SpringMVC和SpringBoot接收参数的几种方式详解
作者:北漂IT民工_程序员_ZG
这篇文章主要介绍了SpringMVC和SpringBoot接收参数的几种方式详解,Spring是分层的JavaSE/EE应用轻量级开源框架,以IoC和AOP为内核,提供了展现层 Spring MVC和持久层Spring JDBC以及业务层事务管理等众多的企业级应用技术,需要的朋友可以参考下
SpringMVC、SpringBoot接收参数
SpringMVC和SpringBoot接收参数的方式是一样一样的。
一、传非json参数
下面代码是get、post请求都支持,不过我们是把参数放到路径上,一半这种情况下都用get请求。
涉及到的注解:
- @RequestParam主要用于在SpringMVC后台控制层获取参数,它有三个常用参数:defaultValue = “0”, required = false, value = “xxx”;defaultValue 表示设置默认值,required 表示该参数是否必传,value 值表示接受的传入的参数的key。
- @PathVariable用于将请求URL中的模板变量映射到功能处理方法的参数上,即取出uri模板中的变量作为参数。
/** * http://localhost:80/add?username=zg&password=123456 * get post都支持,一半路径传参都用get请求 * @param username * @param password */ @RequestMapping(value = "/add") public void add(String username, String password) { log.info("打印参数:{}--{}", username, password); } /** * http://localhost:80/add2?username=zg&password=123456 * get post都支持,一半路径传参都用get请求 * @param username * @param password * @return */ @RequestMapping(value = "/add2", name = "haha") public void add2(@RequestParam(value = "username") String username, @RequestParam("password") String password) { log.info("打印参数:{}--{}", username, password); } /** * http://localhost:80/add3?username=zg&password=123456 * get post都支持,一半路径传参都用get请求 * @return */ @RequestMapping(value = "/add3") public void add3(User user) { log.info("打印参数:{}--{}", user.getUserName(), user.getPassword()); } /** * http://localhost:80/add4/zg/123456 * get post都支持,一半路径传参都用get请求 * @param username * @param password */ @RequestMapping(value = "/add4/{username}/{password}") public void add4(@PathVariable String username, @PathVariable String password) { log.info("打印参数:{}--{}", username, password); } /** * http://localhost:80/add5?username=zg&password=123456 * get post都支持,一半路径传参都用get请求 * @param request */ @RequestMapping(value = "/add5") public void add5(HttpServletRequest request) { String username = request.getParameter("username"); String password = request.getParameter("password"); log.info("打印参数:{}--{}", username, password); }
二、传json参数
1、单个实体接收参数
/** * http://localhost/toUser/add6 * body: {"username":"张刚","password":"123456"} * get post都可以 * * @param user * @return */ @RequestMapping(value = "/add6") public void add6(@RequestBody User user) { log.info("打印参数:{}--{}", user.getUserName(), user.getPassword()); }
2、实体嵌套实体接收参数
注解:
- @RequestBody:该注解会把接收到的参数转为json格式
实体
@Data @ToString public class People { private Integer count; private String peoplename; private Student student; } @Data @ToString public class Student { private String studentname; }
/** * http://localhost:80/add7 * body: {"peoplename":"张刚","student":{"studentname":"你好"}} * get post都可以, body传参一般都用post * @param */ @RequestMapping(value = "/add7") public void add7(@RequestBody People people) { log.info("打印参数:{}--{}", people.getPeoplename(), people.getStudent().getStudentname()); }
3、实体嵌套List接收参数
实体
@Data @ToString public class People { private Integer count; private String peoplename; private List<Student> student; } @Data @ToString public class Student { private String studentname; }
/** * http://localhost:80/add8 * body: {"peoplename":"张刚","student":[{"studentname":"你好"},{"studentname":"很好"}]} * get post都可以, body传参一般都用post * @param */ @RequestMapping(value = "/add8") public void add8(@RequestBody People people) { List<Student> student = people.getStudent(); student.stream().forEach(System.out::println); log.info("打印参数:{}--{}", people.getPeoplename()); }
4、Map接收参数
/** * http://localhost:80/add9 * body: {"peoplename":"张刚","student":[{"studentname":"你好"},{"studentname":"很好"}]} * get post都可以, body传参一般都用post * * @param */ @RequestMapping(value = "/add9") public void add7(@RequestBody Map<String, Object> map) { log.info(map.get("peoplename").toString()); List<Map<String, Object>> studentMapList = (List<Map<String, Object>>) map.get("student"); studentMapList.stream().forEach(System.out::println); }
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