SpringMVC实现获取请求参数方法详解

<a th:href="@{/testServletAPI(username='admin',password=123456)}" rel="external nofollow" >测试使用testServletAPI获取请求参数</a>

    @RequestMapping("/testServletAPI")
    //形参位置的request就表示当前请求
    public String testServletAPI(HttpServletRequest request){
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        System.out.println("username:"+username+",password:"+password);
        return "success";
    }

<a th:href="@{/testParam(username='admin',password=123456)}" rel="external nofollow" >测试通过控制器方法的形参获取请求参数</a><br>

    @RequestMapping("/testParam")
    //必须保证形参名和请求传递的参数名一致
    public String testParam(String username, String password){
        System.out.println("username:"+username+",password:"+password);
        return "success";
    }

<form th:action="@{/testParam}" method="get">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    爱好：<input type="checkbox" name="hobby" value="a">a
        <input type="checkbox" name="hobby" value="b">b
        <input type="checkbox" name="hobby" value="c">c<br>
    <input type="submit" value="测试通过控制器方法的形参获取多个同名请求参数">
</form>

    @RequestMapping("/testParam")
    //必须保证形参名和请求传递的参数名一致
    public String testParam(String username, String password,String hobby){
        System.out.println("username:"+username+",password:"+password+",hobby:"+hobby);
        return "success";
    }

    @RequestMapping("/testParam")
    //必须保证形参名和请求传递的参数名一致
    public String testParam(String username, String password,String[] hobby){
        System.out.println("username:"+username+",password:"+password+",hobby:"+ Arrays.toString(hobby));
        return "success";
    }

    @RequestMapping("/testParam")
    //当形参名和请求参数名不一致时，通过注解@RequestParam绑定形参和请求参数
    public String testParam(
            @RequestParam("username") String user_name,
            String password,
            String[] hobby){
        System.out.println("user_name:"+user_name+",password:"+password+",hobby:"+ Arrays.toString(hobby));
        return "success";
    }

    @RequestMapping("/testParam")
    //当形参名和请求参数名不一致时，通过注解@RequestParam绑定形参和请求参数
    public String testParam(
            @RequestParam("username") String user_name,
            String password,
            String[] hobby,
            //通过注解@RequestHeader将请求头信息和控制器方法的形参创建映射关系
            @RequestHeader("Host") String host){
        System.out.println("user_name:"+user_name+",password:"+password+",hobby:"+ Arrays.toString(hobby));
        System.out.println("host:"+host);
        return "success";
    }

    @RequestMapping("/testParam")
    //当形参名和请求参数名不一致时，通过注解@RequestParam绑定形参和请求参数
    public String testParam(
            @RequestParam("username") String user_name,
            String password,
            String[] hobby,
            //通过注解@RequestHeader将请求头信息和控制器方法的形参创建映射关系
            @RequestHeader("Host") String host,
            //通过注解@CookieValue将cookie数据和控制器方法的形参创建映射关系
            @CookieValue("JSESSIONID") String JSESSIONID){
        System.out.println("user_name:"+user_name+",password:"+password+",hobby:"+ Arrays.toString(hobby));
        System.out.println("host:"+host);
        System.out.println("JSESSIONID:"+JSESSIONID);
        return "success";
    }

public class User {
    private Integer id;
    private String username;
    private String password;
    private Integer age;
    private String sex;
    private String email;
    public User() {
    }
    public User(Integer id, String username, String password, Integer age, String sex, String email) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.age = age;
        this.sex = sex;
        this.email = email;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", age=" + age +
                ", sex='" + sex + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

<form th:action="@{/testPojo}" method="get">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    性别：<input type="radio" name="sex" value="男">男<input type="radio" name="sex" value="女">女<br>
    年龄：<input type="text" name="age"><br>
    邮箱：<input type="text" name="email"><br>
    <input type="submit" value="测试通过POJO获取请求参数">
</form>

    @RequestMapping("/testPojo")
    public String testPOJO(User user){
        System.out.println(user);
        return "success";
    }

<form th:action="@{/testPojo}" method="post">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    性别：<input type="radio" name="sex" value="男">男<input type="radio" name="sex" value="女">女<br>
    年龄：<input type="text" name="age"><br>
    邮箱：<input type="text" name="email"><br>
    <input type="submit" value="测试通过POJO获取请求参数">
</form>

    <!--配置springMVC的编码过滤器-->
    <filter>
<!--        过滤器名称自定义-->
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
<!--            初始化所需编码，请求编码直接设置-->
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
<!--            只需要设置响应编码，请求编码已经在初始化参数时设置-->
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
<!--        所有请求地址均可用-->
        <url-pattern>/*</url-pattern>
    </filter-mapping>