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在实际项目中，数据库有可能会出现非法字符，其原因有多种，如下提供一种非法字符的检测方法，仅供参考

import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;public class test {private static List<String> tablist= new ArrayList<String>();private static String url = "jdbc:gbasedbt-sqli://172.16.39.170:9099/xms:GBASEDBTSERVER=gbase01;DB_LOCALE=zh_CN.utf8;CLIENT_LOCALE=zh_CN.utf8;IFX_LOCK_MODE_WAIT=10;LOGINTIMEOUT=2000;IFX_SOC_TIMEOUT=3000;DELIMIDENT=Y";private static String username = "root";private static String password = "123456";private static String gettab_sql="select tabname from systables where tabid >99 and tabtype='T'";static{try {Class.forName("com.gbasedbt.jdbc.Driver");}catch (ClassNotFoundException e){System.out.println("class is not found\n");}}public static void main(String[] args) throws Exception {Connection connection=getConnection();tablist=getTabList(connection);System.out.println(tablist.size());ThreadPoolExecutor executorService = new ThreadPoolExecutor(5, 5, 60L, TimeUnit.SECONDS,new LinkedBlockingQueue<>(10),Executors.defaultThreadFactory(),new ThreadPoolExecutor.AbortPolicy());for (String item:tablist) {executorService.submit(()->{try {checkTab(item);}catch (Exception e){e.printStackTrace();}});}executorService.shutdown();}public static synchronized void  checkTab(String tabname) throws SQLException{String str= UUID.randomUUID().toString();System.out.println("线程"+Thread.currentThread().getName()+str+" 开始");System.out.println("处理表名:"+tabname);List<String> collist = new ArrayList<String>();String sql = "select colname from syscolumns where tabid =(select tabid from systables where tabname='" + tabname +"')" + "and coltype in (13,16,0,15,63,64,40,269,272,256,271,319,320,296);";Connection connection = getConnection();PreparedStatement ps = connection.prepareStatement(sql);ResultSet resultSet = ps.executeQuery();while (resultSet.next()) {collist.add(resultSet.getString(1));}for (String item : collist) {String sql_v1 = "select rowid," + item + " from " + tabname + ";";ps = connection.prepareStatement(sql_v1);resultSet = ps.executeQuery();while (resultSet.next()) {try {resultSet.getString(2);} catch (SQLException e) {int rowid = resultSet.getInt(1);System.out.println("发现乱码数据-->表名:"+tabname + ",rowid:" + rowid + ",列名" + item);continue;}}}closeConnection(connection, ps, resultSet);System.out.println("线程"+Thread.currentThread().getName()+str+" 结束");}public static List<String> getTabList(Connection connection) throws SQLException{PreparedStatement ps = connection.prepareStatement(gettab_sql);ResultSet resultSet=ps.executeQuery();while(resultSet.next()){tablist.add(resultSet.getString(1));}closeConnection(connection,ps,resultSet);return tablist;}public static  Connection getConnection(){Connection conn =null;try {conn = DriverManager.getConnection(url, username, password);}catch (SQLException e){System.out.println("get connect error");}return conn;}public static void closeConnection(Connection conn,PreparedStatement preparedStatement,ResultSet resultSet) throws SQLException{resultSet.close();preparedStatement.close();conn.close();}
}

运行效果如图

线程pool-1-thread-1f36dfb11-f6e4-4f49-88f3-0bbd865a1d56 开始
处理表名:pca
线程pool-1-thread-1f36dfb11-f6e4-4f49-88f3-0bbd865a1d56 结束
线程pool-1-thread-576a1acb5-380f-4bc2-b4d4-f7d72be76206 开始
处理表名:mm
线程pool-1-thread-576a1acb5-380f-4bc2-b4d4-f7d72be76206 结束
线程pool-1-thread-48d159c0c-f2b0-463f-ad4e-b7a97120c33b 开始
处理表名:vv1
线程pool-1-thread-48d159c0c-f2b0-463f-ad4e-b7a97120c33b 结束
线程pool-1-thread-38e2b0f83-3f2a-45f6-9419-77f705fd23cc 开始
处理表名:vv
线程pool-1-thread-38e2b0f83-3f2a-45f6-9419-77f705fd23cc 结束
线程pool-1-thread-2f5e65d90-16a1-459d-bd72-4df87c6ce201 开始
处理表名:nr_md_alarm_current
线程pool-1-thread-2f5e65d90-16a1-459d-bd72-4df87c6ce201 结束
线程pool-1-thread-363574a97-069a-47d4-bd45-efd76fc80144 开始
处理表名:ac
线程pool-1-thread-363574a97-069a-47d4-bd45-efd76fc80144 结束
线程pool-1-thread-43f35833a-c9e4-44e5-b6d3-bdc56370e2a2 开始
处理表名:cc
线程pool-1-thread-43f35833a-c9e4-44e5-b6d3-bdc56370e2a2 结束
线程pool-1-thread-54d32cf29-4f13-4909-abf0-ff8fbbc9d5b5 开始
处理表名:bb
线程pool-1-thread-54d32cf29-4f13-4909-abf0-ff8fbbc9d5b5 结束
线程pool-1-thread-13da931da-32f3-496b-b9b7-5cdbb70913be 开始
处理表名:kk
发现乱码数据-->表名:kk,rowid:257,列名c1
线程pool-1-thread-13da931da-32f3-496b-b9b7-5cdbb70913be 结束