springMVC 获取参数

1.servlet

@GetMapping("/params")
public String test5(HttpServletRequest request){
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    System.out.println(username + " " + password);
    return "test6";
}

2 通过控制器形参获取参数

@GetMapping("/params2")
public String test6(String username,String password){
    System.out.println(username + " " + password);
    return "test6";
}

3 RequestParam

@GetMapping("/params3")
public String test7(@RequestParam(value = "username" ,required = false,defaultValue = "jack") String username,String password){
    System.out.println(username + " " + password);
    return "test6";
}

4 RequestHeader

设置了defaultValue 没有值即为默认值

@GetMapping("/params3")
public String test7(
        @RequestParam(value = "username" ,required = false,defaultValue = "jack") String username,String password
        ,@RequestHeader(value = "haha",defaultValue = "valuehaha") String host){
    System.out.println(username + " " + password);
    System.out.println("host:"+ host);
    return "test6";
}

 5 CookieValue

cookie的生命周期为浏览器关闭才结束

public String test5(HttpServletRequest request){
    HttpSession session = request.getSession();
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    System.out.println(username + " " + password);
    return "test6";
}

 

 

@GetMapping("/params3")
public String test7(
        @RequestParam(value = "username" ,required = false,defaultValue = "jack") String username,String password,
        @RequestHeader(value = "haha",defaultValue = "valuehaha") String host,
        @CookieValue("JSESSIONID") String cookie
        ){
    System.out.println(username + " " + password);
    System.out.println("host:"+ host);
    System.out.println("cookie:" + cookie);
    return "test6";

 

6 通过实体类型pojo获取参数

 

package com.cj.mvc.bean;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

public class User {
    private String username;
    private Integer age;
    private String sex;

    public User() {
    }

    public User(String username, Integer age, String sex) {
        this.username = username;
        this.age = age;
        this.sex = sex;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "username='" + username + '\'' +
                ", age=" + age +
                ", sex='" + sex + '\'' +
                '}';
    }


}

 

@RequestMapping("/testBean")
public String testBean(User user){
    System.out.println(user);
    return "test1";
}

解决乱码