springboot接收参数from 表单，json等

1.新建项目

1. 建立项目如下：

2. pom 依赖如下

      <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.51</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

3.vo 中User 类

import lombok.Data;

@Data
public class User {
    private String username;
    private String id;
}

二：Controller接收form 表单

1.form 表单转对象，转map，与字符串方式接收

@Controller
@Slf4j
public class FormController {
    @RequestMapping("/formToObj")
    @ResponseBody
    /**
     * form 转java 类
     */
    public String formToObj(User user){

        log.info(JSON.toJSONString(user));
        return JSON.toJSONString(user);
    }
    @RequestMapping("/formToMap")
    @ResponseBody
    /**
     * form 转Map<String,String>
     */
    public String formToMap(@RequestParam Map<String,String> user){

        log.info(JSON.toJSONString(user));
        return JSON.toJSONString(user);
    }
    @RequestMapping("/formString")
    @ResponseBody
    /**
     * form 用String 接收
     * defaultValue 设置默认值
     */
    public String formString(@RequestParam(value = "username",defaultValue = "ambity") String username){

        log.info(username);
        return username;
    }
}

三 Controller 接收json

@RestController
@Slf4j
public class JsonController {
    @RequestMapping(value = "/jsonToObj" ,consumes={MediaType.APPLICATION_JSON_VALUE},produces = {MediaType.APPLICATION_JSON_VALUE})
    @ResponseBody
    /**
     * form 转java 类
     */
    public String formToObj(@RequestBody User user){

        log.info(JSON.toJSONString(user));
        return JSON.toJSONString(user);
    }
    @RequestMapping("/jsonToMap")
    @ResponseBody
    /**
     * form 转java 类
     */
    public String jsonToMap(@RequestBody Map<String,String> user){

        log.info(JSON.toJSONString(user));
        return JSON.toJSONString(user);
    }
}