JSP中将查询结果导出为excel
转自洋葱头的BLOG 原文:http://blog.sina.com.cn/u/3f6efc4a0100063o
如何将JSP中将查询结果导出为Excel,其实可以利用jakarta提供的POI接口将查询结果导出到excel。POI接口是jakarta组织的一个子项目,它包括POIFS,HSSF,HWSF,HPSF,HSLF,目前比较成熟的是HSSF,它是一组操作微软的excel文档的API,现在到达3.0版本,已经能够支持将图片插入到excel里面。下面简要的介绍一下它的用法,在这里http://apache.justdn.org/jakarta/poi/dev/bin/可以下载到它的最新版,下载下来以后,将它解压,并将其中的poi-3.0-alpha1-20050704.jar,poi-contrib-3.0-alpha1-20050704.jar,poi-scratchpad-3.0-alpha1-20050704.jar加入到你的开发环境的classpath中(比如JBUILDER可以点击工具》configure jdks》add……)。在解压的目录中,有一个docs目录是一些文档,其中里面有两个目录特别有用,一个是hssf目录,一个是apidocs目录。我从它的英文文档中摘出一些例子,放在一个java文件里面,加上简单的注释,你可以下载这个java文件下来玩玩。下面是java文件的一部分。
java 代码
- import java.io.*;
- import org.apache.poi.hssf.usermodel.*;
- import org.apache.poi.hssf.util.*;
- import org.apache.poi.hssf.usermodel.contrib.*;
- import javax.imageio.ImageIO;
- public class Main {
- public Main() {
- }
- //演示如何创建一个工作簿
- //用这种方法创建的工作簿有问题,用Excel打开以后发现下面Tab没有选中
- public static void ex1() {
- try {
- org.apache.poi.hssf.usermodel.HSSFWorkbook wb = new org.apache.poi.
- hssf.usermodel.HSSFWorkbook();
- java.io.FileOutputStream fileOut = new java.io.FileOutputStream(
- “ex1.xls”);
- wb.write(fileOut);
- fileOut.close();
- }
- catch (Exception eee) {
- eee.printStackTrace();
- }
- }
- //演示如何创建一个工作表
- public static void ex2() {
- try {
- org.apache.poi.hssf.usermodel.HSSFWorkbook wb = new org.apache.poi.
- hssf.usermodel.HSSFWorkbook();
- org.apache.poi.hssf.usermodel.HSSFSheet sheet1 = wb.createSheet(
- “new sheet”);
- org.apache.poi.hssf.usermodel.HSSFSheet sheet2 = wb.createSheet(
- “second sheet”);
- java.io.FileOutputStream fileOut = new java.io.FileOutputStream(
- “ex2.xls”);
- wb.write(fileOut);
- fileOut.close();
- }
- catch (Exception eee) {
- eee.printStackTrace();
- }
- }
- //演示如何创建一个单元格
- public static void ex3() {
- try {
- org.apache.poi.hssf.usermodel.HSSFWorkbook wb = new org.apache.poi.
- hssf.usermodel.HSSFWorkbook();
- org.apache.poi.hssf.usermodel.HSSFSheet sheet = wb.createSheet(
- “new sheet”);
- // Create a row and put some cells in it. Rows are 0 based.
- org.apache.poi.hssf.usermodel.HSSFRow row = sheet.createRow( (short)
- 0);
- // Create a cell and put a value in it.
- org.apache.poi.hssf.usermodel.HSSFCell cell = row.createCell( (short)
- 0);
- cell.setCellValue(1);
- // Or do it on one line.
- row.createCell( (short) 1).setCellValue(1.2);
- row.createCell( (short) 2).setCellValue(“This is a string”);
- row.createCell( (short) 3).setCellValue(true);
- // Write the output to a file
- java.io.FileOutputStream fileOut = new java.io.FileOutputStream(
- “ex3.xls”);
- wb.write(fileOut);
- fileOut.close();
- }
- catch (Exception eee) {
- eee.printStackTrace();
- }
- }
- //演示如何操作自选图形
- public static void ex27() {
- try {
- HSSFWorkbook wb = new HSSFWorkbook();
- HSSFSheet sheet = wb.createSheet(“new sheet”);
- HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
- HSSFClientAnchor a = new HSSFClientAnchor(0, 0, 1023, 255,
- (short) 1, 0, (short) 1, 0);
- HSSFSimpleShape shape1 = patriarch.createSimpleShape(a);
- shape1.setShapeType(HSSFSimpleShape.OBJECT_TYPE_LINE);
- HSSFTextbox textbox1 = patriarch.createTextbox(
- new HSSFClientAnchor(0, 0, 0, 0, (short) 1, 1, (short) 2, 2));
- textbox1.setString(new HSSFRichTextString(“This is a test”));
- HSSFFont font = wb.createFont();
- font.setItalic(true);
- font.setUnderline(HSSFFont.U_DOUBLE);
- HSSFRichTextString string = new HSSFRichTextString(“Woo!!!”);
- string.applyFont(2, 5, font);
- textbox1.setString(string);
- // Create a shape group.
- HSSFShapeGroup group = patriarch.createGroup(
- new HSSFClientAnchor(0, 0, 900, 200, (short) 2, 2, (short) 2, 2));
- // Create a couple of lines in the group.
- shape1 = group.createShape(new HSSFChildAnchor(3, 3, 500, 500));
- shape1.setShapeType(HSSFSimpleShape.OBJECT_TYPE_LINE);
- ( (HSSFChildAnchor) shape1.getAnchor()).setAnchor( (short) 3, 3,
- 500, 500);
- HSSFSimpleShape shape2 = group.createShape(new HSSFChildAnchor( (short)
- 1, 200, 400, 600));
- shape2.setShapeType(HSSFSimpleShape.OBJECT_TYPE_LINE);
- group.setCoordinates(10, 10, 20, 20); // top-left, bottom-right
- FileOutputStream fileOut = new FileOutputStream(“ex27.xls”);
- wb.write(fileOut);
- fileOut.close();
- }
- catch (Exception eee) {
- eee.printStackTrace();
- }
- }
- //演示如何设定outline
- public static void ex28() {
- try {
- HSSFWorkbook wb = new HSSFWorkbook();
- HSSFSheet sheet1 = wb.createSheet(“new sheet”);
- sheet1.groupRow(5, 14);
- sheet1.groupRow(7, 14);
- sheet1.groupRow(16, 19);
- sheet1.groupColumn( (short) 4, (short) 7);
- sheet1.groupColumn( (short) 9, (short) 12);
- sheet1.groupColumn( (short) 10, (short) 11);
- FileOutputStream fileOut = new FileOutputStream(“ex28.xls”);
- wb.write(fileOut);
- fileOut.close();
- }
- catch (Exception eee) {
- eee.printStackTrace();
- }
- }
- //演示如何设定outline
- public static void ex29() {
- try {
- HSSFWorkbook wb = new HSSFWorkbook();
- HSSFSheet sheet = wb.createSheet(“new sheet”);
- HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
- HSSFClientAnchor a = new HSSFClientAnchor(0, 0, 1023, 255,
- (short) 1, 0, (short) 1, 0);
- HSSFShapeGroup group = patriarch.createGroup(a);
- group.setCoordinates(0, 0, 80 * 4, 12 * 23);
- float verticalPointsPerPixel = a.getAnchorHeightInPoints(sheet) /
- (float) Math.abs(group.getY2() – group.getY1());
- EscherGraphics g = new EscherGraphics(group, wb,
- java.awt.Color.black,
- verticalPointsPerPixel);
- EscherGraphics2d g2d = new EscherGraphics2d(g);
- //drawChemicalStructure( g2d );
- FileOutputStream fileOut = new FileOutputStream(“ex29.xls”);
- wb.write(fileOut);
- fileOut.close();
- }
- catch (Exception eee) {
- eee.printStackTrace();
- }
- }
- //演示如何处理图片
- public static void ex30() {
- try {
- HSSFWorkbook wb = new HSSFWorkbook();
- HSSFSheet sheet = wb.createSheet(“new sheet”);
- HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
- HSSFClientAnchor anchor;
- anchor = new HSSFClientAnchor(0, 0, 0, 255, (short) 2, 2, (short) 4,
- 7);
- anchor.setAnchorType(2);
- patriarch.createPicture(anchor,
- loadPicture(
- “1.jpg”,
- wb));
- FileOutputStream fileOut = new FileOutputStream(“ex30.xls”);
- wb.write(fileOut);
- fileOut.close();
- }
- catch (Exception eee) {
- eee.printStackTrace();
- }
- }
- private static int loadPicture(String filePath, HSSFWorkbook wb) {
- int result = 0;
- try {
- ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
- java.awt.image.BufferedImage bufferImg = ImageIO.read(new File(
- filePath));
- ImageIO.write(bufferImg,“jpg”,byteArrayOut);
- result = wb.addPicture(byteArrayOut.toByteArray(),HSSFWorkbook.PICTURE_TYPE_JPEG);
- }
- catch (Exception e) {
- e.printStackTrace();
- }
- return result;
- }
- }
好好学习一下这些例子,基本上就能利用java对excel进行操作了。
那么JSP中查询页面导出到excel只要在服务器端利用HSSF形成xls文件,然后让用户来下载这些文件就行了。