UrlConnection 请求乱码的解决办法

来源：互联网发布：esp8266与51单片机编辑：程序博客网时间：2024/05/18 15:56

原先的代码如下：

public class GetMessage{  private static final String v_url = "";  public static String getPostInfo(String v_methodname, String v_urlparam)    throws IOException  {    PrintWriter out = null;    BufferedReader in = null;    String result = "";    URL url = new URL(v_url + v_methodname);    URLConnection conn = url.openConnection();    conn.setRequestProperty("accept", "*/*");    conn.setRequestProperty("Accept-Charset", "UTF-8");    conn.setRequestProperty("contentType", "UTF-8");    conn.setRequestProperty("Content-type", "application/x-www-form-urlencoded;charset=UTF-8");    conn.setRequestProperty("Accept-Language", Locale.getDefault().toString());    conn.setRequestProperty(      "Accept",       "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");    conn.setConnectTimeout(5000);    conn.setReadTimeout(5000);    conn.setDoOutput(true);    //String encoding = System.getProperty("file.encoding");    out = new PrintWriter(conn.getOutputStream());    out.print(v_urlparam);    out.flush();    out.close();    result = readStrByCode(conn.getInputStream(), "UTF-8");    return result;  }  public static String readStrByCode(InputStream is, String code) {    StringBuilder builder = new StringBuilder();    BufferedReader reader = null;    String line="";    try    {      reader = new BufferedReader(new InputStreamReader(is, code));      while ((line = reader.readLine()) != null)      {        builder.append(line);      }    } catch (Exception e) {      e.printStackTrace();      try      {        reader.close();      }      catch (IOException e1) {        e1.printStackTrace();      }    }    finally    {      try      {        reader.close();      }      catch (IOException e) {        e.printStackTrace();      }    }    return builder.toString();  }}

这个在UFT-8项目里面调用没有问题，其他编码的调用就会出现乱码。经发现是这句代码引起字符集的变化
out = new PrintWriter(conn.getOutputStream()); 如果项目不是UTF-8就会转成当前环境的编码，修改成如下方式就解决问题了。

    OutputStreamWriter out = new OutputStreamWriter(conn              .getOutputStream(), "UTF-8");     out.write(v_urlparam);

如果涉及到对字段加密，需要将需要加密的字符先转成UFT-8的编码格式即：v_userid = new String(v_userid.toString().getBytes(“iso8859-1”), “utf-8”);

参考：
http://bbs.csdn.net/topics/390600822?page=1
http://bbs.csdn.net/topics/390632652?page=1

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