Java 输出对象为字符串

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();}