SpringBoot集成自定义HandlerMethodArgumentResolver

传统SpringMVC集成自定义HandlerMethodArgumentResolver的方式为：http://www.cnblogs.com/yangzhilong/p/6282218.html

在SpringBoot中是去配置文件化的，具体做法有：

1、启动类继承WebMvcConfigurerAdapter

2、另外写一个@Configuration注解的来继承WebMvcConfigurerAdapter（推荐）

import java.util.List;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.longge.LoginUserInfoMethodArgumentResolver;

@SpringBootApplication
public class MyBootApplication extends WebMvcConfigurerAdapter{
    public static void main(String[] args) {
        SpringApplication.run(MyBootApplication.class, args);
    }

    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
        super.addArgumentResolvers(argumentResolvers);
        argumentResolvers.add(new LoginUserInfoMethodArgumentResolver());
    }
}

import org.apache.commons.lang3.StringUtils;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import com.longge.utils.Constant;
import com.longge.utils.RedisCacheUtils;

/**
 * 获取用户的session dto
 */
public class LoginUserInfoMethodArgumentResolver implements HandlerMethodArgumentResolver {

    @Override
    public Object resolveArgument(MethodParameter arg0, ModelAndViewContainer arg1, NativeWebRequest arg2,
            WebDataBinderFactory arg3) throws Exception {
        String token = arg2.getHeader(Constant.TOKEN_KEY);
        if(StringUtils.isNotBlank(token)) {
            return RedisCacheUtils.getUserInfo(token);
        }
        return null;
    }

    @Override
    public boolean supportsParameter(MethodParameter arg0) {
        return arg0.getParameterType().equals(UserInfo.class);
    }

}

使用方法：

@ApiOperation("新增")
@PutMapping("add")
public ResponseResult<SupplierDto> add(UserInfo userInfo, @Valid @RequestBody SupplierDto supplierDto) {
    // 这里的UserInfo不需要加任何注解，因为LoginUserInfoMethodArgumentResolver是对class的类型来解析的
}