java调用百度自然语言处理API参考（仿某宝评论观点抽取）

下面代码也许有助你使用百度自然语言处理API功能，自己理解吧，哦，说一下，工具类非本人原创，仅仅供示例代码使用。

baidu API有10多个接口，下面仅仅演示评论观点抽取，其他方法一样，只是参数不一样。

工具类：

package com.baidu.ai.aip.utils;

/**
 * Base64 工具类
 */
public class Base64Util {
    private static final char last2byte = (char) Integer.parseInt("00000011", 2);
    private static final char last4byte = (char) Integer.parseInt("00001111", 2);
    private static final char last6byte = (char) Integer.parseInt("00111111", 2);
    private static final char lead6byte = (char) Integer.parseInt("11111100", 2);
    private static final char lead4byte = (char) Integer.parseInt("11110000", 2);
    private static final char lead2byte = (char) Integer.parseInt("11000000", 2);
    private static final char[] encodeTable = new char[]{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};

    public Base64Util() {
    }

    public static String encode(byte[] from) {
        StringBuilder to = new StringBuilder((int) ((double) from.length * 1.34D) + 3);
        int num = 0;
        char currentByte = 0;

        int i;
        for (i = 0; i < from.length; ++i) {
            for (num %= 8; num < 8; num += 6) {
                switch (num) {
                    case 0:
                        currentByte = (char) (from[i] & lead6byte);
                        currentByte = (char) (currentByte >>> 2);
                    case 1:
                    case 3:
                    case 5:
                    default:
                        break;
                    case 2:
                        currentByte = (char) (from[i] & last6byte);
                        break;
                    case 4:
                        currentByte = (char) (from[i] & last4byte);
                        currentByte = (char) (currentByte << 2);
                        if (i + 1 < from.length) {
                            currentByte = (char) (currentByte | (from[i + 1] & lead2byte) >>> 6);
                        }
                        break;
                    case 6:
                        currentByte = (char) (from[i] & last2byte);
                        currentByte = (char) (currentByte << 4);
                        if (i + 1 < from.length) {
                            currentByte = (char) (currentByte | (from[i + 1] & lead4byte) >>> 4);
                        }
                }

                to.append(encodeTable[currentByte]);
            }
        }

        if (to.length() % 4 != 0) {
            for (i = 4 - to.length() % 4; i > 0; --i) {
                to.append("=");
            }
        }

        return to.toString();
    }
}

package com.baidu.ai.aip.utils;

import java.io.*;

/**
 * 文件读取工具类
 */
public class FileUtil {

    /**
     * 读取文件内容，作为字符串返回
     */
    public static String readFileAsString(String filePath) throws IOException {
        File file = new File(filePath);
        if (!file.exists()) {
            throw new FileNotFoundException(filePath);
        } 

        if (file.length() > 1024 * 1024 * 1024) {
            throw new IOException("File is too large");
        } 

        StringBuilder sb = new StringBuilder((int) (file.length()));
        // 创建字节输入流  
        FileInputStream fis = new FileInputStream(filePath);  
        // 创建一个长度为10240的Buffer
        byte[] bbuf = new byte[10240];  
        // 用于保存实际读取的字节数  
        int hasRead = 0;  
        while ( (hasRead = fis.read(bbuf)) > 0 ) {  
            sb.append(new String(bbuf, 0, hasRead));  
        }  
        fis.close();  
        return sb.toString();
    }

    /**
     * 根据文件路径读取byte[] 数组
     */
    public static byte[] readFileByBytes(String filePath) throws IOException {
        File file = new File(filePath);
        if (!file.exists()) {
            throw new FileNotFoundException(filePath);
        } else {
            ByteArrayOutputStream bos = new ByteArrayOutputStream((int) file.length());
            BufferedInputStream in = null;

            try {
                in = new BufferedInputStream(new FileInputStream(file));
                short bufSize = 1024;
                byte[] buffer = new byte[bufSize];
                int len1;
                while (-1 != (len1 = in.read(buffer, 0, bufSize))) {
                    bos.write(buffer, 0, len1);
                }

                byte[] var7 = bos.toByteArray();
                return var7;
            } finally {
                try {
                    if (in != null) {
                        in.close();
                    }
                } catch (IOException var14) {
                    var14.printStackTrace();
                }

                bos.close();
            }
        }
    }
}

/*
 * Copyright (C) 2017 Baidu, Inc. All Rights Reserved.
 */
package com.baidu.ai.aip.utils;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParseException;

import java.lang.reflect.Type;

/**
 * Json工具类.
 */
public class GsonUtils {
    private static Gson gson = new GsonBuilder().create();

    public static String toJson(Object value) {
        return gson.toJson(value);
    }

    public static  T fromJson(String json, Class classOfT) throws JsonParseException {
        return gson.fromJson(json, classOfT);
    }

    public static  T fromJson(String json, Type typeOfT) throws JsonParseException {
        return (T) gson.fromJson(json, typeOfT);
    }
}

package com.baidu.ai.aip.utils;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/**
 * http 工具类
 */
public class HttpUtil {

    public static String post(String requestUrl, String accessToken, String params)
            throws Exception {
        String contentType = "application/x-www-form-urlencoded";
        return HttpUtil.post(requestUrl, accessToken, contentType, params);
    }

    public static String post(String requestUrl, String accessToken, String contentType, String params)
            throws Exception {
        String encoding = "UTF-8";
        if (requestUrl.contains("nlp")) {
            encoding = "GBK";
        }
        return HttpUtil.post(requestUrl, accessToken, contentType, params, encoding);
    }

    public static String post(String requestUrl, String accessToken, String contentType, String params, String encoding)
            throws Exception {
        String url = requestUrl + "?access_token=" + accessToken;
        return HttpUtil.postGeneralUrl(url, contentType, params, encoding);
    }

    public static String postGeneralUrl(String generalUrl, String contentType, String params, String encoding)
            throws Exception {
        URL url = new URL(generalUrl);
        // 打开和URL之间的连接
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        // 设置通用的请求属性
        connection.setRequestProperty("Content-Type", contentType);
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setUseCaches(false);
        connection.setDoOutput(true);
        connection.setDoInput(true);

        // 得到请求的输出流对象
        DataOutputStream out = new DataOutputStream(connection.getOutputStream());
        out.write(params.getBytes(encoding));
        out.flush();
        out.close();

        // 建立实际的连接
        connection.connect();
        // 获取所有响应头字段
        Map> headers = connection.getHeaderFields();
        // 遍历所有的响应头字段
        for (String key : headers.keySet()) {
            System.err.println(key + "--->" + headers.get(key));
        }
        // 定义 BufferedReader输入流来读取URL的响应
        BufferedReader in = null;
        in = new BufferedReader(
                new InputStreamReader(connection.getInputStream(), encoding));
        String result = "";
        String getLine;
        while ((getLine = in.readLine()) != null) {
            result += getLine;
        }
        in.close();
        System.err.println("result:" + result);
        return result;
    }
}

package test;

import java.io.BufferedReader;  
import java.io.IOException;
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;  
import java.net.HttpURLConnection;  
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL; 
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

/** 
 * Http请求工具类 
 * @author snowfigure 
 * @since 2014-8-24 13:30:56 
 * @version v1.0.1 
 */ 
public class HttpRequestUtil {
    static boolean proxySet = false;
    static String proxyHost = "127.0.0.1";
    static int proxyPort = 8087;
    /** 
     * 编码 
     * @param source 
     * @return 
     */  
    public static String urlEncode(String source,String encode) {  
        String result = source;  
        try {  
            result = java.net.URLEncoder.encode(source,encode);  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
            return "0";  
        }  
        return result;  
    }
    public static String urlEncodeGBK(String source) {  
        String result = source;  
        try {  
            result = java.net.URLEncoder.encode(source,"GBK");  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
            return "0";  
        }  
        return result;  
    }
    /** 
     * 发起http请求获取返回结果 
     * @param req_url 请求地址 
     * @return 
     */  
    public static String httpRequest(String req_url) {
        StringBuffer buffer = new StringBuffer();  
        try {  
            URL url = new URL(req_url);  
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();  

            httpUrlConn.setDoOutput(false);  
            httpUrlConn.setDoInput(true);  
            httpUrlConn.setUseCaches(false);  

            httpUrlConn.setRequestMethod("GET");  
            httpUrlConn.connect();  

            // 将返回的输入流转换成字符串  
            InputStream inputStream = httpUrlConn.getInputStream();  
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");  
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);  

            String str = null;  
            while ((str = bufferedReader.readLine()) != null) {  
                buffer.append(str);  
            }  
            bufferedReader.close();  
            inputStreamReader.close();  
            // 释放资源  
            inputStream.close();  
            inputStream = null;  
            httpUrlConn.disconnect();  

        } catch (Exception e) {  
            System.out.println(e.getStackTrace());  
        }  
        return buffer.toString();  
    }  

    /** 
     * 发送http请求取得返回的输入流 
     * @param requestUrl 请求地址 
     * @return InputStream 
     */  
    public static InputStream httpRequestIO(String requestUrl) {  
        InputStream inputStream = null;  
        try {  
            URL url = new URL(requestUrl);  
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();  
            httpUrlConn.setDoInput(true);  
            httpUrlConn.setRequestMethod("GET");  
            httpUrlConn.connect();  
            // 获得返回的输入流  
            inputStream = httpUrlConn.getInputStream();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return inputStream;  
    }


    /**
     * 向指定URL发送GET方法的请求
     * 
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * 
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @param isproxy
     *               是否使用代理模式
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param,boolean isproxy) {
        OutputStreamWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn = null;
            if(isproxy){//使用代理模式
                @SuppressWarnings("static-access")
                Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
                conn = (HttpURLConnection) realUrl.openConnection(proxy);
            }else{
                conn = (HttpURLConnection) realUrl.openConnection();
            }
            // 打开和URL之间的连接

            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setRequestMethod("POST");    // POST方法


            // 设置通用的请求属性

            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            conn.connect();

            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            // 发送请求参数
            out.write(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    

    public static void main(String[] args) {
        //demo:代理访问
        String url = "http://api.adf.ly/api.php";
        String para = "key=youkeyid&youuid=uid&advert_type=int&domain=adf.ly&url=http://somewebsite.com";

        String sr=HttpRequestUtil.sendPost(url,para,true);
        System.out.println(sr);
    }

}

package test;



import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;



/**
 * 获取token类
 */
public class AuthService {

    /**
     * 获取权限token
     * @return 返回示例：
     * {
     * "access_token": "luozhuang",
     * "expires_in": 2592000
     * }
     */
    public static String getAuth() {
    	//java.security.Security.setProperty("ssl.SocketFactory.provider", "sun.security.ssl.SSLSocketFactoryImpl");
    	//java.security.Security.setProperty("ssl.ServerSocketFactory.provider", "sun.security.ssl.SSLSocketFactoryImpl");
        // 官网获取的 API Key 更新为你注册的
        String clientId = "luozhuang";
        // 官网获取的 Secret Key 更新为你注册的
        String clientSecret = "luozhuang";
        return getAuth(clientId, clientSecret);
    }

    /**
     * 获取API访问token
     * 该token有一定的有效期，需要自行管理，当失效时需重新获取.
     * @param ak - 百度云官网获取的 API Key
     * @param sk - 百度云官网获取的 Securet Key
     * @return assess_token 示例：
     * "luozhuang"
     */
    public static String getAuth(String ak, String sk) {
        // 获取token地址
    	 String access_token = null;
        String authHost = "https://aip.baidubce.com/oauth/2.0/token?";
        String getAccessTokenUrl = authHost
                // 1. grant_type为固定参数
                + "grant_type=client_credentials"
                // 2. 官网获取的 API Key
                + "&client_id=" + ak
                // 3. 官网获取的 Secret Key
                + "&client_secret=" + sk;
        try {
            URL realUrl = new URL(getAccessTokenUrl);
            // 打开和URL之间的连接
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            // 获取所有响应头字段
            Map> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.err.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String result = "";
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            /**
             * 返回结果示例
             */
            System.err.println("result:" + result);
            JSONObject jsonObject = new JSONObject(result);
             access_token = jsonObject.getString("access_token");
            return access_token;
        } catch (Exception e) {
            System.err.printf("获取token失败！");
            e.printStackTrace(System.err);
        }
        return access_token;
    }

        public static void main(String args[]) { 
        	AuthService temp=new AuthService();
        	temp.getAuth();
        } 
   
}

package test;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONObject;

import com.alibaba.fastjson.JSON;
import com.baidu.ai.aip.utils.GsonUtils;
import com.baidu.ai.aip.utils.HttpUtil;

public class recComment_TagClss {
	// #####调用鉴权接口获取的token#####
	public String access_token = "luozhuang";
	int getaccesstokentime;
	String comment_tag_Url = "https://aip.baidubce.com/rpc/2.0/nlp/v2/comment_tag";

	public String getaccess_token() {
		AuthService temp = new AuthService();
		access_token = temp.getAuth();
		return access_token;
	}

	public String comment_tag(String accessToken, String comment) {
		try {
			comment = URLDecoder.decode(comment, "utf-8");
		} catch (UnsupportedEncodingException e1) {

			e1.printStackTrace();
		}
		String result = null;
		// 评论观点抽取url
		if (comment == null) {
			return result;
		}

		try {
			Map map = new HashMap();
			// comment = URLEncoder.encode(comment, "GBK");
			map.put("text", comment); // 评论内容
			map.put("type", 13); // 类别
			String params = GsonUtils.toJson(map);

			/**
			 * 线上环境access_token有过期时间， 客户端可自行缓存，过期后重新获取。
			 */

			result = HttpUtil.post(comment_tag_Url, accessToken, params);

			System.out.println(result);
			JSONObject jsonObject = new JSONObject(result);
			if (jsonObject.has("error_code") == true) {
				int error=jsonObject.getInt("error_code");
				if("282130".equals(String.valueOf(error)))
				{ 
				return "282130 没有识别到数据";
				}
				else
				{
				return "错误:" + jsonObject.getString("error_msg");
				}
			}
			if (jsonObject.has("items") == true) {

				JSONArray item = jsonObject.getJSONArray("items");
				result = "";
				if (item == null) {
					return result;
				}

				for (int i = 0; i < item.length(); i++) {
					jsonObject = item.getJSONObject(i);
					result = result + ";" + jsonObject.getString("abstract");
				}
			}

		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	public static void main(String args[]) {
		recComment_TagClss tempTagClss = new recComment_TagClss();
		/*
		 * AuthService temp=new AuthService(); String
		 * access_token=temp.getAuth();
		 */
		String comment = "个人觉得luozhuang好，外观漂亮年轻，动力和操控性都不错";
		tempTagClss.comment_tag(tempTagClss.getaccess_token(), comment);
	}
}