smartupload.jar实现文件上传_smartupload jar包-优快云博客

1.将jar包添加到项目中:smartupload.jar
2.准备上传的页面

<form action="toUpload" method="post" enctype="multipart/form-data" >
书名:<input type="text" name="bookName"/><br>
图片:<input type="file" name="自定义名称"/><br>
<input type="submit" value="提交"/>
</form>

注:(1)form标签中要添加enctype属性
(2)提交方式必须是post
3.开始获取数据,保存文件
实例代码：

public void upload(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
//上传文件
SmartUpload su=new SmartUpload();
//获得pageContext对象
JspFactory factory=JspFactory.getDefaultFactory();
PageContext pagecontext=
factory.
getPageContext(this, request,response,
                null,false,1024,true);
su.initialize(pagecontext);
su.setCharset("utf-8");
//实现文件数据的上传
su.upload();
File file = su.getFiles().getFile(0);
//得到文件的基本信息
String filename=file.getFileName();
String type=file.getContentType();
System.out.println("type="+type);
String url="uploadfile/"+filename;
//将上传文件保存到指定目录
file.saveAs(url, SmartUpload.SAVE_VIRTUAL);
request.setAttribute("filename",filename);
String uname=su.getRequest().getParameter("uname");
System.out.println("uname="+uname);
request.getRequestDispatcher("success.jsp").forward(request,
response);
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

注：(1)此时如果表单中有其他数据时，不能通过request直接获取，需要通过SmartUpload对象获取
String name=su.getRequest().getParameter(“bookName”);
并且该代码要在SmartUpload操作完成后添加
(2)解决乱码:
new String(name.getBytes(“GBK”),“utf-8”)
注:斜杠方向:/
注意:
在这里插入图片描述
smartupload常用方法

文件下载

String name=request.getParameter("filename");
 String url="uploadfile/"+name;
 //将响应的内容设置为通用的二进制流
response.setContentType("application/octet-stream");
//attachment 告诉浏览器以附件的方式下载文件(弹出下载框)
name=URLEncoder.encode(name,"utf-8");
response.addHeader("Content-Disposition","attachment;filename="+name);
request.getRequestDispatcher(url).forward(request, response);
//清空缓冲区:将服务端缓冲区的文件内容,立即权并不传送给客户端
response.flushBuffer();