解决springboot只能获取一次post请求的body数据

自定义一个类继承 HttpServletRequestWrapper

HttpServletRequestWrapper 类可以用来做关键字过滤器，因为post提交的请求是以流的形式存放，所以获取也需要以流方式获取，但是如果在拦截器中直接获取，那么在controller中将无法在获取第二次，因为流的指针无法回到最初的位置。所以使用此类就可以解决此类问题。原理是将内容以流的形式获取后，在将内容以流的形式存放进request请求中。

import com.jgmes.base.utils.JgmesFilterSpecialCharUtil;
import org.apache.commons.lang.StringUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
import java.nio.charset.Charset;
import java.util.List;/*** @author Zh* @version v1.0* @description:* @date 2020/8/6 19:07*/
public class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper {private final byte[] body;public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) throws IOException {super(request);String sessStr = getBody(request);this.body = sessStr.getBytes(Charset.forName("UTF-8"));}/*** 获取body* @param request* @return* @throws IOException*/public String getBody(HttpServletRequest request) throws IOException {StringBuffer stringBuffer = new StringBuffer();InputStream inputStream = request.getInputStream();BufferedReader reader = null;String line = "";while ((line = reader.readLine()) != null){stringBuffer.append(line);}try{reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8")));}catch (Exception e){throw e;}finally {reader.close();}String param = stringBuffer.toString();filterIllegal(param);return param;}/*** 过滤特殊字符 自定义方法* @param param*/public void filterIllegal(String param){List<String> illegalStrings = JgmesFilterSpecialCharUtil.existsSpecialChar(param);if(illegalStrings != null && illegalStrings.size() > 0){String illegalString = StringUtils.join(illegalStrings.toArray(), ",");throw new RuntimeException("非法字符被拦截："+ illegalString);}}
}


创建一个拦截器

import com.alibaba.fastjson.JSONObject;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Map;/*** @author Zh* @version v1.0* @description:* @date 2020/8/5 16:21*/
@WebFilter(filterName = "specialCharFilter", urlPatterns = {"/base-form-template-data/*", "/base-form-template/*", "/base-table/*"})
public class specialCharFilter implements Filter {private BodyReaderHttpServletRequestWrapper wrapper;/*** 初始化拦截器* @param filterConfig* @throws ServletException*/@Overridepublic void init(FilterConfig filterConfig) throws ServletException {System.out.println("初始化过滤器");}/*** 进行拦截操作* @param servletRequest* @param servletResponse* @param filterChain* @throws IOException* @throws ServletException*/@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) servletRequest;// 在wrapper中过滤post请求wrapper = new BodyReaderHttpServletRequestWrapper(request);// 过滤get请求filterGetSpace(request);filterChain.doFilter(wrapper, servletResponse);}/*** 过滤get请求* @param request*/public void filterGetSpace(HttpServletRequest request){Map param = request.getParameterMap();String paramStr = JSONObject.toJSONString(param);wrapper.filterIllegal(paramStr);}/*** 拦截器销毁*/@Overridepublic void destroy() {}
}