Hessian序列化实例

Hessian也是一种可以做序列化的工具，他也支持多语言，这里介绍java中做序列化的示例。Hessian序列化和jdk自带的序列化，思路基本一样，只不过Hessian序列化之后，字节数更小，性能更优。另外Hessian提供了两套api，默认是hessian，也提供了一个升级版本的hessian2的序列化api，从名字上看，hessian2应该是序列化性能更优，如果使用Hessian做序列化，推荐使用升级版本的api。

这里以jdk自带的序列化和HessianOutput，Hessian2Output序列化来做对比，看看他们的序列化效果。

在使用Hessian序列化之前，需要在maven工程中，引入Hessian依赖：

<dependency><groupId>com.caucho</groupId><artifactId>hessian</artifactId><version>4.0.62</version></dependency>

无论jdk序列化，还是hessian序列化，实体类均需要实现Serializable接口，这里以Student实体为例：

package com.xxx.serial.hessian;import java.io.Serializable;public class Student implements Serializable{/*** */private static final long serialVersionUID = 1L;private int id;private String name;private transient String gender;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 String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}public Student() {}public Student(int id,String name,String gender){this.id = id;this.name = name;this.gender = gender;}@Overridepublic String toString() {return "User(id="+id+",name="+name+",gender="+gender+")";}}

我们准备测试类，编写序列化，反序列化方法：

package com.xxx.serial.hessian;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.ObjectOutputStream;import com.caucho.hessian.io.Hessian2Input;import com.caucho.hessian.io.Hessian2Output;import com.caucho.hessian.io.HessianInput;import com.caucho.hessian.io.HessianOutput;public class SerialTest {public static <T> byte[] serialize(T t){byte[] data = null;try {ByteArrayOutputStream os = new ByteArrayOutputStream();HessianOutput output = new HessianOutput(os);output.writeObject(t);data = os.toByteArray();} catch (Exception e) {e.printStackTrace();}return data;}public static <T> byte[] serialize2(T t){byte[] data = null;try {ByteArrayOutputStream os = new ByteArrayOutputStream();Hessian2Output output = new Hessian2Output(os);output.writeObject(t);output.getBytesOutputStream().flush();pleteMessage();output.close();data = os.toByteArray();} catch (Exception e) {e.printStackTrace();}return data;}public static <T> byte[] jdkSerialize(T t){byte[] data = null;try {ByteArrayOutputStream os = new ByteArrayOutputStream();ObjectOutputStream output = new ObjectOutputStream(os);output.writeObject(t);output.flush();output.close();data = os.toByteArray();} catch (Exception e) {e.printStackTrace();}return data;}@SuppressWarnings("unchecked")public static <T> T deserialize(byte[] data){if(data==null){return null;}Object result = null;try {ByteArrayInputStream is = new ByteArrayInputStream(data);HessianInput input = new HessianInput(is);result = input.readObject();} catch (Exception e) {e.printStackTrace();}return (T)result;}@SuppressWarnings("unchecked")public static <T> T deserialize2(byte[] data){if(data==null){return null;}Object result = null;try {ByteArrayInputStream is = new ByteArrayInputStream(data);Hessian2Input input = new Hessian2Input(is);result = input.readObject();} catch (Exception e) {e.printStackTrace();}return (T)result;}public static void main(String[] args) {Student stu = new Student(1,"hessian","boy");byte[] obj = serialize(stu);System.out.println("hessian serialize result length = "+obj.length);byte[] obj2 = serialize2(stu);System.out.println("hessian2 serialize result length = "+obj2.length);byte[] other = jdkSerialize(stu);System.out.println("jdk serialize result length = "+other.length);Student student = deserialize2(obj2);System.out.println("deserialize result entity is "+student);}}

运行测试类主方法，打印信息如下：

通过测试 ，我们发现hessian序列化的结果，比jdk序列化要好很多，而且hessian2序列化比hessian更好，hessian2序列化的结果几乎是jdk序列化的1/2，如果使用Hessian做序列化，推荐使用hessian2的api。