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问题描述:从网络中抓取html页面进行解析,解析后发现产生部分中文乱码。
由来:制作csdn客户端时产生 , http://blog.csdn.net/lmj623565791/article/details/23532797 (Java环境下,使用控制台打印出是没有乱码)
于是立马检查从服务器读取的代码:
- <span style="font-size:18px;"> /**
- * 返回该链接地址的html数据
- *
- * @param urlStr
- * @return
- * @throws CommonException
- */
- public static String doGet(String urlStr) throws CommonException
- {
- StringBuffer sb = new StringBuffer();
- try
- {
- URL url = new URL(urlStr);
- HttpURLConnection conn = (HttpURLConnection) url.openConnection();
- conn.setRequestMethod("GET");
- conn.setConnectTimeout(5000);
- conn.setDoInput(true);
- conn.setDoOutput(true);
- if (conn.getResponseCode() == 200)
- {
- InputStream is = conn.getInputStream();
- int len = 0;
- byte[] buf = new byte[1024];
- while ((len = is.read(buf)) != -1)
- {
- sb.append(new String(buf, 0, len, "UTF-8"));
- }
- is.close();
- } else
- {
- throw new CommonException("访问网络失败!");
- }
- } catch (Exception e)
- {
- throw new CommonException("访问网络失败!");
- }
- return sb.toString();
- }
- </span>
发现可能是由于我采用字节流从网络读取数据,且每次读取1024个字节,读取完成后能后强制转化为字符串,又因为使用编码为UTF-8,UTF-8是一种变长码(英文1个字节,中文两个字节),所以1024可能会造成刚好截取了某个汉字的一半(前一个字节),然后转化为字符串时造成乱码。唯一不理解的在java环境下,使用控制台打印出是没有乱码的。如果你有不同的理解欢迎留言探讨。
于是把读取数据的代码从字节流改成字符流,修改后的代码为:
- <span style="font-size:18px;"> /**
- * 返回该链接地址的html数据
- *
- * @param urlStr
- * @return
- * @throws CommonException
- */
- public static String doGet(String urlStr) throws CommonException
- {
- StringBuffer sb = new StringBuffer();
- try
- {
- URL url = new URL(urlStr);
- HttpURLConnection conn = (HttpURLConnection) url.openConnection();
- conn.setRequestMethod("GET");
- conn.setConnectTimeout(5000);
- conn.setDoInput(true);
- conn.setDoOutput(true);
- if (conn.getResponseCode() == 200)
- {
- InputStream is = conn.getInputStream();
- InputStreamReader isr = new InputStreamReader(is,"UTF-8");
- int len = 0;
- char[] buf = new char[1024];
- while ((len = isr.read(buf)) != -1)
- {
- sb.append(new String(buf, 0, len));
- }
- is.close();
- isr.close();
- } else
- {
- throw new CommonException("访问网络失败!");
- }
- } catch (Exception e)
- {
- throw new CommonException("访问网络失败!");
- }
- return sb.toString();
- }
- </span>
本文转自 一点点征服 博客园博客,原文链接:http://www.cnblogs.com/ldq2016/p/6249021.html,如需转载请自行联系原作者