详解在Spring MVC或Spring Boot中使用Filter打印请求参数问题
使用spring mvc或spring boot中打印或记录日志一般使用aop记录request请求和response响应参数，在不使用aop的前提下，如果在filter中打印日志，在打印或消费请求类型为content-type:application/json的请求时，会出现严重的问题。
在spring体系中，过滤器的定义我们一般采用继承onceperrequestfilter的方式，当然也可以使用原始的filter。
错误写法一：
如果不对request和response进行处理，使用伪代码采用如下写法打印请求和响应参数（注：此时request请求类型为post，接收的是json数据）
@override
protected void dofilterinternal(httpservletrequest request, httpservletresponse
response, filterchain filterchain) throws servletexception, ioexception {
filterchain.dofilter(request, response);
printrequestlog(request);
printresonselog(response);
}
运行测试后你会发现抛出如下异常：
java.io.ioexception: stream closed
at org.apache.catalina.connector.inputbuffer.read(inputbuffer.java:359) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.connector.coyoteinputstream.read(coyoteinputstream.java:132) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
at sun.nio.cs.streamdecoder.readbytes(streamdecoder.java:284) ~[na:1.8.0_191]
at sun.nio.cs.streamdecoder.implread(streamdecoder.java:326) ~[na:1.8.0_191]
at sun.nio.cs.streamdecoder.read(streamdecoder.java:178) ~[na:1.8.0_191]
at java.io.inputstreamreader.read(inputstreamreader.java:184) ~[na:1.8.0_191]
at java.io.bufferedreader.fill(bufferedreader.java:161) ~[na:1.8.0_191]
at java.io.bufferedreader.readline(bufferedreader.java:324) ~[na:1.8.0_191]
at java.io.bufferedreader.readline(bufferedreader.java:389) ~[na:1.8.0_191]
at com.micro.backend.filter.loggingfilter.getbodystring(loggingfilter.java:60) [classes/:na]
at com.micro.backend.filter.loggingfilter.dofilterinternal(loggingfilter.java:49) [classes/:na]
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:119) [spring-web-5.1.14.release.jar:5.1.14.release]
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:193) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:166) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.requestcontextfilter.dofilterinternal(requestcontextfilter.java:100) [spring-web-5.1.14.release.jar:5.1.14.release]
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:119) [spring-web-5.1.14.release.jar:5.1.14.release]
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:193) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:166) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.formcontentfilter.dofilterinternal(formcontentfilter.java:93) [spring-web-5.1.14.release.jar:5.1.14.release]
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:119) [spring-web-5.1.14.release.jar:5.1.14.release]
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:193) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:166) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.hiddenhttpmethodfilter.dofilterinternal(hiddenhttpmethodfilter.java:94) [spring-web-5.1.14.release.jar:5.1.14.release]
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:119) [spring-web-5.1.14.release.jar:5.1.14.release]
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:193) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:166) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.springframework.web.filter.characterencodingfilter.dofilterinternal(characterencodingfilter.java:201) [spring-web-5.1.14.release.jar:5.1.14.release]
at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:119) [spring-web-5.1.14.release.jar:5.1.14.release]
at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:193) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:166) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:202) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:96) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:541) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:139) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:92) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:74) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:343) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.coyote.http11.http11processor.service(http11processor.java:367) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.coyote.abstractprocessorlight.process(abstractprocessorlight.java:65) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.coyote.abstractprotocol$connectionhandler.process(abstractprotocol.java:868) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.tomcat.util.net.nioendpoint$socketprocessor.dorun(nioendpoint.java:1639) [tomcat-embed-core-9.0.31.jar:9.0.31]
at org.apache.tomcat.util.net.socketprocessorbase.run(socketprocessorbase.java:49) [tomcat-embed-core-9.0.31.jar:9.0.31]
at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1149) [na:1.8.0_191]
at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:624) [na:1.8.0_191]
at org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run(taskthread.java:61) [tomcat-embed-core-9.0.31.jar:9.0.31]
at java.lang.thread.run(thread.java:748) [na:1.8.0_191]
错误写法二：
如果不对request和response进行处理，使用伪代码采用如下写法打印请求和响应参数（注：此时request请求类型为post，接收的是json数据）
@override
protected void dofilterinternal(httpservletrequest request, httpservletresponse
response, filterchain filterchain) throws servletexception, ioexception {
printrequestlog(request);
printresonselog(response);
filterchain.dofilter(request, response);
}
运行测试后你会发现抛出如下异常：
org.springframework.http.converter.httpmessagenotreadableexception: required request body is missing
遇到这样的问题你是不是有坐立不安、心烦意乱、百爪挠心的痛楚，不要着急，下面我给出一个解决方案。
首先我们使用装饰器模式，创建request和response两个包装类，如下：
import javax.servlet.readlistener;
import javax.servlet.servletinputstream;
import javax.servlet.servletrequest;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletrequestwrapper;
import java.io.*;
import java.nio.charset.charset;
/**
* @description: 请求包装器
* @author: liuliya
* @createdate: 2020/4/29 10:00
*/
public class requestwrapper extends httpservletrequestwrapper {
private final byte[] body;
public requestwrapper(httpservletrequest request) throws ioexception {
super(request);
body = getrequestbodystring(request).getbytes(charset.defaultcharset());
}
@override
public bufferedreader getreader() throws ioexception {
return new bufferedreader(new inputstreamreader(getinputstream()));
}
@override
public servletinputstream getinputstream() throws ioexception {
final bytearrayinputstream bais = new bytearrayinputstream(body);
return new servletinputstream() {
@override
public int read() throws ioexception {
return bais.read();
}
@override
public boolean isfinished() {
return false;
}
@override
public boolean isready() {
return false;
}
@override
public void setreadlistener(readlistener listener) {
}
};
}
public string getrequestbodystring(servletrequest request) {
stringbuilder sb = new stringbuilder();
inputstream inputstream = null;
bufferedreader reader = null;
try {
inputstream = request.getinputstream();
reader = new bufferedreader(new inputstreamreader(inputstream, charset.defaultcharset()));
string line;
while ((line = reader.readline()) != null) {
sb.append(line);
}
} catch (ioexception e) {
e.printstacktrace();
} finally {
if (inputstream != null) {
try {
inputstream.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
if (reader != null) {
try {
reader.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
}
return sb.tostring();
}
}
package com.micro.backend.filter.support;
import org.apache.commons.io.output.teeoutputstream;
import javax.servlet.servletoutputstream;
import javax.servlet.servletresponse;
import javax.servlet.writelistener;
import javax.servlet.http.httpservletresponse;
import javax.servlet.http.httpservletresponsewrapper;
import java.io.bytearrayoutputstream;
import java.io.ioexception;
import java.io.printwriter;
/**
* @description: 响应包装器
* @author: liuliya
* @createdate: 2020/4/29 10:00
*/
public class responsewrapper extends httpservletresponsewrapper {
private final bytearrayoutputstream bos = new bytearrayoutputstream();
private printwriter writer = new printwriter(bos);
public responsewrapper(httpservletresponse response) {
super(response);
}
@override
public servletresponse getresponse() {
return this;
}
@override
public servletoutputstream getoutputstream() throws ioexception {
return new servletoutputstream() {
@override
public boolean isready() {
return false;
}
@override
public void setwritelistener(writelistener listener) {
}
private teeoutputstream tee = new teeoutputstream(responsewrapper.super.getoutputstream(), bos);
@override
public void write(int b) throws ioexception {
tee.write(b);
}
};
}
@override
public printwriter getwriter() throws ioexception {
return new teeprintwriter(super.getwriter(), writer);
}
public byte[] tobytearray() {
return bos.tobytearray();
}
}
package com.micro.backend.filter.support;
import java.io.printwriter;
//printwriter是一种写入字符的一种操作类，可以写入字符，teeprintwriter继承了他，主要功能是把原始的字符流copy到branch里面。
public class teeprintwriter extends printwriter {
printwriter branch;
public teeprintwriter(printwriter main, printwriter branch) {
super(main, true);
this.branch = branch;
}
public void write(char buf[], int off, int len) {
super.write(buf, off, len);
super.flush();
branch.write(buf, off, len);
branch.flush();
}
public void write(string s, int off, int len) {
super.write(s, off, len);
super.flush();
branch.write(s, off, len);
branch.flush();
}
public void write(int c) {
super.write(c);
super.flush();
branch.write(c);
branch.flush();
}
public void flush() {
super.flush();
branch.flush();
}
}
接下来创建最重要的loggingfilter类，继承onceperrequestfilter，或者直接继承servlet中原始的filter。
package com.micro.backend.filter;
import com.micro.backend.filter.support.requestwrapper;
import com.micro.backend.filter.support.responsewrapper;
import lombok.extern.slf4j.slf4j;
import org.springframework.context.annotation.configuration;
import org.springframework.web.filter.onceperrequestfilter;
import javax.servlet.filterchain;
import javax.servlet.servletexception;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import javax.servlet.http.httpsession;
import java.io.ioexception;
import java.io.unsupportedencodingexception;
/**
* @author: liuliya
* @createdate: 2020/4/28 23:30
*/
@slf4j
@configuration
public class loggingfilter extends onceperrequestfilter {
private static final string request_prefix_name = "request请求: ";
private static final string response_prefix_name = "response请求: ";
@override
protected void dofilterinternal(httpservletrequest request, httpservletresponse response, filterchain filterchain) throws servletexception, ioexception {
request = new requestwrapper(request);
response = new responsewrapper(response);
filterchain.dofilter(request, response);
printrequestlog(request);
printresponselog((responsewrapper) response);
}
private void printrequestlog(final httpservletrequest request) {
stringbuilder msg = new stringbuilder();
msg.append(request_prefix_name);
httpsession session = request.getsession(false);
if (session != null) {
msg.append("sessionid = ").append(session.getid()).append("; ");
}
if (request.getmethod() != null) {
msg.append("method = ").append(request.getmethod()).append("; ");
}
if (request.getcontenttype() != null) {
msg.append("contenttype = ").append(request.getcontenttype()).append("; ");
}
msg.append("uri = ").append(request.getrequesturi());
if (request.getquerystring() != null) {
msg.append('?').append(request.getquerystring());
}
if (request instanceof requestwrapper && !ismultipart(request) && !isbinarycontent(request)) {
requestwrapper requestwrapper = (requestwrapper) request;
msg.append("; payload = ").append(requestwrapper.getrequestbodystring(request));
}
log.info(msg.tostring());
}
private boolean isbinarycontent(final httpservletrequest request) {
if (request.getcontenttype() == null) {
return false;
}
return request.getcontenttype().startswith("image")
|| request.getcontenttype().startswith("video")
|| request.getcontenttype().startswith("audio");
}
private boolean ismultipart(final httpservletrequest request) {
return request.getcontenttype() != null
&& request.getcontenttype().startswith("multipart/form-data");
}
private void printresponselog(final responsewrapper response) {
stringbuilder msg = new stringbuilder();
msg.append(response_prefix_name);
try {
msg.append("; payload = ")
.append(new string(response.tobytearray(), response.getcharacterencoding()));
} catch (unsupportedencodingexception e) {
log.warn("failed to parse response payload", e);
}
log.info(msg.tostring());
}
}
参考以上我整理出的代码，你就会发现奇迹！！！
为什么要这么写呢，其本质是把请求流拷贝了一份，一个供filterchain向下传递，一个来做流的消费，再有一个就是运用装饰器模式的精髓所在。
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