Java接入文心一言

末蓝、 2023-10-15 05:52 26阅读 0赞

#### 文章目录 ####

*  文心一言应用创建
 *  接口对接
 *   *  接口文档
     *  代码示例
     *   *  依赖
     *  常量类
     *   *  实体类
 *  结束语

## 文心一言应用创建 ##

首先需要先申请文心千帆大模型，申请地址：文心一言 (baidu.com)，点击加入体验，等通过审核之后就可以进入文心千帆大模型后台进行应用管理了。

在百度智能云首页即可看到文心千帆大模型平台

然后进入后台管理之后，点击应用接入，创建应用即可

创建完应应用之后，便可以调用文心一言的http开发接口进行交互了。

## 接口对接 ##

### 接口文档 ###

首先要看一下接口文档：API调用指南 - 文心千帆WENXINWORKSHOP | 百度智能云文档 (baidu.com)

这里我用的是ERNIE-Bot-turbo API，主要是由于它响应更快。

下面介绍一下具体接入的代码

### 代码示例 ###

#### 依赖 ####

依赖安装

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <artifactId>baidu</artifactId>
            <groupId>com.walter</groupId>
            <version>1.0</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <version>1.0</version>
        <artifactId>baidumodel</artifactId>
        <description>百度大模型</description>
    
        <repositories>
            <repository>
                <id>public</id>
                <name>aliyun nexus</name>
                <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
                <releases>
                    <enabled>true</enabled>
                </releases>
                <snapshots>
                    <enabled>false</enabled>
                </snapshots>
            </repository>
        </repositories>
    
        <dependencies>
    
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
    	    <version>2.11.1</version>
            </dependency>
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-http</artifactId>
                <version>5.8.11</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-json</artifactId>
                <version>5.8.11</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
    	    <version>1.18.12</version>
            </dependency>
            <dependency>
                <groupId>com.squareup.okhttp3</groupId>
                <artifactId>okhttp-sse</artifactId>
    	    <version>3.14.9</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
    	    <version>1.7.30</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.30</version>
            </dependency>
        </dependencies>
    </project>

### 常量类 ###

ApiConstant.java

@Slf4j
    public class ApiConstant {
        
    
        /**
         * ERNIE_BOT_TURBO 发起会话接口
         */
        public static final String ERNIE_BOT_TURBO_INSTANT = "https://aip.baidubce.com/rpc/2.0/ai_custom/v1/wenxinworkshop/chat/eb-instant?access_token=";
    
        public static String getToken(String appKey, String secretKey) {
        
            String url = "https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=" + appKey + "&client_secret=" + secretKey;
            String s = HttpUtil.get(url);
            Token bean = JSONUtil.toBean(s, Token.class);
            return bean.getAccess_token();
        }
    }

#### 实体类 ####

BaiduChatMessage.java

@Data
    @Builder
    @NoArgsConstructor
    @AllArgsConstructor
    public class BaiduChatMessage implements Serializable {
        
        private String role;
        private String content;
    }

ErnieBotTurboResponse.java

@Data
    public class ErnieBotTurboResponse implements Serializable {
        
        private String id;
        private String object;
        private Integer created;
    
        private String sentence_id;
        private Boolean is_end;
        private Boolean is_truncated;
        private String result;
        private Boolean need_clear_history;
    
        private Usage usage;
    
        @Data
        public static class Usage implements Serializable {
        
            private Integer prompt_tokens;
            private Integer completion_tokens;
            private Integer total_tokens;
    
        }
    }

ErnieBotTurboStreamParam.java

@Data
    @Builder
    @NoArgsConstructor
    @AllArgsConstructor
    public class ErnieBotTurboStreamParam implements Serializable {
        
    
        private List<BaiduChatMessage> messages;
        private Boolean stream;
        private String user_id;
    
        public boolean isStream() {
        
            return Objects.equals(this.stream, true);
        }
    }

Token.java

@Data
    public class Token implements Serializable {
        
        private String access_token;
        private Integer expires_in;
        private String error;
        private String error_description;
    }

BaiduEventSourceListener.java

// 这个类主要是为了与文心一言API建立流式连接，实现数据的实时返回，而不是等完整的数据生成之后才将数据返回
    // 可以减少用户等待时间，实现更好的交互体验
    @Slf4j
    public class BaiduEventSourceListener extends EventSourceListener {
        
    
        @Override
        public void onOpen(EventSource eventSource, Response response) {
        
            log.info("baidu建立sse连接...");
        }
    
        @Override
        public void onEvent(EventSource eventSource, String id, String type, String data) {
        
            log.info("baidu返回数据：{}", data);
        }
    
        @Override
        public void onClosed(EventSource eventSource) {
        
            log.info("baidu关闭sse连接...");
        }
    
        @SneakyThrows
        @Override
        public void onFailure(EventSource eventSource, Throwable t, Response response) {
        
            if(Objects.isNull(response)){
        
                log.error("baidu  sse连接异常:{}", t);
                eventSource.cancel();
                return;
            }
            ResponseBody body = response.body();
            if (Objects.nonNull(body)) {
        
                log.error("baidu  sse连接异常data：{}，异常：{}", body.string(), t);
            } else {
        
                log.error("baidu  sse连接异常data：{}，异常：{}", response, t);
            }
            eventSource.cancel();
        }
    }

BaiduService.java

// 该类主要是处理接口请求，处理接口响应逻辑
    @Slf4j
    @Data
    public class BaiduService {
        
    
        private static final long TIME_OUT = 30;
    
        private OkHttpClient okHttpClient;
        private String appKey;
        private String secretKey;
    
        public BaiduService(@NonNull String appKey, @NonNull String secretKey) {
        
            this.appKey = appKey;
            this.secretKey = secretKey;
            this.okHttpClient(30, 30, 30, null);
        }
    
        public BaiduService(@NonNull String appKey, @NonNull String secretKey, long connectTimeout, long writeTimeout, long readTimeout, Proxy proxy) {
        
            this.appKey = appKey;
            this.secretKey = secretKey;
            this.okHttpClient(connectTimeout, writeTimeout, readTimeout, proxy);
        }
    
    
        private void okHttpClient(long connectTimeout, long writeTimeout, long readTimeout, Proxy proxy) {
        
            OkHttpClient.Builder client = new OkHttpClient.Builder();
            client.connectTimeout(connectTimeout, TimeUnit.SECONDS);
            client.writeTimeout(writeTimeout, TimeUnit.SECONDS);
            client.readTimeout(readTimeout, TimeUnit.SECONDS);
            if (Objects.nonNull(proxy)) {
        
                client.proxy(proxy);
            }
            this.okHttpClient = client.build();
        }
    
        // 该方法是同步请求API，会等大模型将数据完全生成之后，返回响应结果，可能需要等待较长时间，视生成文本长度而定
        public ErnieBotTurboResponse ernieBotTurbo(ErnieBotTurboStreamParam param) {
        
            if (param == null) {
        
                log.error("参数异常：param不能为空");
                throw new RuntimeException("参数异常：param不能为空");
            }
            if (param.isStream()) {
        
                param.setStream(false);
            }
            String post = HttpUtil.post(ApiConstant.ERNIE_BOT_TURBO_INSTANT + ApiConstant.getToken(appKey, secretKey), JSONUtil.toJsonStr(param));
            return JSONUtil.toBean(post, ErnieBotTurboResponse.class);
        }
    
        // 该方法是通过流的方式请求API，大模型每生成一些字符，就会通过流的方式相应给客户端，
        // 我们是在 BaiduEventSourceListener.java 的 onEvent 方法中获取大模型响应的数据，其中data就是具体的数据，
        // 我们获取到数据之后，就可以通过 SSE/webscocket 的方式实时相应给前端页面展示
        public void ernieBotTurboStream(ErnieBotTurboStreamParam param, EventSourceListener eventSourceListener) {
        
            if (Objects.isNull(eventSourceListener)) {
        
                log.error("参数异常：EventSourceListener不能为空");
                throw new RuntimeException("参数异常：EventSourceListener不能为空");
            }
            if (param == null) {
        
                log.error("参数异常：param不能为空");
                throw new RuntimeException("参数异常：param不能为空");
            }
            if (!param.isStream()) {
        
                param.setStream(true);
            }
            try {
        
                EventSource.Factory factory = EventSources.createFactory(this.okHttpClient);
                ObjectMapper mapper = new ObjectMapper();
                String requestBody = mapper.writeValueAsString(param);
                Request request = new Request.Builder()
                        .url(ApiConstant.ERNIE_BOT_TURBO_INSTANT + ApiConstant.getToken(appKey, secretKey))
                        .post(RequestBody.create(MediaType.parse(ContentType.JSON.getValue()), requestBody))
                        .build();
                //创建事件
                EventSource eventSource = factory.newEventSource(request, eventSourceListener);
            } catch (JsonProcessingException e) {
        
                log.error("请求参数解析是失败！", e);
                throw new RuntimeException("请求参数解析是失败！", e);
            }
    
        }
    }

## 结束语 ##

以上就是通过文心一言的OpenAPI与大模型交互的整体逻辑，等代码功能再做完善之后，改代码会以SDK的方式开源到Gitee，欢迎一起探讨。