Spring Boot 统一数据返回格式的解决方案

import com.example.demo.model.Result;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;
@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {
    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType,
                                  MediaType selectedContentType, Class selectedConverterType,
                                  ServerHttpRequest request, ServerHttpResponse response) {
        return Result.success(body); //返回 Result 类型的数据
    }
}

import com.example.demo.model.BookInfo;
import com.example.demo.model.Result;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/test")
public class TestController {
    @RequestMapping("/t1")
    public Integer t1() {
        return 12334;
    }
    @RequestMapping("/t2")
    public String t2() {
        return "hello";
    }
    @RequestMapping("/t3")
    public Boolean t3() {
        return true;
    }
    @RequestMapping("/t4")
    public BookInfo t4() {
        return new BookInfo();
    }
    @RequestMapping("/t5")
    public Result t5() {
        return Result.success("success");
    }
}

@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {
    @Autowired
    private ObjectMapper objectMapper;
    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }
    @SneakyThrows
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType,
                                  MediaType selectedContentType, Class selectedConverterType,
                                  ServerHttpRequest request, ServerHttpResponse response) {
        //body 是返回的结果
        //当返回结果为Result类型时,就直接返回body
        if (body instanceof Result) {
            return body;
        }
        //返回结果为String类型, 使⽤SpringBoot内置提供的Jackson来实现信息的序列化
        if (body instanceof String) {
            return objectMapper.writeValueAsString(Result.success(body));
        }
        return Result.success(body); //返回 Result 类型的数据
    }
}