Mulesoft Java Transformer

Question

我不知道如何在Mulesoft中使用Java Transformer。我想基本上采用String并将其转换为URL，但我无法弄清楚如何使用Java方法或任何东西。

我做错了什么？我怎样才能调用我的方法，或者使我的方法与我想要的值一起使用？

错误：

  

org.mule.module.launcher.DeploymentInitException：   IllegalStateException：无法转换类型的值   [transformers.StringTransformer]到必需的类型   [org.mule.api.processor.MessageProcessor]属性   'messageProcessors [4]'：没有匹配的编辑器或转换策略   结果

     

引起：org.mule.api.config.ConfigurationException：创建错误   名为'streamMigrateAccountToCustomer'的bean：初始化   豆子失败了;嵌套异常是   org.springframework.beans.ConversionNotSupportedException：失败   将[java.util.ArrayList]类型的属性值转换为所需类型   [java.util.List]属性'messageProcessors';嵌套异常是   java.lang.IllegalStateException：无法转换类型的值   [transformers.StringTransformer]到必需的类型   [org.mule.api.processor.MessageProcessor]属性   'messageProcessors [4]'：没有匹配的编辑器或转换策略   找到（org.mule.api.lifecycle.InitialisationException）   （org.mule.api.config.ConfigurationException）

StringTransformer

@ContainsTransformerMethods
public class StringTransformer
{
    public String website;

  public String getWebsite() {
      return website;
  }

  public void setWebsite(String website) {
      this.website = website;
  }

@Transformer
  public String stringToURL(String string) throws MalformedURLException
  {
      return new java.net.URL(string).toString();
  }
}

XML

<custom-transformer class="transformers.StringTransformer" doc:name="Java">
    <spring:property name="website" value="#[payload.Website]"/>
</custom-transformer>

输入JAVA TRANSFORMER

%dw 1.0
%output application/java
---
{
    Id: payload.Id,
    Name: payload.Name,
    Active_CMRR__c: payload.Active_CMRR__c,
    BillingStreet: payload.BillingStreet,
    BillingCity: payload.BillingCity,
    BillingState: payload.BillingState,
    BillingPostalCode: payload.BillingPostalCode,
    BillingCountry: payload.BillingCountry,
    OwnerId: payload.OwnerId,
    Website: payload.Website,
    Contract_End_Date__c: payload.Contract_End_Date__c,
    NS_Account_Number__c: payload.NS_Account_Number__c,
    Phone: payload.Phone,
    Subscription_Start_Date__c: payload.Subscription_Start_Date__c,
    NS_Account_Name__c: payload.NS_Account_Name__c,
    type: payload.type,
    Owner: {
        NS_Account_Manager_Id__c: payload.Owner.NS_Account_Manager_Id__c,
        Id: payload.Owner.Id,
        type: payload.Owner.type,
        Name: payload.Owner.Name
    }
}

Answer 1

对于简单的字符串操作，我更喜欢使用简单的MEL表达式，这是创建新变量的一个例子。

<set-variable variableName="website" value="#[new java.net.URL(payload.Website).toString()]" doc:name="Variable"/>

要在MuleMessage上执行java transformations，我更喜欢扩展AbstractMessageTransformer类。

public class ExampleAbstractMessageTransformer extends AbstractMessageTransformer {

@Override
public Object transformMessage(MuleMessage message, String outputEncoding) throws TransformerException  {
    // TODO Auto-generated method stub
    HashMap<String, String> payload = new HashMap<String, String>();
    String websiteUrl = new String();

    //Grab Payload
    payload = (HashMap<String, String>) message.getPayload();
    try {
        websiteUrl = stringToURL(payload.get("Website").toString());
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }


    message.setInvocationProperty("websiteUrl", websiteUrl);
    return message;
}

public String stringToURL(String string) throws MalformedURLException {
    return new java.net.URL(string).toString();
}
}

在Mulesoft流程中实施。假设java代码打包为com.stackoverflow.transformers使用＆＃34; custom-transformer＆＃34;零件。

<custom-transformer class="com.stackoverflow.transformers.ExampleAbstractMessageTransformer" doc:name="Java" />

Answer 2

您可以使用invoke组件来调用java方法。检查https://docs.mulesoft.com/mule-user-guide/v/3.7/invoke-component-reference

Answer 3

@ContainsTransformerMethods // since Mule 3.0.1 
    public class MyTransformers {  
    @Transformer  
    public URL stringToURL(String string) {  
       return new java.net.URL(string); 
    }
    @Transformer 
    public List<URL> stringsToURLs(String string) {    
       List<URL urls = new ArrayList<URL>();   
       for (StringTokenizer tokenizer = new StringTokenizer(string); tokenizer.hasMoreTokens();) {       
          urls.add(new URL(tokenizer.nextToken()));
       }   
       return urls;
    }
 }