SpringMvc接受请求参数的几种情况演示
说明:
通常get请求获取的参数是在url后面,而post请求获取的是请求体当中的参数。因此两者在请求方式上会有所不同。
1.直接将接受的参数写在controller对应方法的形参当中(适用于get提交方式)
@GetMapping("/addUser1")
public String addUser1(String username, String password) {
System.out.println ("username is:" + username);
System.out.println ("password is:" + password);
return username + "," + password;
}
2.通过url请求路径获取参数
@RequestMapping(value = "/addUser4/{username}/{password}", method = RequestMethod.GET)
public String addUser4(@PathVariable String username, @PathVariable String password) {
System.out.println ("username is:" + username);
System.out.println ("password is:" + password);
return "addUser4";
}
3.通过request请求对象来接受发来的参数信息(Get请求方式或者时Post请求方式都可以)
@RequestMapping("/addUser2")
public String addUser2(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 "demo/index";
}
4.封装JavaBean对象的方式来接受请求参数(get方式与post方式都可以)
4.1首先在模块当中创建对应的JavaBean,并提供相应的get,set方法。
package com.example.demo.pojo;
import lombok.Data;
@Data
public class User1 {
private String username;
private String password;
}
4.2Controller层
@RequestMapping("/addUser3")
public String addUser3(User1 user) {
System.out.println ("username is:" + user.getUsername ( ));
System.out.println ("password is:" + user.getPassword ( ));
return "/addUser3";
}
5.使用注解@RequestParam注解将请求参数绑定到Controller层对应方法的形参当中
@RequestMapping(value="/addUser6",method=RequestMethod.GET)
public String addUser6(@RequestParam("username") String username,@RequestParam("password") String password) {
System.out.println("username is:"+username);
System.out.println("password is:"+password);
return "demo/index";
}
下面介绍,发送json格式的请求,接受数据的情况:
1.将json请求的key,value值封装到实体对象的属性当中(通常将参数放在请求体body中,以application/json格式被后端获取)
1.1创建一个实体类
public class User2 implements Serializable {
private static final long serialVersionUID = 1L;
@JsonProperty(value = "id")
private Integer id;
@JsonProperty(value = "name")
private String name;
@JsonProperty(value = "age")
private Integer age;
@JsonProperty(value = "hobby")
private List<String> hobby;
@PostMapping("/save")
public String saveUser(@RequestBody User2 user) {
// list.add(user);
// User2 user2 = new User2 ( );
// user2.setId (user.getId ());
// user2.setAge (user.getAge ());
// user2.setName (user.getName ());
// user2.setHobby (user.getHobby ());
return "success"+user;
}
2.将json请求的key,value值封装到request对象的属性当中(通常请求参数放body中,将content-type改为x-www-form-urlencoded)
@PostMapping("/save2")
public User2 save(HttpServletRequest request) {
Integer id = Integer.parseInt(request.getParameter("id"));
String name = request.getParameter("name");
Integer age = Integer.parseInt(request.getParameter("age"));
String parameter = request.getParameter("hobby");
List<String> stringList = new ArrayList<> ( );
String[] split = parameter.split (",");
for (int i = split.length - 1; i >= 0; i--) {
stringList.add (split[i]);
}
User2 user2 = new User2(id, name, age, stringList);
// list.add(user);
return user2;
}
3.通过http协议,将json参数转成JSONOBject对象
3.1Controller层接受JSON参数
@PostMapping("/save3")
public User2 save3(HttpServletRequest request) throws IOException, JSONException {
JSONObject jsonObject = handlerData(request);
Integer id = jsonObject.getInteger("id");
String name = jsonObject.getString("name");
Integer age = jsonObject.getInteger("age");
List<String> hobby = jsonObject.getObject("hobby", List.class);
User2 user3 = new User2 (id, name, age, hobby);
// list.add(user);
return user3;
}
3.2通过以下方法将Json字符串转成Jsonobject对象
//这里使用的是alibaba的json工具类
public static JSONObject handlerData(HttpServletRequest request) throws IOException, JSONException {
StringBuffer sb = new StringBuffer();
InputStream is = request.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader (is, "utf-8"));
String s = "";
while ((s = br.readLine()) != null) {
sb.append(s);
}
if (sb.toString().length() <= 0) {
return null;
} else {
return JSONObject.parseObject(sb.toString());
}
}
4.将json格式的请求参数封装到hashmap的key,value键-值对当中。(json字符串串放在body中,请求格式为application/json格式)
@PostMapping("/save1")
public User2 saveUser1(@RequestBody Map<String, Object> map) {
Integer id = (Integer) map.get("id");
String name = (String) map.get("name");
Integer age = (Integer) map.get("age");
List<String> hobby=(List<String>) map.get("hobby");
User2 user = new User2(id, name, age, hobby);
// list.add(user);
return user;
}
该文档主要是学习以下两篇文档的总结:
https://www.cnblogs.com/lirenhe/p/10737673.html
https://blog.csdn.net/zyxwvuuvwxyz/article/details/80352712
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