SpringBoot中使用过滤器Filter

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场景：API的参数都是经过加密的，于是在过滤器中，将获取到的请求的参数先解密再去进行处理

一、实现Filter接口

public class TestFilter implements Filter { private Logger logger = LoggerFactory.getLogger(this.getClass()); @Override
public void init(FilterConfig filterConfig) throws ServletException {
logger.info("TestFilter init");
} @Override
public void destroy() {
logger.info("TestFilter destroy");
} @Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
HttpServletResponse httpServletResponse = (HttpServletResponse) response;
String servletPath = httpServletRequest.getServletPath(); String body = HttpHelper.getBodyString(httpServletRequest);
JSONObject param = JSONObject.parseObject(body);
if (param == null) {
logger.info("参数为空");
return;
}
String data = param.getString("data");
String time = param.getString("time");
ServletRequestWrapper requestWrapper = new ServletRequestWrapper(httpServletRequest,
param.toString().getBytes(Charset.forName("UTF-8"))); // 参数解密解密过程省略
//.............
param.put("data", decryptParam); //将解密后的data取代加密的data
requestWrapper.setBody(param.toString().getBytes(Charset.forName("UTF-8"))); try {
// 捕获异常
chain.doFilter(requestWrapper, response);
} catch (Exception e) {
logger.error("", e);
}
}}