【SpringMVC__上传】SpringMVC中实现图片上传

1、导入依赖

	<!-- 文件上传组件 -->
	<dependency>
		<groupId>commons-fileupload</groupId>
		<artifactId>commons-fileupload</artifactId>
		<version>1.3.1</version>
	</dependency>
	<!-- 时间操作组件 -->
	<dependency>
		<groupId>joda-time</groupId>
		<artifactId>joda-time</artifactId>
		<version>2.5</version>
	</dependency>

2、在SpringMVC配置文件中添加文件上传解析器

	<!-- 定义文件上传解析器 -->
	<bean id="multipartResolver"
		  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- 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>

3、resource.properties

FTP_SERVER_IP=172.20.10.8
FTP_SERVER_PORT=21
FTP_SERVER_USERNAME=ftpuser
FTP_SERVER_PASSWORD=123456
FTP_BASE_PATH=/home/ftpuser/www/images
IMAGE_BASE_URL=http://172.20.10.8/images

4、PictureService

import org.springframework.web.multipart.MultipartFile;

public interface PictureService {
    PictureResult uploadFile(MultipartFile uploadFile);
}

@Service
public class PictureServiceImpl implements PictureService {
    @Value("${IMAGE_BASE_URL}")
    private String IMAGE_BASE_URL;
    @Value("${FTP_BASE_PATH}")
    private String FTP_BASE_PATH;

    @Value("${FTP_SERVER_IP}")
    private String FTP_SERVER_IP;
    @Value("${FTP_SERVER_PORT}")
    private Integer FTP_SERVER_PORT;
    @Value("${FTP_SERVER_USERNAME}")
    private String FTP_SERVER_USERNAME;
    @Value("${FTP_SERVER_PASSWORD}")
    private String FTP_SERVER_PASSWORD;

    @Override
    public PictureResult uploadFile(MultipartFile uploadFile) {
        String path = savePicture(uploadFile);
        int code = path.startsWith("error") ? 1 : 0;
        PictureResult result = new PictureResult(code, IMAGE_BASE_URL + path);
        return result;
    }

    private String savePicture(MultipartFile uploadFile) {
        String result = "";
        if (uploadFile.isEmpty()) {
            return null;
        }
        try {
            String oldFileName = uploadFile.getOriginalFilename();
            String newFileName = IDUtils.genImageName() + oldFileName.substring(oldFileName.lastIndexOf("."));
            //要上传到服务器的哪个目录
            String filePath = DateTime.now().toString("/yyyy/MM/dd");

            boolean b = FtpUtil.uploadFile(FTP_SERVER_IP, FTP_SERVER_PORT, FTP_SERVER_USERNAME, FTP_SERVER_PASSWORD,
                    FTP_BASE_PATH, filePath, newFileName, uploadFile.getInputStream());
            if (b) {
                result = filePath + "/" + newFileName;
            } else {
                result = "error:上传失败";
            }

        } catch (Exception e) {
            e.printStackTrace();
            result = "error:" + e.getMessage();
        }
        return result;
    }
}

5、PictureController

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

@Controller
@RequestMapping("/pic")
public class PictureController {

    @Autowired
    private PictureService service;

    @RequestMapping("/upload2")
    @ResponseBody
    public PictureResult upload(MultipartFile uploadFile) {
        PictureResult result = service.uploadFile(uploadFile);
        return result;
    }

    @RequestMapping("/upload")
    @ResponseBody
    public String upload2(MultipartFile uploadFile) {
        PictureResult result = service.uploadFile(uploadFile);
        //为了保证功能的兼容性，需要把Result转换成json格式的字符串。
        String json = JsonUtils.objectToJson(result);
        return json;
    }
}

6、其它

使用FTPClient上传文件

public class PictureResult {

    /**
     * 上传图片返回值，成功：0	失败：1
     */
    private Integer error;
    /**
     * 回显图片使用的url
     */
    private String url;
    /**
     * 错误时的错误消息
     */
    private String message;

    public PictureResult(Integer state, String url) {
        this.url = url;
        this.error = state;
    }

    public PictureResult(Integer state, String url, String errorMessage) {
        this.url = url;
        this.error = state;
        this.message = errorMessage;
    }

    public Integer getError() {
        return error;
    }

    public void setError(Integer error) {
        this.error = error;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

	/**
	 * 图片名生成
	 */
	public static String genImageName() {
		//取当前时间的长整形值包含毫秒
		long millis = System.currentTimeMillis();
		//long millis = System.nanoTime();
		//加上三位随机数
		Random random = new Random();
		int end3 = random.nextInt(999);
		//如果不足三位前面补0
		String str = millis + String.format("%03d", end3);
		
		return str;
	}