统计一个字符串在另一个字符串中出现的次数（Java mysql)

import java.sql.*;

import java.util.*;

public class Indexof{

public static void main(String[] args) {

try{

Class.forName("com.mysql.jdbc.Driver").newInstance();

String url="jdbc:mysql://localhost:3306/test";

String user="root";

String password="123";

Connection conn= DriverManager.getConnection(url,user,password);

Statement stmt=conn.createStatement();

String sql = "select * from Text";

ResultSet rs=stmt.executeQuery(sql);

while(rs.next()) {

//System.out.println(rs.getString("text"));

String str =rs.getString("text");

if (rs.getString("text").indexOf("你好")!=-1)

{

System.out.println("发现");

String str1 = "你好";

int count = 0;

int start = 0;

while (str.indexOf(str1, start) >= 0 && start < str.length()) {

count++;

start = str.indexOf(str1, start) + str1.length();

}

System.out.println(str1 + "在" + str + "\n\n出现的次数为:" + count);

}



}

}catch(Exception e){

e.printStackTrace();

}

}

}