工具

smartupload.jar

使用

页面部分

• 必须使用POST提价
• 表单属性必须有enctype="multipart/form-data"

<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>

文件上传

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(); 
        String url="uploadfile/"+filename; 
        //将上传文件保存到指定目录 
        file.saveAs(url, SmartUpload.SAVE_VIRTUAL); 
    } catch (SmartUploadException e) { 
        e.printStackTrace();
    }
}

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")

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();

标签：Web,Java,name,request,su,SmartUpload,上传,response,String
来源： https://www.cnblogs.com/dai-blog/p/14865384.html