//html 页面如下
<div class="form-group">

<label class="col-sm-2 control-label">上传头像</label>

<div class="col-sm-6">

    <input id="appHiddenMain" type="hidden" name="img" value="https://images.gagahi.com/images/default/male.png" />

    <input type="file" id="photo" accept="image/*">

    <img style="width:160px;" src="https://images.gagahi.com/images/default/male.png" id="imgd1" />

</div>

</div>

<script type="text/javascript">

$('#photo').change(function () {

    var _this = $(this)[0],

        _file = _this.files[0],

        fileType = _file.type;

    if (/image\/\w+/.test(fileType)) {

        //提示

        var index = layer.open({

            content: '图片上传中...'

            , skin: 'msg'

        });

        var fileReader = new FileReader();

        fileReader.readAsDataURL(_file);

        fileReader.onload = function (event) {

            var result = event.target.result;   //返回的dataURL

            var image = new Image();

            image.src = result;

            image.onload = function () {  //创建一个image对象，给canvas绘制使用

                var cvs = document.createElement('canvas');

                var scale = 1;

                if (this.width > 1000 || this.height > 1000) {  //1000只是示例，可以根据具体的要求去设定

                    if (this.width > this.height) {

                        scale = 1000 / this.width;

                    } else {

                        scale = 1000 / this.height;

                    }

                }

                cvs.width = this.width * scale;

                cvs.height = this.height * scale;     //计算等比缩小后图片宽高

                var ctx = cvs.getContext('2d');

                ctx.drawImage(this, 0, 0, cvs.width, cvs.height);

                var newImageData = cvs.toDataURL(fileType, 0.8);   //重新生成图片，<span style="font-family: Arial, Helvetica, sans-serif;">fileType为用户选择的图片类型</span>

                var sendData = newImageData.replace("data:" + fileType + ";base64,", '');

                $.post('${base}/file/upload/sendImg.do', {imgCode: sendData}, function (data) {

                    if (data != '') {

                        $('.modify_img').attr('src', newImageData);

                        $("#appHiddenMain").val(data);

                        $("#imgd1").attr("src",data);

                        layer.closeAll();

                    } else {

                        layer.closeAll();

                        layer.open({

                            content: '上传失败'

                            , skin: 'msg'

                        });

                    }

                });

            }

        }

    } else {

        layer.open({

            content: '请选择图片格式文件'

            , skin: 'msg'

        });

    }

});

</script>

package com.aaa.qiniu;

import java.io.ByteArrayInputStream;

import java.io.IOException;

import com.qiniu.common.QiniuException;

import com.qiniu.common.Zone;

import com.qiniu.http.Response;

import com.qiniu.storage.Configuration;

import com.qiniu.storage.UploadManager;

import com.qiniu.util.Auth;

import com.aaa.utils.UUIDGenerator;

import sun.misc.BASE64Decoder;

public class CoverUpload {

    // 上传到七牛后保存的文件名

    //String key = "gagaTest.json";

    // 上传文件的路径

    //String filePath = "D:\\gagaTest.json";

    // 密钥配置

    private static Auth auth = Auth.create(QiniuConfig.ACCESS_KEY, QiniuConfig.SECRET_KEY);

    // 创建上传对象

    private static UploadManager uploadManager = new UploadManager(new Configuration(Zone.zone0()));

    // 覆盖上传

    private static String getUpToken(String key) {

        // <bucket>:<key>，表示只允许用户上传指定key的文件。在这种格式下文件默认允许“修改”，已存在同名资源则会被本次覆盖。

        // 如果希望只能上传指定key的文件，并且不允许修改，那么可以将下面的 insertOnly 属性值设为 1。

        // 第三个参数是token的过期时间

        return auth.uploadToken(QiniuConfig.bucketname, key/*, 3600, new StringMap().put("insertOnly", 1)*/);

    }

    public static boolean upload(String filePath, String key) throws IOException {

        try {

            // 调用put方法上传，这里指定的key和上传策略中的key要一致

            Response res = uploadManager.put(filePath, key, getUpToken(key));

            // 打印返回的信息

            System.out.println(res.bodyString());

        } catch (QiniuException e) {

            Response r = e.response;

            // 请求失败时打印的异常的信息

            System.out.println(r.toString());

            try {

                // 响应的文本信息

                System.out.println(r.bodyString());

            } catch (QiniuException e1) {

                // ignore

            }

            return false;

        }

        return true;

    }

    //采用的html5 压缩 传输base64方式

    public static boolean uploadHtml5(String imgStr,String key)

    {

        BASE64Decoder decoder = new BASE64Decoder();

        try {

            //Base64解码

            byte[] b = decoder.decodeBuffer(imgStr);

            for (int i = 0; i < b.length; ++i) {

                if (b[i] < 0) {//调整异常数据

                    b[i] += 256;

                }

            }

            ByteArrayInputStream byteInputStream = new ByteArrayInputStream(b);

            // 调用put方法上传，这里指定的key和上传策略中的key要一致

            Response response = uploadManager.put(byteInputStream, key, getUpToken(key), null, null);

            // 打印返回的信息

            System.out.println(response.bodyString());

        } catch (Exception e) {

            e.printStackTrace();

            // 请求失败时打印的异常的信息

            System.out.println(imgStr);

            return false;

        }

        return true;

    }

//    public static void main(String args[]) throws IOException {

//        new CoverUpload().upload("C:\\Users\\Administrator\\Desktop\\ip2222222.jpg","tianwenhui111333.jpg");

//    }

}