演示代码：
1. logs.controller.ts
import { Body, Controller, Post, UseInterceptors } from '@nestjs/common';
import { IsNotEmpty, IsString } from 'class-validator';
import { SerializeInterceptor } from '../interceptors/serialize/serialize.interceptor';
import { Expose } from 'class-transformer';class LogsDto {@IsString()@IsNotEmpty()msg: string;@IsString()id: string;@IsString()name: string;
}
class PublicLogsDto {@Expose()msg: string;
}
@Controller('logs')
export class LogsController {@Post()@UseInterceptors(new SerializeInterceptor(PublicLogsDto))postTest(@Body() dto: LogsDto) {console.log('🚀 ~ LogsController ~ postTest ~ dto:', dto);return dto;}
}
2. serialize.interceptor.ts代码
import {CallHandler,ExecutionContext,Injectable,NestInterceptor,
} from '@nestjs/common';
import { plainToInstance } from 'class-transformer';
import { map, Observable } from 'rxjs';@Injectable()
export class SerializeInterceptor implements NestInterceptor {constructor(private dto: any) {}intercept(context: ExecutionContext, next: CallHandler): Observable<any> {// const req = context.switchToHttp().getRequest();console.log('这里在拦截器执行之前');return next.handle().pipe(map((data) => {console.log('datadata', data);return plainToInstance(this.dto, data, {// 设置为true之后，所有经过该interceptor的接口都需要设置Expose或Exclude// Expose就是设置哪些字段需要暴露，Exclude就是设置哪些字段不需要暴露excludeExtraneousValues: true,});}),);}
}
)
)
