字符串按照相似度排序

  1 /**
  2  * 字符串列表按照与某一个字符串的相似度降序排列
  3  *
  4  * @author weihainan.
  5  * @since 0.1 created on 2017/5/11.
  6  */
  7 public class SimilarityUtil {
  8 
  9     private static int compare(String str, String target) {
 10         int d[][];              // 矩阵
 11         int n = str.length();
 12         int m = target.length();
 13         int i;                  // 遍历str的
 14         int j;                  // 遍历target的
 15         char ch1;               // str的
 16         char ch2;               // target的
 17         int temp;               // 记录相同字符,在某个矩阵位置值的增量,不是0就是1
 18         if (n == 0) {
 19             return m;
 20         }
 21         if (m == 0) {
 22             return n;
 23         }
 24         d = new int[n + 1][m + 1];
 25         for (i = 0; i <= n; i++) {                       // 初始化第一列
 26             d[i][0] = i;
 27         }
 28 
 29         for (j = 0; j <= m; j++) {                       // 初始化第一行
 30             d[0][j] = j;
 31         }
 32 
 33         for (i = 1; i <= n; i++) {                       // 遍历str
 34             ch1 = str.charAt(i - 1);
 35             // 去匹配target
 36             for (j = 1; j <= m; j++) {
 37                 ch2 = target.charAt(j - 1);
 38                 if (ch1 == ch2 || ch1 == ch2 + 32 || ch1 + 32 == ch2) {
 39                     temp = 0;
 40                 } else {
 41                     temp = 1;
 42                 }
 43                 // 左边+1,上边+1, 左上角+temp取最小
 44                 d[i][j] = min(d[i - 1][j] + 1, d[i][j - 1] + 1, d[i - 1][j - 1] + temp);
 45             }
 46         }
 47         return d[n][m];
 48     }
 49 
 50     private static int min(int one, int two, int three) {
 51         return (one = one < two ? one : two) < three ? one : three;
 52     }
 53 
 54     /**
 55      * 获取两字符串的相似度
 56      */
 57     public static float getSimilarityRatio(String str, String target) {
 58         return 1 - (float) compare(str, target) / Math.max(str.length(), target.length());
 59     }
 60 
 61 
 62     public static List<String> sortBySimilar(String key, List<String> list) {
 63         if (CollectionUtils.isEmpty(list)) {
 64             return Lists.newArrayList();
 65         }
 66         List<Comp> comps = Lists.newArrayList();
 67         for (String str : list) {
 68             float ratio = getSimilarityRatio(str, key);
 69             comps.add(new Comp(ratio, str));
 70         }
 71         Collections.sort(comps, new Comparator<Comp>() {
 72             public int compare(Comp o1, Comp o2) {
 73                 return (o2.getRatio() < o1.getRatio()) ? -1 : ((o2.getRatio() == o1.getRatio()) ? 0 : 1);
 74             }
 75         });
 76         List<String> res = Lists.newArrayList();
 77         for (Comp comp : comps) {
 78             res.add(comp.getStr());
 79         }
 80         return res;
 81     }
 82 
 83     public static class Comp {
 84         private String str;
 85         private float ratio;
 86 
 87         public Comp(float ratio, String str) {
 88             this.ratio = ratio;
 89             this.str = str;
 90         }
 91 
 92         public float getRatio() {
 93             return ratio;
 94         }
 95 
 96         public void setRatio(float ratio) {
 97             this.ratio = ratio;
 98         }
 99 
100         public String getStr() {
101             return str;
102         }
103 
104         public void setStr(String str) {
105             this.str = str;
106         }
107 
108         @Override
109         public boolean equals(Object o) {
110             if (this == o) return true;
111             if (o == null || getClass() != o.getClass()) return false;
112             Comp comp = (Comp) o;
113             return Float.compare(comp.ratio, ratio) == 0 &&
114                     Objects.equal(str, comp.str);
115         }
116 
117         @Override
118         public int hashCode() {
119             return Objects.hashCode(str, ratio);
120         }
121     }
122 
123     public static void main(String[] args) {
124         System.out.println(sortBySimilar("1234", Lists.newArrayList("1", "1234", "23", "56")));
125     }
126 
127 }

输出:  [1234, 23, 1, 56]

posted @ 2017-05-12 11:23  yweihainan  阅读(1862)  评论(0编辑  收藏  举报