1. 表单数据

后台直接用形参来接收表单的name。一一对应

@Controller
public class TestController {@RequestMapping(value="addUser.do",method= RequestMethod.POST)public String postTest2(String age,String userName){System.out.print("\n\n userName = "+userName);System.out.print("\n\n age = "+age);return "redirect:/html/TEST2.html";}}

或者带有注解(这样可以当做转义变量!)：

 @RequestMapping(value="addUser.do",method= RequestMethod.POST)public String postTest2(@RequestParam("userName") String userName22, @RequestParam("age") Integer age33){System.out.print("\n\n userName22 = "+userName22);System.out.print("\n\n age33 = "+age33);return "redirect:/html/TEST2.html";}

又或者使用HttpServletRequest类对象来接收!

但是要添加对应maven依赖

<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>4.0.1</version><scope>provided</scope>
</dependency>

 @RequestMapping(value="addUser.do",method= RequestMethod.POST)public String postTest2(@RequestParam("userName") String userName22, @RequestParam("age") Integer age33,HttpServletRequest request){System.out.print("\n\n userName22 = "+userName22);System.out.print("\n\n age33 = "+age33);String username=request.getParameter("userName");String password=request.getParameter("age");System.out.println("\n\nusername is:"+username);System.out.println("\n\npassword is:"+password);return "redirect:/html/TEST2.html";}

@RequestMapping(value="addUser.do",method= RequestMethod.POST)public String postTest2(HttpServletRequest request){String username=request.getParameter("userName");String password=request.getParameter("age");System.out.println("\n\nusername is:"+username);System.out.println("\n\npassword is:"+password);return "redirect:/html/TEST2.html";}

或者这样：接收到时用&拼接的字符串...：str is:userName=11&age=222

@RequestMapping(value="addUser.do",method= RequestMethod.POST)public String postTest2(@RequestBody String str){System.out.println("\n\nstr is:"+str);return "redirect:/html/TEST2.html";}

或者一个对象bean类来接收（但不能用@RequestBody来注释）：

@RequestMapping(value="addUser.do",method= RequestMethod.POST)public String postTest2(Stu stu){System.out.println("\n\nstu is:"+stu);System.out.println("\n\nstu is:"+stu.getUserName());System.out.println("\n\nstu is:"+stu.getAge());return "redirect:/html/TEST2.html";}

2. 文件上传(multipart)

A. 首先添加maven依赖包

<dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.2</version></dependency><dependency><groupId>commons-net</groupId><artifactId>commons-net</artifactId><version>1.4.1</version></dependency>

B.然后在bean的配置文件(applicationContext.xml或者dispatcher-servlet.xml...配置文件都可以)中，添加<bean>配置如下：

<!--上传文件--><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>

C. 前端:必须给form声明为：enctype="multipart/form-data"  然后带有一个file类型的input!注意属性name和变量对应关系!

<form enctype="multipart/form-data" action="addUser.do" method="post"><input type="file" name="file"><input type="submit" value="上传" />
</form>

D.后台使用MultipartFile类来接收!并来解析

也可以使用@RequestPart注解，并使用byte[]来接收二进制，或者用Part类对象接收。三种形式来接收都可以!

@RequestMapping(value="addUser.do",method= RequestMethod.POST)public String postTest2(@RequestParam("file") MultipartFile file){System.out.println("\n\nage file = :"+file.getOriginalFilename());return "redirect:/html/TEST2.html";}

PS.当然可以支持多个文件同时上传并设置上传最大容量的阈值l

E.限定上传文件大小

 <!--上传文件--><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><property name="maxUploadSize" value="1000000"></property></bean>

3. 发送头部数据