java和c#使用hessian通信的方法

2020-01-24 02:25:13

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本文實例講述了java和c#使用hessian通信的方法，是非常實用的技巧。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/

下面通過一個簡單的例子學習hessian服務：服務端為Java，客戶端為C#。

先要準備好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服務端（java）：

打開eclipse創建一個Dynamic Web Project，將hessian-4.0.37.jar放到lib下，大概如圖所示：

創建一個通信接口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接口的一個實現：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;  }}

定義用來進行數據傳輸的類，兩個類都必須實現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#）：

定義一個與服務端對應的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();  }

定義與服務器端一致的的通信數據類：

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;    //}  }}

在主項目中添加Hessiancsharp.dll引用。

測試代碼：

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

測試結果如下圖所示：

注意事項：

1、服務端和客戶端用于數據傳遞的對象的命名空間要一致

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

2、類的字段要一致

用于數據傳輸的類的字段名和字段類型要一致（修飾類型可以不一致）。

3、服務端的類要序列化

4、盡量使用基本的數據類型
從上面的測試可以看出，傳遞基本的類型沒有問題，傳遞普通的類對象沒有問題，傳遞ArrayList的時候也沒有問題（C#客戶端使用Array數組），但是傳遞HashMap字典的時候會有問題，C#這邊使用Dictionary沒法對應一致，可能是由于hash函數內部實現不一致導致的，具體原因不明。

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