作者简介

一、@RequestParam

1. 传递基本类型参数

@RequestMapping("QueryStringTest1")
public String QueryStringTest1(@RequestParam("id") String id,@RequestParam("name") String name){
    return "id is "+ id+",name is "+ name;
}

Postman 中调用

• 省略1

@RequestMapping("QueryStringTest2")
public String QueryStringTest2(@RequestParam String id,@RequestParam String name){
    return "id is "+ id+",name is "+ name;
}

注意：因为有RequestParam注解的存在，所以传参必须包含所有使用RequestParam注解的接收参数，否则会报错（允许传空，但是必须包含参数）；
可以使用@RequestParam(value = “id”,required = false) 的方式，让id未传也可以。

• 省略2

@RequestMapping("QueryStringTest3")
public String QueryStringTest3(String id, String name){
    return "id is "+ id+",name is "+ name;
}

允许其中的参数不传，不会报错，但取值为null，比如name不传

@RequestMapping("QueryStringTest4")
public String QueryStringTest4(@RequestParam("id") String myId,@RequestParam("name") String myName){
   return "myId is "+ myId+",myName is "+ myName;
}

2. 传递对象类型参数

 @RequestMapping("objectTest1")
 public String objectTest1(User user){
     return "user.id is "+ user.getId()+",user.name is "+ user.getName();
 }

@RequestMapping("objectTest3")
public String objectTest3(@RequestParam User user){
    return "user.id is "+ user.getId()+",user.name is "+ user.getName();
}

3. 传递数组、集合类型

• 数组

@RequestMapping("arrayTest1")
public String[] arrayTest1(@RequestParam String[] name){
    for (String temp:name){
        System.out.println(temp);
    }
    return name;
}

• 集合

@RequestMapping("listTest1")
public List listTest1(@RequestParam List name){
    for(int i=0;i<name.size();i++){
        System.out.println("list name==="+name.get(i));
    }
    return name;
}

二、@PathVariable

路径传参方式是将参数直接包含在URL路径中，比如URL/paramValue1/paramValue2

1. 传递基本类型参数

 @RequestMapping("pathTest1/{id}/{name}")
 public String pathTest1(@PathVariable("id") String id, @PathVariable("name") String name){
     return "id is "+ id+",name is "+ name;
 }

@RequestMapping("pathTest2/{id}/{name}")
public String pathTest2(String id,String name){
    return "id is "+ id+",name is "+ name;
}

2. 传递数组、集合类型

• 数组

@RequestMapping("pathArrayTest1/{name}")
public String[] pathArrayTest1(@PathVariable("name") String[] names){
    for (String name:names){
        System.out.println("array name:"+name);
    }
    return names;
}

• 集合

@RequestMapping("pathListTest1/{name}")
public List pathListTest1(@PathVariable("name") List names) {
    for (int i=0;i<names.size();i++) {
        System.out.println("list name:" + names.get(i));
    }
    return names;
}

• 文件

// MultipartFile接收
@PostMapping("upload")
public String uploadFile(@RequestParam("file") MultipartFile myFile){
    return "type："+myFile.getContentType()
            +" fileName："+myFile.getOriginalFilename()
            +" size："+myFile.getSize();
}

测试的注意点

三、@RequestBody

1. 传递基本类型参数

@RequestMapping("bodyTest1")
public String bodyTest1(@RequestBody String name){
   return "name is："+name;
}

2. 传递对象类型参数

@RequestMapping("bodyTest2")
public String bodyTest2(@RequestBody User user){
    return "name is："+user.getName() + " age is："+user.getAge();
}

3. 传递数组、集合类型

• 数组

@RequestMapping("bodyTest3")
public String bodyTest3(@RequestBody String[] users){
    return Arrays.asList(users).toString();
}

• 集合

@RequestMapping("bodyTest4")
public String bodyTest4(@RequestBody List<User> users){
    return users.toString();
}

@RequestMapping("bodyTest5")
public String bodyTest5(@RequestBody List<String> users){
    return users.toString();
}

*Json对象

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>fastjson</artifactId>
	<version>1.2.56</version>
</dependency>

@RequestMapping("bodyTest6")
public String bodyTest6(@RequestBody JSONObject user){
    return "name is ："+user.get("name")+
            " age is ："+user.get("age");
}

四、HttpServletRequest

@RequestMapping("httpRequest")
public String httpRequest(HttpServletRequest request){
    return "name is ："+request.getParameter("name")+
            " age is ："+request.getParameter("age");
}

或者

五、@PathVariable+@RequestParam混合

@RequestMapping("pathAndParam/{id}")
public String pathAndParam(@PathVariable("id") String id, @RequestParam("name") String name){
    return "id is "+ id+",name is "+ name;
}

六、@PathVariable+@RequestBody混合

@RequestMapping("pathAndBody/{id}")
public String pathAndBody(@PathVariable("id") String id, @RequestBody User user){
    return "id is "+ id+",name is "+ user.getName();
}

七、无注解传参

@RequestMapping("other")
public String other(User user){
    return "name is："+user.getName() + " age is："+user.getAge();
}

小结

这节总结了“ Springboot传参详解 ”，希望能对大家有所帮助，请各位小伙伴帮忙 【点赞】+【收藏】， 如果有兴趣跟小明哥一起学习Java和前端的，【关注一波】不迷路哦。
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