【用户中心】写完Delete接口，想测试传入json，报错了,解决方法

删除接口

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text
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@PostMapping("/delete")
public BaseResponse<Boolean> deleteUser(@RequestBody Long id, HttpServletRequest request) {
if (!isAdmin(request)) {
throw new BusinessException(ErrorCode.NO_AUTH);
}
if (id <= 0) {
throw new BusinessException(ErrorCode.PARAMS_ERROR);
}
boolean b = userService.removeById(id);
return ResultUtils.success(b);
}

传参

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POST
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Content-Type: application/json

{
"id": 2
}

返回的信息：

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{
"code": 50000,
"data": null,
"message": "JSON parse error: Cannot deserialize value of type `long` from Object value (token `JsonToken.START_OBJECT`); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `long` from Object value (token `JsonToken.START_OBJECT`)\n at [Source: (org.springframework.util.StreamUtils$NonClosingInputStream); line: 1, column: 1]",
"description": ""
}

问题解决，codegeex给的方法，问了三四遍终于吐出了正解 方法就是，新建一个类来转换值

1、添加依赖jackson-databind

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<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.3</version>
</dependency>

2，新建一个转换器类，来单独处理Long类型的解析

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package com.yang.usercenterbackend.model.domain.request;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import java.io.IOException;
public class UserDeleteRequest extends JsonDeserializer<Long> {
@Override
public Long deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
String idStr = p.getText();
try {
return Long.parseLong(idStr);
} catch (NumberFormatException e) {
throw new IOException("Invalid ID format: " idStr, e);
}
}
}

3、在user类里delete的地方添加注解

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@JsonDeserialize(using = IdDeserializer.class)

4、在controller类传入user，在下文中使用getId获取id进行比较

成功

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@PostMapping("/delete")
public BaseResponse<Boolean> deleteUser(@RequestBody User user, HttpServletRequest request) {
if (!isAdmin(request)) {
throw new BusinessException(ErrorCode.NO_AUTH);
}

if (user.getId() <= 0) {
throw new BusinessException(ErrorCode.PARAMS_ERROR);
}
boolean b = userService.removeById(user.getId());
return ResultUtils.success(b);
}