<form action="/user/save1.do" method="post">
    姓名：<input type="text" name="username" />

    年齡：<input type="text" name="age" />

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

@RequestMapping("/save1.do")
public String save(String username, Integer age) {
    System.out.println("姓名："+username + "，年齡："+age);
    return "suc"; // 跳轉(zhuǎn)成功頁面
}

public class User {
    private String username;
    private Integer age;
    // 無參構(gòu)造（默認(rèn)生成，顯式聲明更規(guī)范）
    public User() {}
    // getter/setter 方法
    public String getUsername() { return username; }
    public void setUsername(String username) { this.username = username; }
    public Integer getAge() { return age; }
    public void setAge(Integer age) { this.age = age; }
    // toString 便于打印對象
    @Override
    public String toString() {
        return "User{username='" + username + "', age=" + age + "}";
    }
}

@RequestMapping("/save2.do")
public String save2(User user) {
    System.out.println("user對象："+user);
    return "suc";
}

// 地址實(shí)體
public class Address {
    private Double money; // 金額
    // getter/setter/toString 省略
}
// 用戶實(shí)體（包含 Address 屬性）
public class User {
    private String username;
    private Address address; // 嵌套引用類型
    // getter/setter/toString 省略
}

<form action="/user/save3.do" method="post">
    姓名：<input type="text" name="username" /><br/>
    金額：<input type="text" name="address.money" /><br/>
    <input type="submit" value="提交" />
</form>

@RequestMapping("/save3.do")
public String save3(User user) {
    System.out.println("user對象（含地址）："+user);
    return "suc";
}

public class User {
    private String username;
    private List<Address> list; // 地址集合
    // getter/setter/toString 省略
}

<form action="/user/save4.do" method="post">
    姓名：<input type="text" name="username" /><br/>
    地址1金額：<input type="text" name="list[0].money" /><br/>
    地址2金額：<input type="text" name="list[1].money" /><br/>
    <input type="submit" value="提交" />
</form>

@RequestMapping("/save4.do")
public String save4(User user) {
    System.out.println("user對象（含List）："+user);
    return "suc";
}

public class User {
    private String username;
    // 指定日期格式為 yyyy-MM-dd
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private Date birthday;
    // getter/setter/toString 省略
}

package springmvc; // 包名替換為 springmvc
import org.springframework.core.convert.converter.Converter;
import java.text.SimpleDateFormat;
import java.util.Date;
public class StringToDate implements Converter<String, Date> {
    @Override
    public Date convert(String s) {
        if (s == null || s.isEmpty()) {
            return null; // 處理空值
        }
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        try {
            return sdf.parse(s);
        } catch (Exception e) {
            throw new RuntimeException("日期轉(zhuǎn)換失?。? + e.getMessage());
        }
    }
}

<!-- 配置類型轉(zhuǎn)換服務(wù) -->
<bean id="conversionService" 
      class="org.springframework.context.support.ConversionServiceFactoryBean">
    <property name="converters">
        <set>
            <!-- 注冊自定義轉(zhuǎn)換器 -->
            <bean class="springmvc.StringToDate" />
        </set>
    </property>
</bean>
<!-- 啟用注解驅(qū)動，并指定自定義轉(zhuǎn)換服務(wù) -->
<mvc:annotation-driven conversion-service="conversionService"/>

@RequestMapping("/save6.do")
public String save6(HttpServletRequest request, HttpServletResponse response) {
    // 1. 獲取會話對象
    HttpSession session = request.getSession();
    System.out.println("request：" + request + "，session：" + session);
    // 2. 獲取單個參數(shù)（手動轉(zhuǎn)換類型）
    String username = request.getParameter("username");
    String ageStr = request.getParameter("age");
    Integer age = ageStr != null ? Integer.parseInt(ageStr) : null;
    System.out.println("姓名：" + username + "，年齡：" + age);
    // 3. 獲取多值參數(shù)（如 checkbox）
    String[] hobbies = request.getParameterValues("hobby");
    System.out.println("愛好：" + Arrays.toString(hobbies));
    // 4. 獲取所有參數(shù)（封裝為 Map）
    Map<String, String[]> paramMap = request.getParameterMap();
    paramMap.forEach((key, value) -> {
        System.out.println("參數(shù)名：" + key + "，參數(shù)值：" + Arrays.toString(value));
    });
    return "suc";
}

<form action="/user/save6.do" method="post">
    姓名：<input type="text" name="username" /><br/>
    年齡：<input type="text" name="age" /><br/>
    愛好：<input type="checkbox" name="hobby" value="籃球" />籃球
          <input type="checkbox" name="hobby" value="游戲" />游戲
          <input type="checkbox" name="hobby" value="看書" />看書<br/>
    <input type="submit" value="提交" />
</form>

<!-- 中文亂碼過濾器 -->
<filter>
    <filter-name>characterEncodingFilter</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>
    <!-- 強(qiáng)制響應(yīng)編碼（可選） -->
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern> <!-- 攔截所有請求 -->
</filter-mapping>