如何在Spring Boot中获得完整的HttpServletResponse响应体？

我想获得HttpServletResponse的返回内容以供登录自定义拦截器。开发环境是Spring Boot 1.5.6 + Java 8 + Embeded Tomcat 8.0.35，并且返回的内容是RESTful接口的json字符串。这是我的代码获取http回应内容：如何在Spring Boot中获得完整的HttpServletResponse响应体？

/** 
* get Response return json content 
* 
* @param response 
* @return 
* @throws IOException 
* @throws NoSuchFieldException 
* @throws IllegalAccessException 
*/ 
public String getResponseContent(HttpServletResponse response) throws IOException, NoSuchFieldException, IllegalAccessException { 
    String responseContent = null; 
    CoyoteOutputStream outputStream = (CoyoteOutputStream) response.getOutputStream(); 
    Class<CoyoteOutputStream> coyoteOutputStreamClass = CoyoteOutputStream.class; 
    Field obField = coyoteOutputStreamClass.getDeclaredField("ob"); 
    if (obField.getType().toString().endsWith("OutputBuffer")) { 
     obField.setAccessible(true); 
     org.apache.catalina.connector.OutputBuffer outputBuffer = (org.apache.catalina.connector.OutputBuffer) obField.get(outputStream); 
     Class<org.apache.catalina.connector.OutputBuffer> opb = org.apache.catalina.connector.OutputBuffer.class; 
     Field outputChunkField = opb.getDeclaredField("outputChunk"); 
     outputChunkField.setAccessible(true); 
     if (outputChunkField.getType().toString().endsWith("ByteChunk")) { 
      ByteChunk bc = (ByteChunk) outputChunkField.get(outputBuffer); 
      Integer length = bc.getLength(); 
      if (length == 0) return null; 
      responseContent = new String(bc.getBytes(), "UTF-8"); 
      Integer responseLength = StringUtils.isBlank(responseContent) ? 0 : responseContent.length(); 
      if (responseLength < length) { 
       responseContent = responseContent.substring(0, responseLength); 
      } else { 
       responseContent = responseContent.substring(0, length); 
      } 

     } 
    } 
    return responseContent; 
}

当响应JSON是短，运行well.But当返回JSON过长的代码，只有具有响应内容的一部分，解析内容responseContent记录（需要分析之前失败json并获得一些值写入数据库）。

如何调整响应并获得完整响应内容？

来源

2017-09-02 Dolphin

您是否计算了响应大小并检查了您的tomcat响应限制 – CHiRAG

阅读此：https://stackoverflow.com/questions/33744875/spring-boot-how-to-log-all-requests-and-responses-with -exceptions输入单-PL –

适当增加tomcat的defult缓冲区大小：

//default buffer size is:8*1024,in OutputBuffer class 
//public static final int DEFAULT_BUFFER_SIZE = 8*1024;   
response.setBufferSize(2048 * 20);

这不是一个完美的解决方案，当响应大小超过2048 * 20，它将encount的exception.But可以处理大多数的回应。

来源

2017-09-02 09:38:35 Dolphin

如何在Spring Boot中获得完整的HttpServletResponse响应体？

回答

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