多文件上传的后台代码实现

来源：互联网发布：要怎么加盟农村淘宝编辑：程序博客网时间：2024/05/17 06:28

多文件上传后台代码的实现：

/**
* 文件上传实例
* @author samLee
*
*/
public class UploadPhotoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public UploadPhotoServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
@SuppressWarnings("unchecked")
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//文件存放的目录
File tempDirPath =new File(request.getSession().getServletContext().getRealPath("/")+"\\upload\\");
if(!tempDirPath.exists()){
tempDirPath.mkdirs();
}
//创建磁盘文件工厂
DiskFileItemFactory fac = new DiskFileItemFactory();
//创建servlet文件上传组件
ServletFileUpload upload = new ServletFileUpload(fac);
//文件列表
List fileList = null;
//解析request从而得到前台传过来的文件
try {
fileList = upload.parseRequest(request);
} catch (FileUploadException ex) {
ex.printStackTrace();
return;
}
//保存后的文件名
String imageName = null;
//便利从前台得到的文件列表
Iterator<FileItem> it = fileList.iterator();
while(it.hasNext()){
FileItem item = it.next();
//如果不是普通表单域，当做文件域来处理
if(!item.isFormField()){
imageName = new Date().getTime()+Math.random()*10000+item.getName();
BufferedInputStream in = new BufferedInputStream(item.getInputStream());
BufferedOutputStream out = new BufferedOutputStream(
new FileOutputStream(new File(tempDirPath+"\\"+imageName)));
Streams.copy(in, out, true);
}
}
//
PrintWriter out = null;
try {
out = encodehead(request, response);
} catch (IOException e) {
e.printStackTrace();
}
//这个地方不能少，否则前台得不到上传的结果
out.write("1");
out.close();
}
/**
* Ajax辅助方法获取 PrintWriter
* @return
* @throws IOException
* @throws IOException
* request.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");
*/
private PrintWriter encodehead(HttpServletRequest request,HttpServletResponse response) throws IOException{
request.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");
return response.getWriter();
}
}

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