Sonar-Runner在Windows上无法正常工作

I have setup sonar on my windows 7 , server starts fine. Using sonar runner for my php project.But getting " Cannot load JDBC driver class 'com.mysql.jdbc.Driver'". Searched on google but didn't find any proper way. I've created new user under mysql with the name of sonar and same password. This is the sonar-runner.properties code

sonar.jdbc.url= jdbc:mysql://localhost:3306/sonar?useUnicode=true&characterEncoding=utf8
sonar.jdbc.username=sonar
sonar.jdbc.password=sonar