SSM框架批量下载

批量下载

首先建立一个类

DbToExcel.Java

	/**
	 * 下载
	 */
	
	public  void dBToExcel1(List <Course> list,String[] titles, String file)
			throws Exception {
	
		WritableWorkbook wwb = null;
		WritableSheet ws = null;
		wwb = Workbook.createWorkbook(new File(file));
		ws = wwb.createSheet("sheet1", 0);

		for (int i = 0; i < titles.length; i++) {
			ws.addCell(new Label(i, 0, titles[i]));
		}
		int count = 1;
		Course course=new Course();
		for(int i=0;i<list.size();i++){
			course=list.get(i);
			ws.addCell(new Label(0, i+1,String.valueOf(course.getId())));
			ws.addCell(new Label(1, i+1,course.getName() ));
			ws.addCell(new Label(2, i+1,String.valueOf(course.getHour() )));	
//（0，i）对应表格的第1行第i列	
		}		
		wwb.write();

		if (wwb != null)
			wwb.close();
	

	}

Dao层：

	<select id="findCourse1"  resultType="course"  parameterType="course">
		select * from tb_course
		<where>
			<if test="name!=null and name!=''">
				<bind name="pattern_name" value="'%'+_parameter.getName()+'%'" />
				name like #{pattern_name}
			</if>
			<if test="hour!=null and hour!=0 and hour!=''">
				and hour=#{hour}
			</if>
		</where>
	</select>

public List<Course> findCourse1(RowBounds rowBounds,Course course);

服务层：

	public Page<Course> findCoursePage(Integer page,Integer rows, Course course);

	@Override
	public Page<Course> findCoursePage(Integer page, Integer rows) {
		// TODO Auto-generated method stub
		RowBounds rowBounds = new RowBounds((page-1) * rows, rows);
//		// 查询列表
		List<Course> courses =courseDao.findCourse(rowBounds);
//		
//
//		// 查询课程列表总记录数
		Integer count = courseDao.findCourseCount();
//		// 创建Page返回对象
		Page<Course> result = new Page<Course>();
		result.setPage(page);
		result.setRows(courses);
		result.setSize(rows);
		result.setTotal(count);
		return result;
	}

控制层

	@Autowired
	private CourseService courseService;
	@Autowired
	private DbToExcel dbToExcel1;
	public DbToExcel getDbToExcel1() {
		return dbToExcel1;
	}
	public void setDbToExcel1(DbToExcel dbToExcel1) {
		this.dbToExcel1 = dbToExcel1;
	}

/**
	 * 下载
	 */
	@RequestMapping("/downloadCourse.action")
	public ResponseEntity<byte[]> downloadCourse(Model model,Integer[] courseId,HttpServletRequest request)throws Exception {
		List<Course> courses=courseService.findCourseByIds(courseId);
		String[] titles={"课程编号","课程名","学时"};
		String path="D:/test/";
		String filename="test.xls";
		File filePath = new File(path);
		try {
			
			if (!filePath.exists()) {
				filePath.mkdirs();
			}
			File testFile = new File(path+filename);
			if(!testFile .exists()) {
			testFile.createNewFile();
			System.out.println("测试文件不存在");
			}
			
			dbToExcel1.dBToExcel1(courses,titles,path+filename);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		 File file = new File(path+filename);
		    // 对文件名编码，防止中文文件乱码
		  filename = this.getFilename(request, filename);
		    // 设置响应头
		    HttpHeaders headers = new HttpHeaders();
		    // 通知浏览器以下载的方式打开文件
		    headers.setContentDispositionFormData("attachment", filename);
		    // 定义以流的形式下载返回文件数据
		    headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
		    // 使用Sring MVC框架的ResponseEntity对象封装返回下载数据
		   return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),
				   headers,HttpStatus.OK);
	}
	public String getFilename(HttpServletRequest request,
			 String filename) throws Exception { 
			// IE不同版本User-Agent中出现的关键词
			String[] IEBrowserKeyWords = {"MSIE", "Trident", "Edge"};  
			// 获取请求头代理信息
			String userAgent = request.getHeader("User-Agent");  
			for (String keyWord : IEBrowserKeyWords) { 
			if (userAgent.contains(keyWord)) { 
			//IE内核浏览器，统一为UTF-8编码显示
			return URLEncoder.encode(filename, "UTF-8");
			}
			}  
			//火狐等其它浏览器统一为ISO-8859-1编码显示
			return new String(filename.getBytes("UTF-8"), "ISO-8859-1");  
		}  
	

前端调用：

<form action="${pageContext.request.contextPath }/downloadCourse.action" method="post">
					<table class="table  table-hover">
						<thead>
							<tr>
								<th></th>
								<th>课程编号</th>
								<th>课程名字</th>
								<th>课时</th>
								<th>状态</th>
							</tr>
						</thead>
						<tbody>
						
							<c:forEach var="course" items="${page.rows}" varStatus="status" >
<%-- 								<tr <c:if test="${status.count%2=='0'}">class="success"</c:if>> --%>
									<tr>
									<td><input type="checkbox" name="courseId" value="${course.id }"></td>
									<td>
										<c:out value="${course.id }"/>
									</td>
									<td>
										<c:out value="${course.name }"/>
									</td>
									<td>
										<c:out value="${course.hour }"/>
									</td>
									
									<td>
										<a href="${pageContext.request.contextPath }/selectCourse1.action?courseId=${course.id }">选课 </a>
									</td>
								</tr>
							</c:forEach>
						</tbody>
					</table>
					<input type="submit" value="下载">
					</form>