用jython实现java调用python

在Eclipse中创建springboot工程（maven）
配置pom.xml
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.0.5</version>
        <relativePath/> 
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-json</artifactId>
        </dependency>

<dependency>
            <groupId>org.python</groupId>
            <artifactId>jython-slim</artifactId>
            <version>2.7.3</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>
编写python代码
/src/main/resources/case.py
class RequestObj:
    def __init__(self,requestId):
        self.requestid=requestId

class ResponseObj:
    def __init__(self,apiId):
        self.apiId=apiId

def testAPI(requestObj):
    if requestObj.requestId == "1" :
        responseObj=ResponseObj("/test/1")
    elif requestObj.requestId == "2" :
        responseObj=ResponseObj("/test/2")
    else:
        responseObj=ResponseObj("/test")
    return responseObj
编写java代码
/src/main/java/com/example/demo/json/Request.java
package com.example.demo.json;

public class Request {
    private String requsetId;
    private String name;

public String getName() {
        return name;
    }

public void setName(String name) {
        this.name = name;
    }

public String getRequsetId() {
        return requsetId;
    }

public void setRequsetId(String requsetId) {
        this.requsetId = requsetId;
    }

}
/src/main/java/com/example/demo/json/Response.java
package com.example.demo.json;

public class Response {
    private String apiId;

public String getApiId() {
        return apiId;
    }

public void setApiId(String apiId) {
        this.apiId = apiId;
    }

}
/src/main/java/com/example/demo/RestAPIController.java
package com.example.demo;

import java.io.IOException;

import org.python.core.PyFunction;
import org.python.core.PyObject;
import org.python.core.PyString;
import org.python.util.PythonInterpreter;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import com.example.demo.json.Request;
import com.example.demo.json.Response;

@RestController
public class RestAPIController {
    private static PythonInterpreter interpreter;
    private static Resource resource = new ClassPathResource("case.py");
    private static String path;
    static {
        interpreter = new PythonInterpreter();
        try {
            path = resource.getFile().getPath();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

private Response callPythonFunc(String funcName, Request request) {
        interpreter.execfile(path);
        PyObject requestObj = interpreter.get("RequestObj", PyObject.class);
        requestObj.__setattr__("requestId", new PyString(request.getRequsetId()));
        PyFunction function = interpreter.get(funcName, PyFunction.class);
        PyObject responseObj = function.__call__(requestObj);
        String apiId = responseObj.__getattr__("apiId").toString();
        Response response = new Response();
        response.setApiId(apiId);
        return response;
    }

@GetMapping("/test/get")
    public String test1() {
        Request request = new Request();
        request.setRequsetId("1");
        Response response = callPythonFunc("testAPI", request);
        return response.getApiId();
    }

@PostMapping("/test/post")
    public Response test2(@RequestBody Request request) {
        Response response = callPythonFunc("testAPI", request);
        return response;
    }
}
运行springboot应用程序,console信息如下
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v3.0.5)
2023-05-20T23:07:51.546+09:00 INFO 17548 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication using Java 17.0.6 with PID 17548 (D:\pleiades\workspace\demo\target\classes started by lzqdi in D:\pleiades\workspace\demo)
2023-05-20T23:07:51.550+09:00 INFO 17548 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to 1 default profile: "default"
2023-05-20T23:07:52.760+09:00 INFO 17548 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2023-05-20T23:07:52.777+09:00 INFO 17548 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2023-05-20T23:07:52.778+09:00 INFO 17548 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.7]
2023-05-20T23:07:52.904+09:00 INFO 17548 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2023-05-20T23:07:52.908+09:00 INFO 17548 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1286 ms
2023-05-20T23:07:55.673+09:00 INFO 17548 --- [ main] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page: class path resource [static/index.html]
2023-05-20T23:07:55.832+09:00 INFO 17548 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2023-05-20T23:07:55.846+09:00 INFO 17548 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 4.604 seconds (process running for 5.36)
2023-05-20T23:08:36.469+09:00 INFO 17548 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2023-05-20T23:08:36.469+09:00 INFO 17548 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2023-05-20T23:08:36.474+09:00 INFO 17548 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Completed initialization in 5 ms
启动Postman进行测试
■项目文件构成如下