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();

                    }