关于字符编码格式

来源：互联网发布：linux postgresql 编辑：程序博客网时间：2024/05/21 07:12

1.服务器可以设置编码格式

2.nginx也可以设置编码格式

3.httpCilent工具（jar包），会先获取response中返回的Content-Type中包含的编码格式charset,如果没取到，则取httpClient工具中的default charset 为ISO-8859-1，httpclient中有给各种协议中传输数据的编码格式默认设置。如需要改变，需要在调用的时候去设置

    params.setHttpElementCharset("US-ASCII");//创建httpHeader的字符集默认值    params.setContentCharset("ISO-8859-1");//创建contentBody的字符集默认值

  public static final String CREDENTIAL_CHARSET = "http.protocol.credential-charset";  public static final String HTTP_ELEMENT_CHARSET = "http.protocol.element-charset";  public static final String HTTP_URI_CHARSET = "http.protocol.uri-charset";//http.protocol.uri-charset这个值get方法先取，取不到httpclient中设置为utf-8,初始化的时候是没值的，就会取到utf-8  public static final String HTTP_CONTENT_CHARSET = "http.protocol.content-charset";

4.String的默认编码格式和系统有关系,String 的处理是通过getByte("charset")来处理的，会根据括号里的字符格式来转换成对应的字节码，如果String当前默认编码是utf-8格式的，getbyte中用iso-8859-1会出转换成乱码。

//String responseStr = resBuffer.toString();//byte[] responseBody = responseStr.getBytes(getMethod.getResponseCharSet());

public static String httpVisit(String url, String charset) {// 构造HttpClient的实例HttpClient httpClient = new HttpClient();httpClient.setConnectionTimeout(1500);//httpClient.getParams().setParameter("http.protocol.content-charset", charset);// 创建GET方法的实例GetMethod getMethod = new GetMethod(url);getMethod.addRequestHeader("Connection", "close");try {// 执行getMethodint statusCode = httpClient.executeMethod(getMethod);if (statusCode != HttpStatus.SC_OK) {System.err.println("Method failed: " + getMethod.getStatusLine());}// 返回响应消息InputStream resStream = getMethod.getResponseBodyAsStream();long contentLength = getMethod.getResponseContentLength();if (contentLength > 2147483647L) {throw new IOException("Content too large to be buffered: " + contentLength + " bytes");}int limit = getMethod.getParams().getIntParameter("http.method.response.buffer.warnlimit", 1048576);if ((contentLength == -1L) || (contentLength > limit)) {System.out.println("Too long");}ByteArrayOutputStream outstream = new ByteArrayOutputStream(contentLength > 0L ? (int) contentLength : 4096);byte[] buffer = new byte[4096];int len;while ((len = resStream.read(buffer)) > 0) {outstream.write(buffer, 0, len);}outstream.close();String content = new String(outstream.toByteArray(), charset);//InputStream resStream = getMethod.getResponseBodyAsStream();//BufferedReader br = new BufferedReader(new InputStreamReader(resStream));//StringBuffer resBuffer = new StringBuffer();//String resTemp = "";//while ((resTemp = br.readLine()) != null) {//resBuffer.append(resTemp);//}//String responseStr = resBuffer.toString();//byte[] responseBody = responseStr.getBytes(getMethod.getResponseCharSet());//String content = new String(responseBody, charset);//byte[] responseBody1 = getMethod.getResponseBodyAsString().getBytes(getMethod.getResponseCharSet());//String content1 = new String(responseBody1, charset);//return content1;return content;} catch (HttpException e) {// 发生致命的异常，可能是协议不对或者返回的内容有问题LogHelper.exceptionLog(e);return "-1";} catch (IOException e) {// 发生网络异常LogHelper.exceptionLog(e);return "-1";} finally {try {// 释放连接getMethod.releaseConnection();httpClient.getHttpConnectionManager().closeIdleConnections(1);} catch (Exception e) {LogHelper.exceptionLog(e);}}}