SpringMvc接受请求参数的几种情况演示
作者:wangjiedadada
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)
/** * 1.直接把表单的参数写在Controller相应的方法的形参中 * * @param username * @param password * @return */ @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
/** * 2、通过@PathVariable获取路径中的参数 * * @param username * @param password * @return */ @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)
/** * 3、通过HttpServletRequest接收 * * @param request * @return */ @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
/** * 4、通过一个bean来接收 * * @param user * @return */ @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
/** * 5、用注解@RequestParam绑定请求参数到方法入参 * @param username * @param password * @return */ @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;
/** *将json请求的key,value封装到实体对象当中。 * @param user * @return */ @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)
/** * 将请求参数封装到request对象当中。 * @param request * @return */ @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
/** * 通过http协议将参数转为jsonobject * @param request * @return * @throws IOException * @throws JSONException */ @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)
/** *将json请求的Key,value封装到map的key,value当中去。 * @param map * @return */ @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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