java比较两个字符串的相似度

package com.keertech.mwb.util;

import java.text.NumberFormat;

import java.util.Locale;

/**

 * 比较两个字符串的相似度

 */

public class Similarity {

public static void main(String[] args) {

String strA = "我是湖南人dfgh";

String strB = "我是湖南人";

double result=SimilarDegree(strA, strB);

if(result>=0.7){

System.out.println("相似度很高！" +similarityResult(result)+result);

}else{

System.out.println("相似度不高"+similarityResult(result)+result);

}

System.out.println();

}

/**

 * 相似度转百分比

 */

public static String similarityResult(double resule){

return  NumberFormat.getPercentInstance(new Locale( "en ", "US ")).format(resule);

}

/**

 * 相似度比较

 * @param strA

 * @param strB

 * @return

 */

public static double SimilarDegree(String strA, String strB){

String newStrA = removeSign(strA);

String newStrB = removeSign(strB);

int temp = Math.max(newStrA.length(), newStrB.length());

int temp2 = longestCommonSubstring(newStrA, newStrB).length();

return temp2 * 1.0 / temp;

}

private static String removeSign(String str) {

StringBuffer sb = new StringBuffer();

for (char item : str.toCharArray())

if (charReg(item)){

//System.out.println("--"+item);

sb.append(item);

}

return sb.toString();

}

private static boolean charReg(char charValue) {

return (charValue >= 0x4E00 && charValue <= 0X9FA5)

|| (charValue >= 'a' && charValue <= 'z')

|| (charValue >= 'A' && charValue <= 'Z')

|| (charValue >= '0' && charValue <= '9');

}

private static String longestCommonSubstring(String strA, String strB) {

char[] chars_strA = strA.toCharArray();

char[] chars_strB = strB.toCharArray();

int m = chars_strA.length;

int n = chars_strB.length;

int[][] matrix = new int[m + 1][n + 1];

for (int i = 1; i <= m; i++) {

for (int j = 1; j <= n; j++) {

if (chars_strA[i - 1] == chars_strB[j - 1])

matrix[i][j] = matrix[i - 1][j - 1] + 1;

else

matrix[i][j] = Math.max(matrix[i][j - 1], matrix[i - 1][j]);

}

}

char[] result = new char[matrix

[n]];

int currentIndex = result.length - 1;

while (matrix

[n] != 0) {

if (matrix

[n] == matrix

[n - 1])

n--;

else if (matrix

[n] == matrix[m - 1][n])

m--;

else {

result[currentIndex] = chars_strA[m - 1];

currentIndex--;

n--;

m--;

}

}

return new String(result);

}

}