我们可以在控制器方法中设置一个 HttpServletRequest 类型的形参,

Spring MVC 会自动将请求中携带的参数封装到 HttpServletRequest 形参中,

然后我们就可以通过 HttpServletRequest 提供的 getParameter() 方法获取所需的请求参数了。

package org.example.controller.requestparam;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;


@RestController
public class ForParamController
{

    // http://localhost:8080/getRequestParam?name=C语言中文网&url=c.biancheng.net

    /**
     * 通过 HttpServletRequest 获取请求参数
     * @param request
     * @return
     */
    @RequestMapping("/getRequestParam")
    public String requestParam(HttpServletRequest request) {

        String name = request.getParameter("name");
        String url = request.getParameter("url");

        System.out.println("name:" + name);
        System.out.println("url:" + url);


        return "cheng_gong";
    }
}

 

注意:

通过HttpServletRequest来获取前端页面参数,代码见下图 ,简单来说就是通过调用request的getParameter方法来获取参数

这种方式也可以获取表单参数,一般get和post请求都可以。此处只演示get请求。

无注解下获取参数,需要控制器层参数与HTTP请求栏参数名称一致,这样后台就可以获取到请求栏的参数。

==============================================================================

package org.example.controller.requestparam;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;


@RestController
public class ForParamController
{

    // http://localhost:8080/getRequestParam?name=C语言中文网&url=c.biancheng.net

    /**
     * 通过 HttpServletRequest 获取请求参数
     * @param request
     * @return
     */
    @RequestMapping("/getRequestParam")
    public String requestParam(HttpServletRequest request) {

        String name = request.getParameter("name");
        String url = request.getParameter("url");

        System.out.println("name:" + name);
        System.out.println("url:" + url);


        return "cheng_gong";
    }


    // http://localhost:8080/getRequestParam?firstName=C语言中文网&lastName=c.biancheng.net
    @RequestMapping(value = "/getRequestParam2")
    public String test2(HttpServletRequest request) {
        String a = request.getParameter("firstName");
        String b = request.getParameter("lastName");
        return a + b;
    }
}

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