package com.utils;
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public class CompareString {
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private int compare(String str, String target) {
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int d[][]; // 矩阵
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int n = str.length();
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int m = target.length();
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int i; // 遍历str的
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int j; // 遍历target的
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char ch1; // str的
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char ch2; // target的
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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
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if (n == 0) { return m; }
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if (m == 0) { return n; }
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d = new int[n + 1][m + 1];
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for (i = 0; i <= n; i++) { // 初始化第一列
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d[i][0] = i;
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}
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for (j = 0; j <= m; j++) { // 初始化第一行
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d[0][j] = j;
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}
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for (i = 1; i <= n; i++) { // 遍历str
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ch1 = str.charAt(i - 1);
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// 去匹配target
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for (j = 1; j <= m; j++) {
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ch2 = target.charAt(j - 1);
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if (ch1 == ch2 || ch1 == ch2+32 || ch1+32 == ch2) {
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temp = 0;
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} else {
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temp = 1;
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}
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// 左边+1,上边+1, 左上角+temp取最小
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d[i][j] = min(d[i - 1][j] + 1, d[i][j - 1] + 1, d[i - 1][j - 1] + temp);
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}
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}
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return d[n][m];
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}
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private int min(int one, int two, int three)
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{
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return (one = one < two ? one : two) < three ? one : three;
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}
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/**
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* 获取两字符串的相似度
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*/
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public float getSimilarityRatio(String str, String target) {
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str = str.replace(" ", "");target = target.replace(" ", "");
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//去除空白字符、换行、标点符号
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String regex = "[\\pP\\p{Punct}\\s]";
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return 1 - (float) compare(str.replaceAll(regex, ""), target.replaceAll(regex, "")) / Math.max(str.length(), target.length());
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}
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public static void main(String[] args) {
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String str= "220nF/25V";
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String target = "5.1Ω±1%,1/16W, 0402";
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CompareString lt = new CompareString();
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System.out.println("similarityRatio=" + lt.getSimilarityRatio(str, target));
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}
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}
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