package yh.position.Filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;
import org.hibernate.Session;
import org.hibernate.Transaction;
import yh.position.util.HibernateUtils;
/**
* 用于进行Hibernate事务处理的Servlet过滤器
*
* @author zyh 2015-10-21
*/
public class TransactionFilter implements Filter {
private static Logger log = Logger.getLogger(TransactionFilter.class);
/**
* 过滤器的主要方法 用于实现Hibernate事务的开始和提交
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
Session session = HibernateUtils.getSession();
Transaction tx = session.getTransaction();
if (!tx.isInitiator()) {
tx.begin();
}
System.out.println("----开启事物----");
try {
// 开始一个新的事务
log.info("Starting a database transaction");
// tx.begin();不注释就报错：nested transactions not supported
log.info("Request Path:\t"
+ ((HttpServletRequest) request).getServletPath());
// Call the next filter (continue request processing)
chain.doFilter(request, response);
// 提交事务
log.info("Committing the database transaction");
if (tx.isInitiator()) {
tx.commit();
}
System.out.println("----事物提交----");
} catch (Throwable ex) {
ex.printStackTrace();
try {
// 回滚事务
log.info("Trying to rollback database transaction after exception");
if (tx.isInitiator()) {
tx.rollback();
System.out.println("----回滚事务----");
}
} catch (Throwable rbEx) {
log.error("Could not rollback transaction after exception!",
rbEx);
}
// 抛出异常
throw new ServletException(ex);
} finally {
log.info("session closed");
HibernateUtils.closeSession();
}
}
/**
* Servlet过滤器的初始化方法 可以读取配置文件中设置的配置参数
*/
public void init(FilterConfig filterConfig) throws ServletException {
}
/**
* Servlet的销毁方法 用于释放过滤器所申请的资源
*/
public void destroy() {
}
}
Action
package yh.position.action.police;
import yh.position.action.BaseAction;
import yh.position.dao.impl.PoliceDaoImpl;
import yh.position.model.Police;
public class PoliceUpdatePwdAction extends BaseAction {
private static final long serialVersionUID = 1L;
private String newPwd;
public String getNewPwd() {
return newPwd;
}
public void setNewPwd(String newPwd) {
this.newPwd = newPwd;
}
@Override
public String execute() throws Exception {
int policeId = currPoliceId();
Police police = new PoliceDaoImpl().get(policeId);
police.setPwd(newPwd);
new PoliceDaoImpl().save(police);
code = 1;
message = "修改成功！";
int err = 1 / 0;
returnJson();
return SUCCESS;
}
}
结果jsp上显示了 除数为0的错误。可是控制台打印了事务的开启和提交，修改的数据也保存到数据库了。没有回滚的打印。
