requestBody 多次读取
网上的做法一般是
重新封装一个 request
把初始的request的body读取后 重新写入一个 inputStream
如下
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import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Map;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import org.apache.commons.io.IOUtils;
public class ContentCachingRequestWrapper extends HttpServletRequestWrapper{
private byte[] body;
private BufferedReader reader;
private ServletInputStream inputStream;
public ContentCachingRequestWrapper(HttpServletRequest request) throws IOException{
super(request);
loadBody(request);
}
private void loadBody(HttpServletRequest request) throws IOException{
body = IOUtils.toByteArray(request.getInputStream());
inputStream = new RequestCachingInputStream(body);
}
public byte[] getBody() {
return body;
}
@Override
public ServletInputStream getInputStream() throws IOException {
if (inputStream != null) {
return inputStream;
}
return super.getInputStream();
}
@Override
public BufferedReader getReader() throws IOException {
if (reader == null) {
reader = new BufferedReader(new InputStreamReader(inputStream, getCharacterEncoding()));
}
return reader;
}
private static class RequestCachingInputStream extends ServletInputStream {
private final ByteArrayInputStream inputStream;
public RequestCachingInputStream(byte[] bytes) {
inputStream = new ByteArrayInputStream(bytes);
}
@Override
public int read() throws IOException {
return inputStream.read();
}
@Override
public boolean isFinished() {
return inputStream.available() == 0;
}
@Override
public boolean isReady() {
return true;
}
@Override
public void setReadListener(ReadListener readlistener) {
}
}
}
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这个写法有个问题就是
有些方法使用 parameterMap 获取请求参数的 会获取不到
应该改为
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import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Map;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import org.apache.commons.io.IOUtils;
public class ContentCachingRequestWrapper extends HttpServletRequestWrapper{
private byte[] body;
private final Map<String, String[]> parameterMap;
private BufferedReader reader;
private ServletInputStream inputStream;
public ContentCachingRequestWrapper(HttpServletRequest request) throws IOException{
super(request);
parameterMap = request.getParameterMap();
loadBody(request);
}
private void loadBody(HttpServletRequest request) throws IOException{
body = IOUtils.toByteArray(request.getInputStream());
inputStream = new RequestCachingInputStream(body);
}
public byte[] getBody() {
return body;
}
@Override
public Map<String, String[]> getParameterMap() {
return this.parameterMap;
}
@Override
public ServletInputStream getInputStream() throws IOException {
if (inputStream != null) {
return inputStream;
}
return super.getInputStream();
}
@Override
public BufferedReader getReader() throws IOException {
if (reader == null) {
reader = new BufferedReader(new InputStreamReader(inputStream, getCharacterEncoding()));
}
return reader;
}
private static class RequestCachingInputStream extends ServletInputStream {
private final ByteArrayInputStream inputStream;
public RequestCachingInputStream(byte[] bytes) {
inputStream = new ByteArrayInputStream(bytes);
}
@Override
public int read() throws IOException {
return inputStream.read();
}
@Override
public boolean isFinished() {
return inputStream.available() == 0;
}
@Override
public boolean isReady() {
return true;
}
@Override
public void setReadListener(ReadListener readlistener) {
}
}
}
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这样就从 parameterMap 里面获取参数的方法也可以在我们自定义的request里面获取都 请求参数了
原因是 request.getParameterMap(); 和 request.getInputStream(); 这两个方法是竞争的
不管调用哪一个 都会执行 readStarted = true;