springboot 統一處理請求非法參數

通過攔截器和過濾器實現，話不多說上代碼。

1、重寫HttpServletRequestWrapper讀取body裏面的內容。

public class RequestWrapper extends HttpServletRequestWrapper {
    private final String body;

    public RequestWrapper(HttpServletRequest request) {
        super(request);
        StringBuilder stringBuilder = new StringBuilder();
        BufferedReader bufferedReader = null;
        InputStream inputStream = null;
        try {
            inputStream = request.getInputStream();
            if (inputStream != null) {
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                char[] charBuffer = new char[128];
                int bytesRead = -1;
                while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                    stringBuilder.append(charBuffer, 0, bytesRead);
                }
            } else {
                stringBuilder.append("");
            }
        } catch (IOException ex) {

        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        body = stringBuilder.toString();
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());
        ServletInputStream servletInputStream = new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }
            @Override
            public boolean isReady() {
                return false;
            }
            @Override
            public void setReadListener(ReadListener readListener) {
            }
            @Override
            public int read() throws IOException {
                return byteArrayInputStream.read();
            }
        };
        return servletInputStream;

    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }

    public String getBody() {
        return this.body;
    }

}

2、因爲reque裏面的內容只能讀取一次，需要重寫回去。增加ChannelFilter

import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@Component
@WebFilter(urlPatterns = "/*",filterName = "channelFilter")
public class ChannelFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        ServletRequest requestWrapper = null;
        if(servletRequest instanceof HttpServletRequest) {
            requestWrapper = new RequestWrapper((HttpServletRequest) servletRequest);
        }
        if(requestWrapper == null) {
            filterChain.doFilter(servletRequest, servletResponse);
        } else {
            filterChain.doFilter(requestWrapper, servletResponse);
        }
    }

    @Override
    public void destroy() {

    }
}

3、增加攔截器，獲取請求的body

@Component
public class ParamInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
         String method = request.getMethod();
         String contentType = request.getContentType() == null ? "" : request.getContentType();
        if (HttpMethod.POST.name().equals(method) && !contentType.equals(MediaType.MULTIPART_FORM_DATA_VALUE)) {
            RequestWrapper requestWrapper = new RequestWrapper(request);
            String body = requestWrapper.getBody();
            testParam(body);
        }
        return true;
    }


    private void testParam(String param){
        try {
            param = param.replace(" ", "");
            param = param.replace("&", "");
            param = param.replace("#", "");
            param = param.replace(" ", "");
            param = param.replace("\"\"", "");
            if (param.toLowerCase().contains("<script")
                    || param.contains("<")
                    || param.contains(">")
                    || param.toLowerCase().contains("<html")
                    || param.toLowerCase().contains("<header")
                    || param.toLowerCase().contains("alert")
                    || param.toLowerCase().contains("console")
            ) {
                throw new BusinessException("500", "非法參數！");
            }
        } catch (Exception ex) {
            if (ex instanceof BusinessException) {
                throw new BusinessException("500", ((BusinessException) ex).getMsg());
            }
        }
    }
}

4、攔截器配置（略）

5、過濾器配置，在啓動類上增加@ServletComponentScan註解