Json工具类，,自己写的Json工具类，

Json工具类，,自己写的Json工具类，

自己写的Json工具类，不知道有没有哪里需要完善。

[Java]代码

package org.hwork.utils;import java.lang.annotation.Annotation;import java.lang.reflect.Field;import java.util.Date;import java.util.List;import java.util.Map;import org.hwork.annotation.Json;/** * Json工具类，用户List,Map与Json的转换 * @author heng.ai * */public class JsonUtils {    private static String toJson(Object obj,Class<? extends Annotation> annotationClass , boolean all) throws IllegalArgumentException, IllegalAccessException{        if(obj == null)             return "null";        if(obj instanceof String)             return "\"" + (String)obj + "\"";        if(obj instanceof Integer)             return ((Integer)obj).toString();        if(obj instanceof Double)            return ((Double)obj).toString();        if(obj instanceof Float)            return ((Float)obj).toString();        if(obj instanceof Short)            return ((Short)obj).toString();        if(obj instanceof Long)            return ((Long)obj).toString();        if(obj instanceof Byte)            return ((Byte)obj).toString();        if(obj instanceof Character)            return "\"" + ((Character)obj).toString() + "\"";        if(obj instanceof Boolean)            return ((Boolean)obj).toString();        if(obj instanceof Date)            return "\"" + ((Date)obj).getTime() + "\"";        StringBuffer json = new StringBuffer();         json.append("{");        Class<?> clazz = obj.getClass();        Field[] fields = clazz.getDeclaredFields();        for(Field field : fields){            field.setAccessible(true);            if(all){                json.append("\"").append(field.getName()).append("\"").append(":").append(toJson(field.get(obj), annotationClass, all)).append(",");                continue;            }            if(field.isAnnotationPresent(annotationClass)){                json.append("\"").append(field.getName()).append("\"").append(":").append(toJson(field.get(obj), annotationClass, all)).append(",");            }        }        if(json.lastIndexOf(",") != -1){            json.deleteCharAt(json.lastIndexOf(","));        }        json.append("}");        return json.toString();    }    public static String toJson(Object obj) throws IllegalArgumentException, IllegalAccessException{        return toJson(obj, Json.class, true);    }    public static String toJson(Object obj, boolean isAll) throws IllegalArgumentException, IllegalAccessException{        return toJson(obj, Json.class, isAll);    }    /**     * 将对象转换为json数据     * annotationclass为自定义annotation，可以自己定义要列入json的字段     * @param obj     * @param annotationClass     * @return     * @throws IllegalAccessException      * @throws IllegalArgumentException      */    public static String toJson(Object obj, Class<? extends Annotation> annotationClass) throws IllegalArgumentException, IllegalAccessException{        return toJson(obj, annotationClass, false);    }    public static String toJson(List<?> list) throws IllegalArgumentException, IllegalAccessException{        return toJson(list, true);    }    public static String toJson(List<?> list, boolean isAll) throws IllegalArgumentException, IllegalAccessException{        StringBuffer json = new StringBuffer();         json.append("[");        for (Object o : list) {            json.append(toJson(o, isAll)).append(",");        }        if(json.lastIndexOf(",") != -1){            json.deleteCharAt(json.lastIndexOf(","));        }        json.append("]");        return json.toString();    }    public static String toJson(Map<String,?> map, boolean isAll) throws IllegalArgumentException, IllegalAccessException{        StringBuffer json = new StringBuffer();         json.append("[");        for (Map.Entry<String, ?> entry : map.entrySet()) {            json.append("{\"").append(entry.getKey()).append("\"").append(":").append(toJson(entry.getValue(), isAll)).append("},");        }        if(json.lastIndexOf(",") != -1){            json.deleteCharAt(json.lastIndexOf(","));        }        json.append("]");        return json.toString();    }    public static String toJson(Map<String,?> map) throws IllegalArgumentException, IllegalAccessException{        return toJson(map, true);    }    public static String toJson(Object[] objs, boolean isAll) throws IllegalArgumentException, IllegalAccessException{        StringBuffer json = new StringBuffer();        json.append("[");        for (Object obj : objs) {            json.append(toJson(obj, isAll)).append(",");        }        if(json.lastIndexOf(",") != -1){            json.deleteCharAt(json.lastIndexOf(","));        }        json.append("]");        return json.toString();    }    public static String toJson(Object[] objs) throws IllegalArgumentException, IllegalAccessException{        return toJson(objs, true);    }}

[Java]代码

package org.hwork.annotation;import java.lang.annotation.Documented;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Retention(RetentionPolicy.RUNTIME)@Documented@Target(ElementType.FIELD)public @interface Json {}