需要引入接口

ServletResponseAware

1 public class Login extends ActionSupport implements SessionAware,ServletResponseAware 2 { 3          4     private HttpServletResponse response = null; 5 　　　　.... 6     public void setServletResponse(HttpServletResponse response) { 7         // TODO Auto-generated method stub 8         this.response = response; 9     }10 11     public String execute()12     {13         Person person = new Person();14         PersonDAO personDAO = new PersonDAO();15         if(personDAO.findById(id)==null)16         {17             System.out.println("用户不存在");18             try {19                 response.setContentType("text/html; charset=UTF-8");20                 response.setCharacterEncoding("UTF-8");        //防止乱码；21                 PrintWriter out = response.getWriter();22                 out.print("");23                 out.flush();24                 out.close();25             }26             catch (IOException e) {27                 // TODO Auto-generated catch block28                 e.printStackTrace();29             }30         }31     ....32     } 33 }34

不过很多网页，像淘宝之类的，他们的页面出错不是这么处理的，这种方法弹出提示框以后不能再返回页面