Java code lib 输出对象所有属性值

    /**
     * Converts an object to a string representation that lists all fields;
     * @param obj an object
     * @return a string with the object's class name and all filed names and values
     */
    public String toString(Object obj) {
        if(obj ==null) return "null";
        if(visited.contains(obj)) return "...";
        visited.add(obj);
        Class cl=obj.getClass();
        //String
        if(cl==String.class) return (String) obj;
        //Array
        if(cl.isArray()){
            String r=cl.getComponentType()+"[]{";
            for(int i=0;i< Array.getLength(obj);i++){
                if(i>0) r+=",";
                Object val=Array.get(obj,i);
                if(cl.getComponentType().isPrimitive()) r+=val;
                else r+=toString(val);
            }
            return r+"}";
        }

        String r=cl.getName();
        //inspect the fields of this class and all superclass
        do{
            r+="[";
            Field[] fields=cl.getDeclaredFields();
            AccessibleObject.setAccessible(fields,true);
            //get the names and values of all fields
            for(Field f:fields){
                if(!Modifier.isStatic(f.getModifiers()))
                {
                    if(!r.endsWith("["))r+=",";
                    r+=f.getName()+"=";
                    try
                    {
                        Class t=f.getType();
                        Object val=f.get(obj);
                        if(t.isPrimitive()) r+=val;
                        else  r+=toString(val);
                    }
                    catch (Exception e){
                        e.printStackTrace();
                    }
                }
            }
            r+="]";
            cl=cl.getSuperclass();
        }
        while (cl!=null);
        return r;
    }