Question

我使用Jackson api来解析xml对象。

<BESAPI xsi:noNamespaceSchemaLocation="BESAPI.xsd">
    <Employee Resource="https://abc:52311/api/employee/100"/>
    <Employee Resource="https://abc:52311/api/employee/200"/>
    <Employee Resource="https://abc:52311/api/employee/300"/>
    <Employee Resource="https://abc:52311/api/employee/400"/>
</BESAPI>

这是xml记录的结构。我想获得所有资源的列表作为字符串。如何使用Jackson api实现它？

Answer 1

首先，您需要编写一些建模XML内容的Java类。课程获得@JacksonXml... 注释告诉Jackson XML和Java之间的映射。当Java名称与XML名称不同时，这些注释尤为重要。

一个类用于表示<BESAPI>根元素：

@JacksonXmlRootElement(localName = "BESAPI")
public class BESAPI {

    @JacksonXmlProperty(isAttribute = true, localName = "noNamespaceSchemaLocation", namespace = XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI)
    private String noNamespaceSchemaLocation;

    @JacksonXmlProperty(isAttribute = false, localName = "Employee")
    @JacksonXmlElementWrapper(useWrapping = false)
    private List<Employee> employees;

    // public getters and setters (omitted here for brevity)
}

和另一个用于表示<Employee>元素的类

public class Employee {

    @JacksonXmlProperty(isAttribute=true, localName="Resource")
    private String resource;

    // public getters and setters (omitted here for brevity)
}

然后您可以使用Jackson的XmlMapper来阅读XML内容。

XmlMapper xmlMapper = new XmlMapper();
File file = new File("example.xml");
BESAPI besApi = xmlMapper.readValue(file, BESAPI.class);
for (Employee employee : besApi.getEmployees()) {
    System.out.println(employee.getResource());
}

Answer 2

SimpleXml可以做到这一点：

final String data = ...
final SimpleXml simple = new SimpleXml();
final Element element = simple.fromXml(data);
for (final Element employee : element.children) {
    System.out.println(employee.attributes.get("Resource"));
}

将输出：

https://abc:52311/api/employee/100
https://abc:52311/api/employee/200
https://abc:52311/api/employee/300
https://abc:52311/api/employee/400

从Maven Central：

<dependency>
    <groupId>com.github.codemonstur</groupId>
    <artifactId>simplexml</artifactId>
    <version>1.4.0</version>
</dependency>

如何使用Jackson API解析XML？

2 个答案: