java - springmvc 中 request.getAttribute("XXX"),断点执行两次

Question

java代码:

@Controller
public class TestController {
    @RequestMapping("test")
    public String test(HttpServletRequest request,
            HttpSession session,
            HttpServletResponse response, Model model){
//      System.out.println("11111111111111111");
        System.out.println("22222222222222222");
        Customer customer = (Customer) request.getAttribute(
                "customer");
        return "tml/common/voucher";
    }

}

断点打在
Customer customer = (Customer) request.getAttribute("customer");,
但是打印信息只打印了一次!
求解释啊

Answer 1

你这句有问题吧
Customer customer = (Customer) request.getAttribute("customer");

request.getAttribute("customer")获得一个String 类型的值，你直接强转成Customer对象
我觉的应该

Customer customer ＝ new Customer();
customer.setCustomer(request.getAttribute("customer"));

或者直接

public String test(HttpServletRequest request,
HttpSession session,HttpServletResponse response, Customer customer){
//把model改为对象，可以直接获得对象，前提是model的属性值和前台提交的属性值名称相同
}

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