springboot-18-springboot的參數封裝

springboot的參數封裝, 和springmvc相識spring

簡單參數的封裝

一、直接把表單的參數寫在Controller相應的方法的形參中,適用於get方式提交,不適用於post方式提交。數組

    /**
     * 1.直接把表單的參數寫在Controller相應的方法的形參中
      * @param username
     * @param password
     * @return
     */
    @RequestMapping("/addUser1")
    public String addUser1(String username,String password) {
        System.out.println("username is:"+username);
        System.out.println("password is:"+password);
        return "demo/index";
    }

二、經過HttpServletRequest接收,post方式和get方式均可以。springboot

    /**
     * 二、經過HttpServletRequest接收
      * @param request
     * @return
     */
    @RequestMapping("/addUser2")
    public String addUser2(HttpServletRequest request) {
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        System.out.println("username is:"+username);
        System.out.println("password is:"+password);
        return "demo/index";
    }

三、經過一個bean來接收,post方式和get方式均可以。mvc

(1)創建一個和表單中參數對應的beanapp

package demo.model;

public class UserModel {
    
    private String username;
    private String password;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    
}

(2)用這個bean來封裝接收的參數post

    /**
     * 三、經過一個bean來接收
      * @param user
     * @return
     */
    @RequestMapping("/addUser3")
    public String addUser3(UserModel user) {
        System.out.println("username is:"+user.getUsername());
        System.out.println("password is:"+user.getPassword());
        return "demo/index";
    }

四、經過@PathVariable獲取路徑中的參數ui

  /**
     * 四、經過@PathVariable獲取路徑中的參數
      * @param username
     * @param password
     * @return
     */
    @RequestMapping(value="/addUser4/{username}/{password}",method=RequestMethod.GET)
public String addUser4(@PathVariable String username,@PathVariable String password) {
        System.out.println("username is:"+username);
        System.out.println("password is:"+password);
        return "demo/index";
    }

五、使用@ModelAttribute註解獲取POST請求的FORM表單數據this

<form action ="<%=request.getContextPath()%>/demo/addUser5" method="post"> 
     用戶名:&nbsp;<input type="text" name="username"/><br/>&nbsp;&nbsp;碼:&nbsp;<input type="password" name="password"/><br/>
     <input type="submit" value="提交"/> 
     <input type="reset" value="重置"/> 
</form> 

controllerspa

    /**
     * 五、使用@ModelAttribute註解獲取POST請求的FORM表單數據
      * @param user
     * @return
     */
    @RequestMapping(value="/addUser5",method=RequestMethod.POST)
    public String addUser5(@ModelAttribute("user") UserModel user) {
        System.out.println("username is:"+user.getUsername());
        System.out.println("password is:"+user.getPassword());
        return "demo/index";
    }

六、用註解@RequestParam綁定請求參數到方法入參.net

當請求參數username不存在時會有異常發生,能夠經過設置屬性required=false解決,例如: @RequestParam(value="username", required=false)

    /**
     * 六、用註解@RequestParam綁定請求參數到方法入參
      * @param username
     * @param password
     * @return
     */
    @RequestMapping(value="/addUser6",method=RequestMethod.GET)
    public String addUser6(@RequestParam("username") String username,@RequestParam("password") String password) {
        System.out.println("username is:"+username);
        System.out.println("password is:"+password);
        return "demo/index";
    }

 

複雜參數的封裝

複雜參數是指 數組, 集合等對象, 其中bean屬性對應參數的封裝: 

未完待續....

 

 

原文連接: http://blog.csdn.net/yalishadaa/article/details/68937141

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