Java 随笔记录

1. java对象转json

Message msg = generateMessage();
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(msg);

2. json转java对象

ObjectMapper mapper = new ObjectMapper();

mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
mapper.setVisibilityChecker(VisibilityChecker.Std.defaultInstance().withFieldVisibility(JsonAutoDetect.Visibility.ANY))

Message message = mapper.readValue(reqMsg.getBytes("GBK"), Message.class);

3. String与xml格式的对象互相转换

@XmlRootElement(name = "Msg")
@lombok.Data

public static String marshal(Object object, String encoding, String schemaLocation) throws JAXBException, UnsupportedEncodingException {
    JAXBContext context = JAXBContext.newInstance(new Class[]{object.getClass()});
    Marshaller marshaller = context.createMarshaller();
    marshaller.setProperty("jaxb.encoding", encoding);
    marshaller.setProperty("jaxb.formatted.output", Boolean.valueOf(true));
    if(schemaLocation != null && !"".equals(schemaLocation)) {
        marshaller.setProperty("jaxb.schemaLocation", schemaLocation);
    }

    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    marshaller.marshal(object, outputStream);
    return outputStream.toString("UTF-8");
}

public static <T> T unMarshal(Class cls, String xmlStr, String encoding) throws JAXBException {
    JAXBContext context = JAXBContext.newInstance(new Class[]{cls});
    Unmarshaller unMarshaller = context.createUnmarshaller();
    ByteArrayInputStream inputStream = new ByteArrayInputStream(xmlStr.getBytes(Charset.forName(encoding)));
    return unMarshaller.unmarshal(inputStream);
}

4.