public void wenJianPLCsv(List list, String name) {

try {

File file = new File(url + name + ".csv");

if(!file.exists()){

System.out.println("创建文件！！！");

file.createNewFile();

}

writeFileContent(file, list);

} catch (IOException e1) {

e1.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

}

public static boolean writeFileContent(File file,List list) throws IOException{

Boolean bool = false;

FileWriter fileWriter = null;

try {

fileWriter = new FileWriter(file, true); //应用fileWrite流

StringBuffer buffer = new StringBuffer();

for (int q = 0; q < list.size(); q++) {

buffer.append(list.get(q).getId()+",");

buffer.append(list.get(q).getTime_point()+",");

buffer.append(list.get(q).getAqi()+",");

buffer.append(list.get(q).getArea()+",");

buffer.append(list.get(q).getPosition_name()+",");

buffer.append(list.get(q).getStation_code()+",");

buffer.append(list.get(q).getSO2()+",");

buffer.append(list.get(q).getNO2()+",");

buffer.append(list.get(q).getCO()+",");

buffer.append(list.get(q).getO3()+",");

buffer.append(list.get(q).getPM2_5()+",");

buffer.append(list.get(q).getPM10()+",");

buffer.append(list.get(q).getPrimary_pollutant().replaceAll(",", "，")+",");

buffer.append(list.get(q).getQuality()+" \r\n");

}

bool = true;

fileWriter.append(buffer);//使用文本追加，不覆盖文件原有内容

//fileWriter.write(buffer);//write将覆盖文件原有内容

buffer.delete(0, buffer.length());//删除字符串内容

System.out.println("buffer.toString():"+buffer.toString());

} catch (Exception e) {

e.printStackTrace();

}finally {

if( fileWriter!=null){

fileWriter.close();

}

}

return bool;

}

jsp页面将服务器上的文件下载到本地电脑上

if(request.getAttribute("wenjian")!=null){

String dizhi=request.getAttribute("wenjian").toString();

String name = dizhi.split("/")[4];//文件名

InputStream ins = new FileInputStream(dizhi);//加

BufferedInputStream bins = new BufferedInputStream(ins);//

OutputStream outs = response.getOutputStream();//

BufferedOutputStream bouts = new BufferedOutputStream(outs);

response.reset();

response.setContentType("application/x-msdownload");

response.setHeader(

"Content-Disposition",

4000

"attachment;filename="

+ URLEncoder.encode(name, "UTF-8").replaceAll("\\+", "%20").replaceAll("%28", "\\(").replaceAll("%29", "\\)").replaceAll("%3B", ";").replaceAll("%40", "@").replaceAll("%23", "\\#").replaceAll("%26", "\\&"));

int bytesRead = 0;

byte[] buffer = new byte[8192];

//

while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {

bouts.write(buffer, 0, bytesRead);

}

bouts.flush();//

out.clear();

out= pageContext.pushBody();

ins.close();

bins.close();

outs.close();

bouts.close();

File file = new File(dizhi);//加

file.delete();

}

%>