Java使用GZIP压缩导致HTTP请求返回乱码问题解决

Java使用GZIP压缩导致HTTP请求返回乱码问题解决

目录

原因

思路

解决方法

代码

关键部分

完整代码

原因

用Java调用雪球的API,结果返回的是乱码,一番研究后发现是因为返回的数据使用了GZIP压缩,需要先解压才能得到正确数据。

思路

使用了GZIP压缩的数据在响应头里会有一项名为content-encoding的参数,值为gzip。

Java中可以使用.getHeaderField()读取响应头的参数。

如果没有这项参数,会返回null。

解决方法

用.getHeaderField("content-encoding")读取content-encoding参数的值。

如果值不为空,通过值判断是否用了gzip压缩。

使用了gzip就解压,没用就不处理。

代码 关键部分 // 获取响应头content-encoding数据,如果是gzip就解压(以后可能要改成部分对比.contains()而不是全部对比) String contentEncoding = conn.getHeaderField("content-encoding"); if((contentEncoding != null)&&(contentEncoding.equals("gzip"))){ is = new GZIPInputStream(conn.getInputStream()); }else{ is = conn.getInputStream(); } 完整代码

部分地方需要按需修改

import java.io.*; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.zip.GZIPInputStream; public class HttpURLConnectionTools { public String doPost(String URL, String jsonStr) { OutputStreamWriter out = null; BufferedReader in = null; InputStream is = null; StringBuilder result = new StringBuilder(); HttpURLConnection conn = null; try { java.net.URL url = new URL(URL); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); // 发送POST请求必须设置为true conn.setDoOutput(true); conn.setDoInput(true); // 设置连接超时时间和读取超时时间 conn.setConnectTimeout(30000); conn.setReadTimeout(10000); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("Accept", "application/json"); // 获取输出流 out = new OutputStreamWriter(conn.getOutputStream()); out.write(jsonStr); out.flush(); out.close(); // 取得输入流,并使用Reader读取 if (200 == conn.getResponseCode()) { // 获取响应头content-encoding数据,如果是gzip就解压(以后可能要改成部分对比.contains()而不是全部对比) String contentEncoding = conn.getHeaderField("content-encoding"); if((contentEncoding != null)&&(contentEncoding.equals("gzip"))){ is = new GZIPInputStream(conn.getInputStream()); }else{ is = conn.getInputStream(); } in = new BufferedReader(new InputStreamReader(is, "UTF-8")); String line; while ((line = in.readLine()) != null) { result.append(line); System.out.println(line); } } else { System.out.println("ResponseCode is an error code:" + conn.getResponseCode()); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (out != null) { out.close(); } if (in != null) { in.close(); } } catch (IOException ioe) { ioe.printStackTrace(); } } return result.toString(); } public String doGet(String URL) { HttpURLConnection conn = null; InputStream is = null; BufferedReader br = null; StringBuilder result = new StringBuilder(); try { // 创建远程url连接对象 URL url = new URL(URL); // 通过远程url连接对象打开一个连接,强转成HTTPURLConnection类 conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); // 设置连接超时时间和读取超时时间 conn.setConnectTimeout(15000); conn.setReadTimeout(60000); conn.setRequestProperty("accept-encoding","gzip, deflate, br"); conn.setRequestProperty("User-agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36 Edg/98.0.1108.62"); // 发送请求 conn.connect(); // 通过conn取得输入流,并使用Reader读取 if (200 == conn.getResponseCode()) { // 获取响应头content-encoding数据,如果是gzip就解压(以后可能要改成部分对比.contains()而不是全部对比) String contentEncoding = conn.getHeaderField("content-encoding"); if((contentEncoding != null)&&(contentEncoding.equals("gzip"))){ is = new GZIPInputStream(conn.getInputStream()); }else{ is = conn.getInputStream(); } br = new BufferedReader(new InputStreamReader(is, "UTF-8")); String line; while ((line = br.readLine()) != null) { result.append(line); System.out.println(line); } } else { System.out.println("ResponseCode is an error code:" + conn.getResponseCode()); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } finally { try { if (br != null) { br.close(); } if (is != null) { is.close(); } } catch (IOException ioe) { ioe.printStackTrace(); } conn.disconnect(); } return result.toString(); } public static void main(String[] args) { System.out.println(new HttpURLConnectionTools().doGet("https://api.66mz8.com/api/weather.php?location=%E5%8C%97%E4%BA%AC")); System.out.println(new HttpURLConnectionTools().doGet("http://api.wpbom.com/api/neran.php")); } }

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