Java项目实战 - 图片Server管理和图片上传

要分布式的环境中，一般会配置一个专门的图片Server。

图片服务器

• Nginx作为http服务
• ftp上传图片 - linux自带：vsftpd。

Nginx和vsftpd都需要安装配置，不做说明。

配置信息

文件上传解析器

<!-- 定义文件上传解析器 -->
<bean id="multipartResolver"    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!-- 设定默认编码 -->
    <property name="defaultEncoding" value="UTF-8"></property>
    <!-- 设定文件上传的最大值5MB，5*1024*1024 -->
    <property name="maxUploadSize" value="5242880"></property>
</bean>

创建公共Properties

在properties下创建resource.properties文件

#FTP配置
FTP_IP=192.168.220.133
FTP_PORT=21
FTP_USERNAME=ftpuser
FTP_PASSWORD=ftpuser
FTP_BASE_PATH=/home/ftpuser/www/images

#图片Several配置
IMAGE_BASE_PATH=http://192.168.220.133/images

并修改<context:property-placeholder location="classpath:properties/db.properties" /> to <context:property-placeholder location="classpath:properties/*.properties" />

Service

封装了一个公共的File Upload的方法。

@Service
public class PictureServiceImpl implements PictureService {

	//利用这种方式来取resource.properties的配置
	@Value("${FTP_IP}")
	private String FTP_IP;
	@Value("${FTP_PORT}")
	private Integer FTP_PORT;
	@Value("${FTP_USERNAME}")
	private String FTP_USERNAME;
	@Value("${FTP_PASSWORD}")
	private String FTP_PASSWORD;
	@Value("${FTP_BASE_PATH}")
	private String FTP_BASE_PATH;
	@Value("${IMAGE_BASE_PATH}")
	private String IMAGE_BASE_PATH;
	

	@Override
	public Map uploadPicture(MultipartFile uploadFile) {
		Map resultMap = new HashMap<>();
		
		try {
			// 生成新文件名
			String oldname = uploadFile.getOriginalFilename();
			String newname = UUID.randomUUID().toString();
			newname = newname + oldname.substring(oldname.lastIndexOf("."));
			
			//上传图片
			String filepath = new DateTime().toString("/yyyy/MM/dd");
			boolean result = FtpUtil.uploadFile(FTP_IP, FTP_PORT, FTP_USERNAME, FTP_PASSWORD, FTP_BASE_PATH, 
					filepath, newname, uploadFile.getInputStream());
			if(!result){
				resultMap.put("error", 1);
				resultMap.put("message", "File upload failed");
				return resultMap;
			}
			resultMap.put("error", 0);
			resultMap.put("url", IMAGE_BASE_PATH + filepath + "/" + newname);
			return resultMap;
			
		} catch (Exception e) {
			resultMap.put("error", 1);
			resultMap.put("message", "File upload failed");
			return resultMap;
		}		
	}
}

Controller

@Controller
public class PictureController {
	
	@Autowired
	private PictureService pictureService;
	
	@RequestMapping("/pic/upload")
	@ResponseBody
	public String pictureUpload(MultipartFile uploadFile){
		Map result = pictureService.uploadPicture(uploadFile);
		return JsonUtils.objectToJson(result);//处理浏览器兼容性
	}
}

运行结果