Spring统一处理请求响应与异常
在web开发中，规范所有请求响应类型，不管是对前端数据处理，还是后端统一数据解析都是非常重要的。今天我们简单的方式实现如何实现这一效果
实现方式
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定义响应类型
public class ResponseResult<T> {private static final String SUCCESS_CODE = "000";private static final String FAILURE_CODE = "999";private String code;private String message;private T data;public static <T> ResponseResult<T> ok(T data){ResponseResult responseResult = new ResponseResult();responseResult.setCode(SUCCESS_CODE);responseResult.setData(data);return responseResult;}public static ResponseResult fail(String code, String message){if( code == null ){code = FAILURE_CODE;}ResponseResult responseResult = new ResponseResult();responseResult.setCode(code);responseResult.setMessage(message);return responseResult;}public static ResponseResult fail(String message){return fail(FAILURE_CODE, message);}
}
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定义统一的异常处理流程，通过
@RestControllerAdvice与@ExceptionHandler注解可以对Controller中的异常统一处理
@RestControllerAdvice
public class ControllerAdviceHandle {@ExceptionHandler(Exception.class)public ResponseResult handleException(Exception exception) {BusException busException;if (exception instanceof BusException asException) {busException = asException;} else {busException = convertException(exception);}return ResponseResult.fail(busException.getCode(), busException.getMessage());}
}-
定义统一响应拦截，通过是实现接口
ResponseBodyAdvice，这里可以和上面的异常一起处理
public class ControllerAdviceHandle implements ResponseBodyAdvice {@Overridepublic boolean supports(MethodParameter returnType, Class converterType) {return true;}@Overridepublic Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType,ServerHttpRequest request, ServerHttpResponse response) {if( body instanceof ResponseResult){return body;}return ResponseResult.ok(body);}
}
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定义spring配置，实现自动装配
在resource目录添加自动注入配置META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports，这样通过引入jar就可以自动使用该配置
cn.cycad.web.response.ResponseConfig
应用示例
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比如现在有一个
User实体，我们通过继承基类
@RestController
@RequestMapping("/test")
public class TestController {@GetMapping("/{val}")public Object get(@PathVariable("val") String val) throws BusException {if( "1".equals(val) ){throw new BusException("参数错误");}return Map.of("val",val);}}
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通过调用请求，可以看到不管是否异常，结果都是下面的格式
{"code": "999","message": null,"data": null
}