2019独角兽企业重金招聘Python工程师标准>>> 
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
javax.servlet javax.servlet-api 4.0.1 provided
@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
commons-fileupload
commons-fileupload
1.3.2
commons-net
commons-net
1.4.1
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
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!
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