java 读取外网url问题

来源：互联网发布：2018年淘宝卖什么好编辑：程序博客网时间：2024/06/06 15:03

起初用httpurl读取外网静态json文件，总是返回状态500，当服务器tomcat重新启动就没有问题了，但是过些时间又不行了，后来查看浏览器的请求头，用gzip格式压缩后，回来界面发现就没这个问题了，原因还不知道，但问题总算解决了

private static String readhttp_info(String httpUrl) {

StringBuffer strBuffer = new StringBuffer("");
HttpURLConnection httpURLConnection = null;
InputStream inputStream = null;
BufferedReader rufferedReader = null;
//用于解码
GZIPInputStream gzin = null;

try {
URL serverUrl = new URL(httpUrl);
httpURLConnection = (HttpURLConnection) serverUrl.openConnection();
//设置请求的头信息
httpURLConnection.setRequestProperty("Accept-charset", "utf-8");
httpURLConnection.setRequestProperty("Accept", "text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01");
httpURLConnection.setRequestProperty("Accept-Encoding", "gzip, deflate");
httpURLConnection.setRequestProperty("Accept-Language", "zh-CN,en-US;q=0.8,zh;q=0.5,en;q=0.3");
httpURLConnection.setRequestProperty("Connection","keep-alive");
httpURLConnection.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0");
System.out.println("请求url的响应状态码:"+httpURLConnection.getResponseCode());
//状态码200是请求成功
if (HttpURLConnection.HTTP_OK == httpURLConnection.getResponseCode()) {
inputStream = httpURLConnection.getInputStream();
System.out.println("服务器响应的内容的编码格式:"+httpURLConnection.getContentEncoding());
//转码
gzin = new GZIPInputStream(inputStream);
rufferedReader = new BufferedReader(new InputStreamReader(
gzin,"utf-8"));
String str = null;
while ((str = rufferedReader.readLine()) != null) {
strBuffer.append(str);
strBuffer.append("\r\n");
}
System.out.println(strBuffer);
}
}catch(Exception e) {
e.printStackTrace();
}finally{
httpURLConnection.disconnect();
//这里把相关的流也关闭吧，我这里就不写了
}

return strBuffer.toString();
}

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