java和c#使用hessian通信

介绍

hessian主页:http://hessian.caucho.com/

一个简单的例子学习hessian服务:服务端为Java,客户端为C#。

先要准备好C#和Java的第三方类库:http://hessian.caucho.com/

Hssiancharp.dll

hessian-4.0.37.jar

Hessian服务端(java)

打开eclipse创建一个Dynamic Web Project,将hessian-4.0.37.jar放到lib下,大概如图所示:

java和c#使用hessian通信

创建一个通信接口IHello:

package hessian.test.server;

import java.util.ArrayList;

public interface IHello {

    String sayHello(String msg);   

    void sayHello2(int bean);

    void print(String msg);  

    HelloBean getData(HelloBean bean);

    ArrayList<HelloBean> getBeanList();

    ComplexData getComplexData();

}

IHello接口的一个实现:HelloImpl.java

package hessian.test.server;

import java.util.ArrayList;

public class HelloImpl implements IHello{

    public String sayHello(String msg){
return "Hello " + msg;
} public void sayHello2(int bean){
System.out.println("Hello " + bean);
} public void print(String msg){
System.out.println(msg);
} public HelloBean getData(HelloBean bean){
HelloBean result = new HelloBean();
result.setName("lu xiaoxun a new name");
result.setAge(26); System.out.print(bean.getName());
return result;
} public ArrayList<HelloBean> getBeanList(){
ArrayList<HelloBean> beans = new ArrayList<HelloBean>(); HelloBean b1 = new HelloBean();
b1.setName("lu1");
b1.setAge(26);
beans.add(b1); HelloBean b2 = new HelloBean();
b2.setName("lu2");
b2.setAge(27);
beans.add(b2); return beans;
} public ComplexData getComplexData(){
ComplexData data = new ComplexData();
ArrayList<HelloBean> beans = getBeanList();
data.setData(beans, beans.size()); return data;
}
}

定义用来进行数据传输的类,两个类都必须实现Serializable接口:

HelloBean.java

package hessian.test.server;

import java.io.Serializable;

public class HelloBean implements Serializable {

    private static final long serialVersionUID = 570423789882653763L;

    private String name;

    private int age;

    public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public int getAge(){
return age;
} public void setAge(int age){
this.age = age;
} }

ComplexData.java

package hessian.test.server;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map; public class ComplexData implements Serializable{ private static final long serialVersionUID = 1L; private ArrayList<HelloBean> helloBeans; //private Map<String, HelloBean> helloBeanMap; private int number; public int getNumber(){
return number;
} public ArrayList<HelloBean> getHelloBeans(){
return helloBeans;
} public void setData(ArrayList<HelloBean> beans, int num){
this.number = num;
this.helloBeans = beans;
// helloBeanMap = new HashMap<String, HelloBean>();
// for (HelloBean helloBean : beans) {
// if(!helloBeanMap.containsKey(helloBean.getName()))
// {
// helloBeanMap.put(helloBean.getName(), helloBean);
// }
// }
}
}

web.xml内容:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>hessian server</display-name>
<servlet>
<servlet-name>hessian</servlet-name>
<servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>
<init-param>
<param-name>service-class</param-name>
<param-value>hessian.test.server.HelloImpl</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>hessian</servlet-name>
<url-pattern>/hessian</url-pattern>
</servlet-mapping>
</web-app>

Hessian客户端(c#)

定义一个与服务端对应的IHello接口:IHello.cs

    public interface IHello
{
String sayHello(String msg); void sayHello2(int bean); void print(String msg); HelloBean getData(HelloBean bean); HelloBean[] getBeanList(); ComplexData getComplexData();
}

定义与服务器端一致的的通信数据类:

HelloBean.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text; namespace hessian.test.server
{
public class HelloBean
{
public String Name
{
set { name = value; }
get { return name; }
} private String name; //类型和名称需要和服务器端一致 public int Age
{
set { age = value; }
get { return age; }
} private int age; //类型和名称需要和服务器端一致 public override String ToString()
{
return "Name: "+ name + " Age: " + age;
} }
}

ComplexData.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text; namespace hessian.test.server
{
public class ComplexData
{
private HelloBean[] helloBeans; //private Dictionary<String, HelloBean> helloBeanMap; private int number; public int GetNumber()
{
return number;
} public HelloBean[] GetBeans()
{
return helloBeans;
} //public Dictionary<String, HelloBean> GetBeansDic()
//{
// return helloBeanMap;
//}
}
}

在主项目中添加Hessiancsharp.dll引用。

测试代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text; using hessiancsharp.client;
using hessian.test.server; namespace HessianClientTest
{
class Program
{
static void Main(string[] args)
{
string url = @"http://localhost:8080/HessianServerTest/hessian";
CHessianProxyFactory factory = new CHessianProxyFactory(); IHello test = (IHello)factory.Create(typeof(IHello), url); //Test function
Console.WriteLine(test.sayHello("lu")); //打印从服务器端获取的字符串
test.sayHello2(); //在服务器端控制台打印 "Hello 12"
test.print("hessian"); //在服务器端控制台打印 "hessian" //Test Object
HelloBean bean = new HelloBean();
//bean.setName("lu xiaoxun");
bean.Name = "luxiaoxun";
HelloBean result = test.getData(bean);
Console.WriteLine(result.Name);
Console.WriteLine(result.Age);
Console.WriteLine(result); //Test Object Array
HelloBean[] beans = test.getBeanList();
if (beans != null)
{
foreach (HelloBean data in beans)
{
Console.WriteLine(data.ToString());
}
} //Test complex data
ComplexData complexData = test.getComplexData();
if (complexData != null)
{
Console.WriteLine("Array number: " + complexData.GetNumber()); HelloBean[] comArray = complexData.GetBeans();
if (comArray != null)
{
foreach (HelloBean data in comArray)
{
Console.WriteLine(data.ToString());
}
} //Dictionary<String, HelloBean> helloBeanMap = complexData.GetBeansDic();
//if (helloBeanMap != null)
//{
// foreach (String key in helloBeanMap.Keys)
// {
// Console.WriteLine(helloBeanMap[key].GetHelloBeanInfo());
// }
//}
} Console.ReadKey();
}
}
}

测试结果:

java和c#使用hessian通信

注意事项:

1、服务端和客户端用于数据传递的对象的命名空间要一致

IHello接口所在命名空间服务端和客户端可以不一致,但是IHello中用到的HelloBean和ComplexData在Java服务端和C#客户端中两个HelloBean类所在的命名空间要一致。

2、类的字段要一致

用于数据传输的类的字段名和字段类型要一致(修饰类型可以不一致)。

3、服务端的类要序列化

4、尽量使用基本的数据类型

从上面的测试可以看出,传递基本的类型没有问题,传递普通的类对象没有问题,传递ArrayList的时候也没有问题(C#客户端使用Array数组),但是传递HashMap字典的时候会有问题,C#这边使用Dictionary没法对应一致,可能是由于hash函数内部实现不一致导致的,具体原因不明。

测试代码:HessianTest.rar

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