SpringMVC详解如何映射请求数据

@Controller
@RequestMapping(value = "/vote")
public class VoteHandler {
     
    @RequestMapping(value = "/vote01")
    public String test01(@RequestParam(value = "name")String userName){
        System.out.println("userName = "+userName);
        return "success";
    }
}

<h2>获取到超链接参数值</h2>
<hr/>
<a href="vote/vote01?name=hsp">获取超链接的参数</a>

@RequestMapping(value = "/vote02")
public String test02(@RequestHeader("Accept-Encoding") String ae,
                     @RequestHeader("Host") String host) {
    System.out.println("Accept-Encoding= " + ae);
    System.out.println("Host= " + host);
    //返回到一个结果
    return "success";
}

<h1>获取到消息头</h1>
<hr>
<a href="vote/vote02">获取http消息头信息</a>

public class Pet {
    private Integer id;
    private String name;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        return "Pet{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

public class Master {
    private Integer id;
    private String name;
    //对象的属性是另外一个对象[涉及级联]
    private Pet pet;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Pet getPet() {
        return pet;
    }
    public void setPet(Pet pet) {
        this.pet = pet;
    }
    @Override
    public String toString() {
        return "Master{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pet=" + pet +
                '}';
    }
}

@RequestMapping(value = "/vote03")
public String test03(Master master) {
    System.out.println("master=" + master);
    //返回结果
    return "success";
}

<!--
1. 这是一个表单，表单的数据对应Master对象
2. 提交的数据参数名和对象的字段名一致即可
-->
<fORM action="vote/vote03" method="post">
    主人号:<input type="text" name="id"><br>
    主人名:<input type="text" name="name"><br>
    宠物号:<input type="text" name="pet.id"><br>
    宠物名:<input type="text" name="pet.name"><br>
    <input type="submit" value="添加主人和宠物">
</form>

<!--在使用springmvc过程中接收客户端的请求参数时有时会出现中文乱码,这是因为springmvc并没有对象请求参数进行编码控制,如果需要控制需要自行指定-->
<filter>
    <filter-name>charset</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>

@RequestMapping(value = "/vote04")
public String test04(httpservletRequest request,
                     HttpServletResponse response,
                     HttpSession hs) {
    //获取到session
    //servlet原生的方式
    HttpSession session = request.getSession();
    System.out.println("session=" + session);
    //注意:通过参数传入的 hs 和 通request.getSession() 得到的对象是
    //同一个
    System.out.println("hs= " + hs);
    String username = request.getParameter("username");
    String pwd = request.getParameter("pwd");
    System.out.println("username= " + username);
    System.out.println("pwd= " + pwd);
    //返回结果
    return "success";
}

<hr>
<h1>演示 servlet api的使用 </h1>
<form action="vote/vote04" method="post">
    用户名:<input type="text" name="username"><br>
    密　码:<input type="passWord" name="pwd"><br>
    <input type="submit" value="添加用户">
</form>