在开发过程中，有时候会需要使用错误码+错误信息的形式，来返回某些业务操作的错误结果信息，来代替效率较低的异常传递。
这样就需要封装一个统一的Result model作为返回值，代替直接返回数据等结果。
1.定义错误码 - 错误信息接口
错误码可能是String、Integer、Long 等类型，也可能是enum类型。因此这里使用泛型来代替，错误码类型，可以提高灵活性
。也可以通过枚举直接实现CodeMessage接口。
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public interface CodeMessage<C>{ C getCode(); String getMessage();} |
2.实现Result Model
这里定义的是service层的Result。有时候在controller层只会作一些简单的参数校验，在service层会作进一步的校验，
如果controller中需要统一返回一个JsonResult可以将ServiceResult作一个简单的转换器进行转换。
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public class ServiceResult<T, C> implements Serializable { public static final CodeMessage<String> SUCCESS = new DefaultMessage<>("00000000", "success"); private T data; private CodeMessage<C> message; private boolean isSuccess; ServiceResult(T data, boolean isSuccess, CodeMessage<C> message) { this.data = data; this.message = message; this.isSuccess = isSuccess; } public T getData() { return data; } public CodeMessage<C> getCodeMessage() { return message; } public boolean isSuccess() { return isSuccess; } public static <D, C> ServiceResultBuilder<D, C> success() { ServiceResultBuilder<D, C> builder = builder(); return builder.isSuccess(true); } public static <D, C> ServiceResultBuilder<D, C> success(CodeMessage<C> codeMessage) { ServiceResultBuilder<D, C> builder = builder(); return builder.isSuccess(true).code(codeMessage.getCode()).message(codeMessage.getMessage()); } public static <D> ServiceResult<D, String> success(D data) { ServiceResultBuilder<D, String> success = success(SUCCESS); return success.data(data).build(); } public static <D, C> ServiceResult<D, C> error(CodeMessage<C> codeMessage) { ServiceResultBuilder<D, C> builder = builder(); return builder.isSuccess(false).code(codeMessage.getCode()).message(codeMessage.getMessage()).build(); } public static <D, C> ServiceResultBuilder<D, C> error() { ServiceResultBuilder<D, C> builder = builder(); return builder.isSuccess(false); } static <D, C> ServiceResultBuilder<D, C> builder() { return new ServiceResultBuilder<>(); } public static class DefaultMessage<C> implements CodeMessage<C>, java.io.Serializable { private C code; private String message; public DefaultMessage(C code, String message) { this.code = code; this.message = message; } @Override public C getCode() { return code; } @Override public String getMessage() { return message; } @Override public String toString() { return "DefaultMessage{" + "code=" + code + ", message='" + message + '\'' + '}'; } } public static class ServiceResultBuilder<T, C> { private T data; private C code; private String message; private boolean isSuccess; ServiceResultBuilder() { //package private } public ServiceResultBuilder<T, C> data(T data) { this.data = data; return this; } ServiceResultBuilder<T, C> isSuccess(boolean isSuccess) { this.isSuccess = isSuccess; return this; } public ServiceResultBuilder<T, C> code(C code) { this.code = code; return this; } public ServiceResultBuilder<T, C> message(String message) { this.message = message; return this; } public ServiceResult<T, C> build() { Objects.requireNonNull(code, "code"); Objects.requireNonNull(code, "message"); return new ServiceResult<>(data, isSuccess, new DefaultMessage<>(code, message)); } } @Override public String toString() { return "ServiceResult{" + "data=" + data + ", message=" + message + ", isSuccess=" + isSuccess + '}'; }} |
3.使用
定义枚举错误码
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pubilc enum CodeMessageEnum implements CodeMessage<Integer> { some_error(1001, "错误信息。"); Integer code; String message; CodeMessageEnum(Integer code, String message) { this.code = code; this.message = message; } @Override public Integer getCode() { return code; } @Override public String getMessage() { return message; }} |
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//返回正确结果带返回值。ServiceResult<List<String>, String> s = ServiceResult.success(Arrays.asList("1", "2", "3"));s.isSuccess(); //trueServiceResult<?, Integer> e1 = ServiceResult.error(CodeMessageEnum.some_error);e1.isSuccess(); //falseServiceResult<?, Long> e2 = ServiceResult.error(new ServiceResult.DefaultMessage<>(1000L, "error"));e2.isSuccess(); //false//ServiceResult{data=[1, 2, 3], message=DefaultMessage{code=00000000, message='success'}, isSuccess=true}System.out.println(s);//ServiceResult{data=null, message=DefaultMessage{code=1001, message='错误信息。'}, isSuccess=false}System.out.println(e1);//ServiceResult{data=null, message=DefaultMessage{code=1000, message='error'}, isSuccess=false}System.out.println(e2); |
补充知识：java 封装返回结果实体类 返回结果以及错误信息
我就废话不多说了，大家还是直接看代码吧~
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public class ResponseMessage { private final static String STATUS_OK = "0"; private final static String STATUS_ERROR = "1"; private String status; // 状态 private Object data; // 返回值 private Exception e; // 异常类捕获 private String msg; // 自定义信息 public String getStatus() { return status; } public void setStatus(String status) { this.status = status; } public Object getData() { return data; } public void setData(Object data) { this.data = data; } public Exception getE() { return e; } public void setE(Exception e) { this.e = e; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public ResponseMessage() { super(); } public ResponseMessage(String status, Object data, Exception e, String msg) { super(); this.status = status; this.data = data; this.e = e; this.msg = msg; } /** * 成功的结果 * @param data 返回结果 * @param msg 返回信息 */ public static ResponseMessage newOkInstance(Object data, String msg) { return new ResponseMessage(ResponseMessage.STATUS_OK, data, null, msg); } /** * 成功的结果 * @param data 返回结果 */ public ResponseMessage newOkInstance(Object data) { return new ResponseMessage(ResponseMessage.STATUS_OK, data, null, null); } /** * 失败的结果 * @param msg 返回信息 */ public static ResponseMessage newErrorInstance(String msg) { return new ResponseMessage(ResponseMessage.STATUS_ERROR, null, null, msg); } /** * 失败的结果 * @param e 异常对象 * @param msg 返回信息 */ public static ResponseMessage newErrorInstance(Exception e, String msg) { return new ResponseMessage(ResponseMessage.STATUS_ERROR, null, e, msg); }} |
以上这篇Java封装统一的Result Model案例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/m0_38043362/article/details/79696296
