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springboot 如何获取URL请求参数呢？

下文笔者讲述SpringBoot请求URL参数的方法分享，如下所示

URL请求参数：是web客户端同服务器交流数据的一种方式那么SpringBoot中如何从url中获取指定的参数值呢？下文将一一道来,如下所示:

方式1:直接将参数写在Controller的形参中

例:

    @RequestMapping("/addUser1")public String addUser1(String username,String password) {System.out.println("用户名:"+username);System.out.println("密码:"+password);return "index";}http://localhost:8080/addUser1?username=chengcheng&password=87654321

方式2：使用HttpServletRequest的方式接收

    @RequestMapping("/addUser2")public String addUser2(HttpServletRequest request) {String username=request.getParameter("username");String password=request.getParameter("password");System.out.println("用户名:"+username);System.out.println("密码:"+password);return "index";}

方式3：使用bean对象接收参数

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;}}@RequestMapping("/addUser3")public String addUser3(UserModel user) {System.out.println("用户名:"+user.getUsername());System.out.println("密码:"+user.getPassword());return "index";}

方式4:使用@PathVariable获取路径中的参数

@RequestMapping(value="/addUser4/{username}/{password}",method=RequestMethod.GET)
public String addUser4(@PathVariable String username,@PathVariable String password) {System.out.println("用户名:"+username);System.out.println("密码:"+password);return "index";}
http://localhost:8080/addUser4/usernametest/pwd88888

方式5:使用@ModelAttribute注解获取POST请求的FORM表单数据

Jsp表单: 
/demo/addUser5" method="post"> 用户名: 
密  码: 
  
 @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";}

方式6:使用注解@RequestParam绑定请求参数到方法入参

当请求参数username不存在时会有异常发生可以通过设置属性required=false解决例@RequestParam(value="username", required=false)@RequestMapping(value="/addUser6",method=RequestMethod.GET)public String addUser6(@RequestParam("username") String username,@RequestParam("password") String password) {System.out.println("用户名:"+username);System.out.println("密码:"+password);return "demo/index";}