java下载html页面---把网页内容保存成本地html

我们在前面讲到httpclient抓取网页内容的时候 通常都是获取到页面的源代码content存入数据库。

详见下文:

HTTPClient模块的HttpGet和HttpPost

httpclient常用基本抓取类

那么如果我们除了获得页面源代码之外 还想把页面保存到本地存成html应该怎么做呢？

其实很简单 我们先来看访问页面获取content的代码

	private static String getUrlContent(DefaultHttpClient httpPostClient,
			String urlString) throws IOException, ClientProtocolException {
		HttpGet httpGet = new HttpGet(urlString);
		HttpResponse httpGetResponse = httpPostClient.execute(httpGet);// 其中HttpGet是HttpUriRequst的子类
		httpPostClient.getParams().setParameter(
				CoreConnectionPNames.CONNECTION_TIMEOUT, 10000);// 连接时间20s
		httpPostClient.getParams().setParameter(
				CoreConnectionPNames.SO_TIMEOUT, 8000);// 数据传输时间60s
		if (httpGetResponse.getStatusLine().getStatusCode() == 200) {
			HttpEntity httpEntity = httpGetResponse.getEntity();
			if (httpEntity.getContentEncoding() != null) {
				if ("gzip".equalsIgnoreCase(httpEntity.getContentEncoding()
						.getValue())) {
					httpEntity = new GzipDecompressingEntity(httpEntity);
				} else if ("deflate".equalsIgnoreCase(httpEntity
						.getContentEncoding().getValue())) {
					httpEntity = new DeflateDecompressingEntity(httpEntity);
				}
			}
			String result = enCodetoString(httpEntity, encode);// 取出应答字符串
			// System.out.println(result);
			return result;
		}
		return "";
	}

	public static String enCodetoStringDo(final HttpEntity entity,
			Charset defaultCharset) throws IOException, ParseException {
		if (entity == null) {
			throw new IllegalArgumentException("HTTP entity may not be null");
		}
		InputStream instream = entity.getContent();
		if (instream == null) {
			return null;
		}
		try {
			if (entity.getContentLength() > Integer.MAX_VALUE) {
				throw new IllegalArgumentException(
						"HTTP entity too large to be buffered in memory");
			}
			int i = (int) entity.getContentLength();
			if (i < 0) {
				i = 4096;
			}
			Charset charset = null;
			try {
				// ContentType contentType = ContentType.get(entity);
				// if (contentType != null) {
				// charset = contentType.getCharset();
				// }
			} catch (final UnsupportedCharsetException ex) {
				throw new UnsupportedEncodingException(ex.getMessage());
			}
			if (charset == null) {
				charset = defaultCharset;
			}
			if (charset == null) {
				charset = HTTP.DEF_CONTENT_CHARSET;
			}
			Reader reader = new InputStreamReader(instream, charset);
			CharArrayBuffer buffer = new CharArrayBuffer(i);
			char[] tmp = new char[1024];
			int l;
			while ((l = reader.read(tmp)) != -1) {
				buffer.append(tmp, 0, l);
			}
			return buffer.toString();
		} finally {
			instream.close();
		}
	}

我们得到content之后就可以直接 把它存成本地文件 就 可以了。

我们可以参考

 

java读写txt

把txt后缀改成html即可

 public static void writeToFile(String fileName, String content) {
         String time = DATE_FORMAT.format(Calendar.getInstance().getTime());

         File dirFile = null;
         try {
             dirFile = new File("e:\\" + time);
             if (!(dirFile.exists()) && !(dirFile.isDirectory())) {
                 boolean creadok = dirFile.mkdirs();
                 if (creadok) {
                     System.out.println(" ok:创建文件夹成功！ ");
                 } else {
                     System.out.println(" err:创建文件夹失败！ ");
                 }
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
         String fullPath = dirFile + "/" + fileName + ".txt";
         write(fullPath, content);
     }

     /**
      * 写文件
      *
      * @param path
      * @param content
      */
     public static boolean write(String path, String content) {
         String s = new String();
         String s1 = new String();
         BufferedWriter output = null;
         try {
             File f = new File(path);
             if (f.exists()) {
             } else {
                 System.out.println("文件不存在，正在创建...");
                 if (f.createNewFile()) {
                     System.out.println("文件创建成功！");
                 } else {
                     System.out.println("文件创建失败！");
                 }
             }
             BufferedReader input = new BufferedReader(new FileReader(f));
             while ((s = input.readLine()) != null) {
                 s1 += s + "\n";
             }
             System.out.println("原文件内容：" + s1);
             input.close();
             s1 += content;
             output = new BufferedWriter(new FileWriter(f));
             output.write(s1);
             output.flush();
             return true;
         } catch (Exception e) {
             e.printStackTrace();
             return false;
         } finally {
             if (output != null) {
                 try {
                     output.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     }