用于将Array转换为CSV的Java API

Question

假设我有一个int,float,string等数组.是否有任何实用程序API(例如Commons,Guava)会给我一个逗号分隔的字符串？

像这样,

int[] a = {1,2,3,4,5}. 
String s = magicAPI.getCSV(a); // s == "1,2,3,4,5";

Answer 1

对于这个简单的用例,您可以使用逗号简单地连接字符串.如果您使用Java 8:

String csv = String.join(",", yourArray);

否则公地琅具有join()方法:

String csv = org.apache.commons.lang3.StringUtils.join(yourArray, ",");

Answer 2

你提到Google Guava,它有这个Joiner实用程序:

String s = Joiner.on(",").join(a);

Answer 3

我过去使用过OpenCSV 。

StringWriter stringWriter = new StringWriter();
int[] a = {1,2,3,4,5};
String[] b = new String[a.length];
for ( int i = 0; i < a.length; i++) {
    b[i] = a[i];
}
CSVWriter csvWriter = new CSVWriter(stringWriter, ",");
csvWriter.writeNext(b);

但是，对于这样一个简单的示例，您可能只想使用 aStringBuilder和 afor循环