getId() {
      return id;
   }

   public void setId(long id) {
      this.id = id;
   }

   public Integer getName() {
      return name;
   }

   public void setName(Integer name) {
      this.name = name;
   }

   public int getAge() {
      return age;
   }

   public void setAge(int age) {
      this.age = age;
   }
}
 

Book.java

package com.jimmy.demo.poi;

public class Book {
   private int bookId;
   private String name;
   private String author;
   private float price;
   private String isbn;
   private String pubName;
   private byte[] preface;
   public Book() {
      super();
   }
   public Book(int bookId, String name, String author, float price,
         String isbn, String pubName, byte[] preface) {
      super();
      this.bookId = bookId;
      this.name = name;
      this.author = author;
      this.price = price;
      this.isbn = isbn;
      this.pubName = pubName;
      this.preface = preface;
   }

   public int getBookId() {
      return bookId;
   }

   public void setBookId(int bookId) {
      this.bookId = bookId;
   }

   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }

   public String getAuthor() {
      return author;
   }

   public void setAuthor(String author) {
      this.author = author;
   }

   public float getPrice() {
      return price;
   }

   public void setPrice(float price) {
      this.price = price;
   }

   public String getIsbn() {
      return isbn;
   }

   public void setIsbn(String isbn) {
      this.isbn = isbn;
   }

   public String getPubName() {
      return pubName;
   }

   public void setPubName(String pubName) {
      this.pubName = pubName;
   }

   public byte[] getPreface() {
      return preface;
   }

   public void setPreface(byte[] preface) {
      this.preface = preface;
   }
}

ExportExcel.java

package com.jimmy.demo.poi;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
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;

/**
 * @param <T> 应用泛型，代表任意一个符合javabean风格的类
 * 注意这里为了简单起见，boolean型的属性xxx的get器方式为getXxx(),而不是isXxx()
 * byte[]表jpg格式的图片数据
 */
public class ExportExcel<T> {
   public void exportExcel(String[] headers, Collection<T> dataset,
         OutputStream out) {
      exportExcel("测试POI导出EXCEL文档", headers, dataset, out, "yyyy-MM-dd");
   }
   /**
    * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
    *
    * @param title
    *            表格标题名
    * @param headers
    *            表格属性列名数组
    * @param dataset
    *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
    *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
    * @param out
    *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
    * @param pattern
    *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
    */
   @SuppressWarnings("unchecked")
   public void exportExcel(String title, String[] headers,
         Collection<T> dataset, OutputStream out, String pattern) {
      // 声明一个工作薄
      HSSFWorkbook workbook = new HSSFWorkbook();
      // 生成一个表格
      HSSFSheet sheet = workbook.createSheet(title);
      // 设置表格默认列宽度为15个字节
      sheet.setDefaultColumnWidth((short) 15);
      // 生成一个样式
      HSSFCellStyle style = workbook.createCellStyle();
      // 设置这些样式
      style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
      style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
      style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
      style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
      style.setBorderRight(HSSFCellStyle.BORDER_THIN);
      style.setBorderTop(HSSFCellStyle.BORDER_THIN);
      style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
      // 生成一个字体
      HSSFFont font = workbook.createFont();
      font.setColor(HSSFColor.VIOLET.index);
      font.setFontHeightInPoints((short) 12);
      font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
      // 把字体应用到当前的样式
      style.setFont(font);
      // 生成并设置另一个样式
      HSSFCellStyle style2 = workbook.createCellStyle();
      style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
      style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
      style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
      style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
      style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
      style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
      style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
      style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
      // 生成另一个字体
      HSSFFont font2 = workbook.createFont();
      font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
      // 把字体应用到当前的样式
      style2.setFont(font2);

      // 声明一个画图的顶级管理器
      HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
      // 定义注释的大小和位置,详见文档
      HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0, 0, 0, 0, (short) 4, 2, (short) 6, 5));
      // 设置注释内容
      comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
      // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
      comment.setAuthor("Jimmy");

      //产生表格标题行
      HSSFRow row = sheet.createRow(0);
      for (short i = 0; i < headers.length; i++) {
         HSSFCell cell = row.createCell(i);
         cell.setCellStyle(style);
         HSSFRichTextString text = new HSSFRichTextString(headers[i]);
         cell.setCellValue(text);
      }

      //遍历集合数据，产生数据行
      Iterator<T> it = dataset.iterator();
      int index = 0;
      while (it.hasNext()) {
         index++;
         row = sheet.createRow(index);
         T t = (T) it.next();
         //利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
         Field[] fields = t.getClass().getDeclaredFields();
         for (short i = 0; i < fields.length; i++) {
            HSSFCell cell = row.createCell(i);
            cell.setCellStyle(style2);
            Field field = fields[i];
            String fieldName = field.getName();
            String getMethodName = "get"
                   + fieldName.substring(0, 1).toUpperCase()
                   + fieldName.substring(1);
            try {
                Class tCls = t.getClass();
                Method getMethod = tCls.getMethod(getMethodName,
                      new Class[] {});
                Object value = getMethod.invoke(t, new Object[] {});
                //判断值的类型后进行强制类型转换
                String textValue = null;
                if (value instanceof Boolean) {
                   boolean bValue = (Boolean) value;
                   textValue = "男";
                   if (!bValue) {
                      textValue ="女";
                   }
                } else if (value instanceof Date) {
                   Date date = (Date) value;
                   SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                    textValue = sdf.format(date);
                }  else if (value instanceof byte[]) {
                   // 有图片时，设置行高为60px;
                   row.setHeightInPoints(60);
                   // 设置图片所在列宽度为80px,注意这里单位的一个换算
                   sheet.setColumnWidth(i, (short) (35.7 * 80));
                   // sheet.autoSizeColumn(i);
                   byte[] bsValue = (byte[]) value;
                   HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
                         1023, 255, (short) 6, index, (short) 6, index);
                   anchor.setAnchorType(2);
                   patriarch.createPicture(anchor, workbook.addPicture(
                         bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
                } else{
                   //其它数据类型都当作字符串简单处理
                   textValue = value.toString();
                }
                //如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
                if(textValue!=null){
                   Pattern p = Pattern.compile("^//d+(//.//d+)?$");
                   Matcher matcher = p.matcher(textValue);
                   if(matcher.matches()){
                      //是数字当作double处理
                      cell.setCellValue(Double.parseDouble(textValue));
                   }else{
                      HSSFRichTextString richString = new HSSFRichTextString(textValue);
                      HSSFFont font3 = workbook.createFont();
                      font3.setColor(HSSFColor.BLUE.index);
                      richString.applyFont(font3);
                      cell.setCellValue(richString);
                   }
                }
            } catch (SecurityException e) {
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            } finally {
                //清理资源
            }
         }

      }
      try {
         workbook.write(out);
      } catch (IOException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }

   }

   public static void main(String[] args) {
      // 测试学生
      ExportExcel<Student> ex = new ExportExcel<Student>();
      String[] headers = { "学期", "讲次数", "讲次名称", "知识点", };
      List<Student> dataset = new ArrayList<Student>();
      dataset.add(new Student(10000001, 1, 20,  "asdfasfd"));
      dataset.add(new Student(20000002, 2, 24,  "asdfasfd"));
      dataset.add(new Student(30000003, 3, 22,  "asdfasfd"));
      // 测试图书
      ExportExcel<Book> ex2 = new ExportExcel<Book>();
      String[] headers2 = { "图书编号", "图书名称", "图书作者", "图书价格", "图书ISBN",
            "图书出版社", "封面图片" };
      List<Book> dataset2 = new ArrayList<Book>();
      try {
         BufferedInputStream bis = new BufferedInputStream(
                new FileInputStream("E:\\book.jpg"));
         byte[] buf = new byte[bis.available()];
         while ((bis.read(buf)) != -1) {
            //
         }
         dataset2.add(new Book(1, "jsp", "leno", 300.33f, "1234567",
                "清华出版社", buf));
         dataset2.add(new Book(2, "java编程思想", "brucl", 300.33f, "1234567",
                "阳光出版社", buf));
         dataset2.add(new Book(3, "DOM艺术", "lenotang", 300.33f, "1234567",
                "清华出版社", buf));
         dataset2.add(new Book(4, "c++经典", "leno", 400.33f, "1234567",
                "清华出版社", buf));
         dataset2.add(new Book(5, "c#入门", "leno", 300.33f, "1234567",
                "汤春秀出版社", buf));

         OutputStream out = new FileOutputStream("C:\\Users\\Administrator\\Desktop\\a.xls");
         OutputStream out2 = new FileOutputStream("C:\\Users\\Administrator\\Desktop\\b.xls");
         ex.exportExcel(headers, dataset, out);
         ex2.exportExcel(headers2, dataset2, out2);
         out.close();
         System.out.println("excel导出成功！");
      } catch (FileNotFoundException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}