@RequestParam的具体使用

• 作用：将请求体url里面的参数绑定到controller里对应名字的参数上

• 语法：@RequestParam(value=”参数名”,required=”true/false”,defaultValue=””)

• 具体代码：

package com.day01springmvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;
 
/**
 * @ Author     ：ShaoWei Sun.
 * @ Date       ：Created in 20:58 2018/11/16
 */
@RestController
public class HelloController2 {
 
    
    /**
     * 接收普通请求参数
     * http://localhost:8080/hello/show16?name=linuxsir
     * url参数中的name必须要和@RequestParam("name")一致
     * @return
     */
    
    @RequestMapping("show16")
    public String test16(@RequestParam("name")String name){
        return name;
    }
}

    /**
     * 接收普通请求参数
     * http://localhost:8080/hello/show17
     * url中没有name参数不会报错、有就显示出来
     * @return
     */
    @RequestMapping("show17")
    public String test17(@RequestParam(value="name",required=false)String name){
       return name;
    }
 

 /**
     * 接收普通请求参数
     * http://localhost:8080/hello/show18?name=998 显示为998
     * http://localhost:8080/hello/show18?name 显示为hello
     * @return
     */
    @RequestMapping("show18")
    public String test18(@RequestParam(value="name",required=true,defaultValue="hello")String name){
       return name;
    }
 

quired=true,defaultValue=“hello”)String name){
return name;
}

![img](https://www.icode9.com/i/ll/?i=img_convert/0bb416c4e8ec3e281c4e23664f71a13c.png)