在db变量声明后添加此变量：
String unipre= "?useUnipre=yes&characterEncoding=UTF-8";
然后修改您的行：
con = DriverManager.getConnection(url+db,"root","");
至
con = DriverManager.getConnection(url+db+unipre,"root","");
在db变量声明后添加此变量：
String unipre= "?useUnipre=yes&characterEncoding=UTF-8";
然后修改您的行：
con = DriverManager.getConnection(url+db,"root","");
至
con = DriverManager.getConnection(url+db+unipre,"root","");
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