前言
由于公司业务需求需要对传来的密码解密,每个都解密一次太过于麻烦，借助spring RequestBodyAdvice 特性来做统一解密处理

1、自定义注解

package cn.oq.dz.finance.common.annotation;

/**
 * @Description: j
 * @Author: hongwang.zhang
 * @CreateDate: 2019/10/12 15:07
 * @Version: 1.0
 */

import java.lang.annotation.*;

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD ,ElementType.METHOD })
public @interface Decrypt {

    /**
     * 解密方式
     * @return
     */
    String value() default "";
}

package cn.oq.dz.finance.web.advice;

import cn.oq.dz.finance.business.ElectronicAccountBusiness;
import cn.oq.dz.finance.common.annotation.Decrypt;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.RequestBodyAdvice;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Type;

/**
 * @Description: spring mvc 全局入参解密
 *   需要在 controller  添加 @Decrypt 注解  和需要解密的字段加上 @Decrypt 注解
 * @Author: hongwang.zhang
 * @CreateDate: 2019/10/12 14:54
 * @Version: 1.0
 */
@Slf4j
@ControllerAdvice
public class RequestControllerAdvice  implements RequestBodyAdvice {

    @Autowired
    private ElectronicAccountBusiness electronicAccountBusiness;

    @Override
    public boolean supports(MethodParameter methodParameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        return true;
    }

    @Override
    public Object handleEmptyBody(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        return null;
    }

    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) throws IOException {
        if(parameter.getMethodAnnotation(Decrypt.class) == null){
            return inputMessage;
        }
        return new HttpInputMessage() {
            @Override
            public InputStream getBody() throws IOException {
                String bodyStr = IOUtils.toString(inputMessage.getBody(),"utf-8");
                JSONObject jsonObject = JSONObject.parseObject(bodyStr);
                Class clazz = null;
                try {
                    clazz = Class.forName(targetType.getTypeName());
                } catch (ClassNotFoundException e) {
                    log.info("RequestControllerAdvice:",e);
                }
                if(clazz == null ){
                  return (InputStream) inputMessage;
              }
                for (Field field : clazz.getDeclaredFields()) {
                    Decrypt decrypt = field.getAnnotation(Decrypt.class);
                    if(decrypt != null){
                        jsonObject.put(field.getName(),electronicAccountBusiness.decryptionPassword(jsonObject.getString(field.getName())));
                    }
                }
                return  IOUtils.toInputStream(jsonObject.toJSONString(),"utf-8");
            }
            @Override
            public HttpHeaders getHeaders() {
                return inputMessage.getHeaders();
            }
        };
    }
    @Override
    public Object afterBodyRead(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        return body;
    }
}