Java文件上传细讲（2）

ServletInputStream inputStream = request.getInputStream();
        byte[] bytes = new byte[1024];
        int len = 0;
        while ((len = inputStream.read(bytes)) > 0) {
            System.out.println(new String(bytes, 0, len));
        }

 try{
            //1.得到解析器工厂
            DiskFileItemFactory factory = new DiskFileItemFactory();
            //2.得到解析器
            ServletFileUpload upload = new ServletFileUpload(factory);
            //3.判断上传表单的类型
            if(!upload.isMultipartContent(request)){
                //上传表单为普通表单，则按照传统方式获取数据即可
                return;
            }
            //为上传表单，则调用解析器解析上传数据
            List<FileItem> list = upload.parseRequest(request);  //FileItem
            //遍历list，得到用于封装第一个上传输入项数据fileItem对象
            for(FileItem item : list){
                if(item.isFormField()){
                    //得到的是普通输入项
                    String name = item.getFieldName();  //得到输入项的名称
                    String value = item.getString();
                    System.out.println(name + "=" + value);
                }else{
                    //得到上传输入项
                    String filename = item.getName();  //得到上传文件名  C:\Documents and Settings\ThinkPad\桌面\1.txt
                    filename = filename.substring(filename.lastIndexOf("\\")+1);
                    InputStream in = item.getInputStream();   //得到上传数据
                    int len = 0;
                    byte buffer[]= new byte[1024];
                    String savepath = this.getServletContext().getRealPath("/upload");
                    FileOutputStream out = new FileOutputStream(savepath + "\\" + filename);  //向upload目录中写入文件
                    while((len=in.read(buffer))>0){
                        out.write(buffer, 0, len);
                    }
                    in.close();
                    out.close();
                }
            }
        }catch (Exception e) {
            e.printStackTrace();
        }