jsp页面里的分页表格导出Excel

两次方法的转换,加上一次逻辑思路的修正终于成功了!

第一个方法想到的是JS导出Excel。网上搜了很多代码。

 
 
 
 
     
    WEB页面导出为EXCEL文档的方法 
 
 
    
WEB页面导出为EXCEL文档的方法
列标题1 列标题2 列标题3 列标题4 列标题5
aaa ccc ddd eee
AAA CCC DDD EEE
FFF GGG HHH III JJJ

这三种试了都不行。后来才发现问题所在。

jsp页面里的分页表格导出Excel_第1张图片

js导出Excel不适合分页的表格。

第二个方法,按照这个大牛提到的POI的方法,在网上找了POI导出Excel的代码,看了很多。用了下面这个比较通用的方法。

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;
    }

}

Book.java

package org.leno.export.util;

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

复制代码
package org.leno.export.util;

import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.text.SimpleDateFormat;
import javax.swing.JOptionPane;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;

/**
 * 利用开源组件POI3.0.2动态导出EXCEL文档 转载时请保留以下信息,注明出处!
 *
 * @author leno
 * @version v1.0
 * @param
 *            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 {

    public void exportExcel(Collection dataset, OutputStream out) {
        exportExcel("测试POI导出EXCEL文档", null, dataset, out, "yyyy-MM-dd");
    }

    public void exportExcel(String[] headers, Collection dataset,
            OutputStream out) {
        exportExcel("测试POI导出EXCEL文档", headers, dataset, out, "yyyy-MM-dd");
    }

    public void exportExcel(String[] headers, Collection dataset,
            OutputStream out, String pattern) {
        exportExcel("测试POI导出EXCEL文档", headers, dataset, out, pattern);
    }

    /**
    * 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 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("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 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 Integer) {
                    // int intValue = (Integer) value;
                    // cell.setCellValue(intValue);
                    // } else if (value instanceof Float) {
                    // float fValue = (Float) value;
                    // textValue = new HSSFRichTextString(
                    // String.valueOf(fValue));
                    // cell.setCellValue(textValue);
                    // } else if (value instanceof Double) {
                    // double dValue = (Double) value;
                    // textValue = new HSSFRichTextString(
                    // String.valueOf(dValue));
                    // cell.setCellValue(textValue);
                    // } else if (value instanceof Long) {
                    // long longValue = (Long) value;
                    // cell.setCellValue(longValue);
                    // }
                    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) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (NoSuchMethodException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    // TODO Auto-generated catch block
                    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 ex = new ExportExcel();
        String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" };
        List dataset = new ArrayList();
        dataset.add(new Student(10000001, "张三", 20, true, new Date()));
        dataset.add(new Student(20000002, "李四", 24, false, new Date()));
        dataset.add(new Student(30000003, "王五", 22, true, new Date()));
        // 测试图书
        ExportExcel ex2 = new ExportExcel();
        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 dataset2 = new ArrayList();
        try {
            BufferedInputStream bis = new BufferedInputStream(
                    new FileInputStream("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("E://a.xls");
            OutputStream out2 = new FileOutputStream("E://b.xls");
            ex.exportExcel(headers, dataset, out);
            ex2.exportExcel(headers2, dataset2, out2);
            out.close();
            JOptionPane.showMessageDialog(null, "导出成功!");
            System.out.println("excel导出成功!");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}View Code
 

    不行,头有点晕^_^。呵呵,又是泛型,又是反射,又是正则表达式,又是重载,还有多参数列表和POI API。一下子蹦出来,实在让人吃不消。不管了,顶住看效果先。在本地运行后,我们发现在E://下生成了两份excel文件:学生记录和图书记录,并且中文,数字,颜色,日期,图片等等一且正常。恩,太棒了。有人看到这里开始苦脸了:喂,我怎么一运行就报错啊!呵呵,看看什么错吧!哦,找不到文件,也就是说你没有book.jpg嘛。好,拷贝一张小巧的图书图片命名为book.jpg放置到当前工程下吧。注意,您千万别把张桌面大小的图片丢进去了^_^!看到效果了吧。现在我们再来简单梳理一下代码,实际上上面就做了一个导出excel的方法和一个本地测试main()方法。并且代码的结构也很清晰,只是涉及的知识点稍微多一点。大家细心看看注释,结合要完成的功能,应该没有太大问题的。好啦,吃杯茶,擦把汗,总算把这个类消化掉,你又进步了。咦,你不是说是在WEB环境下导出的吗?别急,因为导出就是一个下载的过程。我们只需要在服务器端写一个Jsp或者Servlet组件完成输出excel到浏览器客户端的工作就好了。我们以Servlet为例,还是看代码吧:

Export.java
package org.leno.export.util;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

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

/**
 * @author leno 使用servlet导出动态生成的excel文件,数据可以来源于数据库
 *        这样,浏览器客户端就可以访问该servlet得到一份用java代码动态生成的excel文件
 */
public class Export extends javax.servlet.http.HttpServlet {
    static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        File file = new File(getServletContext()
                .getRealPath("WEB-INF/book.jpg"));
        response.setContentType("octets/stream");
        response.addHeader("Content-Disposition",
                "attachment;filename=test.xls");
        // 测试图书
        ExportExcel ex = new ExportExcel();
        String[] headers = { "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 dataset = new ArrayList();
        try {
            BufferedInputStream bis = new BufferedInputStream(
                    new FileInputStream(file));
            byte[] buf = new byte[bis.available()];
            while ((bis.read(buf)) != -1) {
                // 将图片数据存放到缓冲数组中
            }
            dataset.add(new Book(1, "jsp", "leno", 300.33f, "1234567", "清华出版社",
                    buf));
            dataset.add(new Book(2, "java编程思想", "brucl", 300.33f, "1234567",
                    "阳光出版社", buf));
            dataset.add(new Book(3, "DOM艺术", "lenotang", 300.33f, "1234567",
                    "清华出版社", buf));
            dataset.add(new Book(4, "c++经典", "leno", 400.33f, "1234567",
                    "清华出版���", buf));
            dataset.add(new Book(5, "c#入门", "leno", 300.33f, "1234567",
                    "汤春秀出版社", buf));
            OutputStream out = response.getOutputStream();
            ex.exportExcel(headers, dataset, out);
            out.close();
            System.out.println("excel导出成功!");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

写完之后,如果您不是用eclipse工具生成的Servlet,千万别忘了在web.xml上注册这个Servelt。我用的是Eclipse工具生成的servlet,自动注册了servlet,注册内容如下:

 
    Export
    /servlet/Export
 

jsp页面里的分页表格导出Excel_第2张图片


而且同样的,拷贝一张小巧的图书图片命名为book.jpg放置到当前WEB根目录的/WEB-INF/下。部署好web工程,用浏览器访问Servlet看下效果吧!

我的访问地址是:http://localhost:8080/TestExportExcel/servlet/Export。看看是不是下载成功了。呵呵,您可以将下载到本地的excel报表用打印机打印出来,这样您就大功告成了。完事了我们就思考:我们发现,我们做的方法,不管是本地调用,还是在WEB服务器端用Servlet调用;不管是输出学生列表,还是图书列表信息,代码都几乎一样,而且这些数据我们很容器结合后台的DAO操作数据库动态获取。恩,类和方法的通用性和灵活性开始有点感觉了。好啦,祝您学习愉快!


生成的两个excel文档内容分别如下,第一个是测试学生,第二个是测试图书。

 

jsp页面里的分页表格导出Excel_第3张图片


Student.java和Book.java是Model的javabean,ExportExcel.java是Model的java类,Export.java是controller。

本篇文章来源于 Linux公社网站(www.linuxidc.com)  原文链接:http://www.linuxidc.com/Linux/2014-10/108119.htm

本篇文章来源于 Linux公社网站(www.linuxidc.com)  原文链接:http://www.linuxidc.com/Linux/2014-10/108119p2.htm

上述代码能够实现,但是我还需要修改。发现自己逻辑思路的问题是一直觉得不管哪种方法都是从页面把数据提取出来,但是POI方法一定是从数据库中提取的数据,所以针对这个逻辑思路的修正,我在RenshiBeanBO中写了一个读取数据库全部数据的构造函数,然后在servlet中用循环的方法写入全部数据。

for(int i=0;i
导出成功!





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