Java導出Txt的關鍵代碼

本文主要是採用流的方式直接response,適用於數據量不是很大的情況下。

在struts框架下，方法返回值爲ActionForward並且需要return null：

關鍵代碼如下：

public ActionForward exportProgramSchedule(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response){


List<SignalProgramScheduleBase> list;

list = signalProgramScheduleService.getExportPrograms(sourceId, fromDate, toDate);
int count = list.size();

response.reset(); //清空response
response.setContentType("text/plain;charset=UTF-8");//設置文件輸出類型和編碼
response.addHeader("Content-Disposition", "attachment;filename=" +
dateFormatToStr(fromDate)+"-"+dateFormatToStr(toDate)+".txt");// filename指定默認的名字

OutputStream outSTr = null;
StringBuffer write = new StringBuffer();
String enter = "\r\n";
SignalProgramScheduleBase spBase;

try {
outSTr = response.getOutputStream();//獲得輸出流
String writeDate = dateFormatToStr(fromDate);
write.append("Date:" + writeDate);
write.append(enter);
for (int i = 0; i < count; i++) {
spBase = (SignalProgramScheduleBase) list.get(i);
if(writeDate.equalsIgnoreCase(spBase.getGroupDate())){
write.append(spBase.getStartstr()+"|"+spBase.getTimeLong()+"|"+spBase.getName());
write.append(enter);
}else{
writeDate = spBase.getGroupDate();
write.append("Date:" + writeDate);
write.append(enter);
write.append(spBase.getStartstr()+"|"+spBase.getTimeLong()+"|"+spBase.getName());
write.append(enter);
}
}
outSTr.write(write.toString().getBytes("UTF-8"));
outSTr.flush();
outSTr.close();

} catch (Exception e) {
e.printStackTrace();
}
return null;
}


[b]前臺提交方式如下：[/b]

if (fDate !== null && tDate !== null) {
[b]document.location [/b]= "programSchedule.do?m=exportProgramSchedule&sourceId="
+ selNode.id
+ "&fromDate="
+ fromDate
+ "&toDate=" + toDate;
}