java List转换为字符串并加入分隔符的一些方法总结

 // 方法一：
 public String listToString(List list, char separator) {
     StringBuilder sb = new StringBuilder();
     for (int i = 0; i < list.size(); i++) {
         sb.append(list.get(i)).append(separator);
     }
     return list.isEmpty()?"":sb.toString().substring(0, sb.toString().length() - 1);
 }

 // 方法二：
 public String listToString2(List list, char separator) {
     StringBuilder sb = new StringBuilder();
     for (int i = 0; i < list.size(); i++) {
         if (i == list.size() - 1) {
             sb.append(list.get(i));
         } else {
             sb.append(list.get(i));
             sb.append(separator);
         }
     }
     return sb.toString();
 }

 // 方法三：
 public String listToString3(List list, char separator) {
     StringBuilder sb = new StringBuilder();
     for (int i = 0; i < list.size(); i++) {
         sb.append(list.get(i));
         if (i < list.size() - 1) {
             sb.append(separator);
         }
     }
     return sb.toString();
 }

 // 方法四：
 public class Separator {
     private String next = "";
     private String separator;

     public Separator(String separator) {
         this.separator = separator;
     }

     public String get() {
         String result = next;
         next = separator;
         return result;
     }
 }

 public String listToString4(List list, Separator separator) {
     StringBuilder sb = new StringBuilder();
     for (String s : list) {
         if (s != null && !"".equals(s)) {
             sb.append(separator.get()).append(s);
         }
     }
     return sb.toString();
 }

 // 方法五：
 public String listToString5(List list, char separator) {
     return org.apache.commons.lang.StringUtils.join(list.toArray(),separator);
 }

第五种方法使用较多，比较方便

原文转自http://blog.csdn.net/mingliangniwo/article/details/45195997