springboot中自定义异常及接口异常处理 springboot

SpringBoot默认的错误处理直接回返回对应的错误视图页面。比如404、500错误，但是在实际的项目中是不允许出现500错误的，而且返回错误也是需要给出提示的。
一般情况下，可以通过if 判断条件来过滤，避免异常的发生

//判断是否重复添加 if (memberList.contains(String.valueOf(operatorUid))) { joinConversationAns.setResultCode(102); joinConversationAns.setResultString("You're already in the conversation"); return joinConversationAns; }

但是在一个复杂的接口中，判断的数据非常多，写很多的if else，后期会变得非常不好维护，而且也很不美观。
那么在spingboot中，可以可以做自定义异常处理
【springboot中自定义异常及接口异常处理】首先是定义异常类

public class MsgArgumentException extends RuntimeException { private static final long serialVersionUID = 1L; protected final String message; public MsgArgumentException(String message) { this.message = message; }public MsgArgumentException(String message, Throwable e) { super(message, e); this.message = message; }@Override public String getMessage() { return message; }}

然后处理异常，给出返回值和返回码

@ControllerAdvice public class MsgArgumentExceptionHandler {@ExceptionHandler(value = https://www.it610.com/article/MsgArgumentException.class) @ResponseBody public ClientSendMsgToServerAns errorHandler(MsgArgumentException e) { e.printStackTrace(); ClientSendMsgToServerAns clientSendMsgToServerAns = new ClientSendMsgToServerAns(); clientSendMsgToServerAns.setResultCode(101); clientSendMsgToServerAns.setResultString("消息参数错误"); returnclientSendMsgToServerAns; } }

然后在业务中，只要有校验不通过的代码，我们可以放心大胆的throw 异常了，不要怕前端返回500，例如下面针对前端的参数做校验。

switch (msgType) { case MsgTypeCode.TEXT_MESSAGE: msgBuild.setTextMsg(msgInfo.getTextMsg()); return msgBuild.build(); case MsgTypeCode.IMAGE_MESSAGE: ImageMsgInfo imageMsgInfo = msgInfo.getImage_msg(); if ( StringUtils.isEmpty(imageMsgInfo.getUrl()) || StringUtils.isEmpty(imageMsgInfo.getName()) || imageMsgInfo.getWeight() == 0 || imageMsgInfo.getHeight() == 0 || StringUtils.isEmpty(imageMsgInfo.getFormat()) || imageMsgInfo.getSize() == 0 ) { throw new MsgArgumentException("参数校验错误"); }AoeImMessage.ImageMsgInfo.Builder imageBuild = AoeImMessage.ImageMsgInfo.newBuilder(); imageBuild.setUrl(imageMsgInfo.getUrl()); imageBuild.setName(imageMsgInfo.getName()); imageBuild.setWeight(imageMsgInfo.getWeight()); imageBuild.setHeight(imageMsgInfo.getHeight()); imageBuild.setFormat(imageMsgInfo.getFormat()); imageBuild.setSize(imageMsgInfo.getSize()); imageBuild.setExtra(imageMsgInfo.getExtra()); msgBuild.setImageMsg(imageBuild); return msgBuild.build(); case MsgTypeCode.AUDIO_MESSAGE: AudioMsgInfo audioMsgInfo = msgInfo.getAudio_msg(); if ( StringUtils.isEmpty(audioMsgInfo.getUrl()) || StringUtils.isEmpty(audioMsgInfo.getName()) || StringUtils.isEmpty(audioMsgInfo.getFormat()) || audioMsgInfo.getDuration() == 0 || audioMsgInfo.getSize() == 0 ) { throw new MsgArgumentException("参数校验错误"); }AoeImMessage.AudioMsgInfo.Builder audioBuild = AoeImMessage.AudioMsgInfo.newBuilder(); audioBuild.setUrl(audioMsgInfo.getUrl()); audioBuild.setName(audioMsgInfo.getName()); audioBuild.setDuration(audioMsgInfo.getDuration()); audioBuild.setFormat(audioMsgInfo.getFormat()); audioBuild.setSize(audioMsgInfo.getSize()); audioBuild.setExtra(audioMsgInfo.getExtra()); msgBuild.setAudioMsg(audioBuild); return msgBuild.build(); case MsgTypeCode.VIDEO_MESSAGE: VideoMsgInfo videoMsgInfo = msgInfo.getVideo_msg(); if ( StringUtils.isEmpty(videoMsgInfo.getUrl()) || StringUtils.isEmpty(videoMsgInfo.getName()) || StringUtils.isEmpty(videoMsgInfo.getImageUrl()) || StringUtils.isEmpty(videoMsgInfo.getFormat()) || videoMsgInfo.getDuration() == 0 || videoMsgInfo.getSize() == 0 || videoMsgInfo.getWeight() == 0 || videoMsgInfo.getHeight() == 0 ) { throw new MsgArgumentException("参数校验错误"); }AoeImMessage.VideoMsgInfo.Builder videoBuild = AoeImMessage.VideoMsgInfo.newBuilder(); videoBuild.setUrl(videoMsgInfo.getUrl()); videoBuild.setName(videoMsgInfo.getName()); videoBuild.setImageUrl(videoMsgInfo.getImageUrl()); videoBuild.setDuration(videoMsgInfo.getDuration()); videoBuild.setFormat(videoMsgInfo.getFormat()); videoBuild.setSize(videoMsgInfo.getSize()); videoBuild.setHeight(videoMsgInfo.getHeight()); videoBuild.setWeight(videoMsgInfo.getWeight()); videoBuild.setExtra(videoMsgInfo.getExtra()); msgBuild.setVideoMsg(videoBuild); return msgBuild.build();

当前端的参数不通过时，后台会自动处理异常，很省心。