springboot获取URL请求参数的多种方式

 /**
   * 1.直接把表单的参数写在Controller相应的方法的形参中
   * @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";
  }

  /**
   * 2、通过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";
  }

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;
  }
}

/**
   * 3、通过一个bean来接收
   * @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";
  }

 /**
   * 4、通过@PathVariable获取路径中的参数
   * @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";
  }

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

  /**
   * 5、使用@ModelAttribute注解获取POST请求的FORM表单数据
   * @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";
  }

 /**
   * 6、用注解@RequestParam绑定请求参数到方法入参
   * @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";
  }