android虚拟机链接java web服务器报错java.sql.SQLException: Access denied for user ''@'local

java.sql.SQLException: Access denied for user ''@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:943)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4113)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1308)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2336)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:792)
at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
三月 09, 2016 2:30:25 下午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [LoginServlet] in context with path [/WirelessOrder_Server] threw exception
java.lang.NullPointerException
at com.amaker.util.DBUtil.closeConn(DBUtil.java:20)
at com.amaker.dao.impl.UserDaoImpl.login(UserDaoImpl.java:60)
at com.amaker.servlet.LoginServlet.doGet(LoginServlet.java:30)
at com.amaker.servlet.LoginServlet.doPost(LoginServlet.java:53)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

数据库 拒绝这个用户 可能是你的 root 用户没有密码，或者root用户密码不正确，换一个用户名

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