SpringMVC

//一、传递普通参数
@Controller("parController")//给该注解别名，其他地方调用的对象名就为parController
@RequestMapping("/")
public class ParamController{
    @RequestMapping("otherPage")
    public String jumpOtherPage(){
		System.out.println("第一个请求!");
        return "otherPage.jsp";
        //return "redirect:otherPage.jsp";
    }
    @RequestMapping("sendParam")
    public String sendParam(@RequestParam(value="username",required=false) String userName,@Reqeust("password") String userPass){
        System.out.println("账号"+userName);
        System.out.println("密码"+userPass);
        return "showParam.jsp";
    }
    @RequestMapping("sendParamWithRequest")
    public String sendParamWithRequest(@RequestParam("username") String userName,@Reqeust("password") String userPass,HttpServletRequest request){
        System.out.println("账号"+userName);
        System.out.println("密码"+userPass);
        
        request.setAttribute("userName",userName);
        return "showParam.jsp";
    }
    @RequestMapping("sendSameNameWithRequest")
    public String sendSameNameWithRequest(@RequestParam String username,@Reqeust String password,HttpServletRequest request){
        System.out.println("账号"+username);
        System.out.println("密码"+password);
        
        request.setAttribute("userName",username);
        return "showParam.jsp";
    }
    @RequestMapping("sendSameNameWithRequestRedirect")
    public String sendSameNameWithRequest(@RequestParam String username,@Reqeust String password) throws UnsupportedEncodingException{
        return "redirect:showParam.jsp?username="+URLEncoder.encode(username,"utf-8")+"&password="+password;
    }
    
    @RequestMapping("sendSameNameWithRequestRedirectSpring")
    public String sendSameNameWithRequestRedirectSpring(@RequestParam String username,@Reqeust String password,Redirect attrs) throws UnsupportedEncodingException{
        attrs.addAttribute("username",username);
        attrs.addAttribute("password",passwrod);
        return "redirect:showParam.jsp"	;
    }
}

//路径参数
@Controller
@RequestMapping("/")
public class PathVariableController{
    //getPage3By100Items
    @Request String multiPageQuery(@PathVariable int pageNo,@PageVariable int countPage){
        System.out.println(pageNo+" "+countPage);
        return "otherPage.jsp";
    }
}

//三、传递表单数据到实体对象中(模型属性)
@Controller
@RequestMapping("/")
public class UserController{
    @ReqeustMapping(value="login",method={RequestMethod.POST})
    public String login(@ModelAttribute("user") User pUser){
        //模型属性会自动放入reqeust中
    }
}

//四、控制器跳转至另一个控制器
//转发
return "sendSameNameParamWithRequest.form";
//重定向利用RedirectAttributes attrs

public class User{
    @Pattern(regexp="^\\S{3,16}$",message="账号名必须是3-16位的非空白字符!")
    private String username;
    @NotNull(message="此字段不能为null!")
    @NotEmpty(message="此字段不能为空!")
    @Length(min=3,max=16,message="密码必须是3-16位!")
    priavte String password;
}

@Controller
@ReqeustMapping("/")
public class UserControlelr{
    @RequestMapping("login")
    public String login(@Valid @ModelAttribute User user,BindingResult bindingResult){
        //BindingResult存放出错信息
        //首先判断字段校验是否通过，若未通过，则不需要进行登陆验证!
        if(bindingResult.hasErrors()){
            return "index.jsp";
		}
        //登陆验证
        if("zhangsan".equals(user.getUserName())&&"123456".equals(user.getUserpass())){
            return "loginSuccess.jsp";
        }
        return "loginFailed.jsp";
    }
}

@Controller
@RequestMapping("/")
public class UserController{
    @RequestMapping("login")
    public ModelAndView login(@ModelAttribute User user){
        ModelAndView mav = new ModelAndView("index.jsp");
        mav.addObject("otherInfo","呵呵");
        return mav;
    }
}

public class LoginInterceptor implements HandlerInterceptor{
    //请求执行之后，再执行的方法，一般在此处清理释放资源
    public void afterCompletion(HttpServletRequest req,HttpServletResponse resp,Object obj,Exception exc) throws Exception{}
    
    //正在执行请求，准备跳转页面之前执行的方法，一般在此处我们可以处理一部分请求或添加一部分响应头等
    public void postHandle(HttpServletRequest req,HttpServletResponse resp,Object obj,ModelAndView mav) throws Exception{}
    
    //正在执行请求，准备跳转页面之前执行的方法，一般在此处我们可以处理一部分请求或添加一部分响应头等
    public boolean preHandle(HttpServletRequest req,HttpServletResponse resp,Object obj) throws Exception{
        User user = req.getSession().getAttribute("loginUser");
        if(user==null){
            req.sendRedirect("index.jsp");
            return false;	//阻止继续向下传递请求
        }
        return true; //放行
    }
    
}