hessian學習筆記

時間 2019-12-04

標籤 hessian 學習筆記简体版

原文原文鏈接

1、hessian是什麼

Hessian是一個輕量級的remoting onhttp工具，使用簡單的方法提供了RMI的功能。相比WebService，Hessian更簡單、快捷。採用的是二進制RPC協議，由於採用的是二進制協議，因此它很適合於發送二進制數據。——百度百科html

學習hessian，必須知道什麼是RPC。git

實現RPC，必須解決以下幾個問題：github

一、通信問題。web

二、尋址問題。spring

三、序列化與反序列化。apache

帶着這三個問題咱們一塊兒來探究一下hessian；api

2、hessian怎麼使用

首先，你們去下載源碼，並導入到idea中打開；網絡

https://github.com/zhaojiatao/learn_hessianmvc

項目結構：app

--learn_hessian

----api　　客戶端和服務端均共同引用的接口api

----client　　客戶端調用demo，包括本地直接經過代理對象調用以及使用spring集成方式調用

----webserver　　經過傳統servlet方式提供服務

----webserver_spring　　與spring集成提供服務

2.1服務端搭建：

2.1.1傳統serlet方式搭建

在web.xml中配置HessianServlet，

指明服務地址：/hessian

及其實現類：com.zjt.learn.hessian.api.impl.GetUserInfoImpl

<servlet>
    <servlet-name>HessianServlet</servlet-name>
    <servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>
    <init-param>
      <param-name>service-class</param-name>
      <param-value>com.zjt.learn.hessian.api.impl.GetUserInfoImpl</param-value>
    </init-param>
  </servlet>

  <servlet-mapping>
    <servlet-name>HessianServlet</servlet-name>
    <url-pattern>/hessian</url-pattern>
  </servlet-mapping>

package com.zjt.learn.hessian.api.impl;

import com.zjt.learn.hessian.api.GetUserInfo;
import com.zjt.learn.hessian.dto.User;
import org.apache.commons.lang3.StringUtils;

/**
 * Created by zhaojiatao@souche.com on 2018/4/17
 */
public class GetUserInfoImpl implements GetUserInfo {
    @Override
    public String getuserinfo(String id) {

        if(StringUtils.isNotBlank(id)){
            User user=new User();
            user.setId("1");
            user.setName("zhaojiatao");
            user.setAddress("hangzhou");
            user.setAge(18);
            user.setGender(1);
            return user.toString();
        }

        return null;
    }
}

2.1.2使用spring方式集成發佈服務

首先在web.xml中配置springmvc：

<servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/remote/*</url-pattern>
  </servlet-mapping>

配置applicationContext.xml:

使用HessianServiceExporter來處理請求；

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.1.xsd"
       default-lazy-init="true">

    <bean id = "getuserService" class="com.zjt.learn.hessian.api.impl.GetUserInfoImpl"/>

    <bean name="/getuserHessianService" class="org.springframework.remoting.caucho.HessianServiceExporter">
        <property name="service" ref="getuserService"/>
        <property name="serviceInterface" value="com.zjt.learn.hessian.api.GetUserInfo"/>
    </bean>
</beans>

2.2客戶端調用

2.2.1使用傳統方式調用遠程服務

package test;

import com.caucho.hessian.client.HessianProxyFactory;
import com.zjt.learn.hessian.api.GetUserInfo;

/**
 * Created by zhaojiatao@souche.com on 2018/4/17
 */
public class BasicClient {

    public static void main(String[] args) {
        try {
            String url = "http://localhost:8080/hessian";
            HessianProxyFactory factory = new HessianProxyFactory();
            factory.setOverloadEnabled(true);
            GetUserInfo getUserInfo = (GetUserInfo) factory.create(GetUserInfo.class, url);
            System.out.println(getUserInfo.getuserinfo("1"));
            System.out.println("over");
        }catch (Exception e){
            e.printStackTrace();
        }
    }




}

2.2.2使用spring方式調用

新建spring.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.1.xsd"
       default-lazy-init="true">


    <bean id="getuserService" class="org.springframework.remoting.caucho.HessianProxyFactoryBean">
        <property name="serviceUrl" value="http://localhost:8080/remote/getuserHessianService"/>
        <property name="serviceInterface" value="com.zjt.learn.hessian.api.GetUserInfo"/>
    </bean>
</beans>

package test;

import com.zjt.learn.hessian.api.GetUserInfo;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Created by zhaojiatao@souche.com on 2018/4/18
 */
public class BasicSpringClient {


    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"classpath:spring.xml"});
        GetUserInfo getUserInfo = (GetUserInfo)context.getBean("getuserService");
        System.out.println(getUserInfo.getuserinfo("1"));
    }


}