简单将集合的内容转为字符串

  	　　　　List<String> strList=new ArrayList<String>();
		strList.add("a");
		strList.add("b");
		strList.add("c");
		
		StringBuffer buffer=new StringBuffer();
		for (String str:strList) {
			buffer.append(str+",");
		}
		buffer.deleteCharAt(buffer.lastIndexOf(","));
		System.out.println(buffer.toString());
		String str2=StringUtils.join(strList,",");
		System.out.println(str2);