hessian序列化区别

背景：

之前一篇文章介绍了java的序列化，http://blog.csdn.net/bohu83/article/details/51124079

在java的序列化里面也是介绍rpc框架时候，在远程调用中，需要把参数和返回值通过网络传输，这个使用就要用到序列化将对象转变成字节流，从一端到另一端之后再反序列化回来变成对象。作用了说了，今天在看文章的时候发现别人贴出效率对比，hessian比java的序列化高出很多。特意补充下相关知识点。

百科：Hessian是一个轻量级的remoting onhttp工具，使用简单的方法提供了RMI的功能。 相比WebService，Hessian更简单、快捷。采用的是二进制RPC协议，因为采用的是二进制协议，所以它很适合于发送二进制数据。

hessian序列化

hessian序列化比Java序列化高效很多，而且生成的字节流也要短很多。

测试的demo:客户端通过Hessian序列号协议序列化对象，通过Http Post方式提交到服务器端。

package hessian;import java.io.ByteArrayOutputStream;import java.io.InputStream;import java.util.Date;import org.apache.http.HttpEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.ByteArrayEntity;import org.apache.http.entity.ContentType;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;  import com.caucho.hessian.io.Hessian2Input;import com.caucho.hessian.io.Hessian2Output; public class Test {     public static String urlName = "http://localhost:8080/springmvc-chapter6/hello";     public static void main(String[] args) throws Throwable {         // 序列化        ByteArrayOutputStream os = new ByteArrayOutputStream();        Hessian2Output h2o = new Hessian2Output(os);         h2o.startMessage();        h2o.writeObject(getPerson());        h2o.writeString("I am client.");        h2o.completeMessage();        h2o.close();         byte[] buffer = os.toByteArray();        os.close();         ByteArrayEntity byteArrayEntity = new ByteArrayEntity(buffer,                ContentType.create("x-application/hessian", "UTF-8"));                 CloseableHttpClient client = HttpClients.createDefault();        HttpPost post = new HttpPost(urlName);        post.setEntity(byteArrayEntity);        CloseableHttpResponse response = client.execute(post);         System.out.println("response status:\n"                + response.getStatusLine().getStatusCode());        HttpEntity body = response.getEntity();        System.out.println("body:"+body);//        InputStream is = body.getContent();//        Hessian2Input h2i = new Hessian2Input(is);//        h2i.startMessage();// //        Person person = (Person) h2i.readObject();//        System.out.println("response:\n" + person.toString());//        System.out.println(h2i.readString());// //        h2i.completeMessage();//        h2i.close();//        is.close();    }     public static Person getPerson() {        Person person = new Person();        person.setAddress(new String[] { "Beijing", "TaiWan", "GuangZhou" });        person.setBrithday(new Date());        person.setGender(false);        person.setHeight(168.5D);        person.setId(300);        person.setName("Jack");        person.setPhone(188888888);        person.setWeight(55.2F);        return person;    }}

接受：

package cn.javass.chapter6.web.controller;import hessian.Person;import java.io.IOException;import javax.servlet.ServletInputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import com.caucho.hessian.io.Hessian2Input;//@RequestMapping@Controllerpublic class HelloWorldController {    @RequestMapping(value = "/hello")    public String helloWorld(HttpServletRequest request, HttpServletResponse response) throws IOException {            // 处理请求        ServletInputStream sis = request.getInputStream();        Hessian2Input h2i = new Hessian2Input(sis);         h2i.startMessage();        Person person = (Person) h2i.readObject();        System.out.println("receive:\n" + person.toString());        System.out.println(h2i.readString());        h2i.completeMessage();        h2i.close();        sis.close();        return person.toString();}}

package hessian;import java.io.Serializable;import java.util.Date;public class Person implements Serializable {private static final long serialVersionUID = -1923645274767028479L;private String[] address;private Date brithday; private boolean gender;private double height;private int id;private String name;private int phone;private float weight;public String[] getAddress() {return address;}public void setAddress(String[] address) {this.address = address;}public Date getBrithday() {return brithday;}public void setBrithday(Date brithday) {this.brithday = brithday;}public boolean isGender() {return gender;}public void setGender(boolean gender) {this.gender = gender;}public double getHeight() {return height;}public void setHeight(double height) {this.height = height;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getPhone() {return phone;}public void setPhone(int phone) {this.phone = phone;}public float getWeight() {return weight;}public void setWeight(float weight) {this.weight = weight;}}

运行结果如下：

2016-04-22 17:49:23 [http-8080-1] DEBUG org.springframework.web.servlet.DispatcherServlet - DispatcherServlet with name 'chapter6' processing POST request for [/springmvc-chapter6/hello]2016-04-22 17:49:23 [http-8080-1] DEBUG org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Looking up handler method for path /hello2016-04-22 17:49:24 [http-8080-1] DEBUG org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Returning handler method [public java.lang.String cn.javass.chapter6.web.controller.HelloWorldController.helloWorld(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) throws java.io.IOException]2016-04-22 17:49:24 [http-8080-1] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'helloWorldController'receive:Person [address=[Beijing, TaiWan, GuangZhou], brithday=Fri Apr 22 17:49:23 CST 2016, gender=false, height=168.5, id=300, name=Jack, phone=188888888, weight=55.2]I am client.2016-04-22 17:49:26 [http-8080-1] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Invoking afterPropertiesSet() on bean with name 'Person [address=[Beijing, TaiWan, GuangZhou], brithday=Fri Apr 22 17:49:23 CST 2016, gender=false, height=168.5, id=300, name=Jack, phone=188888888, weight=55.2]'2016-04-22 17:49:26 [http-8080-1] DEBUG org.springframework.web.servlet.DispatcherServlet - Rendering view [org.springframework.web.servlet.view.JstlView: name 'Person [address=[Beijing, TaiWan, GuangZhou], brithday=Fri Apr 22 17:49:23 CST 2016, gender=false, height=168.5, id=300, name=Jack, phone=188888888, weight=55.2]'; URL [/WEB-INF/jsp/Person [address=[Beijing, TaiWan, GuangZhou], brithday=Fri Apr 22 17:49:23 CST 2016, gender=false, height=168.5, id=300, name=Jack, phone=188888888, weight=55.2].jsp]] in DispatcherServlet with name 'chapter6'2016-04-22 17:49:26 [http-8080-1] DEBUG org.springframework.web.servlet.view.JstlView - Forwarding to resource [/WEB-INF/jsp/Person [address=[Beijing, TaiWan, GuangZhou], brithday=Fri Apr 22 17:49:23 CST 2016, gender=false, height=168.5, id=300, name=Jack, phone=188888888, weight=55.2].jsp] in InternalResourceView 'Person [address=[Beijing, TaiWan, GuangZhou], brithday=Fri Apr 22 17:49:23 CST 2016, gender=false, height=168.5, id=300, name=Jack, phone=188888888, weight=55.2]'2016-04-22 17:49:26 [http-8080-1] DEBUG org.springframework.web.servlet.DispatcherServlet - Successfully completed request

总结：

1、序列化对象要实现java.io.Serializable接口。

2、单文本传输没必要使用hessian，pojo适合用hessian，但是要注意序列化的规范，可能特殊类型支持的不够完善。
本文是是初步使用，背后的原理待整理。

参考：

http://aiilive.blog.51cto.com/1925756/1601574