Jackson 学习笔记 XML转JSON

Posted 2021-06-29 笑虾

Jackson 学习笔记 XML转JSON

• 依赖
• 示例
• XML > JavaBean > Json
• XML > JsonNode

利用jackson实现 xml 2 json。

依赖

SpringBoot 项目自带了 jackson-databind 省略。只需要添加jackson-dataformat-xml即可。另外version也可以省掉。

     <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-databind</artifactId>
         <version>2.12.3</version>
     </dependency>
	<dependency>
       <groupId>com.fasterxml.jackson.dataformat</groupId>
       <artifactId>jackson-dataformat-xml</artifactId>
       <version>2.12.3</version>
   </dependency>

示例

XML > JavaBean > Json

常规思路，先将XML转成 Java对象，再转为 Json

    @Test
    void xml2json1() throws JsonProcessingException {
        XmlMapper xmlMapper = new XmlMapper();               
        String xml = "<Hero><name>张三</name><age>18</age></Hero>";
        Hero hero = xmlMapper.readValue(xml, Hero.class);
        
        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(hero);
        System.out.println(json);
    }

XML > JsonNode

直接将 XML字符串转为 Json对象。省掉中间的Java对象。

    @Test
    void xml2json2() throws IOException {
        XmlMapper xmlMapper = new XmlMapper();
        String xml = "<Hero><name>张三</name><age>18</age></Hero>";
        JsonNode jsonNode = xmlMapper.readTree(xml.getBytes());

        System.out.println(jsonNode.get("name").asText("无名"));
        System.out.println(jsonNode.get("age").asInt(99));
        System.out.println(jsonNode.get("title"));        
    }