java调用python接口问题

Question

现有一个python源码XXXX.py 存放在桌面上

现在有一个python代码片段

def detect(imgfile)

返回参数为:

 return sorted_label, origimg

其中需要往其中传递一个String类型的url
求大神给出java调用此接口的代码 谢谢大神们

Answer 1

/**
 * Jython环境,生存python解释器
 * @author webim
 *
 */
public final class JythonEnvironment
{
    private static JythonEnvironment INSTANCE = new JythonEnvironment();

    /**
     * 私有构造方法
     */
    private JythonEnvironment()
    {
    }

    /**
     * 获取单例
     * @return JythonEnvironment
     */
    public static JythonEnvironment getInstance()
    {
        return INSTANCE;
    }

    /**
     * 获取python系统状态,可根据需要指定classloader/sys.stdin/sys.stdout等
     * @return PySystemState
     */
    private PySystemState getPySystemState()
    {
        PySystemState.initialize();
        final PySystemState py = new PySystemState();
        py.setClassLoader(getClass().getClassLoader());
        return py;
    }

    /**
     * 获取python解释器
     * @return PythonInterpreter
     */
    public PythonInterpreter getPythonInterpreter(){
        PythonInterpreter inter = new PythonInterpreter(null, getPySystemState());
//        PythonInterpreter inter = new PythonInterpreter();
        return inter;
    }
}

添加 JPython 依赖
<dependency>
            <groupId>org.python</groupId>
            <artifactId>jython</artifactId>
            <version>2.7.0</version>
        </dependency>

上面这个依赖有问题，可用下面依赖避免各种问题。

        <dependency>
            <groupId>org.python</groupId>
            <artifactId>jython-standalone</artifactId>
            <version>2.7.0</version>
        </dependency>
/*enum的这个用法,可以作为变种的安全单例,值得借鉴哦 ^_^ */
@Service
@Component
public class ExecPython {

    public static final Logger logger = LoggerFactory.getLogger(Exception.class);

    //定义 python 解释器
    private static PythonInterpreter inter;

    public ExecPython() {
        this.inter  = JythonEnvironment.getInstance().getPythonInterpreter();
        this.inter.execfile("C:\\test.py");
    }

    //设置 python 脚本的路径
    public void setPythonPath (String pythonPath){
        this.inter.execfile(pythonPath);
    }



    public void execute(String scriptFile, Map<String,String> properties)
    {
        logger.info("获取解释器");
        try
        {

            PyFunction getNetInfo = (PyFunction) inter.get("getNetInfo", PyFunction.class);
            PyObject netInfo = getNetInfo.__call__();
            System.out.println("anwser = " + netInfo.toString());
        }
        catch (Exception e)
        {
            e.printStackTrace();
            logger.info("Python 脚本文件执行失败");
        }
    }

    //获取 Python 字符串
    public String getString(){
//获取到python 脚本中的接口
        PyFunction func = (PyFunction) inter.get("adder", PyFunction.class);
        PyObject pyobj = func.__call__();
        System.out.println("anwser = " + pyobj.toString());
        return pyobj.toString();
    }
    // 获取当前数组
    public String getArr() {
        PyFunction getArr = (PyFunction) inter.get("getArr", PyFunction.class);
        PyObject pyobjTwo = getArr.__call__();
        pyobjTwo.__len__();
        System.out.println("anwser = " + pyobjTwo.toString()+" len:"+pyobjTwo.__len__());

        //将 PyObject 对象转换成 java  对象
        //Object object = pyobjTwo.__tojava__(List.class);
        //List<String> list = (List<String>) object;

        //将查询到数据转换成一个 JSON 字符串
        String result = pyobjTwo.toString();
        String JsonStr = "{" + result + "}";
        logger.info(JsonStr);
        logger.info("将查询的结果转换成 JSON 字符串：",JsonStr);

        return pyobjTwo.toString();
    }
}