https://www.cnblogs.com/zc-blog-com/p/13360027.html.
@RestController
public class HelloController {
// @ResponseBody//将方法的返回值以json字符串的形式进行返回
@RequestMapping("/hello.do")
public String action() {
System.out.println(123);
return "null";
}
}
<body>
<form action="/hello.do" method="get">
姓名：<input type="text" name="username">
密码：<input type="password" name="password">
<input type="submit" value="提交">
</form>
</body>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
@RestController
public class HelloController {
// @ResponseBody//将方法的返回值以json字符串的形式进行返回
@RequestMapping("hello.do")
public String action(HttpServletRequest request) {
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println(username+ " "+password);
return null;
}
}
username和password要和HTML里面的名字一样
@RequestMapping("hello1.do")
//通过反射，匹配参数名来注入值
//java反射机制本身会注入失败，使用@RequestParam来解决。当有多个参数时，发现某个参数接收不到，可以试试这个注解
public String action1(@RequestParam ("username")String username, String password) {
System.out.println(username+ " "+password);
return null;
}
}
<form action="/hello1.do" method="get">
姓名：<input type="text" name="username">
密码：<input type="password" name="password">
<input type="submit" value="提交1">
</form>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
这时User就会自动生成set，get方法
//针对参数比较多时
@RequestMapping("hello2.do")
//通过反射，匹配参数名来注入值
public String action2(User user) {
System.out.println(user);
return null;
}
<form action="/hello2.do" method="get">
姓名：<input type="text" name="username">
密码：<input type="password" name="password">
<input type="submit" value="提交2">
</form>
https://blog.csdn.net/weixin_30765319/article/details/95006250
以上均为转载，自己学习记录，侵权立删