java - 如何从 Spring Boot 过滤器中的 servletResponse 获取响应正文
问题描述
我想在传递给客户端之前从中获取哈希签名Response Body
。ServletResponse
我没有办法做到这一点。为了从我那里获取请求正文,ServletRequest
我已经实现如下:
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
public class RequestWrapper extends HttpServletRequestWrapper{
private final String body;
public RequestWrapper(HttpServletRequest request) throws IOException
{
//So that other request method behave just like before
super(request);
StringBuilder stringBuilder = new StringBuilder();
BufferedReader bufferedReader = null;
try {
InputStream inputStream = request.getInputStream();
if (inputStream != null) {
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
char[] charBuffer = new char[128];
int bytesRead = -1;
while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
stringBuilder.append(charBuffer, 0, bytesRead);
}
} else {
stringBuilder.append("");
}
} catch (IOException ex) {
throw ex;
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException ex) {
throw ex;
}
}
}
//Store request pody content in 'body' variable
body = stringBuilder.toString();
}
@Override
public ServletInputStream getInputStream() throws IOException {
final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());
ServletInputStream servletInputStream = new ServletInputStream() {
public int read() throws IOException {
return byteArrayInputStream.read();
}
@Override
public boolean isFinished() {
return false;
}
@Override
public boolean isReady() {
return false;
}
@Override
public void setReadListener(ReadListener listener) {
}
};
return servletInputStream;
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader(new InputStreamReader(this.getInputStream()));
}
//Use this method to read the request body N times
public String getBody() {
return this.body;
}
}
我该怎么做类似于ServletResponse
?
解决方案
我ContentCachingResponseWrapper
在过滤器中实现了从以下获取响应正文ServletResponse
:
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
ContentCachingResponseWrapper responseCacheWrapperObject = new ContentCachingResponseWrapper((HttpServletResponse) servletResponse);
filterChain.doFilter(servletRequest, responseCacheWrapperObject);
byte[] responseArray = responseCacheWrapperObject.getContentAsByteArray();
String responseStr = new String(responseArray, responseCacheWrapperObject.getCharacterEncoding());
//....use responsestr to make the signature
responseCacheWrapperObject.copyBodyToResponse();
}
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