無論使用poi還是使用jxl導出excel都需要用到流
一種是outputstrean，另一種fileoutputstream
第一種：
如果想要彈出保存的提示框必須加入下列三句
response.setContentType("application/vnd.ms-excel; charset=utf-8");
response.setHeader("Content-Disposition","attachment;filename="+filename);
response.setCharacterEncoding("utf-8");
OutputStream os=response.getOutputStream();
在使用第一種的時候，我用的ajax請求。導致excel無法導出，最後我直接請求可以導出（document.location.href="${pageContext.request.contextPath}/tran/export.do?"）
原因是：ajax也用到了response.getWriter()方法 要將 數據結果回傳，這裏 我雖然 放棄了 回傳的寫入流writer 參數， 但是ajax還是會默認的去掉用，把流已經佔用了，當然返回不了任何東西了。
第二種：
action中使用FileOutputStream fos=new FileOutputStream(file);
此時可以使用ajax請求，在導出成功後返回文件路徑，在頁面中使用window.open(path);即可打開導出的excel文件
jsp頁面：
function exportExcel(){
var ids = [];
var rows = $('#dbgrid').datagrid('getSelections');
if (rows.length < 1) {
$.messager.alert('提示', '<br>請選中您要導出的記錄!', 'info');
return;
}
for (var i = 0; i < rows.length; i++) {
ids.push(rows[i][getId()]);
}
//console.log("---ids---"+ids.join(","))
location.href = "${path}/admin/export/export.do?ids="+ids.join(",");
}
Action:
package com.shangyu.action.dsz;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.shangyu.common.util.SpringContextHelper;
import com.shangyu.entity.dsz.DispatchOrder;
import com.shangyu.entity.dsz.DispatchParam;
import com.shangyu.service.dsz.DispatchOrderService;
import com.shangyu.service.dsz.DispatchParamService;
import com.shangyu.service.system.SysUserService;
/**
* @desc 導出Excel
* @author hykang
*
*/
@Controller
@RequestMapping("/admin/export")
public class ExportController {
@Resource
private DispatchOrderService dispatchOrderService;
@Resource
private DispatchParamService dispatchParamService;
@Resource
private SysUserService sysUserService;
@SuppressWarnings("deprecation")
@RequestMapping("export.do")
public void exportList(HttpServletRequest req,HttpServletResponse response) throws Exception{
String ids = req.getParameter("ids");
String[] str=ids.split(",");
String[] ids1=new String[str.length];
List<DispatchOrder> orderlist = new ArrayList<>();
for(int i=0;i<str.length;i++){
ids1[i]=str[i];
DispatchOrder entity = dispatchOrderService.getById(ids1[i]);
orderlist.add(entity);
}
HSSFWorkbook wb=new HSSFWorkbook();
HSSFSheet sheet=wb.createSheet("派工單數據彙總");
HSSFRow row=sheet.createRow(0);
//創建單元格，並設置值表頭 設置表頭居中
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 創建一個居中格式
//style.setWrapText(true);//允許自動換行
//表頭
String[] headers={"派工單編號","部門名稱","負責人","創建時間","派工時間","合計工時"};
//填充表頭
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);
}
for (int i = 0; i < orderlist.size(); i++) {
row = sheet.createRow(i + 1);
row.setHeightInPoints(18); //設置行高
DispatchOrder record = orderlist.get(i);
String createtime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(record.getCreateTime());
String disptchtime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(record.getDispatchTime());
row.createCell(0).setCellValue(record.getDispatchCode());
sheet.setColumnWidth(0, (record.getDispatchCode().getBytes().length + 4)*256);
if(org.apache.commons.lang3.StringUtils.isNotEmpty(getName(record.getDeptName()) )){
row.createCell(1).setCellValue(getName(record.getDeptName()));
sheet.setColumnWidth(0, (record.getDispatchCode().getBytes().length + 4)*256);
}
if(org.apache.commons.lang3.StringUtils.isNotEmpty(getName(record.getManager()))){
row.createCell(2).setCellValue(getName(record.getManager()));
sheet.setColumnWidth(1, (getName(record.getDeptName()).getBytes().length + 4)*256);
}
row.createCell(3).setCellValue(createtime);
sheet.setColumnWidth(3, (createtime.getBytes().length + 4)*256);
row.createCell(4).setCellValue(disptchtime);
sheet.setColumnWidth(4, (disptchtime.getBytes().length + 4)*256);
if(org.apache.commons.lang3.StringUtils.isNotEmpty(String.valueOf(record.getTotalWork()))){
row.createCell(5).setCellValue(String.valueOf(record.getTotalWork()));
}
}
//sheet.setDefaultColumnWidth(18); //爲全部列的列寬設置默認值
String filename=new SimpleDateFormat("yyyy年MM月dd日 HH時mm分ss秒").format(new Date())+".xls";
//response.reset();//一般情況可以不寫
//response.setHeader("Content-disposition", "attachment;filename="+toUtf8String(fileName));//字符串轉碼
response.setHeader("Content-Disposition", "attachment;filename="
+new String(filename.getBytes("utf-8"),"iso8859-1"));
response.setHeader("Connection", "close");
response.setHeader("Content-Type", "application/vnd.ms-excel");
wb.write(response.getOutputStream());
}
public static String toUtf8String(String s){
StringBuffer sb = new StringBuffer();
for (int i=0;i<s.length();i++){
char c = s.charAt(i);
if (c >= 0 && c <= 255){sb.append(c);}
else{
byte[] b;
try { b = Character.toString(c).getBytes("utf-8");}
catch (Exception ex) {
System.out.println(ex);
b = new byte[0];
}
for (int j = 0; j < b.length; j++) {
int k = b[j];
if (k < 0) k += 256;
sb.append("%" + Integer.toHexString(k).toUpperCase());
}
}
}
return sb.toString();
}
public static String getName(String id){
String name = "";
DispatchParamService dispatchParamService = SpringContextHelper.getBean(DispatchParamService.class);
try {
DispatchParam param = dispatchParamService.getById(id);
name = param.getParamName();
} catch (Exception e) {
e.printStackTrace();
}
return name;
}
}
參考文檔：
Springmvc和poi3.9導出excel並彈出下載框