今天老板给我了一套代码,然后我就拿过去研究,代码的风格是SSM + Shiro + nginx + SpringBoot的MVC架构风格,springboot,是当下很火的一个框架,配合springcloud,dubbo可以完成分布式,当然,今天的重点不在这里,

今天看了一下代码的组织结构,大致跟以往的项目架构类似,不过有一些还是有些区别:

区别1

全局异常处理器。以往再写项目的时候,全局异常处理器都是自己定义在代码或者xml里(也就是声明在代码里),定义在 HandlerInterceptor的afterCompletion方法

HashMap<String, String> msg = new HashMap<String, String>();
        if (ex != null) {
            msg.put("result", "fail");
            if(ex instanceof CrudException){
                CrudException exception = (CrudException) ex;
                msg.put("messageCode", exception.getCode());
                msg.put("messageText", ex.getMessage());
            }
            ObjectMapper mapper = new ObjectMapper();
            String json = mapper.writeValueAsString(msg);
            response.setContentType("application/json;charset=UTF-8");
            response.setHeader("Pragma", "No-cache");
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Expires", 0);
            PrintWriter out = response.getWriter();
            out.print(json);
            out.flush();
            out.close();

这个是传统的全局异常定义的写法,在Spring4.2之后,有了新的写法,看下面:

比如: file

当然这个写法是SpringBoot的写法,spring的写法就是定义在xml里面,这里就不多说。下来是新项目用到的,也不算新写法,就是个人第一次见到这个,整理了一下, file 这样就,相当于对指定异常的捕捉了,@RestControllerAdvice 意思是把这个类当作bean的一个通知类,通知类可以实现SpringAOP的功能,也可以实现拦截器的功能,验证TOKEN,跨域问题比较常见,这个是区别1; 下来是 区别2:

  对请求的Json串解密,以及对响应的Json加密。这个就牵扯到了加解密问题了(暂不深讨,本例用的是AES加解密,本例未展示出AES工具类,如需要,请自行百度:AESUtil工具类)   过程就是:     以响应为先:实现ResponseBodyAdvice 接口并实现其方法,在beforeBodyWrite方法进行对响应的Json串加密修改等操作,这里你可以借鉴拦截器的后置方法,或者说

springAOP的返回通知,在这里我使用了自定义注解校验(如果说 Controller层有该注解则加密数据——对某些重要handler进行保护),下来晾代码:

	@RestController
	public class IndexController {
	@GetMapping(value = "/index/{id}",produces = MediaType.APPLICATION_JSON_UTF8_VALUE) @JsonController(encode = true)
	 //加解密标识 public Object index(@PathVariable(required = false,value = "id") Integer id, @RequestBody(required = false)String name){ 
	  List list = resourceService.selectAll(); 

	// mqSendMessage.sendMessage(MqEnums.TOPIC,MqEnums.LOGIN.getValue()+id,new BasUser()); 

	// AssertUtil.isNullOrEmpty(null,"sys_error"); 

	return "Hello World"+id +" "+ JsonUtils.toJson(list); }}

一切操作看代码:代码中自定义的注解JsonController就是作为加密的标识, 下来是配置关键环节了:ResponseBodyAdvice接口,当然,在配置这个接口之前要先声明ControllerAdvice注解。

	package org.choviwu.example.base;

	import com.fasterxml.jackson.core.JsonProcessingException;
	import com.fasterxml.jackson.databind.ObjectMapper;
	import org.choviwu.example.common.annatation.JsonController;
	import org.choviwu.example.common.util.AESUtil;
	import org.springframework.core.MethodParameter;
	import org.springframework.http.MediaType;
	import org.springframework.http.server.ServerHttpRequest;
	import org.springframework.http.server.ServerHttpResponse;
	import org.springframework.web.bind.annotation.RestControllerAdvice;
	import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

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

	/**
	 * 对请求的Json加解密
	 */
	@RestControllerAdvice(basePackages = "org.choviwu")
	public class ResultResponse implements ResponseBodyAdvice<Object> {

		private String key = "1fdsv3choviwu@#~";

		@Override
		public boolean supports(MethodParameter methodParameter, Class aClass) {
			return true;
		}

		/**
		 * 加密Json
		 * @param o  加密的Json
		 * @return
		 */
		@Override
		public Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType, Class aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {
			//是否加密Json
			if(methodParameter.getMethod().isAnnotationPresent(JsonController.class)){
				JsonController jsonController = methodParameter.getMethod().getAnnotation(JsonController.class);
				//如果加密
				if(jsonController.encode()){
					//TODO
					ObjectMapper objectMapper = new ObjectMapper();
					try {
					   String result =  objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(o);
						return AESUtil.getInstance().encrypt(result,key);//加密
					} catch (JsonProcessingException e) {
						e.printStackTrace();
					}
				}
			}

			return o;
		}
	}

这样就完成了加密响应参数的操作了;

下来是声明请求解密:

直接上代码:

package org.choviwu.example.base;

import org.apache.commons.io.IOUtils;
import org.choviwu.example.common.annatation.MyConvert;
import org.choviwu.example.common.annatation.convert.JsonConvert;
import org.choviwu.example.common.util.AESUtil;
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.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.RequestBodyAdvice;

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

@RestControllerAdvice
public class ApiRequest implements RequestBodyAdvice {


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

    @Override
    public Object handleEmptyBody(Object o, HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) {

        return o;
    }

    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) throws IOException {
        try {
            if(methodParameter.getMethod().isAnnotationPresent(MyConvert.class)){
                Object obj = aClass.newInstance();
                JsonConvert convert = new JsonConvert();
                convert.convert(obj);
                return new DHttpInputMessage(httpInputMessage);
            }
        }catch (Exception e){ }
        return httpInputMessage;
    }

    @Override
    public Object afterBodyRead(Object o, HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) {
        return o;
    }

    public static class DHttpInputMessage implements HttpInputMessage{
        private HttpHeaders headers;

        private InputStream body;
        private String key = "1fdsv3choviwu@#~";
        public DHttpInputMessage(HttpInputMessage inputMessage) throws IOException {
            this.headers = inputMessage.getHeaders();
            this.body = IOUtils.toInputStream(AESUtil.getInstance().decrypt(IOUtils.toString(inputMessage.getBody()),key));
        }

        @Override
        public InputStream getBody() throws IOException {
            return body;
        }

        @Override
        public HttpHeaders getHeaders() {
            return headers;
        }
    }
}

注:在你请求的Controller里面的方法(Mapping)时候,必须要声明@RequestBody,否则,拦截器不会进入你的RequestBodyAdvice

@RequestBody(required = false)String name 参数填写 name={"abc"} 如果看不懂,请自行学习SpringMVC SpringBoot基础

至此,学习完成! 记今天学习的成果。 ·2018/05/03