准备工作：

1. 注册一个七牛账号，注册链接：点击注册 ，注册成功之后最好实名认证一下，每个月的流量以及空间的容量会增加很多。
2. 新建一个空间，记下空间名称（bucketName）。在账号里找到密钥：AK，SK。后面开发中会用到这些。
3. 下载七牛jar文件。

七牛工具类：

package com.yida.framework.base.util.qiniu;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import org.apache.commons.io.IOUtils;import com.qiniu.common.QiniuException;import com.qiniu.http.Response;import com.qiniu.storage.BucketManager;import com.qiniu.storage.UploadManager;import com.qiniu.storage.model.DefaultPutRet;import com.qiniu.storage.model.FileInfo;import com.qiniu.storage.model.FileListing;import com.qiniu.util.Auth;/** * @ClassName: QiniuUtils * @Description: 七牛操作工具类 * @author Lanxiaowei(736031305@qq.com) * @date 2015年12月8日 上午10:56:32 *  */public class QiniuUtils {private static final String ACCESS_KEY = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";private static final String SECRET_KEY = "*******************************";/**默认上传空间*/private static final String BUCKET_NAME = "XXXXXXXXXXXXXXX";/**空间默认域名*/private static final String BUCKET_HOST_NAME = "http://xxxxxxxxxxxxxxxx.clouddn.com";private static UploadManager uploadManager = new UploadManager();private static int LIMIT_SIZE = 1000;/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: listBucket * @Description: 返回七牛帐号的所有空间 * @param @return * @param @throws QiniuException * @return String[] * @throws */public static String[] listBucket() throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);return bucketManager.buckets();}/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: listFileOfBucket * @Description: 获取指定空间下的文件列表 * @param bucketName  空间名称 * @param prefix      文件名前缀 * @param limit       每次迭代的长度限制，最大1000，推荐值 100[即一个批次从七牛拉多少条] * @param @return * @return List
    
      * @throws */public static List
     
       listFileOfBucket(String bucketName,String prefix,int limit) {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);BucketManager.FileListIterator it = bucketManager.createFileListIterator(bucketName, prefix, limit, null);List
      
        list = new ArrayList
       
        ();while (it.hasNext()) {    FileInfo[] items = it.next();    if (null != items && items.length > 0) {        list.addAll(Arrays.asList(items));    }}return list;}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: uploadFile * @Description: 七牛图片上传 * @param @param inputStream    待上传文件输入流 * @param @param bucketName     空间名称 * @param @param key            空间内文件的key * @param @param mimeType       文件的MIME类型，可选参数，不传入会自动判断 * @param @return * @param @throws IOException * @return String * @throws */public static String uploadFile(InputStream inputStream,String bucketName,String key,String mimeType) throws IOException {  Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);    String token = auth.uploadToken(bucketName);    byte[] byteData = IOUtils.toByteArray(inputStream);    Response response = uploadManager.put(byteData, key, token, null, mimeType, false);    inputStream.close();    return response.bodyString();}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: uploadFile * @Description: 七牛图片上传 * @param @param inputStream    待上传文件输入流 * @param @param bucketName     空间名称 * @param @param key            空间内文件的key * @param @return * @param @throws IOException * @return String * @throws */public static String uploadFile(InputStream inputStream,String bucketName,String key) throws IOException {  Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);    String token = auth.uploadToken(bucketName);    byte[] byteData = IOUtils.toByteArray(inputStream);    Response response = uploadManager.put(byteData, key, token, null, null, false);    inputStream.close();    return response.bodyString();}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: uploadFile * @Description: 七牛图片上传 * @param filePath     待上传文件的硬盘路径 * @param fileName     待上传文件的文件名 * @param bucketName   空间名称 * @param key          空间内文件的key * @param @return * @param @throws IOException * @return String * @throws */public static String uploadFile(String filePath,String fileName,String bucketName,String key) throws IOException {      Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);    String token = auth.uploadToken(bucketName);    InputStream is = new FileInputStream(new File(filePath + fileName));    byte[] byteData = IOUtils.toByteArray(is);    Response response = uploadManager.put(byteData, (key == null || "".equals(key))? fileName : key, token);    is.close();    return response.bodyString();}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: uploadFile * @Description: 七牛图片上传[若没有指定文件的key,则默认将fileName参数作为文件的key] * @param filePath     待上传文件的硬盘路径 * @param fileName     待上传文件的文件名 * @param bucketName   空间名称 * @param @return * @param @throws IOException * @return String * @throws */public static String uploadFile(String filePath,String fileName,String bucketName) throws IOException {  Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);    String token = auth.uploadToken(bucketName);    InputStream is = new FileInputStream(new File(filePath + fileName));    byte[] byteData = IOUtils.toByteArray(is);    Response response = uploadManager.put(byteData, fileName, token);    is.close();    return response.bodyString();}----------/** * @throws QiniuException  * @Author: Lanxiaowei(736031305@qq.com) * @Title: fetchToBucket * @Description: 提取网络资源并上传到七牛空间里 * @param url           网络上一个资源文件的URL * @param bucketName    空间名称 * @param key           空间内文件的key[唯一的] * @param @return * @return String * @throws */public static String fetchToBucket(String url,String bucketName,String key) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);DefaultPutRet putret = bucketManager.fetch(url, bucketName, key);return putret.key;}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: fetchToBucket * @Description: 提取网络资源并上传到七牛空间里,不指定key，则默认使用url作为文件的key * @param url * @param bucketName * @param @return * @param @throws QiniuException * @return String * @throws */public static String fetchToBucket(String url,String bucketName) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);DefaultPutRet putret = bucketManager.fetch(url, bucketName);return putret.key;}----------/** * @throws QiniuException  * @Author: Lanxiaowei(736031305@qq.com) * @Title: copyFile * @Description: 七牛空间内文件复制 * @param bucket         源空间名称 * @param key            源空间里文件的key(唯一的) * @param targetBucket   目标空间 * @param targetKey      目标空间里文件的key(唯一的) * @return void * @throws */public static void copyFile(String bucket, String key, String targetBucket, String targetKey) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);bucketManager.copy(bucket, key, targetBucket, targetKey);}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: moveFile * @Description: 七牛空间内文件剪切 * @param bucket         源空间名称 * @param key            源空间里文件的key(唯一的) * @param targetBucket   目标空间 * @param targetKey      目标空间里文件的key(唯一的) * @param @throws QiniuException * @return void * @throws */public static void moveFile(String bucket, String key, String targetBucket, String targetKey) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);bucketManager.move(bucket, key, targetBucket, targetKey);}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: renameFile * @Description: 七牛空间内文件重命名 * @param bucket * @param key * @param targetKey * @param @throws QiniuException * @return void * @throws */public static void renameFile(String bucket, String key, String targetKey) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);bucketManager.rename(bucket, key, targetKey);}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: deleteFile * @Description: 七牛空间内文件删除 * @param bucket    空间名称 * @param key       空间内文件的key[唯一的] * @param @throws QiniuException * @return void * @throws */public static void deleteFile(String bucket, String key) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);bucketManager.delete(bucket, key);}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: findFiles * @Description: 返回指定空间下的所有文件信息 * @param @param bucketName   空间名称 * @param @param prefix       文件key的前缀 * @param @param limit        批量提取的最大数目 * @param @return * @param @throws QiniuException * @return FileInfo[] * @throws */public static FileInfo[] findFiles(String bucketName,String prefix,int limit) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);FileListing listing = bucketManager.listFiles(bucketName, prefix, null, limit, null);if(listing == null || listing.items == null || listing.items.length <= 0) {return null;}return listing.items;}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: findFiles * @Description: 返回指定空间下的所有文件信息 * @param @param bucketName   空间名称 * @param @param prefix       文件key的前缀 * @param @return * @param @throws QiniuException * @return FileInfo[] * @throws */public static FileInfo[] findFiles(String bucketName,String prefix) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);FileListing listing = bucketManager.listFiles(bucketName, prefix, null, LIMIT_SIZE, null);if(listing == null || listing.items == null || listing.items.length <= 0) {return null;}return listing.items;}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: findFiles * @Description: 返回指定空间下的所有文件信息 * @param @param bucketName * @param @param key * @param @return * @param @throws QiniuException * @return FileInfo[] * @throws */public static FileInfo[] findFiles(String bucketName) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);FileListing listing = bucketManager.listFiles(bucketName, null, null, LIMIT_SIZE, null);if(listing == null || listing.items == null || listing.items.length <= 0) {return null;}return listing.items;}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: findOneFile * @Description: 返回指定空间下的某个文件 * @param @param bucketName * @param @param key * @param @param limit * @param @return * @param @throws QiniuException * @return FileInfo * @throws */public static FileInfo findOneFile(String bucketName,String key,int limit) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);FileListing listing = bucketManager.listFiles(bucketName, key, null, limit, null);if(listing == null || listing.items == null || listing.items.length <= 0) {return null;}return (listing.items)[0];}----------/** * @Author: Lanxiaowei(736031305@qq.com) * @Title: findOneFile * @Description: 返回指定空间下的某个文件(重载) * @param @param bucketName * @param @param key * @param @return * @param @throws QiniuException * @return FileInfo * @throws */public static FileInfo findOneFile(String bucketName,String key) throws QiniuException {Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);BucketManager bucketManager = new BucketManager(auth);FileListing listing = bucketManager.listFiles(bucketName, key, null, LIMIT_SIZE, null);if(listing == null || listing.items == null || listing.items.length <= 0) {return null;}return (listing.items)[0];}----------       /** * @Author: Lanxiaowei(736031305@qq.com) * @Title: getFileAccessUrl * @Description: 返回七牛空间内指定文件的访问URL * @param @param key * @param @return * @param @throws QiniuException * @return String * @throws */public static String getFileAccessUrl(String key) throws QiniuException {return BUCKET_HOST_NAME + "/" + key;}public static void main(String[] args) throws IOException {//uploadFile("C:/test.jpg");/*String[] buckets = listBucket();for(String bucket : buckets) {System.out.println(bucket);}*//*List
        
          list = listFileOfBucket(BUCKET_NAME, null, 1000);for(FileInfo fileInfo : list) {System.out.println("key：" + fileInfo.key);System.out.println("hash：" + fileInfo.hash);System.out.println("................");}*///copyFile(BUCKET_NAME, "images-test", BUCKET_NAME, "images-test-1111");//renameFile(BUCKET_NAME, "images-test-1111", "images-test-2222.jpg");//deleteFile(BUCKET_NAME, "images-test-2222.jpg");//fetchToBucket("http://www.nanrenwo.net/uploads/allimg/121026/14-1210261JJD03.jpg", BUCKET_NAME,"1111111111111111.jpg");FileInfo[] fileInfos = findFiles(BUCKET_NAME, "10", LIMIT_SIZE);for(FileInfo fileInfo : fileInfos) {System.out.println(fileInfo.key);System.out.println(fileInfo.hash);System.out.println("..............");}}}