getInputStream() has already been called for this request解决方法二

HttpServletRequest读取流的时候，出现如标题所示无法再读或者读出来表现为空的情况，是由于在框架或者其他地方已经读了一次。

在上一篇中用了一种方式处理；在上一种方式中，把HttpServletRequest全部实例化为MyRequestWrapper，用来保存副本；个人始终觉得不是很好。

今晚回家，思考了一下，用另外一种方式进行了处理，最终效果一致；记录如下：

package net.dlet.dhdemo.configure;import net.dlet.dhdemo.utils.dhutils.CarHttpServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** @Description: 自定义servlet配置类* @PackageName: net.dlet.dhdemo.configure* @Name: CarServletConfig* @Author: crue* @CreateDate: 2020/09/07 21:24* @DayNameFull: 星期一* @ProjectName: dhdemo* @Version: 1.0**/
@Configuration
public class CarServletConfig {@Beanpublic ServletRegistrationBean servletRegistrationBean() {//注册自定义servletServletRegistrationBean registrationBean = new ServletRegistrationBean(new CarHttpServlet());registrationBean.addUrlMappings("/ipms/DH/Devices/1000019$0/Events", "/DH/Devices/1000019$0/Events");return registrationBean;}
}

package net.dlet.dhdemo.utils.dhutils;import net.dlet.dhdemo.service.TestService;
import net.dlet.dhdemo.utils.SpringUtil;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;/*** @Description: 自定义servlet* 注意: urlPatterns 这里必须排列在一行，不能主动换行* @PackageName: net.dlet.dhdemo.utils.dhutils* @Name: HttpServletRequest* @Author: crue* @CreateDate: 2020/09/07 21:33* @DayNameFull: 星期一* @ProjectName: dhdemo* @Version: 1.0**/
//@WebServlet(name = "CarHttpServlet", urlPatterns = {"/ipms/DH/Devices/**","/DH/Devices/**"})
public class CarHttpServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {super.doGet(req, resp);}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {TestService testService = SpringUtil.getBean(TestService.class);testService.dealDhDataCustom(req, resp);}}

1、TestService中dealDhDataCustom函数实现如下：

 public String dealDhDataCustom(HttpServletRequest servletRequest, HttpServletResponse response) throws IOException {String encoding = "ISO-8859-1";//取Body数据 读出数据流
//        String[] inputStream = IOUtils.readLines(servletRequest.getInputStream());byte[] buffer = StreamUtils.getByteByStream(servletRequest.getInputStream(), servletRequest.getContentLength(), encoding);return dealBuffer(servletRequest, buffer, encoding);
}

2、StreamUtils类如下：

package net.dlet.dhdemo.utils.dhutils;import java.io.*;/*** @Description: 处理InputStream流的工具类* @PackageName: net.dlet.dhdemo.utils.dhutils* @Name: StreamUtils* @Author: crue* @CreateDate: 2020/09/06 14:43* @DayNameFull: 星期日* @ProjectName: dhdemo* @Version: 1.0**/
public class StreamUtils {/*** 读取流中的数据将其转换为byte数组* @param is 输入流* @param contentLength 内容的长度* @param encodeing 编码方式* @return byte数组* @throws IOException 读或者写可能出现io异常*/public static byte[] getByteByStream(InputStream is, int contentLength, String encodeing) throws IOException {ByteArrayOutputStream outSteam = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = -1;while ((len = is.read(buffer)) != -1) {outSteam.write(buffer, 0, len);}outSteam.close();is.close();return outSteam.toByteArray();}
}

值得注意的是，在用@WebServlet注解的时候，开始的时候为了美观，把urlPatterns后面的参数换行格式化了一下。然而模拟发送数据，死活无法进去，后面只好排成一排。

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