http://localhost:8080/ProjectName/user/login.do
"<%=request.getContextPath()%>/user/login.do" method="post"> username:"text" name="username"> password:"text" name="password"> age:"text" name="age"> "submit" value="提交">
HttpServeletRequest
spring
@RequestMapping(value="/login.do") public String login(HttpServletRequest request,HttpServletResponse response){ String username=request.getParameter("username"); String password=request.getParameter("password"); int age=Integer.parseInt(request.getParameter("age")); //转换类型 System.out.println(username+"--->"+password); return "success"; }
name
@RequestMapping(value = "/login.do") public String login(String username,String password,Integer age) { System.out.println(username + "--->" + password+"----->"+age); return "success"; }
@RequestParam
required
false
/** * 使用@RequestParam获取请求参数 * @RequestParam()中的value属性为form表单中对应的name属性 * 自动转换数据类型,只需要定义方法参数为所需的数据类型即可,spring会为我们自动转换 */ @RequestMapping(value = "/login.do") public String login(@RequestParam(value = "username") String name, @RequestParam("password") String pwd,@RequestParam("age") Integer age) { System.out.println(name + "--->" + pwd+"----->"+age); return "success"; }
value
true
defaultValue
required=false
null
int
Integer
/* * 这里的获取请求参数中的username,age的值 * 其中username的这个注解默认的是required=true,因此这个是不可以没有的 * age的这个注解设置了required=false,表示可以没有这个参数,但是如果没有这个参数,那么默认的是null,但是int类型的没有null,因此也会是报错的,有两种解决方式: * 1) 通过defalutValue设置其默认的值 * 2) 如果我们就想要设其为null,可以使用封装类Integer类型即可 */ @RequestMapping(value = "/testRequestParams") public String testRequestParams(@RequestParam(value="username") String username,@RequestParam(value="age",required=false) int age) { System.out.println("username,age "+ username+" , "+age); return SUCCESS; }
JavaBean
set
public class User { private String username; private String password; private int age; public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String toString() { return "User [username=" + username + ", password=" + password + "]"; } }
UserController
login
@RequestMapping(value = "/login.do") public String login(User user) { System.out.println(user); return "success"; }
/** * 混合使用案例 */ @RequestMapping(value = "/login.do") public String login(User user,@RequestParam("gender")String gender) { System.out.println(user); return "success"; }
HttpServletRequest
Springmvc之接受请求参数二