Mule安裝與開發部署一個簡單例子

    本文介紹如何安裝Mule，並且開發一個簡單的Mule例子。
1.下載Mule
    到Mule官方網站下載Mule的社區版本，注意企業版本需要收費，而社區版本已經滿足開發需要，並且開發源代碼。下載地址是：[url]http://www.mulesource.org/display/MULE/Download[/url]。筆者下載的Mule版本是mule2.1.1。
2.安裝需要的軟件
    (1)安裝JDK1.6,這裏就不詳細描述。
    (2)到[url]http://maven.apache.org/[/url] 下載Maven，下載Maven2.0.9版本。如果你只想使用mule，而不想編譯mule自帶的例子和mule源碼，就不需要下載Maven。
    (3)設置Maven的repository directory爲c:\.m2\repository。如果是windows系統，在dos命令下創建.m2命令：mkdir .m2。
    (4)設置環境變量，也可以在界面中設置：
    Linux環境:
    export JAVA_HOME=/opt/java/jdk
    export MAVEN_HOME=/opt/apache/maven-2.0.9
    export MAVEN_OPTS=-Xmx512m -XX:MaxPermSize=256
    export MULE_HOME=/opt/mule
    export PATH=$PATH:$JAVA_HOME/bin:$MAVEN_HOME/bin:$MULE_HOME/bin
    Windows環境：
    set JAVA_HOME=C:\Program Files\Java\jdk
    set MAVEN_HOME=C:\Apache\maven-2.0.9
    set MAVEN_OPTS=-Xmx512m -XX:MaxPermSize=256
    set MULE_HOME=C:\Mule
    set PATH=%PATH%;%JAVA_HOME%/bin;%MAVEN_HOME%/bin;MULE_HOME/bin
   
3.測試安裝是否成功
    在命令行下輸入maven -version查看maven是否安裝成功，輸入mule查看mule是否安裝成功。如果成功，就可以開始第一個Mule應用開發了。

4.開發第一個mule例子——Hello
    (1)新建一個eclipse java工程，工程名稱是：MyHello，創建包org.foo，在這個包下新建接口(interface) MyTestInterface，代碼如下：

package org.foo;

public interface MyTestInterface {
  public String hello(String aname);
}

    (2)在這個包下新建類MyTest，代碼如下：

package org.foo;

public class MyTest implements MyTestInterface
{
  public String hello(String aname)
  {
    return "you are: " + aname;
  }

}

    (3)在工程下新建文件夾conf用於存放工程配置文件，新建文件myhello-config.xml，內容如下：

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesource.org/schema/mule/core/2.1"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:spring="http://www.springframework.org/schema/beans"
             xmlns:stdio="http://www.mulesource.org/schema/mule/stdio/2.1"
             xmlns:vm="http://www.mulesource.org/schema/mule/vm/2.1"
        xsi:schemaLocation="
             [url]http://www.springframework.org/schema/beans[/url] [url]http://www.springframework.org/schema/beans/spring-beans-2.5.xsd[/url]
             [url]http://www.mulesource.org/schema/mule/core/2.1[/url] [url]http://www.mulesource.org/schema/mule/core/2.1/mule.xsd[/url]
             [url]http://www.mulesource.org/schema/mule/stdio/2.1[/url] [url]http://www.mulesource.org/schema/mule/stdio/2.1/mule-stdio.xsd[/url]
             [url]http://www.mulesource.org/schema/mule/vm/2.1[/url] [url]http://www.mulesource.org/schema/mule/vm/2.1/mule-vm.xsd[/url]">

        <de.ion>
                This is a simple component example that demostrates how to expose
                a component over multiple transports.
        </de.ion>

     <!--
                The stdio connector is used to send and receive information via System.in and System.out.
                Note this connector is .ly really useful for testing purposes.
                        promptMessage - is what is written to the console
                        messageDelayTime - is the time in milliseconds before the user is prompted again.
                These properties are set as bean properties . the connector.
        -->
        <stdio:connector name="SystemStreamConnector"
                promptMessage="Please enter yout name: "
                messageDelayTime="1000"/>

        <!--
                The Mule model initialises and manages your UMO components
        -->
        <model name="MyHelloSample">
                <!--
                        A Mule service defines all the necessary information about how your components will
                        interact with the framework, other components in the system and external sources.
                        Please refer to the Configuration Guide for a full de.ion of all the parameters.
                -->
                <service name="MyHelloUMO">
                        <!-- any number of endpoints can be added to an inbound router -->
                        <inbound>
                                <stdio:inbound-endpoint system="IN"/>
                                <!--vm:inbound-endpoint path="echo"/-->
                        </inbound>

                        <component class="org.foo.MyTest"/>

                        <!--
                                An outbound router can have .e or more router configurations that can be
                                invoked depending . business rules, message contents, headers or any other
                                criteria. The pass-through-router is a router that automatically passes
                                on every message it receives
                        -->
                        <outbound>
                                <pass-through-router>
                                        <stdio:outbound-endpoint system="OUT"/>
                                </pass-through-router>
                        </outbound>
                </service>
        </model>
</mule>

    (4)至此，一個Mule服務就開發完成了，是不是很容易？接下來就部署這個服務。右擊該工程，點擊“export”，將工程導出到一個目錄，命名爲MyHello.jar，然後將這個jar包放到C:\Mule\mule-2.1.2\lib\user下（我的Mule安裝到C:\Mule目錄下）。這樣部署就完成了。
    (5)運行mule服務，有兩種方式。第一種比較直接和簡單，在命令行中輸入：mule -config conf/myhello-config.xml即可。第二種，在MyHello工程文件目錄下新建一個文件myHello.bat，內容如下：

@echo off
setlocal
REM There is no need to call this if you set the MULE_HOME in your environment properties
REM but you must also define MULE_LIB for the example (see below)
REM or specify the config as a file: URI (see README.txt)
if "%MULE_HOME%" == "" SET MULE_HOME=%~dp0..\..
if "%MULE_BASE%" == "" SET MULE_BASE=%MULE_HOME%

REM This extends the classpath to include the configuration directory
REM Any changes to the files in .\conf will take precedence over those deployed to %MULE_HOME%\lib\user
SET MULE_LIB=.\conf

call "%MULE_BASE%\bin\mule.bat" -config myhello-config.xml

    然後雙擊這個文件就可以運行MyHello服務了，允許結果截圖如下：


    至此，一個簡單的Mule服務就開發完成了，是不是很簡單啊？接下來一篇文章講解如何編譯和導入Mule自帶的例子到elicpse工程下。