cn.geektool.http.HttpInputStream Maven / Gradle / Ivy
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package cn.geektool.http;
import cn.geektool.core.util.StrUtil;
import java.io.ByteArrayInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
/**
* HTTP输入流,此流用于包装Http请求响应内容的流,用于解析各种压缩、分段的响应流内容
*
* @author jd
*
*/
public class HttpInputStream extends InputStream {
/** 原始流 */
private InputStream in;
/**
* 构造
*
* @param response 响应对象
*/
public HttpInputStream(HttpResponse response) {
init(response);
}
@Override
public int read() throws IOException {
return this.in.read();
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
return this.in.read(b, off, len);
}
@Override
public long skip(long n) throws IOException {
return this.in.skip(n);
}
@Override
public int available() throws IOException {
return this.in.available();
}
@Override
public void close() throws IOException {
this.in.close();
}
@Override
public synchronized void mark(int readlimit) {
this.in.mark(readlimit);
}
@Override
public synchronized void reset() throws IOException {
this.in.reset();
}
@Override
public boolean markSupported() {
return this.in.markSupported();
}
/**
* 初始化流
*
* @param response 响应对象
*/
private void init(HttpResponse response) {
try {
this.in = (response.status < HttpStatus.HTTP_BAD_REQUEST) ? response.httpConnection.getInputStream() : response.httpConnection.getErrorStream();
} catch (IOException e) {
if (false == (e instanceof FileNotFoundException)) {
throw new HttpException(e);
}
// 服务器无返回内容,忽略之
}
// 在一些情况下,返回的流为null,此时提供状态码说明
if (null == this.in) {
this.in = new ByteArrayInputStream(StrUtil.format("Error request, response status: {}", response.status).getBytes());
return;
}
if (response.isGzip() && false == (response.in instanceof GZIPInputStream)) {
// Accept-Encoding: gzip
try {
this.in = new GZIPInputStream(this.in);
} catch (IOException e) {
// 在类似于Head等方法中无body返回,此时GZIPInputStream构造会出现错误,在此忽略此错误读取普通数据
// ignore
}
} else if (response.isDeflate() && false == (this.in instanceof InflaterInputStream)) {
// Accept-Encoding: defalte
this.in = new InflaterInputStream(this.in, new Inflater(true));
}
}
}