【LangChain4J】阿里云百炼-HelloWord

LangChain4J官网

https://docs.langchain4j.dev/

阿里云百炼官网

https://bailian.console.aliyun.com/

大模型调用三要素

• Apikey 百炼官网-模型服务-密钥管理中获取 ps:妥善保管
• 模型名 qwen-plus
• baseUrl https://dashscope.aliyuncs.com/compatible-mode/v1

idea中新建pom父工程

官网Pom教程

<?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">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.example</groupId>
  <artifactId>langchain4j-silentLion</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>pom</packaging>
  <modules>
    <module>langchain4j-01helloworld</module>
  </modules>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>17</java.version>
    <maven.compiler.source>17</maven.compiler.source>
    <maven.compiler.target>17</maven.compiler.target>

    <!-- Spring Boot -->
    <spring-boot.version>3.5.0</spring-boot.version>

    <!-- Spring AI -->
    <spring-ai.version>1.0.0</spring-ai.version>

    <!-- Spring AI Alibaba -->
    <spring-ai-alibaba.version>1.0.0-M6.1</spring-ai-alibaba.version>

    <!-- Langchain4j -->
    <langchain4j.version>1.5.0</langchain4j.version>

    <!-- Langchain4j-community 引入阿里云百炼平台依赖管理清单 -->
    <langchain4j-community.version>1.5.0-beta11</langchain4j-community.version>

    <!-- maven plugin -->
    <maven-deploy-plugin.version>3.1.1</maven-deploy-plugin.version>
    <flatten-maven-plugin.version>1.3.0</flatten-maven-plugin.version>
    <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
  </properties>
  <dependencyManagement>
    <dependencies>
      <!-- Spring Boot -->
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>${spring-boot.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <!-- Spring AI -->
      <dependency>
        <groupId>org.springframework.ai</groupId>
        <artifactId>spring-ai-bom</artifactId>
        <version>${spring-ai.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <!-- Spring AI Alibaba -->
      <dependency>
        <groupId>com.alibaba.cloud.ai</groupId>
        <artifactId>spring-ai-alibaba-starter</artifactId>
        <version>${spring-ai-alibaba.version}</version>
      </dependency>

      <!-- LangChain4j 的依赖清单，加载 BoM 后所有 langchain4j 版本号可以被统一管理 -->
      <!-- https://docs.langchain4j.dev/get-started -->
      <dependency>
        <groupId>dev.langchain4j</groupId>
        <artifactId>langchain4j-bom</artifactId>
        <version>${langchain4j.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <!-- 引入阿里云百炼平台依赖管理清单 -->
      <!-- https://docs.langchain4j.dev/integrations/language-models/dashscope -->
      <dependency>
        <groupId>dev.langchain4j</groupId>
        <artifactId>langchain4j-community-bom</artifactId>
        <version>${langchain4j-community.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <build>
    <plugins>
      <!-- Spring Boot 打包插件 -->
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <version>${spring-boot.version}</version>
      </plugin>

      <!-- Maven 部署插件（跳过） -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-deploy-plugin</artifactId>
        <version>${maven-deploy-plugin.version}</version>
        <configuration>
          <skip>true</skip>
        </configuration>
      </plugin>

      <!-- Maven 编译插件 -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>${maven-compiler-plugin.version}</version>
        <configuration>
          <release>${java.version}</release>
          <compilerArgs>
            <compilerArg>-parameters</compilerArg>
          </compilerArgs>
        </configuration>
      </plugin>

      <!-- Flatten 插件 -->
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>flatten-maven-plugin</artifactId>
        <version>${flatten-maven-plugin.version}</version>
        <inherited>true</inherited>
        <executions>
          <execution>
            <id>flatten</id>
            <phase>process-resources</phase>
            <goals>
              <goal>flatten</goal>
            </goals>
            <configuration>
              <updatePomFile>true</updatePomFile>
              <flattenMode>ossrh</flattenMode>
              <pomElements>
                <distributionManagement>remove</distributionManagement>
                <dependencyManagement>remove</dependencyManagement>
                <repositories>remove</repositories>
                <scm>keep</scm>
                <url>keep</url>
                <organization>resolve</organization>
              </pomElements>
            </configuration>
          </execution>
          <execution>
            <id>flatten.clean</id>
            <phase>clean</phase>
            <goals>
              <goal>clean</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

  <repositories>
    <repository>
      <id>spring-milestones</id>
      <name>Spring Milestones</name>
      <url>https://repo.spring.io/milestone</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>
    <repository>
      <id>spring-snapshots</id>
      <name>Spring Snapshots</name>
      <url>https://repo.spring.io/snapshot</url>
      <releases>
        <enabled>false</enabled>
      </releases>
    </repository>
    <repository>
      <id>aliyunmaven</id>
      <name>aliyun</name>
      <url>https://maven.aliyun.com/repository/public</url>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <id>public</id>
      <name>aliyun nexus</name>
      <url>https://maven.aliyun.com/repository/public</url>
      <releases>
        <enabled>true</enabled>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </pluginRepository>
  </pluginRepositories>
</project>

新建HelloWorld工程并配置Pom

<?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">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.example</groupId>
        <artifactId>langchain4j-silentLion</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>langchain4j-01helloworld</artifactId>

    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--        基础API-->
        <dependency>
            <groupId>dev.langchain4j</groupId>
            <artifactId>langchain4j-open-ai</artifactId>
        </dependency>
        <!--        高级 AI 服务 API-->
        <dependency>
            <groupId>dev.langchain4j</groupId>
            <artifactId>langchain4j</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>
</project>

把ApiKey设置为环境变量（mac）

1. 手动修改 nano ~/.zshrc
   2.在文件末尾追加 export DASHSCOPE_API_KEY="you key"
   3.使配置生效 source ~/.zshrc
   4.验证 echo $DASHSCOPE_API_KEY

Spring自动装配LLMConfig

@Configuration
public class LLMConfig {

    @Bean
    public ChatModel chatModelQwen() {
        return OpenAiChatModel.builder()
                .apiKey(System.getenv("DASHSCOPE_API_KEY"))
                .modelName("qwen-plus")
                .baseUrl("https://dashscope.aliyuncs.com/compatible-mode/v1")
                .build();
    }
}

调用接口进行对话

@RestController
@Slf4j
public class HelloLangChain4JController {

    @Autowired
    private ChatModel chatModel;

    @GetMapping("/langchain4j/hello")
    public String hello(@RequestParam(value = "question",defaultValue = "你是谁") String question) {
        String result = chatModel.chat(question);
        return result;
    }
}

效果展示