@RequestMapping("/test")
public String test(String username){
	System.out.println("username:" + username);
	return "success";
}

<!-- web.xml -->
<filter>
	<filter-name>CharacterEncodingFilter</filter-name>
	<filter-class>org.springframework.web.filter.characterEncodingFilter</filter-class>
<!-- 设置请求的编码 -->
	<init-param>
		<param-name>encoding</param-name>
		<param-value>UTF-8</param-value>
	</init-param>
<!-- 设置响应的编码 -->
	<init-param>
		<param-name>forceResponseEncoding</param-name>
		<param-value>true</param-value>
	</init-param>
</filter>

@RequestMapping("/testServletAPI")
public String testServletAPI(HttpServletRequest req){
    req.setAttribute("key","value");
    return "success";
}

@RequestMapping("/testModelAndView")
public ModelAndView testModelAndView(){
    /* 
	* ModelAndView有Model和View功能
  	* Model用于向请求域共享数据
	* View用于设置视图，实现页面跳转
	*/
    ModelAndView mav = new ModelAndView();
    // 处理模型数据，即向请求域request共享数据
    mav.addObject("key","value");
    // 设置视图名称
    mav.setViewName("success");
    return mav;
}

@RequestMapping("/testModel")
public String testModel(Model model){
    model.addAttribute("key","value");
    return "success";
}

@RequestMapping("/testMap")
public String testMap(Map<String,Object> map){
    map.put("key","value");
    return "success";
}

@RequestMapping("/testModelMap")
public String testModelMap(ModelMap modelMap){
    model.addAttribute("key","value");
    return "success";
}

@RequestMapping("/testSession")
public String testSession(HttpSession session){
    
    session.addAttribute("key","value");
    
    value = session.getAttribute("key");
    
    // 清除session
    session.invalidate();
    
    return "success";
}

@Controller
public class MyController {
    @RequestMapping("/myPage")
    public String myPage(RedirectAttributes redirectAttributes) {
        String message = "Hello, world!";
        redirectAttributes.addFlashAttribute("message", message);
        return "redirect:/nextPage";
    }
}

@RequestMapping("/testApplication")
public String testApplication(HttpSession session){
    ServletContext application = session.getServletContext();
    application.addAttribute("key","value");
    return "success";
}

return "forward:/path";

return "redirect:/";

<!--
 path: 设置处理的请求地址
 view-name: 设置请求地址所对应的视图名称
-->
<mvc:view-controller path="" view-name=""></mvc:view-controller>

<from method="post">
	<input type="hidden" name="_method" value="put">
</from>

<!--开放对静态资源的访问-->
<mvc:default-servlet-handler />

<!--开启mvc注解驱动-->
<mvc:annotation-driven></mvc:annotation-driven>

// 通过HttpServletResponse响应浏览器数据
@RequestMapping("/testResponse")
public void testResponse(HttpServletResponse resp){
	resp.getWriter().print("hello,response");
}

@RequestMapping("/testResponseBody")
@ResponseBody
public String testResponseBody(){
	return "success";
}

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

// 使用ResponseEntity实现下载文件的功能
@RequestMapping("/testDown")
public ResponseEntity<byte[]> testResponseEntity(HttpSession session){
    // 获取ServletContext对象
    ServletContext servletContext = session.getServletContext();
    // 获取服务器种文件的真实路径
    String realPath = servletContext.getRealPath("/static/img/1.jpg");
    // 创建输入流
    InputStream is = new FileInputStream(realPath);
    // 创建字节数组
    byte[] bytes = new byte[is.available()];
    // 将流读到字节数组中
    is.read(bytes);
    // 创建HttpHeaders对象设置响应头信息
    MultiValueMap<String,String> headers = new HttpHeaders();
    // 设置下载方式和文件名
    headers.add("Content-Disposition"，"attachment;filename=1.jpg");
    // 设置响应状态码
    HttpStatus statusCode = HttpStatus.OK;
    // 创建ResponseEntity对象
    ResponseEntity<byte[]> responseEntity = new ResponseEntity<>(bytes,headers,statusCode);
    // 关闭输入流
    is.close();
    return responseEntity;
}

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
</dependency>
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
</dependency>

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>

<form th:action="@{/testUp}" method="post" enctype="multipart/form-data">
    <input type="file" name="photo">
    <input type="submit" value="上传">
</form>

@RequestMapping("/testUp")
public String testUp(MultipartFile photo，HttpSession session){

    // 获取上传的文件的文件名
    String fileName = photo.getOriginalFilename();
    // 获取上传的文件的后缀名
    String suffixName = fileName.substring(fileName.lastIndexOf("."));	
    // 将UUID作为文件名
    String uuid = UUID.randomUUID().toString();
    // 将uuid和后缀名拼接后的结果作为最终文件名
    fileName = uuid + suffixName;

    // 通过ServletContext获取服务器中photo目录的路径
    ServletContext servletContext = session.getServletContext();
    String photoPath = servletContext.getRealPath("photo");
    File file = new File(photoPath);
    // 判断photoPath对应路径是否存在
    if(!file.exists()){
        // 若不存在，则创建目录
        file.mkdir();
    }
    String finalPath = photoPath + File.separator + fileName;
    photo.transferTo(new File(finalPath));
    return "success";
}

<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="" />
        <mvc:exclude-mapping path="" />
        <!-- 第一种方式 -->
        <!--<bean class="com.xxx.interceptor"></bean>-->
        <!-- 第二种方式 -->
        <!--<ref bean="interceptor"></ref>-->
    </mvc:interceptor>
</mvc:interceptors>