Java导出Txt的关键代码

本文主要是采用流的方式直接response,适用于数据量不是很大的情况下。

在struts框架下，方法返回值为ActionForward并且需要return null：

关键代码如下：

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");//设置文件输出类型和编码
        response.addHeader("Content-Disposition", "attachment;filename=" +
        dateFormatToStr(fromDate)+"-"+dateFormatToStr(toDate)+".txt");// filename指定默认的名字  
       
        OutputStream outSTr = null;
        StringBuffer write = new StringBuffer();  
        String enter = "\r\n";  
        SignalProgramScheduleBase spBase;
        
        try {  
        outSTr = response.getOutputStream();//获得输出流
        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;
}


前台提交方式如下：

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