SpringBoot项目拦截器获取Post方法的请求body实现

1). 存在问题
流只能读取一次

2). 目标
多次读取流

3). 解决方法
创建包装类

4). RequestWrapper

package com.mazaiting.redeye.wrapper;
 
import com.mazaiting.redeye.utils.StreamUtil;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
 
/***
 * @author mazaiting
 * @date 2019-06-27
 * @decription HttpServletRequest 包装器
 * 解决: request.getInputStream()只能读取一次的问题
 * 目标: 流可重复读
 */
@Slf4j
public class RequestWrapper extends HttpServletRequestWrapper {
    /**
     * 日志
     */
    private static final Logger mLogger = LoggerFactory.getLogger(RequestWrapper.class);
 
    /**
     * 请求体
     */
    private String mBody;
 
    public RequestWrapper(HttpServletRequest request) {
        super(request);
        // 将body数据存储起来
        mBody = getBody(request);
    }
 
    /**
     * 获取请求体
     * @param request 请求
     * @return 请求体
     */
    private String getBody(HttpServletRequest request) {
        try {
            return StreamUtil.getString(request.getInputStream());
        } catch (IOException e) {
            mLogger.debug(e.getMessage());
            throw new RuntimeException(e);
        }
    }
 
    /**
     * 获取请求体
     * @return 请求体
     */
    public String getBody() {
        return mBody;
    }
 
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }
 
    @Override
    public ServletInputStream getInputStream() throws IOException {
        // 创建字节数组输入流
        final ByteArrayInputStream bais = new ByteArrayInputStream(mBody.getBytes(Charset.defaultCharset()));
 
        return 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 bais.read();
            }
        };
    }
}

5).设置过滤器(必须)

@Component
@WebFilter(filterName = "HttpServletRequestFilter", urlPatterns = "/")
@Order(10000)
public class HttpServletRequestFilter 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);
        }
        //获取请求中的流如何，将取出来的字符串，再次转换成流，然后把它放入到新request对象中
        // 在chain.doFiler方法中传递新的request对象
        if(null == requestWrapper) {
            filterChain.doFilter(servletRequest, servletResponse);
        } else {
            filterChain.doFilter(requestWrapper, servletResponse);
        }
    }
 
    @Override
    public void destroy() {
 
    }
}

6). 使用

/***
 *
 * @author mazaiting
 * @date 2019-06-26
 * @decription Session 拦截器
 */
public class SessionInterceptor implements HandlerInterceptor {
 
    /**
     * 日志
     */
    private static final Logger mLogger = LoggerFactory.getLogger(SessionInterceptor.class);
 
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        mLogger.debug("SessionInterceptor");
        // 获取地址
        String url = request.getRequestURL().toString();
        mLogger.debug("url: " + url);
        // 获取 session
        HttpSession session = request.getSession();
        String id = session.getId();
        mLogger.debug("sessionId: " + id);
        String requestMethod = request.getMethod();
        mLogger.debug("requestMethod: " + requestMethod);
        String servletPath = request.getServletPath();
        mLogger.debug("servletPath: " + servletPath);
 
        if (isJson(request)) {
            String body = new RequestWrapper(request).getBody();
            mLogger.debug("body: " + body);
        }
 
        return true;
    }
 
    /**
     * 判断本次请求的数据类型是否为json
     *
     * @param request request
     * @return true: 是 JSON 数据; false: 非 json 数据
     */
    private boolean isJson(HttpServletRequest request) {
        if (request.getContentType() != null) {
            return request.getContentType().equals(MediaType.APPLICATION_JSON_VALUE) ||
                    request.getContentType().equals(MediaType.APPLICATION_JSON_UTF8_VALUE);
        }
 
        return false;
    }
}

到此这篇关于SpringBoot项目拦截器获取Post方法的请求body实现的文章就介绍到这了,更多相关SpringBoot获取Post方法的请求body内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们！