1.springmvc（注解版本）

注解扫描

Action类

@Controllerpublic class HelloAction {    public HelloAction(){        System.out.println(this .hashCode() );    }    @RequestMapping(value = "/hello.action")    public String hello(Model model)throws Exception{        System.out.println("hello");        model.addAttribute("message","this is the first....");        return "success";    }    @RequestMapping(value = "/bye.action")    public String bye(Model model)throws Exception{        System.out.println("bye");        model.addAttribute("message","bye");        return "success";    }}

2.一个Action中，写多个类似的业务控制方法

@Controller@RequestMapping(value="/user")public class UserAction {    @RequestMapping(value = "/register")    public String register(Model model)throws Exception{        model.addAttribute("message","注册成功");        return "/jsp/success.jsp";    }    @RequestMapping(value = "/login")    public String login(Model model)throws Exception{        model.addAttribute("message","登录成功");        return "/jsp/success.jsp";    }}

3.在业务控制方法中写入普通变量收集参数，限定某个业务控制方法，只允许GET或POST请求方式访问

@Controller@RequestMapping(value="/user")public class UserAction {    @RequestMapping(method= RequestMethod.POST,value = "/register")    public String register(Model model,String username,double salary)throws Exception{        System.out.println(username+salary);        model.addAttribute("message","注册成功");        return "/jsp/success.jsp";    }    @RequestMapping(value = "/login", method= {RequestMethod.POST,RequestMethod.GET})    public String login(Model model,String username,double salary)throws Exception{        System.out.println(username+salary);        model.addAttribute("message","登录成功");        return "/jsp/success.jsp";    }}

4.在业务控制方法中写入HttpServletRequest，HttpServletResponse，Model等传统web参数

@Controller@RequestMapping(value="/user")public class UserAction {    @RequestMapping(method= RequestMethod.POST,value = "/register" )    public void  register(HttpServletRequest request, HttpServletResponse response)throws Exception{        String username = request.getParameter("username");        String salary = request.getParameter("salary");        System.out.println(username+salary);        request.setAttribute("message","转发参数");//        response.sendRedirect(request.getContextPath()+"/jsp/success.jsp");        request.getRequestDispatcher("/jsp/success.jsp").forward(request,response);    }}

5.在业务控制方法中写入模型变量收集参数，且使用@InitBind来解决字符串转日期类型

　　jsp中的元素name属性不用加user.前缀

@Controller@RequestMapping(value="/user")public class UserAction {    @InitBinder    protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception {        //向springmvc中注册一个自定义的类型转换器        //参数一：将string转成什么类型的字节码        //参数二：自定义转换规则        binder.registerCustomEditor(Date.class,                new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"),true));    }    @RequestMapping(method= RequestMethod.POST,value = "/register" )    public String   register(User user, Model model)throws Exception{        System.out.println("用户注册");        model.addAttribute("user",user);        System.out.println(new Timestamp(user.getHiredate().getTime()));        return "/jsp/success.jsp";    }}

　　在业务控制方法中写入User，Admin多个模型收集参数，需要更大的模型包装User，Admin

6.在业务控制方法中收集数组参数

@Controller@RequestMapping(value = "/emp")public class EmpAction {    @RequestMapping(value = "/deleteAll",method = RequestMethod.POST)    public String deleteAll(Model model,int[] id)throws Exception{        for(int i:id)        {            System.out.println(i);        }        model.addAttribute("message","批量删除员工成功");        return "/jsp/success.jsp";    }}

jsp

     
    
      
               
        
         
            编号        
         
            姓名        
        
                        
                     
                            
                     
哈哈
                
                
                     
                            
                     
嘻嘻
                
                
                     
                            
                     
呵呵
                
                
                     
                            
                
           
      
     

7.在业务控制方法中收集List<JavaBean>参数

bean

public class Bean {    private List
     
       empList = new ArrayList
      
       ();    public  Bean(){}    public List
       
         getEmpList() {        return empList;    }    public void setEmpList(List
        
          empList) {        this.empList = empList;    }}
        
       
      
     

action

@Controller@RequestMapping(value = "/emp")public class EmpAction {    @RequestMapping(value = "/addAll",method = RequestMethod.POST)    public String addAll(Model model,Bean bean)throws Exception{        for(Emp emp:bean.getEmpList())        {            System.out.println(emp);        }        model.addAttribute("message","批量添加员工成功");        return "/jsp/success.jsp";    }}

jsp

8.结果的转发和重定向

@Controller@RequestMapping(value="/emp")                public class EmpAction {        @RequestMapping(value="/find")    public String findEmpById(int id,Model model) throws Exception{        System.out.println("查询"+id+"号员工信息");                //转发到EmpAction的另一个方法中去，即再次发送请求        return "forward:/emp/update.action";                //重定向到EmpAction的另一个方法中去，即再次发送请求        //return "redirect:/emp/update.action?id=" + id;    }    @RequestMapping(value="/update")    public String updateEmpById(int id,Model model) throws Exception{        System.out.println("更新" + id +"号员工信息");        model.addAttribute("message","更新员工信息成功");        return "/jsp/ok.jsp";    }    }

 

9.异步发送表单数据到JavaBean，并响应JSON文本返回

1.导入包jackson-core-asl-1.9.11、jackson-mapper-asl-1.9.11

2.配置json转换器

3.方法名中加注解

/**     * @ResponseBody Emp 表示让springmvc将Emp对象转成json文本     */    @RequestMapping(value="/bean2json")    public @ResponseBody Emp bean2json() throws Exception{        //创建Emp对象        Emp emp = new Emp();        emp.setId(1);        emp.setUsername("哈哈");        emp.setSalary(7000D);        emp.setHiredate(new Date());        return emp;    }            @RequestMapping(value="/listbean2json")    public @ResponseBody List
     
       listbean2json() throws Exception{        //创建List对象        List
      
        empList = new ArrayList
       
        ();        //向List对象中添加三个Emp对象        empList.add(new Emp(1,"哈哈",7000D,new Date()));        empList.add(new Emp(2,"呵呵",8000D,new Date()));        empList.add(new Emp(3,"嘻嘻",9000D,new Date()));        //返回需要转JSON文本的对象        return empList;    }        @RequestMapping(value="/map2json")    public @ResponseBody Map
        
          map2json() throws Exception{        //创建List对象        List
         
           empList = new ArrayList
          
           (); //向List对象中添加三个Emp对象 empList.add(new Emp(1,"哈哈",7000D,new Date())); empList.add(new Emp(2,"呵呵",8000D,new Date())); empList.add(new Emp(3,"嘻嘻",9000D,new Date())); //创建Map对象 Map
           
             map = new LinkedHashMap
            
             (); //向Map对象中绑定二个变量 map.put("total",empList.size()); map.put("rows",empList); //返回需要转JSON文本的对象 return map; }