SpringBoot 同一个接口同时支持 form 表单、form-data、json 的优雅写法
}
}
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但是这样写有弊端
-
代码很丑，具体到解析代码又臭又长
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只能返回固定 map 或者自己重新组装参数类
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无法使用
@Valid校验参数，像我这种几十个参数都要检验的简直是灾难
优雅版本
网上有 form 表单和 json 同时兼容的版本，但是没有兼容 form-data，我在这做一下补充。
1. 自定义注解
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface GamePHP {
}
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2. 自定义注解解析
public class GamePHPMethodProcessor implements HandlerMethodArgumentResolver {
private GameFormMethodArgumentResolver formResolver;
private GameJsonMethodArgumentResolver jsonResolver;
public GamePHPMethodProcessor() {
List
PHPMessageConverter PHPMessageConverter = new PHPMessageConverter();
messageConverters.add(PHPMessageConverter);
jsonResolver = new GameJsonMethodArgumentResolver(messageConverters);
formResolver = new GameFormMethodArgumentResolver();
}
@Override
public boolean supportsParameter(MethodParameter parameter) {
GamePHP ann = parameter.getParameterAnnotation(GamePHP.class);
return (ann != null);
}
@Override
public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) throws Exception {
ServletRequest servletRequest = nativeWebRequest.getNativeRequest(ServletRequest.class);
String contentType = servletRequest.getContentType();
if (contentType == null) {
throw new IllegalArgumentException(“不支持contentType”);
}
if (contentType.contains(“application/json”)) {
return jsonResolver.resolveArgument(methodParameter, modelAndViewContainer, nativeWebRequest, webDataBinderFactory);
}
if (contentType.contains(“application/x-www-form-urlencoded”)) {
return formResolver.resolveArgument(methodParameter, modelAndViewContainer, nativeWebRequest, webDataBinderFactory);
}
if (contentType.contains(“multipart”)) {
return formResolver.resolveArgument(methodParameter, modelAndViewContainer, nativeWebRequest, webDataBinderFactory);
}
throw new IllegalArgumentException(“不支持contentType”);
}
}
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3. 添加到 spring configuration
@Bean
public MyMvcConfigurer mvcConfigurer() {
return new MyMvcConfigurer();
}
public static class MyMvcConfigurer implements WebMvcConfigurer {
public void addArgumentResolvers(List resolvers) {
resolvers.add(new GamePHPMethodProcessor());
}
}
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4. form-data 的特殊处理
引入 jar 包
commons-fileupload
commons-fileupload
1.3.1
commons-io
commons-io
2.4
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新增解析 bean
@Bean(name = “multipartResolver”)
public MultipartResolver multipartResolver(){
CommonsMultipartResolver resolver = new CommonsMultipartResolver();
resolver.setDefaultEncoding(“UTF-8”);
resolver.setResolveLazily(true);//resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常
resolver.setMaxInMemorySize(40960);
resolver.setMaxUploadSize(5010241024);//上传文件大小 50M 5010241024
return resolver;
}
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