上传图片方法的代码片

result 是自己定义的一个返回对象,后面有贴代码片。


    /**
     * 控制层代码
     * 上传文件
     * @return
     * @throws IOException 
     */
    @RequestMapping("uploadFile")
    public Result uploadFile(@AuthenticationPrincipal SecurityUser user,MultipartFile file) throws IOException{
        return menuService.uploadFile(file, getMd5ByBytes(file.getBytes()));
    }

    private String getMd5ByBytes(byte[] data) {
        String value = null;
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            md5.update(data);
            BigInteger bi = new BigInteger(1, md5.digest());
            value = bi.toString(16);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
        }

        return value;
    }
//service 代码片
    public Result uploadFile(MultipartFile file,String MD5){
        String rsp = "";
        try {
        //http://api.file.oss.xxxx.com/upload
            rsp = ConnectionTools.doPostForFile("上传接口地址", file, MD5);
            JSONObject jsonObj = JSONObject.fromObject(rsp);
            if(jsonObj.getInt("code") == 1){
                String shortId = jsonObj.getString("data");
                return new Result(0,"文件上传成功",shortId);
            }else{
                return new Result(1,"文件上传失败");
            }
        } catch (Exception e) {
            return new Result(1,"文件上传失败");
        }
    }

//service 上传工具代码片
public static String doPostForFile(String url, MultipartFile file, String MD5) {
        // 响应内容
        String result = "";

        // 定义http客户端对象--httpClient
        HttpClient httpClient = new HttpClient();
        httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(1000*8);
        httpClient.getHttpConnectionManager().getParams().setSoTimeout(1000*8);
        // 定义并实例化客户端链接对象-postMethod
        PostMethod postMethod = new PostMethod(url);
        postMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "utf-8");
        try {
            // 设置http的头
            postMethod.setRequestHeader("ContentType", "application/x-www-form-urlencoded;charset=UTF-8");
            StringPart stringpart = new StringPart("MD5", MD5);

            byte[] buffer =  file.getBytes();  
            FilePart filepart = new FilePart("file", new ByteArrayPartSource("file", buffer));
            MultipartRequestEntity mrp = new MultipartRequestEntity(new Part[] { stringpart, filepart },postMethod.getParams());
            postMethod.setRequestEntity(mrp);

            // 定义访问地址的链接状态
            int statusCode = 0;
            try {
                // 客户端请求url数据
                statusCode = httpClient.executeMethod(postMethod);
            } catch (Exception e) {
                e.printStackTrace();
            }

            // 请求成功状态-200
            // if (statusCode == HttpStatus.SC_OK) {
            try {
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(postMethod.getResponseBodyAsStream(), "utf-8"));
                String msg = null;
                while ((msg = reader.readLine()) != null) {
                    result += msg;
                }
                return result;
            } catch (IOException e) {
                e.printStackTrace();
            }
            // } else {
            System.out.println(result);
            if (statusCode != HttpStatus.SC_OK) {
                result = "";
            }
            // }
        } catch (Exception e) {
            e.getMessage();
        } finally {
            // 释放链接
            postMethod.releaseConnection();
            httpClient.getHttpConnectionManager().closeIdleConnections(0);
        }
        return result;
    }

result 代码片

    public class Result implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    /**
     * 0:正确
     * 1:业务异常
     * 2:数据格式异常
     * 3:token失效
     * ...
     */
    protected Integer code = 0;
    /**
     * 返回的结果信息
     */
    protected String msg = "";
    /**
     * 扩展信息
     */
    protected Object ext = "";

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Object getExt() {
        return ext;
    }

    public void setExt(Object ext) {
        this.ext = ext;
    }

    /**
     * 构造函数
     * @param code
     * @param msg 
     * @param data
     */
    public Result(Integer code,String msg){
        this.code = code;
        this.msg = msg;
    }
    public Result(Integer code,String msg,Object ext,long total){
        Map<String,Object> t = new ConcurrentHashMap<>();
        t.put("total", total);
        t.put("data", ext);
        this.ext = t;
    }

    public Result(BindingResult result){
        this.code=2;
        this.msg="数据格式错误";
        if(result.hasErrors())
        {
            List<FieldError> list = result.getFieldErrors();
            List<Map<String,String>> _tempList = new ArrayList<Map<String,String>>(0);
            for(int i = 0 ; i < list.size(); i++)
            {
                FieldError fieldError = list.get(i);
                Map<String,String> __tempMap = new HashMap<String,String>(0);
                __tempMap.put("field", fieldError.getField());
                __tempMap.put("error", fieldError.getDefaultMessage());
                _tempList.add(__tempMap);
            }
            this.ext = _tempList;
        }
    }
    /**
     * 构造函数
     * @param code
     * @param msg 
     * @param data
     */
    public Result(Integer code,String msg,Object ext){
        this.msg = msg;
        this.ext = ext;
    }

    /**
     * 无参构造函数
     */
    public Result(){    
    }
}
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