Hessian是跨語言基於HTTP的RPC框架，傳輸的資料格式是二機制。網上找了很多例子，基本上都是同語言之間的RPC呼叫例子，基本沒有跨語言的，自己折騰一下，使用Java編寫PRC服務端，使用Java和Python作為客戶端呼叫RPC服務。

Java 服務端程式碼：

package app.demo;
import java.io.Serializable;

public class User implements Serializable {

    private static final long serialVersionUID = 153519254199840035L;

    String userName = "snoopy"
 
;
    String password = "showme";

    public User(String user, String pwd) {
        this.userName = user;
        this.password = pwd;
    }

    public String getUserName() {
        return userName;
    }

    public String getPassword() {
        return password;
    }
}

package app.demo;

public
 
 interface BasicAPI {

    public void setGreeting(String greeting);

    public String hello();

    public User getUser();
}

package app.demo;

public class BasicService implements BasicAPI {

    private String _greeting = "Hello, world";

    public void setGreeting(String greeting) {
        _greeting = greeting;
        System.out.println("set greeting success:"
 
 + _greeting);
    }

    public String hello() {
        return _greeting;
    }

    public User getUser() {
        return new User("prance", "meshow");
    }
}

Java 客戶端程式碼：
（因為Hessian是跨語言的，所以客戶端呼叫資料返回時，轉化成物件並不要求包名，類名一致。當然一般情況下服務端開發的同學會提供客戶端呼叫的同學sdk，sdk裡資料返回的類跟服務端是一致的，這裡只是為了測試）

public class User2 implements Serializable {

    private static final long serialVersionUID = 153519254199830056L;

    String userName = "snoopy";
    String password = "showme";

    public User2(String user, String pwd) {
        this.userName = user;
        this.password = pwd;
    }

    public String getUserName() {
        return userName;
    }

    public String getPassword() {
        return password;
    }
}

public interface BasicAPI2 {

    public void setGreeting(String greeting);

    public String hello();

    public User2 getUser();
}

import app.demo2.BasicAPI2;
import com.caucho.hessian.client.HessianProxyFactory;

public class BasicClient {
    public static void main(String[] args) throws Exception {
        //String url = "http://127.0.0.1:8080/Hessian/hello";
        String url = "http://localhost:8080/EasyHessian/hello";
        HessianProxyFactory factory = new HessianProxyFactory();
        //BasicAPI basic = (BasicAPI) factory.create(BasicAPI.class, url);
        BasicAPI2 basic = (BasicAPI2) factory.create(BasicAPI2.class, url);
        System.out.println("Hello:" + basic.hello());
        System.out.println("Hello:" + basic.getUser());
        System.out.println("Hello:" + basic.getUser().getUserName());
        System.out.println("Hello:" + basic.getUser().getPassword());
        basic.setGreeting("HelloGreeting");
        System.out.println("Hello:" + basic.hello());
    }
}

Python客戶端程式碼：

#!python
# encoding: utf-8

'''
使用Python語言實現遠端呼叫
使用Python客戶端來進行遠端呼叫，我們可以從https://github.com/bgilmore/mustaine下載，然後安裝Hessian的代理客戶端Python實現庫：
git clone https://github.com/bgilmore/mustaine.git
cd mustaine
sudo python setup.py install

http://san-yun.iteye.com/blog/1628405
http://pydoc.net/Python/mustaine/0.1.7/mustaine.parser/

https://github.com/Kingson4Wu/Frieza-revenge/blob/master/RPC-framework%2Fsrc%2Fmain%2Fjava%2Fapp%2Fdemo%2FBasicService.java

'''


from mustaine.client import HessianProxy
test = HessianProxy("http://localhost:8080/EasyHessian/hello")
print test._headers
print test.hello()
print test.getUser()
print test.getUser().userName
user = test.getUser()
print user.password
test.setGreeting("Hessian Python")
print test.hello()