Mule ESB

这是一个最简单的mule esb入门实例,其中用了 flow ,endpoint ,transformer,component 这些组件,这些组件的配置也是最简单配置.

情景:

1.在浏览器地址栏输入http://localhost:9090/hello-mule?name=oliver&age=20,会返回"Hello oliver,your age is 10".

1.在浏览器地址栏输入http://localhost:9090/love-mule?name=oliver&age=20,会返回"Love oliver,your age is 10".

配置文件:

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:spring="http://www.springframework.org/schema/beans"
      xmlns:http="http://www.mulesoft.org/schema/mule/http"
      xmlns:vm="http://www.mulesoft.org/schema/mule/vm"
      xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/3.2/mule.xsd
        http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/3.2/mule-http.xsd
        http://www.mulesoft.org/schema/mule/vm http://www.mulesoft.org/schema/mule/vm/3.2/mule-vm.xsd">

     <!-- 将客户端传过来的Http数据转化成Person对象 -->
     <custom-transformer name="HttpDataToPersonTransformer" class="com.mule.transformer.HttpDataToPersonTransformer"/>

     <!-- 将service操作结果用Html语言封装起来 -->
     <custom-transformer name="StringToHtmlTransformer" class="com.mule.transformer.StringToHtmlTransformer"/>

     <!-- 设置相应内容为text/html格式 -->
     <message-properties-transformer name="setHtmlContentType" overwrite="true">
        <add-message-property key="Content-Type" value="text/html" />
        <!-- Tomcat lowercases headers, need to drop this old one too -->
        <delete-message-property key="content-type" />
    </message-properties-transformer>

     <!-- 根据客户端传过来的内容,返回相应的Hello语句 -->
     <flow name="hello">
        <inbound-endpoint address="http://localhost:9090/hello-mule?method=sayHello" exchange-pattern="request-response" >
            <transformer ref="HttpDataToPersonTransformer"/>
            <response>
                <transformer ref="StringToHtmlTransformer"/>
                <transformer ref="setHtmlContentType"/>
            </response>
        </inbound-endpoint>

        <component class="com.mule.component.WelcomService"/>

     </flow>

     <!-- 根绝客户端传过来的内容,返回相应的Love语句 -->
     <flow name="love">
        <inbound-endpoint address="http://localhost:9090/love-mule?method=sayLove" exchange-pattern="request-response" >
            <transformer ref="HttpDataToPersonTransformer"/>
            <response>
                <transformer ref="StringToHtmlTransformer"/>
                <transformer ref="setHtmlContentType"/>
            </response>
        </inbound-endpoint>

        <component class="com.mule.component.WelcomService"/>

     </flow>

</mule>

Transformer:

1.HttpDataToperson 将客户端传过来的http数据转换成component所需要Person类型

package com.mule.transformer;

import org.mule.api.MuleMessage;
import org.mule.api.transformer.TransformerException;
import org.mule.transformer.AbstractMessageTransformer;

import com.mule.domain.Person;

public class HttpDataToPersonTransformer extends AbstractMessageTransformer {

    @Override
    public Object transformMessage(MuleMessage message, String outputEncoding)
            throws TransformerException {
        String name = message.getInboundProperty("name");
        String age = message.getInboundProperty("age");
        if( age == null ) {
            age = "10";
        }

        return new Person(name,Integer.parseInt(age));
    }

}

2.StringToHtmlTransformer 将component处理后返回的string类型数据,封装成html数据

package com.mule.transformer;

import org.mule.api.transformer.TransformerException;
import org.mule.transformer.AbstractTransformer;

import com.mule.util.HtmlTemplateUtil;

public class StringToHtmlTransformer extends AbstractTransformer {

    @Override
    protected Object doTransform(Object src, String enc)
            throws TransformerException {
        String str = (String)src;

        return HtmlTemplateUtil.getSimpleHtml(str);
    }

}

Component:

WelcomService 返回欢迎内容

package com.mule.component;

import com.mule.domain.Person;

public class WelcomService {

    public String sayHello( Person person ){
        return " Hello "+person.getName()+", your age is "+person.getAge();
    }

    public String sayLove( Person person ){
        return " Love you "+person.getName()+", your age is "+person.getAge();
    }

}

Person类 : 

package com.mule.domain;

public class Person {

    private String name;
    private int age;

    public Person(){}

    public Person(String name,int age ){
        this.name = name;
        this.age = 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;
    }

}

HtmlTemplateUtil 工具类:用html语句封转给定的text

package com.mule.util;

public class HtmlTemplateUtil {

    public static String getSimpleHtml( String text ){
        String output = "";

        output += "<html>";
        output += "<head>";
        output += "<meta http-equiv=\"Content-Language\" content=\"en-us\"/>";
        output += "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=windows-1252\"/>";
        output += "<title>Bookstore Administration Console</title>";
        output += "</head>";

        output += "<body link=\"#FFFFFF\" vlink=\"#FFFFFF\" alink=\"#FFFFFF\" bgcolor=\"#990000\" text=\"#FFFFFF\">";
        output += text;
        output += "</body>";

        output += "<br/><a href=\"/bookstore-admin/\">Return to Home Page</a>";
        output += "</html>";

        return output;
    }

}