java - Mulesoft Java 转换器

Question

我不知道如何在 Mulesoft 中使用 Java Transformer。我基本上想获取一个字符串并将其转换为 URL，但我不知道如何使用 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，或者使我的方法按照我想要的值使用？

错误:

org.mule.module.launcher.DeploymentInitException: IllegalStateException: Cannot convert value of type [transformers.StringTransformer] to required type [org.mule.api.processor.MessageProcessor] for property 'messageProcessors[4]': no matching editors or conversion strategy found

Caused by: org.mule.api.config.ConfigurationException: Error creating bean with name 'streamMigrateAccountToCustomer': Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type [java.util.ArrayList] to required type [java.util.List] for property 'messageProcessors'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [transformers.StringTransformer] to required type [org.mule.api.processor.MessageProcessor] for property 'messageProcessors[4]': no matching editors or conversion strategy found (org.mule.api.lifecycle.InitialisationException) (org.mule.api.config.ConfigurationException)

字符串转换器

@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>

输入到 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，下面是创建新变量的示例。

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

要做java transformations在 MuleMessage 上，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 流程中实现。假设java代码被打包为com.stackoverflow.transformers，使用“custom-transformer”组件。

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