一、在这里主要贴出struts中的配置及Action的写法，至于持久层和业务层就不再贴出。
二、使用的是poi-3.2.jar实现Excel数据导出
三、struts.xml配置文件中的配置
<action name="chapterAction_*" class="chapterAction" method="{1}">
<result name="success" type="stream">
<param name="contentType">application/vnd.ms-excel</param>
<param name="inputName">excelStream</param>
<param name="contentDisposition">attachment;filename="${fileName}.xls"</param>
<param name="bufferSize">1024</param>
</result>
<result name="error">/WEB-INF/page/academic/error.jsp</result>
</action>
四、导出数据封装的类
public class ExpChapter {
//章节名称
private String chapterName;
//课程名称
private String courseName;
//Excel表头
private String[] columnNames = new String[] { "章节名称","课程名称" };
//方法名称数组
private String[] columnMethods = new String[] { "getChapterName","getCourseName" };
//省略get 和 set 方法
}
五、Action中具体代码实现
//id数组
private String[] chapterIds;
private InputStream excelStream;
private String fileName;
@Resource(name = ChapterService.BEAN_NAME)
private ChapterService chapterService;
//省略get 和 set 方法
public String exp() throws Exception{
if (null != chapterIds) {
//从数据库查询出需要的数据
List<Chapter> chapters = chapterService.find(chapterIds);
//导出数据集合
List<ExpChapter> ecs = new ArrayList<ExpChapter>();
for (Chapter chapter : chapters) {
ExpChapter ec = new ExpChapter();
ec.setChapterName(chapter.getChapterTitle());
ec.setCourseName(chapter.getCourse().getCourseName());
ecs.add(ec);
}
//创建Excel
HSSFWorkbook workbook = getWorkbook(ecs);
if (workbook != null) {
try {
Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH) + 1;
String month_ = new String("" + month);
if (month < 10) {
month_ = "0" + month;
}
int day = c.get(Calendar.DAY_OF_MONTH);
String day_ = new String("" + day);
if (day < 10) {
day_ = "0" + day;
}
// 第四步：将工作簿写入最上面定义的InputStream流——名称为excelStream，这个名字对应struts.xml中配置的inputName参数
this.workbook2InputStream(workbook, year + "-" + month_
+ "-" + day_ + "");
return SUCCESS;
} catch (IOException e) {
e.printStackTrace();
request.setAttribute("message", "创建Excel失败");
return ERROR;
}
} else {
System.out.println("创建失败");
return ERROR;
}
}
return ERROR;
}
/*
* 将Workbook写入到InputStream
*/
private void workbook2InputStream(HSSFWorkbook workbook,String fileName) throws Exception{
this.fileName = fileName; //设置fileName
ByteArrayOutputStream baos = new ByteArrayOutputStream();
workbook.write(baos);
baos.flush();
byte[] aa = baos.toByteArray();
excelStream = new ByteArrayInputStream(aa, 0, aa.length);
baos.close();
}
/*
* 将list转换为Excel工作表
*/
private HSSFWorkbook getWorkbook(List<ExpChapter> expChapters)
throws SecurityException, NoSuchMethodException,
IllegalArgumentException, IllegalAccessException,
InvocationTargetException {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("sheet1");
String[] columnNames;
String[] columnMethods;
ExpChapter c = expChapters.get(0);
columnNames = c.getColumnNames();
columnMethods = c.getColumnMethods();
HSSFRow row = sheet.createRow(0);
HSSFCell cell;
for (int i = 0; i < columnNames.length; i++) {
cell = row.createCell(i); // 创建第i列
cell.setCellValue(new HSSFRichTextString(columnNames[i]));
}
// 下面是输出各行的数据
for (int i = 0; i < expChapters.size(); i++) {
c = expChapters.get(i);
row = sheet.createRow(i + 1);// 创建第i+1行
for (int j = 0; j < columnMethods.length; j++) {
cell = row.createCell(j);// 创建第j列
Method method;
method = c.getClass().getMethod(columnMethods[j]); // 这里用到了反射机制，通过方法名来取得对应方法返回的结果对象
Object obj = method.invoke(c);
cell.setCellValue(obj.toString());
}
}
return workbook;
}
六、页面内容省略
七、说明：代码不能直接运行，只是贴出主要部分。