查询windows或者linux上 支持的所有字体

最近在搞画图啥的 简单记录下 查询所有支持的字体

public static void main(String[] args) throws Exception {

      
        GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment();
        String[] fontName = environment.getAvailableFontFamilyNames();
        for (int i = 0; i < fontName.length; i++) {
            System.out.println(fontName[i]);
        }
        // 对象转json
        String in = JsonUtils.toJSONString(fonts);
    }

对象转json 通用方法啥的 也 记录下

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
import com.taiden.common.constant.LocalDateTimeConstant;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections.MapUtils;

import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;

@Slf4j
public class JsonUtils {

    // 加载速度太慢了，放在静态代码块中
    // private static final ObjectMapper mapper = new ObjectMapper();
    private static ObjectMapper mapper;

    /**
     * 设置一些通用的属性
     */
    static {
        mapper = new ObjectMapper();
        // 如果json中有新增的字段并且是实体类类中不存在的，不报错
        // mapper.configure(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES, false);
        // 如果存在未知属性，则忽略不报错
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        // 允许key没有双引号
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
        // 允许key有单引号
        mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        // 允许整数以0开头
        mapper.configure(JsonParser.Feature.ALLOW_NUMERIC_LEADING_ZEROS, true);
        // 允许字符串中存在回车换行控制符
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);

        mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        mapper.disable(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE);
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(LocalDateTimeConstant.defaultDateTimeFormatter));
        javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(LocalDateTimeConstant.defaultDateFormatter));
        javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(LocalDateTimeConstant.defaultTimeFormatter));
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(LocalDateTimeConstant.defaultDateTimeFormatter));
        javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(LocalDateTimeConstant.defaultDateFormatter));
        javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(LocalDateTimeConstant.defaultTimeFormatter));
        mapper.registerModule(javaTimeModule);
    }

    public static String toJSONString(Object obj) {
        return obj != null ? toJSONString(obj, () -> "", false) : "";
    }

    public static String toFormatJSONString(Object obj) {
        return obj != null ? toJSONString(obj, () -> "", true) : "";
    }

    public static String toJSONString(Object obj, Supplier<String> defaultSupplier, boolean format) {
        try {
            if (obj == null) {
                return defaultSupplier.get();
            }
            if (obj instanceof String) {
                return obj.toString();
            }
            if (obj instanceof Number) {
                return obj.toString();
            }
            if (format) {
                return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
            }
            return mapper.writeValueAsString(obj);
        } catch (Throwable e) {
            log.error(String.format("toJSONString %s", obj != null ? obj.toString() : "null"), e);
        }
        return defaultSupplier.get();
    }

    /**
     * 将对象转换为JSON纯文本
     */
    public static String toJSONPlainString(Object obj) {
        String replaceJson = toJSONString(obj).replaceAll("\"", "\\\\\"");
        return "\"" + replaceJson + "\"";
    }

    public static <T> T toJavaObject(String value, Class<T> tClass) {
        return StringUtils.isNotBlank(value) ? toJavaObject(value, tClass, () -> null) : null;
    }

    public static <T> T toJavaObject(Object obj, Class<T> tClass) {
        return obj != null ? toJavaObject(toJSONString(obj), tClass, () -> null) : null;
    }

    public static <T> T toJavaObject(InputStream stream, Class<T> tClass) {
        try {
            return mapper.readValue(stream, tClass);
        } catch (Throwable e) {
            log.error(String.format("toJavaObject exception: \n %s\n %s", stream, tClass), e);
        }
        return null;
    }

    public static <T> T toJavaObject(String value, Class<T> tClass, Supplier<T> defaultSupplier) {
        try {
            if (StringUtils.isBlank(value)) {
                return defaultSupplier.get();
            }
            return mapper.readValue(value, tClass);
        } catch (Throwable e) {
            log.error(String.format("toJavaObject exception: \n %s\n %s", value, tClass), e);
        }
        return defaultSupplier.get();
    }

    public static <T> List<T> toJavaObjectList(String value, Class<T> tClass) {
        return StringUtils.isNotBlank(value) ? toJavaObjectList(value, tClass, () -> null) : null;
    }

    public static <T> List<T> toJavaObjectList(Object obj, Class<T> tClass) {
        return obj != null ? toJavaObjectList(toJSONString(obj), tClass, () -> null) : null;
    }

    public static <T> List<T> toJavaObjectList(String value, Class<T> tClass, Supplier<List<T>> defaultSupplier) {
        try {
            if (StringUtils.isBlank(value)) {
                return defaultSupplier.get();
            }
            JavaType javaType = mapper.getTypeFactory().constructParametricType(List.class, tClass);
            return mapper.readValue(value, javaType);
        } catch (Throwable e) {
            log.error(String.format("toJavaObjectList exception \n%s\n%s", value, tClass), e);
        }
        return defaultSupplier.get();
    }

    // 简单地直接用json复制或者转换(Cloneable)
    public static <T> T jsonCopy(Object obj, Class<T> tClass) {
        return obj != null ? toJavaObject(toJSONString(obj), tClass) : null;
    }

    public static Map<String, Object> toMap(String value) {
        return StringUtils.isNotBlank(value) ? toMap(value, () -> null) : null;
    }

    public static Map<String, Object> toMap(Object value) {
        return value != null ? toMap(value, () -> null) : null;
    }

    public static Map<String, Object> toMap(Object value, Supplier<Map<String, Object>> defaultSupplier) {
        if (value == null) {
            return defaultSupplier.get();
        }
        try {
            if (value instanceof Map) {
                return (Map<String, Object>) value;
            }
        } catch (Exception e) {
            log.info("fail to convert" + toJSONString(value), e);
        }
        return toMap(toJSONString(value), defaultSupplier);
    }

    public static Map<String, Object> toMap(String value, Supplier<Map<String, Object>> defaultSupplier) {
        if (StringUtils.isBlank(value)) {
            return defaultSupplier.get();
        }
        try {
            return toJavaObject(value, LinkedHashMap.class);
        } catch (Exception e) {
            log.error(String.format("toMap exception\n%s", value), e);
        }
        return defaultSupplier.get();
    }


    public static List<Object> toList(String value) {
        return StringUtils.isNotBlank(value) ? toList(value, () -> null) : null;
    }

    public static List<Object> toList(Object value) {
        return value != null ? toList(value, () -> null) : null;
    }

    public static List<Object> toList(String value, Supplier<List<Object>> defaultSuppler) {
        if (StringUtils.isBlank(value)) {
            return defaultSuppler.get();
        }
        try {
            return toJavaObject(value, List.class);
        } catch (Exception e) {
            log.error("toList exception\n" + value, e);
        }
        return defaultSuppler.get();
    }

    public static List<Object> toList(Object value, Supplier<List<Object>> defaultSuppler) {
        if (value == null) {
            return defaultSuppler.get();
        }
        if (value instanceof List) {
            return (List<Object>) value;
        }
        return toList(toJSONString(value), defaultSuppler);
    }

    public static long getLong(Map<String, Object> map, String key) {
        if (MapUtils.isEmpty(map)) {
            return 0L;
        }
        String valueStr = String.valueOf(map.get(key));
        if (StringUtils.isBlank(valueStr) || !StringUtils.isNumeric(valueStr)) {
            return 0L;
        }
        return Long.valueOf(valueStr);
    }

    public static int getInt(Map<String, Object> map, String key) {
        if (MapUtils.isEmpty(map)) {
            return 0;
        }
        String valueStr = String.valueOf(map.get(key));
        if (StringUtils.isBlank(valueStr) || !StringUtils.isNumeric(valueStr)) {
            return 0;
        }
        return Integer.valueOf(valueStr);
    }

}