springboot项目中使用JOSN解析库的方法

{“name”:“sun”}
{
“name”:“sun”,
“age”:22
}
{“arr”:[1,2,3,4]}
{“people”:{“id”:111,“name”:“sun”,“age”:22}}

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.9</version>
        </dependency>

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.5.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.mr</groupId>
    <artifactId>_20250603spring_fastjson</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>20250603spring_fastjson</name>
    <description>20250603spring_fastjson</description>
    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.9</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

package com.mr._20250603spring_fastjson;
import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.HashMap;
import java.util.Map;
@RestController
public class Controller {
Bean bean = new Bean("sun",22);
//    @GetMapping
    @RequestMapping("/login")
    public String login(@RequestBody String json){
        Map loginDate = JSON.parseObject(json, Map.class);
        String username = loginDate.get("username").toString();
        String password = loginDate.get("password").toString();
        Map<String,String> result = new HashMap<>();
        String code = "";
        String msg = "";
        if ("mr".equals(username) && "123".equals(password)){
            code = "200";
            msg = "登录成功";
        }else {
            code = "500";
            msg = "账号或密码错误";
        }
        result.put("code",code);
        result.put("msg",msg);
        return JSON.toJSONString(result);
//        System.out.println("wdwdwdw");
//        System.out.println("bean"+bean);
//        String str = JSON.toJSONString(bean);
//        System.out.println("bean_json"+ str);
//        return  str;
    }
}