MultipartFile 转 Java对象

依赖alibaba fastjson

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>fastjson</artifactId>
	<version>1.2.60</version>
</dependency>

转换InputStream到String

return new BufferedReader(new InputStreamReader(inputStream))
                .lines().collect(Collectors.joining(System.lineSeparator()));

转换String 到Java对象

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

ObjectMappter objectMappter = new ObjectMappter();
T t = objectMappter.readValue("String", new TypeReference<T>(){
    
    });