jackson json序列化实现首字母大写,第二个字母需小写

@Setter
@Getter
@JsonNaming(value = PropertyNamingStrategy.UpperCamelCaseStrategy.class)
public class Student {
    private String bName;
}

@Test
    public void contextLoads() throws IOException {
        Student test = new Student();
        test.setBName("234234");
        String s = objectMapper.writeValueAsString(test);
        Assert.assertEquals("{\"BName\":\"234234\"}", s);
    }

public static String okNameForIsGetter(AnnotatedMethod am, String name,
            boolean stdNaming)
    {
        if (name.startsWith("is")) { // plus, must return a boolean
            Class<?> rt = am.getRawType();
            if (rt == Boolean.class || rt == Boolean.TYPE) {
                return stdNaming
                        ? stdManglePropertyName(name, 2)
                        : legacyManglePropertyName(name, 2);
            }
        }
        return null;
    }

protected static String legacyManglePropertyName(final String basename, final int offset)
    {
        final int end = basename.length();
        if (end == offset) { // empty name, nope
            return null;
        }
        // next check: is the first character upper case? If not, return as is
        char c = basename.charAt(offset);
        char d = Character.toLowerCase(c);
        
        if (c == d) {
            return basename.substring(offset);
        }
        // otherwise, lower case initial chars. Common case first, just one char
        StringBuilder sb = new StringBuilder(end - offset);
        sb.append(d);
        int i = offset+1;
        for (; i < end; ++i) {
            c = basename.charAt(i);
            d = Character.toLowerCase(c);
            if (c == d) {
                sb.append(basename, i, end);
                break;
            }
            sb.append(d);
        }
        return sb.toString();
    }

protected POJOPropertyBuilder _property(Map<String, POJOPropertyBuilder> props,
            String implName)
    {
        POJOPropertyBuilder prop = props.get(implName);
        if (prop == null) {
            prop = new POJOPropertyBuilder(_config, _annotationIntrospector, _forSerialization,
                    PropertyName.construct(implName));
            props.put(implName, prop);
        }
        return prop;
    }

protected void _removeUnwantedProperties(Map<String, POJOPropertyBuilder> props)
    {
        Iterator<POJOPropertyBuilder> it = props.values().iterator();
        while (it.hasNext()) {
            POJOPropertyBuilder prop = it.next();
            // First: if nothing visible, just remove altogether
            if (!prop.anyVisible()) {
                it.remove();
                continue;
            }
            // Otherwise, check ignorals
            if (prop.anyIgnorals()) {
                // first: if one or more ignorals, and no explicit markers, remove the whole thing
                if (!prop.isExplicitlyIncluded()) {
                    it.remove();
                    _collectIgnorals(prop.getName());
                    continue;
                }
                // otherwise just remove ones marked to be ignored
                prop.removeIgnored();
                if (!prop.couldDeserialize()) {
                    _collectIgnorals(prop.getName());
                }
            }
        }
    }

@Setter
@Getter
@JsonNaming(value = PropertyNamingStrategy.UpperCamelCaseStrategy.class)
public class Student {
    @JsonProperty("BName")
    private String bName;
}

@Test
    public void contextLoads() throws IOException {
        Student test = new Student();
        test.setBName("234234");
        objectMapper.configure(MapperFeature.USE_STD_BEAN_NAMING, true);
        String s = objectMapper.writeValueAsString(test);
        Assert.assertEquals("{\"BName\":\"234234\"}", s);
    }

@Test
    public void contextLoads() throws IOException {
        Student test = new Student();
        test.setBName("234234");
        //objectMapper.configure(MapperFeature.USE_STD_BEAN_NAMING, true);
        objectMapper.setPropertyNamingStrategy(new PropertyNamingStrategy() {
            private static final long serialVersionUID = 1L;
            // 反序列化时调用
            @Override
            public String nameForSetterMethod(MapperConfig<?> config,
                                              AnnotatedMethod method, String defaultName) {
                return method.getName().substring(3);
            }
            // 序列化时调用
            @Override
            public String nameForGetterMethod(MapperConfig<?> config,
                                              AnnotatedMethod method, String defaultName) {
                return method.getName().substring(3);
            }
        });
        String s = objectMapper.writeValueAsString(test);
        Assert.assertEquals("{\"BName\":\"2342344\"}", s);
    }