Spring 参数 List-优快云博客

本文链接：https://blog.youkuaiyun.com/joy_pan/article/details/99302897

本文探讨了在Spring MVC中处理List类型的参数时遇到的问题。错误示例导致异常，解决方案是将List封装到一个对象中。通过正确示例，展示了如何正确传递和接收List参数。

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Spring 参数类型为List

错误的例子：

该写法有如下异常。正确写法为将List再封装成一个对象。

	@PostMapping("/doors")
    public Response addDoors(@RequestBody DoorVO[] doors) {
       // todo batchAddDoors(Lists.newArrayList(doors));
        return new Response(true);
    }

Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.wework.doorservice.core.vo.request.DoorReqVO[] out of START_OBJECT token
 at [Source: java.io.PushbackInputStream@333f2c96; line: 1, column: 1]
	at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)
	at com.fasterxml.jackson.databind.DeserializationContext.reportMappingException(DeserializationContext.java:1234)
	at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1122)
	at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1075)
	at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.handleNonArray(ObjectArrayDeserializer.java:275)
	at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:179)
	at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:20)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3798)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2922)
	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:237)

正确的例子：

	@Getter
	@Setter
	@ToString
	public class BatchAddDoorVO {
	    private List<BatchDoorVO> doors;
	}

	@PostMapping("/doors")
    public Response addDoors(@RequestBody BatchAddDoorVO doors) {
        batchAddDoors(doors.getDoors());
        return new Response(true);
    }