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！

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