spring boot 以请求来调用Ollama大模型，不使用spring ai

　　之前有一版使用spring ai的，但是其实Ollama有一套api可以直接调用。api地址是https://github.com/ollama/ollama/blob/main/docs/api.md

　　我们聊天其实调用的就是这个（其余的我就不赘述了，大家自行研究）

　　　　调用http请求这方面，大家可自行编写，请求的方式五花八门，网上的库和组件都比较完善了。我就简单的分享一个本人的。

　　　1、引用配置 （yam文件不变）

        <dependency><groupId>com.squareup.okhttp3</groupId><artifactId>okhttp</artifactId><version>4.12.0</version></dependency><dependency><groupId>org.json</groupId><artifactId>json</artifactId><version>20240303</version></dependency>

　　　2、编写实体类

import lombok.Data;@Data
public class Message {private String content;private String role;
}

　　role偷懒没做枚举类，ollama有4种，大家自己查阅。我这就是简单的主体。

import lombok.Data;
import java.util.List;@Data
public class ChatRequestParam {private String model;private Boolean Stream;private List<Message> messages;
}

　　3、http请求类

import okhttp3.CookieJar;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.MediaType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.io.IOException;
import java.util.concurrent.TimeUnit;public class HttpClient {private final Logger logger = LoggerFactory.getLogger(HttpClient.class);private OkHttpClient createClient() {return new OkHttpClient().newBuilder().callTimeout(1, TimeUnit.MINUTES).cookieJar(CookieJar.NO_COOKIES).build();}public String post(String url, String json) {OkHttpClient client = createClient();Request request = new Request.Builder().url(url).post(RequestBody.create(json, MediaType.get("application/json"))).build();Call call = client.newCall(request);logger.info("开始请求了");try {Response response = call.execute();String result = response.body().string();logger.info("请求结束，请求结果：{}", result);return result;} catch (Exception e) {logger.error("sorry,异常了：{}", e.getMessage());throw new RuntimeException(e);}}public Response get(String url, String json) throws IOException {OkHttpClient client = createClient();Request request = new Request.Builder().url(url).get().build();request.newBuilder().setBody$okhttp(RequestBody.create(json, MediaType.get("application/json")));Call call = client.newCall(request);return call.execute();}
}

　　4、请求类

@RestController
public class AnotherChatController {@Value("${spring.ai.ollama.base-url}")private String url;@Value("${spring.ai.ollama.chat.options.model}")private String model;private static final String chatApi = "/api/chat";@GetMapping("/ai/chat")public String chat(@RequestParam(value = "message", defaultValue = "Tell me a joke") String message) throws IOException {HttpClient httpClient = new HttpClient();String response = httpClient.post(url + chatApi, buildMainContent(message));return response;}private String buildMainContent (String msg) {ChatRequestParam chatRequestParam = new ChatRequestParam();chatRequestParam.setModel(model);chatRequestParam.setStream(false);Message target = new Message();target.setContent(msg);target.setRole("user");chatRequestParam.setMessages(List.of(target));return new JSONObject(chatRequestParam).toString();}
}

　　注意，结果里面的response.body().string() 只能调用一次，调用完就销毁了，所以我们得存起来，不能反复引用。至此，完毕！