服务端实现
第一步:查询所有的分区数据
第二步:使用POI将数据写到Excel文件中
第三步:使用输出流进行文件下载
package com.learn.bos.web.action;
import java.io.IOException;
import java.util.List;
import javax.annotation.Resource;
import javax.servlet.ServletOutputStream;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.struts2.ServletActionContext;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Restrictions;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import com.learn.bos.domain.Region;
import com.learn.bos.domain.Subarea;
import com.learn.bos.service.ISubareaService;
import com.learn.bos.utils.FileUtils;
import com.learn.bos.web.action.base.BaseAction;
@Controller
@Scope("prototype")
public class SubareaAction extends BaseAction<Subarea>{
@Resource
private ISubareaService subareaService;
/**
* 添加分区
*/
public String add(){
subareaService.save(model);
return LIST;
}
/**
* 分区数据导出功能
* @throws IOException
*/
public String exportXls() throws IOException{
//第一步:查询所有的分区数据
List<Subarea> list = subareaService.findAll();
//第二步:使用POI将数据写到Excel文件中
//在内存中创建一个Excel文件
HSSFWorkbook workbook = new HSSFWorkbook();
//创建一个标签页
HSSFSheet sheet = workbook.createSheet("分区数据");
//创建标题行
HSSFRow headRow = sheet.createRow(0);
headRow.createCell(0).setCellValue("分区编号");
headRow.createCell(1).setCellValue("开始编号");
headRow.createCell(2).setCellValue("结束编号");
headRow.createCell(3).setCellValue("位置信息");
headRow.createCell(4).setCellValue("省市区");
for (Subarea subarea : list) {
HSSFRow dataRow = sheet.createRow(sheet.getLastRowNum() + 1);
dataRow.createCell(0).setCellValue(subarea.getId());
dataRow.createCell(1).setCellValue(subarea.getStartnum());
dataRow.createCell(2).setCellValue(subarea.getEndnum());
dataRow.createCell(3).setCellValue(subarea.getPosition());
dataRow.createCell(4).setCellValue(subarea.getRegion().getName());
}
//第三步:使用输出流进行文件下载(一个流、两个头)
String filename = "分区数据.xls";
String contentType = ServletActionContext.getServletContext().getMimeType(filename);
ServletOutputStream out = ServletActionContext.getResponse().getOutputStream();
ServletActionContext.getResponse().setContentType(contentType);
//获取客户端浏览器类型
String agent = ServletActionContext.getRequest().getHeader("User-Agent");
filename = FileUtils.encodeDownloadFilename(filename, agent);
ServletActionContext.getResponse().setHeader("content-disposition", "attachment;filename="+filename);
workbook.write(out);
return NONE;
}
}
package com.learn.bos.utils;
import java.io.IOException;
import java.net.URLEncoder;
import sun.misc.BASE64Encoder;
public class FileUtils {
/**
* 下载文件时,针对不同浏览器,进行附件名的编码
*
* @param filename
* 下载文件名
* @param agent
* 客户端浏览器
* @return 编码后的下载附件名
* @throws IOException
*/
public static String encodeDownloadFilename(String filename, String agent)
throws IOException {
if (agent.contains("Firefox")) { // 火狐浏览器
filename = "=?UTF-8?B?"
+ new BASE64Encoder().encode(filename.getBytes("utf-8"))
+ "?=";
filename = filename.replaceAll("\r\n", "");
} else { // IE及其他浏览器
filename = URLEncoder.encode(filename, "utf-8");
filename = filename.replace("+"," ");
}
return filename;
}
}