文章目录

  • SpringBoot Controller获取请求参数
  • Get方法
  • 1.参数在路径中
  • 2.参数在?后
  • 3.map
  • 4.数组
  • 5.对象
  • 5.1单对象
  • 5.2多对象
  • Post方法
  • 1.form表单
  • 1.1).map
  • 1.2).数组
  • 1.3).对象(重点)
  • 1.4).多对象
  • 2.字符串文本
  • 3.json格式-使用对象接收(重点)


SpringBoot Controller获取请求参数

总结了一些常用的get post请求的参数，结合了一些小demo，方便理解。

Get方法

1.参数在路径中

restful风格的url(啥叫restful? 查询用get,新增post,修改put,删除delete)

http://localhost:8080/hello/qwl

代码

package com.qwl.getpost.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GetController {
    /**
     *restful查询请求
     * @param name
     * @return
     */
    @GetMapping("/hello/{name}")
    public String getHello(@PathVariable("name") String name){
        return "hello!"+name;
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_spring boot添加请求参数

2.参数在?后

url

http://localhost:8080/hello?name=qwl

代码

package com.qwl.getpost.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GetController {
    /**
     *写在问号后的请求
     * @param name
     * @return
     */
    @GetMapping("/hello")
    public String getHello1(@RequestParam("name") String name){
        return "hello----"+name;
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_springmvc_02


无参传递会报错，记得加 required = false

url

http://localhost:8080/hello

代码

@RestController
public class GetController {
    /**
     *无参不报错
     * @param name
     * @return
     */
    @GetMapping("/hello")
    public String getHello1(@RequestParam(name="name",required = false) String name){
        return "hello----"+name;
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_spring boot_03


无参传递可以赋默认值，加上 defaultValue = "阿猫阿狗"

url

http://localhost:8080/hello

代码

package com.qwl.getpost.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GetController {
    /**
     *无参赋默认值
     * @param name
     * @return
     */
    @GetMapping("/hello")
    public String getHello1(@RequestParam(name="name",defaultValue = "阿猫阿狗") String name){
        return "hello----"+name;
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_spring_04

3.map

url

http://localhost:8080/helloMap?name=qwl&age=24

代码

package com.qwl.getpost.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
public class GetController {
    /**
     * map接收参数
     * @param map
     * @return
     */
    @GetMapping("/helloMap")
    public String getHelloMap(@RequestParam Map<String,String> map){
        return "大家好，我叫："+map.get("name")+"!今年"+map.get("age")+"岁了~";
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_spring_05

4.数组

url

http://localhost:8080//helloArr?name=qwl&name=uzi&name=theShy

代码

package com.qwl.getpost.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
public class GetController {

    /**
     * 数组接收参数
     * @param nameArr
     * @return
     */
    @GetMapping("/helloArr")
    public String getHelloArr(@RequestParam("name") String[] nameArr){
        String str = "";
        for (String s : nameArr) {
            str += s + "、";
        }
        return "表扬以下同学："+str;
    }
 }

结果

spring boot添加请求参数 spring boot获取请求参数_java_06

5.对象

5.1单对象

url

http://localhost:8080//helloEntity?name=qwl&age=24

代码
-新建学生类

package com.qwl.getpost.entity;

public class Student {
    /**
     * 姓名
     */
    private String name;
    /**
     * 年龄
     */
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

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

-controller

package com.qwl.getpost.controller;

import com.qwl.getpost.entity.Student;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
public class GetController {

    /**
     * 单对象接收参数
     * @param student
     * @return
     */
    @GetMapping("/helloEntity")
    public String getHelloEntity(Student student){
        return "大家好，我叫"+student.getName()+",今年"+student.getAge()+"岁";
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_spring_07

5.2多对象

url

http://localhost:8080//helloEntites?name=qwl&age=24&phoneName=华为&phoneNumber=15333333333

代码
-新建手机类

package com.qwl.getpost.entity;

public class Phone {
    /**
     * 手机名称
     */
     private String phoneName;
    /**
     * 手机号码
     */
    private String phoneNumber;

    public String getPhoneName() {
        return phoneName;
    }

    public void setPhoneName(String phoneName) {
        this.phoneName = phoneName;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }
}

-controller

package com.qwl.getpost.controller;

import com.qwl.getpost.entity.Phone;
import com.qwl.getpost.entity.Student;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
public class GetController {


    @GetMapping("/helloEntites")
    public String getHelloEntites(Student student, Phone phone){
        return "大家好，我叫"+student.getName()+",今年"+student.getAge()+"岁！" +
                "我用的这款手机是："+phone.getPhoneName()+",我的手机号是："+phone.getPhoneNumber();
    } 
}

结果

spring boot添加请求参数 spring boot获取请求参数_spring boot添加请求参数_08

Post方法

这里统一使用postman进行测试

1.form表单

1.1).map

url

localhost:8080//postByHelloMap

代码

package com.qwl.getpost.controller;

import com.qwl.getpost.entity.Phone;
import com.qwl.getpost.entity.Student;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

@RestController
public class GetController {
    /**
     * post，formData用map接收参数
     * @param map
     * @return
     */
    @PostMapping("/postByHelloMap")
    public String postByHelloMap(@RequestParam Map<String,String> map){
        return "大家好，我叫："+map.get("name")+",今年："+map.get("age")+"岁了";
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_java_09

1.2).数组

url

localhost:8080//postByHelloArr

代码

package com.qwl.getpost.controller;

import com.qwl.getpost.entity.Phone;
import com.qwl.getpost.entity.Student;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

@RestController
public class GetController {

    /**
     * post，formData用数组接收参数
     * @param nameArr
     * @return
     */
    @PostMapping("/postByHelloArr")
    public String postByHelloArr(@RequestParam("name") String[] nameArr){
        String str = "";
        for (String name : nameArr) {
            str += name + ",";
        }
        return str+"祝大家新年快乐";
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_spring boot_10

1.3).对象(重点)

url

localhost:8080//postByEntity

代码

package com.qwl.getpost.controller;

import com.qwl.getpost.entity.Phone;
import com.qwl.getpost.entity.Student;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

@RestController
public class GetController {
    /**
     * post，formData用对象接收参数
     * @param student
     * @return
     */
    @PostMapping("/postByEntity")
    public String postByEntity(Student student){
        return "大家好，我叫："+student.getName()+",今年："+student.getAge()+"岁了";
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_java_11

1.4).多对象

url

localhost:8080//postByEntities

代码

package com.qwl.getpost.controller;

import com.qwl.getpost.entity.Phone;
import com.qwl.getpost.entity.Student;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

@RestController
public class GetController {
    /**
     * post，formData用多对象接收参数
     * @param student
     * @return
     */
    @PostMapping("/postByEntities")
    public String postByEntities(Student student,Phone phone){
        return "大家好，我叫："+student.getName()+",今年："+student.getAge()+"岁了,我的手机号是"+phone.getPhoneNumber();
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_java_12

2.字符串文本

text文本可通过HttpServletRequest获取输入流再接收文本内容
url

localhost:8080//postByText

代码

package com.qwl.getpost.controller;

import com.qwl.getpost.entity.Phone;
import com.qwl.getpost.entity.Student;
import org.springframework.web.bind.annotation.*;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Map;

@RestController
public class GetController {
    /**
     * 文本接收
     *
     * @param request
     * @return
     */
    @PostMapping("/postByText")
    public String postByText(HttpServletRequest request) {
        ServletInputStream is = null;
        try {
            is = request.getInputStream();
            StringBuilder sb = new StringBuilder();
            byte[] buf = new byte[1024];
            int len = 0;
            while ((len = is.read(buf)) != -1) {
                sb.append(new String(buf, 0, len));
            }
            return "文本：" + sb.toString();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_spring boot添加请求参数_13

3.json格式-使用对象接收(重点)

url

localhost:8080//postByJsonEntity

代码

package com.qwl.getpost.controller;

import com.qwl.getpost.entity.Phone;
import com.qwl.getpost.entity.Student;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

@RestController
public class GetController {
    /**
     * post，json格式，对象接收参数
     * @param student
     * @return
     */
    @PostMapping("/postByJsonEntity")
    public String postByJsonEntity(@RequestBody Student student){
        return "大家好，我叫："+student.getName()+",今年："+student.getAge()+"岁了";
    }
}

结果

spring boot添加请求参数 spring boot获取请求参数_spring boot_14