3.1 基本类型参数

请求参数和方法的形参 同名即可

springMVC默认可以识别的日期字符串格式为： YYYY/MM/dd HH:mm:ss
通过@DateTimeFormat可以修改默认日志格式

 //网页端输入： http://xxxx/param/test1?id=1&name=shine&gender=true&birth=2020/12/12 12:13:20
    @RequestMapping("/test1")
    public String test1(Integer id, String name, Boolean gender, Date birth){
        System.out.println("test1");
        System.out.println("id:"+id+" name:"+name+" gender:"+gender+" birth:"+birth);
        return "hello";
    }

http://localhost:8080/param/test1?id=1&name=shine&gender=true&birth=2020/12/12%2012:13:20

test1
id:1 name:shine gender:true birth:Sat Dec 12 12:13:20 CST 2020

3.2 实体收参【重点】

请求参数和实体的属性 同名即可
上述使用参数办法如果参数较多不方便，就创建一个实体类承载这些参数

public class User {
	private Integer id;
    private String name;
    private Boolean gender;
    private Date birth;
    private String[] hobby;
	//set/get ...
}

    // http://xxxx/param/test1?id=1&name=shine&gender=true&birth=2020/12/12 12:13:20
    @RequestMapping("/test2")
    public String test2(User user){
        System.out.println("test2");
        System.out.println(user);
        return "hello";
    }

http://localhost:8080/param/test1?id=1&name=shine&gender=true&birth=2020/12/12%2012:13:20

test1
id:1 name:shine gender:true birth:Sat Dec 12 12:13:20 CST 2020

3.3 数组收参

简单类型的 数组

创建表单jsp

<form action="${pageContext.request.contextPath}/param/test3">
        id: <input type="text" name="id"> <br>
        name:<input type="text" name="name"><br>
        gender:<input type="text" name="gender"><br>
        birth:<input type="text" name="birth"><br>
        <input type="checkbox" name="hobby" value="football"> 足球
        <input type="checkbox" name="hobby" value="basketball"> 篮球
        <input type="checkbox" name="hobby" value="volleyball"> 排球 <br>
        <input type="submit" value="提交">
    </form>

    // http://xxxx/param/test3?hobby=football&hobby=basketball&hobby=volleyball
    @RequestMapping("/test3")
//    public String test3(Stirng[] hobby){
    public String test3(User user){
        System.out.println("test3");
        System.out.println(user);
        return "hello";
    }

http://localhost:8080/param.jsp
http://localhost:8080/param/test3?id=1&name=xiaoming&gender=true&birth=2020%2F12%2F20&hobby=football&hobby=basketball

test3
User{id=1, name='xiaoming', gender=true, birth=Sun Dec 20 00:00:00 CST 2020, hobby=[football, basketball]}

3.4 集合收参 【了解】

注意：如果使用集合地址栏输入集合的【】符号时会乱码，需要用表单传递参数

public class UserList {
    public List<User> getUsers() {
        return users;
    }

    public void setUsers(List<User> users) {
        this.users = users;
    }

    private List<User> users;
}

<form action="${pageContext.request.contextPath}/param/test4" method="post">
        id: <input type="text" name="users[0].id"> <br>
        name:<input type="text" name="users[0].name"><br>
        gender:<input type="text" name="users[0].gender"><br>
        <hr>
        id: <input type="text" name="users[1].id"> <br>
        name:<input type="text" name="users[1].name"><br>
        gender:<input type="text" name="users[1].gender"><br>

        <input type="submit" value="提交">
    </form>

// post请求：http://...?users[0].id=1&users[0].name=zhangsan&users[0].birth=2018-12-12&users[1].id=2&....

    // http://xxx/param/test4?users[0].id=1&users[0].name=shine&users[0].gender=true&users[1].id=2&users[1].name=zhangsan
    @RequestMapping("/test4")
    public String test4(UserList userList){
        System.out.println("test4");
        for (User user : userList.getUsers()) {
            System.out.println(user);
        }
        return "hello";
    }

3.5 路径参数

// {id} 定义名为id的路径；【/hello/{id}】的匹配能力和【/hello/*】等价
// http://localhost:8989/.../hello/10   {id}匹配到10
    // {id} 命名路径
    // {id} 等价于* 后面可以写任意符合类型的id  如：/test5/1   test5/2   test5/xxxx
    @RequestMapping("/test5/{id}")
    public String test5(@PathVariable("id") Integer id){
        System.out.println("test5");
        System.out.println("id:"+id);
        return "hello";
    }



    @RequestMapping("/test6/{id}/{name}")
    public String test6(@PathVariable Integer id,@PathVariable("name") String name2){//把{id} 路径匹配到的值赋给name参数
        System.out.println("test6");
        System.out.println("id:"+id);
        System.out.println("name:"+name2);
        return "hello";
    }

http://localhost:8080/param/test5/22
test5
id:22

http://localhost:8080/param/test6/22/xiaoming

test6
id:22
name:xiaoming

3.6 中文乱码

首先，页面中字符集统一

JSP : <%@page  pageEncoding="utf-8" %>
HTML : <meta charset="UTF-8">

其次，tomcat中字符集设置，对get请求中，中文参数乱码有效

Tomcat配置：URIEncoding=utf-8

最后，设置此filter，对post请求中，中文参数乱码有效，
在web.xml中配置过滤器

<!-- 此过滤器会进行：request.setCharactorEncoding("utf-8"); -->
<filter>
    <filter-name>encoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>utf-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>encoding</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>