Spring Boot 获取URL请求参数的方法

1. 通过 @RequestParam 注解获取 url 参数

url格式：http://localhost/adduser?username=codebaoku&password=88888

@GetMapping("/adduser")
public String addUser(@RequestParam("username") String username,@RequestParam("password") String password) {
    System.out.println("username is:"+username);
    System.out.println("password is:"+password);
    return "username is:"+username + " " + "password is:"+password;
}

2. 把 url 参数写在 Controller 相应的方法的形参中

url格式：http://localhost/adduser?username=codebaoku&password=88888

// 注意方法中的参数名要与url中携带的参数名一样
@RequestMapping("/adduser")
public String addUser(String username,String password) {
   System.out.println("username is:"+username);
   System.out.println("password is:"+password);
   return "username is:"+username + " " + "password is:"+password;
}

3. 通过 HttpServletRequest 接收参数

url格式：http://localhost/adduser?username=codebaoku&password=88888

@RequestMapping("/adduser")
public String addUser(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 "username is:"+username + " " + "password is:"+password;
}

4. 通过 bean 接收参数

url格式：http://localhost/adduser?username=codebaoku&password=88888

bean：

// 注意这里类的属性名要和url请求携带的参数名一样
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;
    }
}

用这个bean来封装接收的参数：

@RequestMapping("/adduser")
public String addUser(UserModel user) {
    System.out.println("username is:"+user.getUsername());
    System.out.println("password is:"+user.getPassword()); 
    return "username is:"+username + " " + "password is:"+password;
 }

Spring Boot 通过 @PathVariable 注解获取 Url 路径参数。我们可以将 URL 中占位符参数绑定到控制器处理方法的参数：1. 在 @GetMapping 或者 @R ...