SpringMVC和SpringBoot接收参数的几种方式详解

• SpringMVC、SpringBoot接收参数
• 一、传非json参数
• 二、传json参数
• 1、单个实体接收参数
• 2、实体嵌套实体接收参数
• 3、实体嵌套List接收参数
• 4、Map接收参数

SpringMVC和SpringBoot接收参数的方式是一样一样的。

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);
    }

    /**
     * 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());
    }

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());
    }

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());
    }

  /**
     * 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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