// 處理注冊(cè)請(qǐng)求
@PostMapping("/register/user")
public String register(HttpServletRequest request, HttpSession session, HttpServletResponse resp) {
    // 獲取請(qǐng)求參數(shù)
    // HttpServletRequest\HttpSession\HttpServletResponse 都屬于Servlet API，Spring MVC會(huì)自動(dòng)將它們注入到方法參數(shù)中
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    return "success";
}

@PostMapping("/register/user/2")
public String register2(
        // @RequestParam注解用于將請(qǐng)求參數(shù)綁定到方法參數(shù)上，value屬性指定請(qǐng)求參數(shù)的名稱(chēng),參數(shù)名可以和請(qǐng)求參數(shù)名不同
        // 可以自動(dòng)將請(qǐng)求參數(shù)轉(zhuǎn)換為方法參數(shù)的類(lèi)型，例如將字符串轉(zhuǎn)換為整數(shù)、日期等
        @RequestParam("username") String username,
        @RequestParam("password") String password) {
    return "success";
}

@PostMapping("/register/user/2")
public String register2(
        // @RequestParam注解用于將請(qǐng)求參數(shù)綁定到方法參數(shù)上，value屬性指定請(qǐng)求參數(shù)的名稱(chēng),參數(shù)名可以和請(qǐng)求參數(shù)名不同
        // 可以自動(dòng)將請(qǐng)求參數(shù)轉(zhuǎn)換為方法參數(shù)的類(lèi)型，例如將字符串轉(zhuǎn)換為整數(shù)、日期等
        @RequestParam("username") String username,
        @RequestParam("password") String password,
        @RequestParam(value = "age",required = false,defaultValue = "20") Integer age) {
    return "success";
}

@PostMapping("/register/user/3")
public String register3(String username, String password) {
    // 這種方式要求請(qǐng)求參數(shù)的名稱(chēng)必須與方法參數(shù)的名稱(chēng)一致，Spring MVC會(huì)自動(dòng)將請(qǐng)求參數(shù)綁定到方法參數(shù)上
    return "success";
}

@PostMapping("/register/user/4")
public String register4(User user) {
    // 這種方式要求請(qǐng)求參數(shù)的名稱(chēng)必須與User類(lèi)的屬性名稱(chēng)一致，Spring MVC會(huì)自動(dòng)將請(qǐng)求參數(shù)綁定到User對(duì)象的屬性上
    return "success";
}

@PostMapping("/register/user/4")
public String register4(User user, @RequestHeader(value = "Referer",required = false,defaultValue = "") String referer) {
    return "success";
}

@PostMapping("/register/user/4")
public String register4(User user,
                        @RequestHeader(value = "Referer",required = false,defaultValue = "") String referer,
                        @CookieValue(value = "JSESSIONID",required = false,defaultValue = "") String jsessionId) {
    // 這種方式要求請(qǐng)求參數(shù)的名稱(chēng)必須與User對(duì)象的屬性名稱(chēng)一致，Spring MVC會(huì)自動(dòng)將請(qǐng)求參數(shù)綁定到User對(duì)象的屬性上
    // @RequestHeader注解用于將請(qǐng)求頭信息綁定到方法參數(shù)上，value屬性指定請(qǐng)求頭的名稱(chēng)
    // @CookieValue注解用于將Cookie信息綁定到方法參數(shù)上，value屬性指定Cookie的名稱(chēng)
    return "success";
}

// 這行代碼必須在獲取參數(shù)的代碼之前執(zhí)行，不能寫(xiě)在下面
request.setCharacterEncoding("UTF-8");
String username = request.getParameter("username");

public class CharacterEncodingFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // 設(shè)置請(qǐng)求和響應(yīng)的字符編碼為UTF-8，解決中文亂碼問(wèn)題
        servletRequest.setCharacterEncoding("UTF-8");
        servletResponse.setContentType("text/html;charset=UTF-8");
        // 將請(qǐng)求和響應(yīng)對(duì)象傳遞給下一個(gè)過(guò)濾器或目標(biāo)資源
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

<!--    設(shè)置字符編碼過(guò)濾器，解決post請(qǐng)求中文亂碼問(wèn)題-->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

<!--    使用springmvc提供的字符編碼過(guò)濾器，解決post請(qǐng)求中文亂碼問(wèn)題-->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<!--        設(shè)置字符集為UTF-8-->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
<!--        請(qǐng)求體和響應(yīng)體都使用UTF-8字符集-->
        <init-param>
            <param-name>forceRequestEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

@RequestMapping("/testServletAPI")
public String testServletAPI(HttpServletRequest request) {
    // 將共享數(shù)據(jù)存入request域?qū)ο笾?
    request.setAttribute("testRequestScope", "hello,servletAPI");
    // 這個(gè)跳轉(zhuǎn)視圖默認(rèn)是forward方式，request域?qū)ο笾械臄?shù)據(jù)可以共享到目標(biāo)資源中
    return "ok";
}

<body>
<div th:text="${testRequestScope}"></div>
</body>

@RequestMapping("/testModel")
public String testModel(Model model) {
    // 將共享數(shù)據(jù)存入model中
    model.addAttribute("testRequestScope", "hello,Model");
    return "ok";
}

@RequestMapping("/testMap")
public String testMap(Map<String, Object> map) {
    // 將共享數(shù)據(jù)存入map中
    map.put("testRequestScope", "hello,Map");
    return "ok";
}

@RequestMapping("/testModelMap")
public String testModelMap(ModelMap modelMap) {
    // 將共享數(shù)據(jù)存入modelMap中
    modelMap.addAttribute("testRequestScope", "hello,ModelMap");
    return "ok";
}

@RequestMapping("/testModelAndView")
public ModelAndView testModelAndView(ModelAndView modelAndView) {
    // 將共享數(shù)據(jù)存入modelAndView中
    modelAndView.addObject("testRequestScope", "hello,ModelAndView");
    // 設(shè)置視圖名稱(chēng)
    modelAndView.setViewName("ok");
    return modelAndView;
}

@RequestMapping("/testSessionScope")
public String test(HttpSession session) {
    // 將共享數(shù)據(jù)存入session域?qū)ο笾?
    session.setAttribute("testSessionScope", "hello,Session");
    return "ok";
}

<body>
<div th:text="${session.testSessionScope}"></div>
</body>

@Controller
// @SessionAttributes注解：將指定的屬性存儲(chǔ)到session域?qū)ο笾?
// 表示 將modelMap中key為"x"和"y"的屬性存儲(chǔ)到session域?qū)ο笾?
@SessionAttributes(value = {"x", "y"})
public class SessionScopeTestController {
    @RequestMapping("/testSessionAttribute")
    public String testSessionAttribute(ModelMap modelMap) {
        // 將共享數(shù)據(jù)存入session域?qū)ο笾?
        modelMap.addAttribute("x", "hello,x");
        modelMap.addAttribute("y", "hello,y");
        return "ok";
    }
}