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【郑州校区】传智健康项目讲义第四章 三
1.2.5 鉴权
Java SDK的所有的功能，都需要合法的授权。授权凭证的签算需要七牛账号下的一对有效的Access Key和Secret Key，这对密钥可以在七牛云管理控制台的个人中心（https://portal.qiniu.com/user/key）获得，如下图：
1.2.6 Java SDK
操作七牛云
本章节我们就需要使用七牛云提供的Java SDK完成图片上传和删除，我们可以参考官方提供的例子。
[AppleScript] 纯文本查看 复制代码 //构造一个带指定Zone对象的配置类
Configuration cfg = new Configuration(Zone.zone0());
//...其他参数参考类注释
UploadManager uploadManager = new UploadManager(cfg);
//...生成上传凭证，然后准备上传
String accessKey = "your access key";
String secretKey = "your secret key";
String bucket = "your bucket name";
//如果是Windows情况下，格式是 D:\\qiniu\\test.png
String localFilePath = "/home/qiniu/test.png";
//默认不指定key的情况下，以文件内容的hash值作为文件名
String key = null;
Auth auth = Auth.create(accessKey, secretKey);
String upToken = auth.uploadToken(bucket);
try {
Response response = uploadManager.put(localFilePath, key, upToken);
//解析上传成功的结果
DefaultPutRet putRet = new Gson().fromJson(response.bodyString(),
DefaultPutRet.class);
System.out.println(putRet.key);
System.out.println(putRet.hash);
} catch (QiniuException ex) {
Response r = ex.response;
System.err.println(r.toString());
try {
System.err.println(r.bodyString());
} catch (QiniuException ex2) {
//ignore
}
}
[AppleScript] 纯文本查看 复制代码 //构造一个带指定Zone对象的配置类
Configuration cfg = new Configuration(Zone.zone0());
//...其他参数参考类注释
String accessKey = "your access key";
String secretKey = "your secret key";
String bucket = "your bucket name";
String key = "your file key";
Auth auth = Auth.create(accessKey, secretKey);
BucketManager bucketManager = new BucketManager(auth, cfg);
try {
bucketManager.delete(bucket, key);
} catch (QiniuException ex) {
//如果遇到异常，说明删除失败
System.err.println(ex.code());
System.err.println(ex.response.toString());
}
1.2.7 封装工具类
为了方便操作七牛云存储服务，我们可以将官方提供的案例简单改造成一个工具类，在我们的项目中直接使用此工具类来操作就可以：
[AppleScript] 纯文本查看 复制代码 package com.itheima.utils;
import com.google.gson.Gson;
import com.qiniu.common.QiniuException;
import com.qiniu.common.Zone;
import com.qiniu.http.Response;
import com.qiniu.storage.BucketManager;
import com.qiniu.storage.Configuration;
import com.qiniu.storage.UploadManager;
import com.qiniu.storage.model.DefaultPutRet;
import com.qiniu.util.Auth;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
/**
* 七牛云工具类
*/
public class QiniuUtils {
public static String accessKey =
"dulF9Wze9bxujtuRvu3yyYb9JX1Sp23jzd3tO708";
public static String secretKey =
"vZkhW7iot3uWwcWz9vXfbaP4JepdWADFDHVLMZOe";
public static String bucket = "qiniutest";
public static void upload2Qiniu(String filePath,String fileName){
//构造一个带指定Zone对象的配置类
Configuration cfg = new Configuration(Zone.zone0());
UploadManager uploadManager = new UploadManager(cfg);
Auth auth = Auth.create(accessKey, secretKey);
String upToken = auth.uploadToken(bucket);
try {
Response response = uploadManager.put(filePath, fileName,
upToken);
//解析上传成功的结果
DefaultPutRet putRet =
new Gson().fromJson(response.bodyString(),
DefaultPutRet.class);
} catch (QiniuException ex) {
Response r = ex.response;try {
System.err.println(r.bodyString());
} catch (QiniuException ex2) {
//ignore
}
}
}
//上传文件
public static void upload2Qiniu(byte[] bytes, String fileName){
//构造一个带指定Zone对象的配置类
Configuration cfg = new Configuration(Zone.zone0());
//...其他参数参考类注释
UploadManager uploadManager = new UploadManager(cfg);
//默认不指定key的情况下，以文件内容的hash值作为文件名
String key = fileName;
Auth auth = Auth.create(accessKey, secretKey);
String upToken = auth.uploadToken(bucket);
try {
Response response = uploadManager.put(bytes, key, upToken);
//解析上传成功的结果
DefaultPutRet putRet =
new Gson().fromJson(response.bodyString(),
DefaultPutRet.class);
System.out.println(putRet.key);
System.out.println(putRet.hash);
} catch (QiniuException ex) {
Response r = ex.response;
System.err.println(r.toString());
try {
System.err.println(r.bodyString());
} catch (QiniuException ex2) {
//ignore
}
}
}
//删除文件
public static void deleteFileFromQiniu(String fileName){
//构造一个带指定Zone对象的配置类
Configuration cfg = new Configuration(Zone.zone0());String key = fileName;
Auth auth = Auth.create(accessKey, secretKey);
BucketManager bucketManager = new BucketManager(auth, cfg);
try {
bucketManager.delete(bucket, key);
} catch (QiniuException ex) {
//如果遇到异常，说明删除失败
System.err.println(ex.code());
System.err.println(ex.response.toString());
}
}
}
将此工具类放在health_common工程中，后续会使用到。
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