Mule json to java组件

Question

我有这个json对象

data = {    
    "amount": "70",
    "cardNumber": "4222222222222",
    "expiryDate": "1215",
    "currency": "Currency.ISK.alpha" 
}

我想把这个json对象改成java组件，用java调用各种java函数。我在把这个json对象转换成java组件时遇到了问题。我已经创建了以下两个java类。

@JsonAutoDetect
public class Handpoint {
private String amount;
private String cardNumber;
private String expireDate;
private String currency;

public String getAmount() { return amount; }
public void setAmount(String amount) { this.amount = amount; }

public String getCardNumber() { return cardNumber; }
public void setCardNumber(String cardNumber) { this.cardNumber = cardNumber; }

public String getExpireDate() { return expireDate; }
public void setExpireDate(String expireDate) { this.expireDate = expireDate; }

public String getCurrency() { return currency; }
public void setCurrency(String currency) { this.currency = currency; }

}

和

public class HandpointService {
public void ProcessPerson(@Payload Handpoint handpoint) {
    String cardNumber = handpoint.getCardNumber();
    cardNumber.toString();
}
}

配置文件很简单

<flow name="json_to_java_componentFlow1" doc:name="json_to_java_componentFlow1">
    <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081"     path="json" doc:name="HTTP"/>
    <component class="is.threesixtyfive.example.HandpointService" doc:name="Java"/>
</flow>

当我运行此命令时，我得到以下错误：

Message               : Failed to transform from "json" to 

"is.threesixtyfive.example.Handpoint"
Code                  : MULE_ERROR-109
--------------------------------------------------------------------------------
Exception stack is:
1. Unrecognized field "expiryDate" (Class is.threesixtyfive.example.Handpoint), not marked as ignorable
 at [Source: java.io.InputStreamReader@26940a2e; line: 1, column: 98] (through reference chain: is.threesixtyfive.example.Handpoint["expiryDate"]) (org.codehaus.jackson.map.exc.UnrecognizedPropertyException)
  org.codehaus.jackson.map.exc.UnrecognizedPropertyException:53 (null)
2. Failed to transform from "json" to "is.threesixtyfive.example.Handpoint" (org.mule.api.transformer.TransformerException)
  org.mule.module.json.transformers.JsonToObject:136 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/transformer/TransformerException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "expiryDate" (Class is.threesixtyfive.example.Handpoint), not marked as ignorable
 at [Source: java.io.InputStreamReader@26940a2e; line: 1, column: 98] (through reference chain: is.threesixtyfive.example.Handpoint["expiryDate"])
    at org.codehaus.jackson.map.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:53)
    at org.codehaus.jackson.map.deser.StdDeserializationContext.unknownFieldException(StdDeserializationContext.java:267)
    at org.codehaus.jackson.map.deser.std.StdDeserializer.reportUnknownProperty(StdDeserializer.java:673)
    + 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************

任何帮助都将不胜感激

Answer 1

问题来自于这样一个事实：

• 入站HTTP端点为request-response，因此它将向调用者返回响应，
• 组件方法没有返回值。

Mule使用组件之后的当前消息有效负载-可能是使用的输入流-为入站端点创建响应，但失败了。

如果我添加：

<set-payload value="foo" />

在组件之后，错误就会清除( HTTP客户端收到"foo")。

Answer 2

JSON和POJO的字段名不同。

在JSON中：expiryDate

在POJO中：expireDate

Answer 3

我认为这样做的一种方法是首先处理转换部分，使用transformer JSON to Object并加载映射引用，然后使用Java组件并加载HandpointService类并使其可调用，这样您就可以拥有类的入口点。