七牛云鉴黄实现

项目中把大部分的图片放在第三方存储–七牛云。今天要解决一个鉴黄的功能。
流程是如下图：

怎么鉴黄？看七牛云的文档：https://portal.qiniu.com/dora/thirdparty/create/image_porn/quickstart
1.在控制台首页右边的下方的众多第三方鉴黄选择一个，这里以网易易盾为例。

2.选择后点击“开始使用”，账户要充几块钱才能使用。

3.写代码实现
原理很简单，在图片url后面加上”?image_porn”访问七牛云，根据返回的数据判断是否合法。这里才用HttpClient4.5.2实现
<1>引进相应的jar包

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->   <dependency>    <groupId>org.apache.httpcomponents</groupId>    <artifactId>httpclient</artifactId>    <version>4.5.2</version>   </dependency>

<2>编写一个httpclient 工具类，在apache官网copy的，直接用

package com.xforce.pano.util;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import org.apache.http.HttpEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public class HttpClientHelper {    public boolean checkUpload (String url) throws Exception {        Boolean yellow = true;        CloseableHttpClient httpclient = HttpClients.createDefault();        try {            HttpGet httpGet = new HttpGet(url);            CloseableHttpResponse response = httpclient.execute(httpGet);            // The underlying HTTP connection is still held by the response object            // to allow the response content to be streamed directly from the network socket.            // In order to ensure correct deallocation of system resources            // the user MUST call CloseableHttpResponse#close() from a finally clause.            // Please note that if response content is not fully consumed the underlying            // connection cannot be safely re-used and will be shut down and discarded            // by the connection manager.            try {                HttpEntity entity = response.getEntity();                // do something useful with the response body                // and ensure it is fully consumed                //用io流接收返回的内容，再将io流转为string再转为json对象解析                InputStream ins = entity.getContent();                //解析具体过程看第三方接口返回的数据而定                JSONObject json = JSONObject.fromObject(StreamToString(ins));                JSONArray resultArray = JSONArray.fromObject(json.get("result"));                JSONObject resultObject = JSONObject.fromObject(resultArray.get(0));                JSONArray labelsArray = JSONArray.fromObject(resultObject.get("labels"));                //根据第三方提供的接口，labels为空说明图片是合法的，否则不合法                if(labelsArray.size() > 0) {                    yellow = false;                }                EntityUtils.consume(entity);            } finally {                response.close();            }        } finally {            httpclient.close();        }        return yellow;    }    //io流转string    private String StreamToString(InputStream is) {        BufferedReader reader = new BufferedReader(new InputStreamReader(is), 16*1024);         StringBuilder sb = new StringBuilder();        String line = null;        try {            while ((line = reader.readLine()) != null) {                sb.append(line + "\n");              }        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                is.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return sb.toString();    }}

<3>具体的应用在controller里面

...   try {            if(!(httpClientHelper.checkUpload(url + "?image_porn"))) {                ...            }        } catch (Exception e) {            e.printStackTrace();        }...

最后就愉快的测试吧，找些不合法的资源测试鉴黄效果！