python challenge challenge2之java解

第2题
1，需要查看页面源代码，源代码里有说明，在冗长的非字母字符里找到字母，就是进入下一题的答案
2，因为我们神奇国度的原因，有时网络不稳定，会被G*F*W，所以使用了代理。如果不需要代理，把设置代理的语句注释掉即可
3，使用两种方式来获得结果。一种使用原生的java代码，另一种用Apache common HttpClient 的jar包(附件里)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;



public class Challenge2Search {
	@SuppressWarnings("unused")
	private final static String alphabet = "abcdefghijklmnopqrstuvwxyz";
	
	public static void main(String[] args) throws IOException, InterruptedException {
		// set proxy
		System.getProperties().setProperty("proxyHost", "127.0.0.1");
		System.getProperties().setProperty("proxyPort", "8580");
		
		URL url = new URL("http://www.pythonchallenge.com/pc/def/ocr.html");
		BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));
		int i = reader.read();
		StringBuilder builder = new StringBuilder();
		while(i!= -1){
			if((i <= 'z' && i >= 'a')||(i <= 'Z' && i >= 'A')){
				builder.append((char)i);
			}
			i = reader.read();
		}
		String builderString = builder.toString();
		System.out.println(" result = " + builderString.substring(builderString.indexOf("below")+5));
		
		// close proxy
		System.getProperties().setProperty("proxyHost", "");
		System.getProperties().setProperty("proxyPort", "");
		
		
//		HttpClient client = new HttpClient(); 
                // set proxy
//		client.getHostConfiguration().setProxy("127.0.0.1", 8580);
		
//		GetMethod get = new GetMethod("http://www.pythonchallenge.com/pc/def/ocr.html");
//		client.executeMethod(get);
//		String pageInfo = get.getResponseBodyAsString();
//		get.releaseConnection();
//		System.out.println("result = " + getAlphabetFromString(subStr(pageInfo)));
	}
	
	
	public static String getAlphabetFromString(String str){
		StringBuilder out = new StringBuilder();
	    for(int i = 0 ; i < str.length(); i++){
//	    	int asciiChar = (int)str.charAt(i);
	    	if(alphabet.indexOf(str.charAt(i))!=-1)
	    	    out.append(str.charAt(i));
	    }
		return out.toString();
	}
	
	public static String subStr(String str){
		String includeReturnStr = str.substring(str.lastIndexOf("<!--")+4, str.lastIndexOf("-->"));
		return includeReturnStr;
	}
}