java使用commons-fileupload进行文件上传

java中使用文件上传时需要使用特定的类库，这里使用commons-files类库进行文件上传,在http://commons.apache.org/proper/commons-fileupload/上下载commons-io和commons-files类库

        DiskFileUpload upload = new DiskFileUpload();
        upload.setHeaderEncoding("UTF-8");
        List<FileItem> list;
        try {
            list = upload.parseRequest(request);
            //  遍历上传的文件
            for(FileItem item:list){
                // 判断文件类型
                if(item.isFormField()){
                    String name = item.getName();
                    String value = item.getString("UTF-8");
                }
                else{
                    // 获取上传文件
                    File remoteFile = new File(new String(item.getName().getBytes(),"UTF-8"));
                    // 创建保存文件
                    File file1 = new File(request.getContextPath()+"/attachment",remoteFile.getName());
                    file1.getParentFile().mkdirs();
                    file1.createNewFile();

                     // 创建流进行操作
                    InputStream inputStream = item.getInputStream();
                    OutputStream outputStream = new FileOutputStream(file1);
                    try {
                            int len = ;
                            byte[] bt = new byte[];
                            while( (len  = inputStream.read(bt)) > -){
                                outputStream.write(bt,,len);
                            }

                    } finally {
                        // 关闭流
                        inputStream.close();
                        outputStream.close();
                    }