java Export Excel POI 转

最终选择用POI成功导出excel。总之很有用。

http://www.cnblogs.com/xwdreamer/archive/2011/07/20/2296975.html

http://poi.apache.org/download.html

Student.java

package org.leno.export.util;

import java.util.Date;

public class Student {
    private long id;
    private String name;
    private int age;
    private boolean sex;
    private Date birthday;

    public Student() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Student(long id, String name, int age, boolean sex, Date birthday) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
        this.sex = sex;
        this.birthday = birthday;
    }

    public long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public boolean getSex() {
        return sex;
    }

    public void setSex(boolean sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

}

ExportExcel.java

package myExcel;

import java.awt.List;
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.*;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.mail.Header;
import javax.swing.JOptionPane;
import javax.swing.plaf.synth.Region;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.formula.functions.T;

import classman.class_operation;
import util.stringUtil;

public class myExcelExcel<T> {
    public void exportExcel(Collection<T> dataset, OutputStream out) {
        exportExcel("testPOI", null, dataset, out, "yyyy-MM-dd");
    }

    public void exportExcel(String[] headers, Collection<T> dataset,
            OutputStream out) {
        exportExcel("testPOI", headers, dataset, out, "yyyy-MM-dd");
    }

    public void exportExcel(String[] headers, Collection<T> dataset,
            OutputStream out, String pattern) {
        exportExcel("testPOI", headers, dataset, out, pattern);

    }

    public void exportExcel(String title, String[] headers,
            Collection<T> dataset, OutputStream out, String pattern) {
        HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFSheet sheet = workbook.createSheet(title);
        sheet.setDefaultColumnWidth((short) 15);
        HSSFCellStyle style = workbook.createCellStyle();
        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);

        HSSFFont font = workbook.createFont();
        font.setColor(HSSFColor.VIOLET.index);
        font.setFontHeightInPoints((short) 12);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

        style.setFont(font);

        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);

        style2.setFont(font2);

        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();

        HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
                0, 0, 0, (short) 4, 2, (short) 6, 5));
        comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
        comment.setAuthor("leno");

        // 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 fileName = field.getName();
                String getMethodName = "get"
                        + fileName.substring(0, 1).toUpperCase()
                        + fileName.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[]) {

                    } else {
                        textValue=value.toString();

                    }
                    System.out.println(textValue);
                    if (textValue != null) {
                        Pattern p = Pattern.compile("^//d+(//.//d+)?$");
                        Matcher matcher = p.matcher(textValue);
                        if (matcher.matches()) {
                            cell.setCellValue(Double.parseDouble(textValue));
                        } else {
                            HSSFRichTextString richTextString = new HSSFRichTextString(
                                    textValue);
                            HSSFFont font3 = workbook.createFont();
                            font3.setColor(HSSFColor.BLUE.index);
                            richTextString.applyFont(font3);
                            cell.setCellValue(richTextString);
                        }
                    }

                } catch (SecurityException e) {
                    // TODO: handle exception
                    e.printStackTrace();
                } catch (NoSuchMethodException e) {
                    // TODO: handle exception
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    // TODO: handle exception
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    // TODO: handle exception
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    // TODO: handle exception
                    e.printStackTrace();
                } finally {
                    // 清理资源
                }
            }
        }

        try {
            workbook.write(out);

        } catch (IOException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }

    public void testMain() {

        String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" };
        myExcelExcel<Student> ex=new myExcelExcel<Student>();
        java.util.List<Student> dataset = new ArrayList<Student>();
        dataset.add(new Student(100001, "aa", 20, true, new java.util.Date()));
        dataset.add(new Student(2002, "bbb", 24, false, new java.util.Date()));
        dataset.add(new Student(3003, "ccc", 22, true, new java.util.Date()));
        try {

            OutputStream out = new FileOutputStream("c://a.xls");
            ex.exportExcel(headers, dataset,out);
            out.close();
            JOptionPane.showMessageDialog(null, "export OK!");
            System.out.println("export OK");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            // TODO: handle exception
        }
        catch (IOException e) {
            e.printStackTrace();
            // TODO: handle exception
        }

    }
}

这样写完已经可以导出了。

明天弄一个导出到浏览器客户端电脑上的功能。

写了个Servlet，果然在客户端用浏览器可以导出了。

Servlet

package brda;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ExportSvlt extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //File file = new File(getServletContext().getRealPath(""));
        response.setContentType("octets/stream");
        response.addHeader("Content-Disposition",
                "attachment;filename=test.xls");

        String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" };
        brdaExcel<Student> ex=new brdaExcel<Student>();
        java.util.List<Student> dataset = new ArrayList<Student>();
        dataset.add(new Student(100001, "aa", 20, true, new java.util.Date()));
        dataset.add(new Student(2002, "bbb", 24, false, new java.util.Date()));
        dataset.add(new Student(3003, "ccc", 22, true, new java.util.Date()));

        OutputStream out = response.getOutputStream();
        ex.exportExcel(headers, dataset, out);
        out.close();
        System.out.println("excel Export success!");
    }
    public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
        doGet(request, response);
    }

}

HTML

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form action="ExportSvlt" method="post">
        <input type="submit" value="ExportExcel">
    </form>
</body>
</html>