spring boot 给返回值加状态 BaseData

JavaWeb开发中，需要给前端返回的数据加上一些头部的状态信息，来表示请求成功或失败的状态原因

一、数据添加状态信息

　　1.新建BaseData

public class BaseData<T> {

    private String returnCode;
    private String returnMsg;
    private T data;
    //其他的get set toString 方法略
}

　　2.定义工具类：

public final class ReturnInfoUtils {
    private ReturnInfoUtils(){}
    //返回状态信息
    public static final String SUCCESSCODE="100";
    public static final String SUCCESSMSG="操作成功";
    public static final String FAILCODE="500";
    public static final String FAILMSG="操作失败";
}

　　3.定义注解：

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface ReturnWrapper {

    String returnCode() default ReturnInfoUtils.SUCCESSCODE;
    String returnMsg() default  ReturnInfoUtils.SUCCESSMSG;
}

　　4.新建类继承AbstractMappingJacksonResponseBodyAdvice并重写一个切面方法beforeBodyWriteInternal

　　

package com.zpark.tools.interceptor;

import com.zpark.response.ReturnDto;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.json.MappingJacksonValue;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.AbstractMappingJacksonResponseBodyAdvice;

/**
 * @author cosmo
 * @Title: CommonWrsControllerAdvice
 * @ProjectName
 * @Description: TODO
 * @date  
 */
@RestControllerAdvice
public class CommonWrsControllerAdvice extends AbstractMappingJacksonResponseBodyAdvice {
    @Override
    protected void beforeBodyWriteInternal(MappingJacksonValue mappingJacksonValue, MediaType mediaType, MethodParameter methodParameter, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {
        if (methodParameter.getMethod().isAnnotationPresent(RerutnWrapper.class)) {
            mappingJacksonValue.setValue(getWrapperResponse(methodParameter,serverHttpRequest, mappingJacksonValue.getValue()));
        }
    }

    private ReturnDto getWrapperResponse(MethodParameter returnType, ServerHttpRequest req, Object data) {
        ReturnWrapper wrapper=returnType.getMethod().getAnnotation(ReturnWrapper.class);
        BaseData = new BaseData();
        returnDto.setData(data);
        returnDto.setreturnCode(wrapper.ReturnCode());
        return returnDto;
    }
}

就可以用注解来返回的数据

  /**
     * 测试.
     *
     * @return the attachment info
     */
    @ResponseBody
    @RequestMapping(value = {"test"})
    @RestWrapper(msg = ReturnInfoUtils.GETSUCCESS)
    public List<Employee> test() {
        List<Employee> employeeList=new ArrayList<>();
        Employee employee=new Employee();
        employee.setName("lisi");
        employeeList.add(employee);
        return employeeList;
    }
 

返回数据：

{
    "returnCode": "SUCCESS",
    "returnMsg": "操作成功",
    "data": [
        {
            "name": "lisi"
        }
    ]
}