Java中GET请求与POST请求，前端传参与后端接收实例

矫情吗；* 2023-10-13 08:01 47阅读 0赞

此示例以代码方式展现，可直接结合controller层每个接口上方注释与其接口传递参数方式理解！

前端传参直接就以apiPost工具来代替

> apiPost调用后端接口几种方式

![d4e6c8a8236f4cda97b9e5b6b272e165.png][]

![fdd44018d5014f4cbea1853897c71cad.png][]

![6aaa17406ed747499573a81c59305388.png][]

![e1bed02945d34feba76f4823782062a8.png][]

> 代码：

controller层：

package com.chensir.ceshi.controller;
    
    import com.chensir.ceshi.entity.User;
    import com.chensir.ceshi.service.GetAndPostService;
    import com.chensir.handler.Result;
    import org.springframework.web.bind.annotation.*;
    
    import javax.annotation.Resource;
    import java.util.List;
    
    @RestController
    @RequestMapping("/testGetAndPost")
    public class GetAndPostController {
    
        @Resource
        private GetAndPostService getAndPostService;
    
        /**
         * 1、可查询全部（什么都不传）：http://localhost:8088/testGetAndPost/select1
         * 2、body json方式  值传不过来
         * 3、可 ？拼接（query）：http://localhost:8088/testGetAndPost/select1?sex=男
         * 4、body中form-data 值能传过来 可以查询 x-www-form-urlencoded 值传不过来 不能查询
         *
         */
        @GetMapping("/select1")
        public Result<Object> selectUser(User user) {
            List<User> userList= getAndPostService.selectUser(user);
            return Result.ok(userList);
        }
    
        /**
         * 1、查询全部（什么都不传）提示错误请求：http://localhost:8088/testGetAndPost/select2
         * 2、body json方式：可以查询
         * 3、？拼接（query）提示错误请求：http://localhost:8088/testGetAndPost/select1?sex=男
         * 4、body中form-data、x-www-form-urlencoded 提示错误请求
         *
         */
        @GetMapping("/select2")
        public Result<Object> selectUser1(@RequestBody User user) {
            List<User> userList= getAndPostService.selectUser(user);
            return Result.ok(userList);
        }
    
        /**
         * 1、body json方式：值传不过来 查询为空
         * 3、？拼接（query）可以查询：http://localhost:8088/testGetAndPost/select1?name=张三
         * 4、body中form-data：可以查询; x-www-form-urlencoded：值传不过来 查询为空
         *
         */
        @GetMapping("/select3")
        public Result<Object> selectUser2(String name) {
            List<User> userList= getAndPostService.selectUserByName(name);
            return Result.ok(userList);
        }
    
        /**
         * 1、body json方式：提示错误请求
         * 3、？拼接（query）可以查询：http://localhost:8088/testGetAndPost/select1?name=张三
         * 4、body中form-data：可以查询; x-www-form-urlencoded：提示错误请求
         *
         */
        @GetMapping("/select4")
        public Result<Object> selectUser3(@RequestParam String name) {
            List<User> userList= getAndPostService.selectUserByName(name);
            return Result.ok(userList);
        }
    
        /**
         * 1、只能以这样的方式：http://localhost:8088/testGetAndPost/selectUser/张三
         *
         */
        @GetMapping("/selectUser/{name}")
        public Result<Object> selectUser4(@PathVariable("name") String name) {
            List<User> userList= getAndPostService.selectUserByName(name);
            return Result.ok(userList);
        }
    
        /**
         * 和select3一样
         *
         */
        @GetMapping("/select5")
        public Result<Object> selectUser5(String name,Integer age) {
            List<User> userList= getAndPostService.selectUserByName1(name,age);
            return Result.ok(userList);
        }
    
        /**
         * 和select4一样
         *
         */
        @GetMapping("/select6")
        public Result<Object> selectUser6(@RequestParam("name") String name,@RequestParam("age") Integer age) {
            List<User> userList= getAndPostService.selectUserByName1(name,age);
            return Result.ok(userList);
        }
    
        /**
         * 1、只能以这样的方式：http://localhost:8088/testGetAndPost/selectUser/张三/18
         *
         */
        @GetMapping("/selectUser/{name}/{age}")
        public Result<Object> selectUser7(@PathVariable("name") String name,@PathVariable("age") Integer age) {
            List<User> userList= getAndPostService.selectUserByName1(name,age);
            return Result.ok(userList);
        }
    
        /**
         * 1、body json方式：值传不过来
         * 3、？拼接（query）值能传来，能新增：http://localhost:8088/testGetAndPost/select1?name=张三&age=18
         * 4、body中form-data、x-www-form-urlencoded：值都能传来，都可以新增
         *
         */
        @PostMapping("/add1")
        public Result<Object> addUser(User user){
            String msg=getAndPostService.addUser(user);
            return Result.ok(msg);
        }
    
        /**
         * 只能以body json
         *
         */
        @PostMapping("/add2")
        public Result<Object> addUser1(@RequestBody User user){
            String msg=getAndPostService.addUser(user);
            return Result.ok(msg);
        }
    
        /**
         * 1、body json方式：值传不过来
         * 3、？拼接（query）值能传来，能新增：http://localhost:8088/testGetAndPost/select1?name=张三
         * 4、body中form-data、x-www-form-urlencoded：值都能传来，都可以新增
         *
         */
        @PostMapping("/add3")
        public Result<Object> addUser2(@RequestParam("name") String name){
            String msg=getAndPostService.addUserName(name);
            return Result.ok(msg);
        }
    
        /**
         * 只能以 http://localhost:8088/testGetAndPost/selectUser/张三
         *
         */
        @PostMapping("/add4/{name}")
        public Result<Object> addUser3(@PathVariable("name") String name){
            String msg=getAndPostService.addUserName(name);
            return Result.ok(msg);
        }
    }

service层：

public interface GetAndPostService {
        List<User> selectUser(User user);
    
        List<User> selectUserByName(String name);
    
        List<User> selectUserByName1(String name, Integer age);
    
        String addUser(User user);
    
        String addUserName(String name);
    }
    
    
    
    
    
    @Service
    public class GetAndPostServiceImpl implements GetAndPostService {
    
        @Resource
        private GetAndPostMapper getAndPostMapper;
    
    
        @Override
        public List<User> selectUser(User user) {
            System.out.println(user.getName());
            return getAndPostMapper.selectUserList(user);
        }
    
        @Override
        public List<User> selectUserByName(String name) {
            return getAndPostMapper.selectUserByName(name);
        }
    
        @Override
        public List<User> selectUserByName1(String name, Integer age) {
            return getAndPostMapper.selectUserByName1(name,age);
        }
    
        @Override
        public String addUser(User user) {
            if (user==null){
                return "user为空";
            }
            int insert = getAndPostMapper.insert(user);
            return insert>0?"ok":"false";
        }
    
        @Override
        public String addUserName(String name) {
            if (name==null){
                return "name为空";
            }
            User user= User.builder()
                    .name(name)
                    .build();
            int insert = getAndPostMapper.insert(user);
            return insert>0?"ok":"false";
        }
    }

mapper层：

public interface GetAndPostMapper extends BaseMapper<User> {
    
        List<User> selectUserList(@Param("query") User user);
    
        List<User> selectUserByName(String name);
    
        List<User> selectUserByName1(String name, Integer age);
    }

xml：

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.chensir.ceshi.mapper.GetAndPostMapper">
    
        <select id="selectUserList" resultType="com.chensir.ceshi.entity.User">
            select * from user
            where 1=1
            <if test="query.name != null and query.name != ''">
                and name = #{query.name}
            </if>
            <if test="query.age != null">
                and age = #{query.age}
            </if>
            <if test="query.sex != null and query.sex != ''">
                and sex = #{query.sex}
            </if>
        </select>
        <select id="selectUserByName" resultType="com.chensir.ceshi.entity.User">
            select * from user where name=#{name}
        </select>
        <select id="selectUserByName1" resultType="com.chensir.ceshi.entity.User">
            select * from user where name=#{name} and age=#{age}
        </select>
    </mapper>

[d4e6c8a8236f4cda97b9e5b6b272e165.png]: https://img-blog.csdnimg.cn/d4e6c8a8236f4cda97b9e5b6b272e165.png
[fdd44018d5014f4cbea1853897c71cad.png]: https://img-blog.csdnimg.cn/fdd44018d5014f4cbea1853897c71cad.png
[6aaa17406ed747499573a81c59305388.png]: https://img-blog.csdnimg.cn/6aaa17406ed747499573a81c59305388.png
[e1bed02945d34feba76f4823782062a8.png]: https://img-blog.csdnimg.cn/e1bed02945d34feba76f4823782062a8.png