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java和c#使用hessian通信的方法

 更新時(shí)間：2014年09月15日 09:52:52   投稿：shichen2014  
這篇文章主要介紹了java和c#使用hessian通信的方法,服務(wù)器端為Java,客戶端為C#實(shí)現(xiàn)。是一個(gè)非常實(shí)用的技巧,需要的朋友可以參考下

本文實(shí)例講述了java和c#使用hessian通信的方法，是非常實(shí)用的技巧。分享給大家供大家參考。具體分析如下：

首先，hessian主頁為：http://hessian.caucho.com/

下面通過一個(gè)簡(jiǎn)單的例子學(xué)習(xí)hessian服務(wù)：服務(wù)端為Java，客戶端為C#。

先要準(zhǔn)備好C#和Java的第三方類庫，下載地址：http://hessian.caucho.com/

下載 Hssiancharp.dll及hessian-4.0.37.jar

Hessian服務(wù)端（java）：

打開eclipse創(chuàng)建一個(gè)Dynamic Web Project，將hessian-4.0.37.jar放到lib下，大概如圖所示：

創(chuàng)建一個(gè)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接口的一個(gè)實(shí)現(xiàn)：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;
  }
}

定義用來進(jìn)行數(shù)據(jù)傳輸?shù)念?，兩個(gè)類都必須實(shí)現(xiàn)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內(nèi)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客戶端（c#）：

定義一個(gè)與服務(wù)端對(duì)應(yīng)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();
  }

定義與服務(wù)器端一致的的通信數(shù)據(jù)類：

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; //類型和名稱需要和服務(wù)器端一致

    public int Age
    {
      set { age = value; }
      get { return age; }
    }

    private int age; //類型和名稱需要和服務(wù)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;
    //}
  }
}

在主項(xiàng)目中添加Hessiancsharp.dll引用。

測(cè)試代碼：

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"));  //打印從服務(wù)器端獲取的字符串
      test.sayHello2(12);            //在服務(wù)器端控制臺(tái)打印 "Hello 12"  
      test.print("hessian");          //在服務(wù)器端控制臺(tái)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();
    }
  }
}

測(cè)試結(jié)果如下圖所示：

注意事項(xiàng)：

1、服務(wù)端和客戶端用于數(shù)據(jù)傳遞的對(duì)象的命名空間要一致

IHello接口所在命名空間服務(wù)端和客戶端可以不一致，但是IHello中用到的HelloBean和ComplexData在Java服務(wù)端和C#客戶端中兩個(gè)HelloBean類所在的命名空間要一致。

2、類的字段要一致

用于數(shù)據(jù)傳輸?shù)念惖淖侄蚊妥侄晤愋鸵恢拢ㄐ揎楊愋涂梢圆灰恢拢?/p>

3、服務(wù)端的類要序列化

4、盡量使用基本的數(shù)據(jù)類型
從上面的測(cè)試可以看出，傳遞基本的類型沒有問題，傳遞普通的類對(duì)象沒有問題，傳遞ArrayList的時(shí)候也沒有問題（C#客戶端使用Array數(shù)組），但是傳遞HashMap字典的時(shí)候會(huì)有問題，C#這邊使用Dictionary沒法對(duì)應(yīng)一致，可能是由于hash函數(shù)內(nèi)部實(shí)現(xiàn)不一致導(dǎo)致的，具體原因不明。

感興趣的朋友可以測(cè)試一下本文實(shí)例，源碼點(diǎn)擊此處本站下載。

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