SSM拦截器校验JSON数据(3) -- 解决拦截器获取json后，controller参数为空

本篇为系列文，不以目的为目的，以学习为目的。旨在学习，重在研究。

创建AccountWrapper继承HttpServletRequestWrapper

HttpServletRequestWrapper介绍

package ;



 




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import ;




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import ;




import ;



 




import ;



 



/**



 * @Description:  Account--Request--请求包装类，解决json只能接受一次的问题



 */




public class AccountWrapper extends HttpServletRequestWrapper{



 



	private byte[] requestBody;



	



	public AccountWrapper(HttpServletRequest request) throws IOException {



		super(request);



		requestBody = (());



	}



 



	@Override




	public BufferedReader getReader() throws IOException {



		return new BufferedReader(new InputStreamReader(getInputStream(),StandardCharsets.UTF_8));



	}



	



	@Override




	public ServletInputStream getInputStream() throws IOException {



		if(requestBody == null){



			requestBody = new byte[0];



		}



		final ByteArrayInputStream  bais = new ByteArrayInputStream(requestBody);



		return new ServletInputStream() {



			



			@Override




			public int read() throws IOException {



				return ();



			}



			



			@Override




			public void setReadListener(ReadListener readListener) {



				



			}



			



			@Override




			public boolean isReady() {



				return false;



			}



			



			@Override




			public boolean isFinished() {



				return false;



			}



		};



	}



}



 

修改preHandle的代码

@Override




public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)




			throws Exception {



	try{



		AccountInfo accountInfo = (request);



		//省略业务判断逻辑代码




	}catch (Exception e) {



		return false;



	}



}    



 



/**



*@Description: 解析request里的AccountInfo



*/




public AccountInfo getParam(HttpServletRequest request) throws IOException, SSOException {



	String jsonString = null;



	String submitMethod = ();



	if("GET".equals(submitMethod) || ("get")){



		jsonString = getParamStringByGet(request);



	}else if(("POST") || ("post")){



		jsonString = getParamJsonStringByPost(request);



	}else{



		("GetRequestJsonUtil解析Request参数错误--"+submitMethod);



	}



	("解析出来的参数--getParam：{}",jsonString);



	if((jsonString)){



		throw new SSOException(new ReturnMsg(EC.RTF_FALSE,EC.ERR_PARAM_NULL_CODE,EC.ERR_PARAM_NULL_MSG));



	}



	AccountInfo parse = (jsonString, );



	return parse;



}



 



/**



*@Description: 解析post方式提交的json数据



*/




private String getParamJsonStringByPost(HttpServletRequest request) throws IOException {



    //这里修改了




	AccountWrapper aWrapper = new AccountWrapper(request);



	int contentLength = ();



	if(contentLength<0){



		return null;



	}



	byte buffer[]  = new byte[contentLength];



	for (int i = 0; i < contentLength; i++) {



		int readlen = ().read(buffer,i,contentLength -i);



		if(readlen == -1){



			break;



		}



		i+=readlen;



	}



	return new String(buffer,"UTF-8");



}



 



/**



*@Description: 解析get方式提交的request参数



*/




private String getParamStringByGet(HttpServletRequest request) throws IOException {



    //这里修改了




	AccountWrapper aWrapper = new AccountWrapper(request);



	return new String(().getBytes("ios-8859-1"),"utf-8").replaceAll("%22", "\"");



}

这样并没有解决问题，因为request中的数据在复制给AccountWrapper 时读取过了（调用了方法），所以要用AccountWrapper 代替request传到controller中。

这样就需要用过滤器配合

配置过滤器AccountFilter

package ;



 




import ;



 




import ;




import ;




import ;




import ;




import ;




import ;




import ;



 




import org.;




import org.;



 




import ;



 



/**



 * @Description:  过滤器，用于controller可以获取json



 */



 




public class AccountFilter implements Filter{



 



	Logger logger = ();



	@Override




	public void init(FilterConfig filterConfig) throws ServletException {



	}



 



	@Override




	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)




			throws IOException, ServletException {



		AccountWrapper accountWrapper = null;



		("AccountFilter--doFilter");



		if(request instanceof HttpServletRequest){



			accountWrapper = new AccountWrapper((HttpServletRequest)request);



		}



		if(accountWrapper == null){



			(request, response);



		}else {



			(accountWrapper, response);//在这里将AccountWrapper代替request去了controller




		}



	}



 



	@Override




	public void destroy() {



		



	}



 



}

配置过滤器

<filter>




  	<filter-name>ssoAccountFilter</filter-name>




  	<filter-class></filter-class>




  </filter>




  <filter-mapping>




  	<filter-name>ssoAccountFilter</filter-name>




  	<url-pattern>/sso/account/*</url-pattern>




  </filter-mapping>

spring-mvc注册拦截器 （如果在第一篇文章时配置了就不需要了）

<!-- 注册拦截器 -->



<!--拦截器-->



<mvc:interceptors>



    <mvc:interceptor>




        <mvc:mapping path="/sso/account/**" /> <! --拦截路径 -- >



        <bean class=""></bean>




    </mvc:interceptor>




</mvc:interceptors>

 

大功告成