我正在编写一个Java程序，该程序查询SQL数据库并提取查询，以查看数据库中是否存在用户名和密码。我的代码是：
我的代码是：
public UserInfo getUserExists(final String userEmail) throws SQLException, ClassNotFoundException {
if (!isBlank(userEmail)) {
Connection conn;
Statement stmt;
try{
Class.forName("org.mariadb.jdbc.Driver");
System.out.println("Connecting to DB...");
conn = DriverManager.getConnection("jdbc:mariadb://10.0.0.0:3306/mydb","myusername", "mypassword");
System.out.println("Connected to DB successfully");
System.out.println("querying if user is valid");
stmt = conn.createStatement();
ResultSet rs;
rs = stmt.executeQuery("SELECT IF (EXISTS(select user_email, user_pass, meta_value from myorg_users left join myorg_usermeta on ( myorg_users.id = myorg_usermeta.user_id) where meta_value LIKE '%\"administrator\"%' and meta_key=\"myorg_capabilities\" AND user_email="+userEmail+"),1,0) AS result;");
int result = 0;
System.out.println(rs);
while(rs.next()){
result = Integer.parseInt(rs.getString("result"));
System.out.println("result is " + result);
}
conn.close();
if(result == 1){
UserInfo SYSTEM_USER = new UserInfo.Builder(UserInfo.Username.valueOf("SYSTEM_USER")).withFirstName("System").withLastName("User").withEmail(userEmail).withUserId("sample").build();
System.out.println(SYSTEM_USER);
return SYSTEM_USER;
}
}
catch(SQLException se){
se.printStackTrace();
}
catch(Exception e){
e.printStackTrace();
}
} else {
throw new AuthenticationException("user does not exists in system");
}
System.out.println("executed new user exists");
return null;
}
但是，当我运行我的API时，我得到了，并且我知道密码/用户名是正确的-
java.sql.SQLSyntaxErrorException: Access denied for user 'myusername'@'10.%' to database 'mydb'
at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.get(ExceptionMapper.java:163)
at org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper.getException(ExceptionMapper.java:106)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.connectWithoutProxy(AbstractConnectProtocol.java:1036)
at org.mariadb.jdbc.internal.util.Utils.retrieveProxy(Utils.java:490)
at org.mariadb.jdbc.MariaDbConnection.newConnection(MariaDbConnection.java:144)
at org.mariadb.jdbc.Driver.connect(Driver.java:90)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at com.intuit.wasabi.authentication.impl.DefaultAuthentication.getUserExists(DefaultAuthentication.java:168)
at com.intuit.wasabi.api.AuthenticationResource.getUserExists(AuthenticationResource.java:214)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:287)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:277)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:182)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)
at com.intuit.autumn.web.WebFilter.doFilter(WebFilter.java:65)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:119)
at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:133)
at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:130)
at com.google.inject.servlet.GuiceFilter$Context.call(GuiceFilter.java:203)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:130)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1676)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1160)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1092)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
at org.eclipse.jetty.server.Server.handle(Server.java:518)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:244)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:246)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:156)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.sql.SQLException: Access denied for user 'myusername'@'10.%' to database 'mydb'
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.authentication(AbstractConnectProtocol.java:787)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.handleConnectionPhases(AbstractConnectProtocol.java:713)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.connect(AbstractConnectProtocol.java:402)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.connectWithoutProxy(AbstractConnectProtocol.java:1032)
... 59 more
发生了什么事？我已经在数据库中运行了此查询，并且该查询在MariaDB中有效。为什么我无法实现Java所需的功能？
除了Java，您确定要在10.0.0.0上访问数据库吗？我有根据地猜测，您的MariaDB配置为在回送接口（127.0.0.1）上进行侦听，因此，如果您的MariaDB未配置为侦听其他接口，则可能会导致连接被拒绝。因此，如果您确定可以在phpmyadmin中做到这一点，我将开始进行检查（我想您使用的是它，并且可以通过localhost访问它？）。和10.0.0.0不应该是一个IP。