识别验证码并登录案例

该案例目的 利用代码模拟http请求达到登录成功实例；

1.通过获取网页验证码URL 识别验证码，目前使用到的技术为;tess4j

Maven

	<dependency>
		<groupId>net.java.dev.jna</groupId>
		<artifactId>jna</artifactId>
		<version>4.1.0</version>
	</dependency>
	
	<dependency>
		<groupId>net.sourceforge.tess4j</groupId>
			<artifactId>tess4j</artifactId>
			<version>2.0.1</version>
			<exclusions>
			<exclusion>
			<groupId>com.sun.jna</groupId>
			<artifactId>jna</artifactId>
			</exclusion>
		</exclusions>
	</dependency>

PS:尽量把这个库写在maven 最前面之前自己测试的时候老是报

java.lang.NoSuchFieldError: SIZE_T_SIZE

辗转分析良久 把这个库设置到前面就解决问题

首先获取解析验证码

这里要注意一下的是 session 和验证码绑定在一起的所以要想验证码通过得获取cookie

/**
	 * 解析图片验证码 并返回 cookie 和验证码
	 * */
	public  String[] orcImage(String url){
		String[] ary = new String[2];
		InputStream inputStream=null;
		try {  
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			HttpURLConnection  connection =  (HttpURLConnection) realUrl.openConnection();
			if (connection.getResponseCode()!=200){
				return null;
			}
			inputStream = connection.getInputStream();
			String str = connection.getHeaderField("Set-Cookie").split(";")[0];
			ary[0] = str;
//			downloadJPG(inputStream);
			BufferedImage bi = ImageIO.read(inputStream);  
			ITesseract instance = new Tesseract();  // JNA Interface Mapping  
			File tessDataFolder = LoadLibs.extractTessResources("tessdata");
			instance.setDatapath(tessDataFolder.getAbsolutePath());
			instance.setLanguage("eng");//英文库识别数字比较准确
            String result = instance.doOCR(bi); 
            ary[1] = result.trim();
            return ary;
         } catch (Exception e) { 
        	 log.error("解析验证码失败！{}",e);
        	 return null;
         } finally {
             try {
				inputStream.close();
			} catch (IOException e) {
			}
		}
	}

解析成功后在调用登录请求

/**
	 * 登录动作
	 * */
	public String login(String url,String codeUrl,String param){
		String[] rel = orcImage(codeUrl);
		param = param+"&inVerifyID="+rel[1];
		BufferedReader in = null;
		String cookie = null;
		try {
			String urlNameString = url + "?" + param;
			log.info("GET 请求：{}",urlNameString);
			URL realUrl = new URL(urlNameString);
			// 打开和URL之间的连接
			URLConnection  connection =  realUrl.openConnection();
			// 设置通用的请求属性
			connection.setRequestProperty("Accept", "*/*");
			connection.setRequestProperty("Accept-Encoding", "gzip,deflate");
			connection.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2");
			connection.setRequestProperty("Connection", "keep-alive");
			connection.setRequestProperty("Host", "www.scsqzx.com");
			connection.setRequestProperty("Cookie",rel[0]);
			connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0");
			// 建立实际的连接
			connection.connect();
			String encoding = connection.getContentEncoding();
//			  //因为返回的是gzip 的数据所以要解析出来
			String xmlStr = readStream(connection,encoding);
                       //因为解析出来的数据是XML 格式的所以解析xml
			String code = xml.getText("Result", xmlStr);
			if(code != null && code.equals("1054")){
				cookie = rel[0];
			}else{
				log.error("登录返回状态{},cookie:{}",xmlStr,rel[0]);
			}
		} catch (Exception e) {
			log.error("登录异常：",e);
		}
		finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
			}
		}
		
		return cookie;
		
	}

该实例流程完毕