java 骆驼路线：将 xml 读入 pojo 并将其写回 xml 文件
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camel route: read xml into pojo and write it back into xml file
提问by David
I was looging for some time now, but since a lot of configuration files are in xml it's hard to find some answers to my question.
我已经找了一段时间了，但是由于很多配置文件都在 xml 中，因此很难找到我的问题的答案。
What would I like to do? Using a caml route I want to read in an xml file and put it into a POJO. Here I want to analyze it. At the end I want to write a different xml file (POJO) as an answer into an out folder.
我想做什么？使用caml路由我想读入一个xml文件并将其放入POJO中。这里我想分析一下。最后，我想将不同的 xml 文件 (POJO) 作为答案写入 out 文件夹。
My problem is, that I don't know how to tell camel to parse the xml file body into my POJO.
我的问题是，我不知道如何告诉骆驼将 xml 文件体解析到我的 POJO 中。
A short example what I did until know:
我在知道之前所做的一个简短示例：
My camel route:
我的骆驼路线：
from("file:data/in")
.marshal().xstream()
.bean(XmlToBeanAndBackBean.class)
.unmarshal().xstream()
.to("file:data/out");
My POJO:
我的POJO：
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class XmlFilePojo {
@XmlAnyAttribute
private String name;
@XmlElement(name = "the_age")
private int theAge;
public void setName(String name) {
this.name = name;
}
}
And my Bean which is used in the camel route:
还有我在骆驼路线中使用的 Bean：
@Component
public class XmlToBeanAndBackBean {
public XmlFilePojo transformXmlObject(XmlFilePojo xmlFilePojo){
XmlFilePojo returnPojo = xmlFilePojo;
returnPojo.setName("merkur");
return returnPojo;
}
}
I think that my error is in the camel route which camel trys to converting the xml file into the XmlFilePojo Object.
我认为我的错误出在骆驼尝试将 xml 文件转换为 XmlFilePojo 对象的骆驼路线中。
When I try to run it I get the following error:
当我尝试运行它时，出现以下错误：
Caused by: org.apache.camel.InvalidPayloadException: No body available of type: XmlFilePojo but has value: [B@659392cd of type: byte[] on: simple.xml. Caused by: No type converter available to convert from type: byte[] to the required type: XmlFilePojo with value [B@659392cd. Exchange[simple.xml]. Caused by: [org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: byte[] to the required type: XmlFilePojo with value [B@659392cd]
引起：org.apache.camel.InvalidPayloadException：没有可用的主体类型：XmlFilePojo 但具有值：[B@659392cd 类型：byte[] on：simple.xml。原因：没有类型转换器可用于从类型：byte[] 转换为所需的类型：XmlFilePojo，值为 [B@659392cd。交换[simple.xml]。引起：[org.apache.camel.NoTypeConversionAvailableException - 没有类型转换器可用于从类型：byte[] 转换为所需的类型：XmlFilePojo with value [B@659392cd]
Since I don't have a byte[] in my file I don't know how to handle this. Hope someone has an answer.
由于我的文件中没有 byte[]，我不知道如何处理。希望有人有答案。
回答by Claus Ibsen
Just add camel-jaxbto the classpath and it can do the automatic xml <--> pojo conversition, when you are using JAXB annotations on your POJOs. Just write your bean code using the POJOs.
camel-jaxb当您在 POJO 上使用 JAXB 注释时，只需添加到类路径，它就可以自动进行 xml <--> pojo 转换。只需使用 POJO 编写您的 bean 代码。
Then the route is simple
然后路线很简单
from("file:data/in")
.bean(XmlToBeanAndBackBean.class)
.to("file:data/out");
回答by Victor Tripeno
You can use unmarshal with json library.
您可以将 unmarshal 与 json 库一起使用。
from("file:data/in")
.unmarshal().json(JsonLibrary.Hymanson, XmlFilePojo.class)
.to("file:data/out");
