Java 输出对象为字符串 工具类

　　

public static String reflectionToString(Object o){
    if(o == null) return StringUtils.EMPTY;
    StringBuilder toStr = new StringBuilder();
    if(o instanceof Collection){
        Iterator it = ((Collection) o).iterator();
        while (it.hasNext()){
            toStr.append(reflectionToString(it.next()));
            toStr.append("\n");
        }
    }else if(o instanceof Map){
        Iterator<Map.Entry> mit = ((Map) o).entrySet().iterator();
        while (mit.hasNext()){
            Map.Entry entry = mit.next();
            String kv = entry.getKey() + ": " + reflectionToString(entry.getValue());
            toStr.append(kv);
            toStr.append(" ");
        }
    } else if(o instanceof Object[]){
        for (Object temp: (Object[])o){
            toStr.append(reflectionToString(temp));
        }
    }else if(o instanceof String){
        toStr.append(o);
    } else {
        toStr.append(ToStringBuilder.reflectionToString(o, ToStringStyle.SHORT_PREFIX_STYLE));
    }
    return toStr.toString();
}