判断不为空再拼接 Object user = mapgetuser; Object title = mapgettitle; Object time = mapgettime; Object data = mapgetdata; Object version = mapgetversion; StringBuild

String result = "";

if (user != null) { stringBuilder.append(user.toString()); }

if (title != null) { stringBuilder.append(title.toString()); }

if (time != null) { stringBuilder.append(time.toString()); }

if (data != null) { stringBuilder.append(data.toString()); }

if (version != null) { stringBuilder.append(version.toString()); }

result = stringBuilder.toString();