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)念悾瑑蓚€(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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