java下载html页面---把网页内容保存成本地html

Posted 2022-09-08 张小凡vip

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

1. public static void writeToFile(String fileName, String content)   
2.         String time = DATE_FORMAT.format(Calendar.getInstance().getTime());  
3.           
4.         File dirFile = null;  
5.         try   
6.             dirFile = new File("e:\\\\" + time);  
7.             if (!(dirFile.exists()) && !(dirFile.isDirectory()))   
8.                 boolean creadok = dirFile.mkdirs();  
9.                 if (creadok)   
10.                     System.out.println(" ok:创建文件夹成功！ ");  
11.                  else   
12.                     System.out.println(" err:创建文件夹失败！ ");  
13.                   
14.               
15.          catch (Exception e)   
16.             e.printStackTrace();  
17.           
18.         String fullPath = dirFile + "/" + fileName + ".txt";  
19.         write(fullPath, content);  
20.       
21.   
22.     /** 
23.      * 写文件 
24.      *  
25.      * @param path 
26.      * @param content 
27.      */  
28.     public static boolean write(String path, String content)   
29.         String s = new String();  
30.         String s1 = new String();  
31.         BufferedWriter output = null;  
32.         try   
33.             File f = new File(path);  
34.             if (f.exists())   
35.              else   
36.                 System.out.println("文件不存在，正在创建...");  
37.                 if (f.createNewFile())   
38.                     System.out.println("文件创建成功！");  
39.                  else   
40.                     System.out.println("文件创建失败！");  
41.                   
42.               
43.             BufferedReader input = new BufferedReader(new FileReader(f));  
44.             while ((s = input.readLine()) != null)   
45.                 s1 += s + "\\n";  
46.               
47.             System.out.println("原文件内容：" + s1);  
48.             input.close();  
49.             s1 += content;  
50.             output = new BufferedWriter(new FileWriter(f));  
51.             output.write(s1);  
52.             output.flush();  
53.             return true;  
54.          catch (Exception e)   
55.             e.printStackTrace();  
56.             return false;  
57.          finally   
58.             if (output != null)   
59.                 try   
60.                     output.close();  
61.                  catch (IOException e)   
62.                     e.printStackTrace();  
63.                   
64.               
65.           
66.