基于阿里云API的图像文字识别
首先你在阿里云购买一个图像识别的API(500次免费)，它会给你一个Appcode，拿到这个Appcode，我们在项目中会用到它。我用的是这个:印刷文字识别－文档小说图片文字识别
识别的逻辑：
我们通过Java的I/O操作获取图片文件，然后将该文件转化为Base64编码，然后用它请求Api的调用地址，获取返回Json后，解析Json，把结果输出到文件，并输出到控制台
很简单对不对！我写了一个Demo放在了GitHub上，链接是https://github.com/theazet/ocr，我们看一下实际的运行代码
/**
* 工具类
*/
public class Utils {
/**
* 输出获取的Json返回值，并把它输出到控制台和文件
* @param content 获取的Json返回值
*/
public static void output(String content) {
System.out.println(content);
File file = new File("D:\\result.txt"); //这里选择输出文件的地址
try {
FileWriter writer = new FileWriter(file, true);
writer.write(content);
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 解析Json
* @param string 获取response中的Json
*/
public static void prase(String string){
JSONObject jsonObject=JSONObject.parseObject(string);
JSONArray jsonArray=jsonObject.getJSONArray("prism_wordsInfo");
for (int i=0;i//Http请求的工具类
public class HttpUtils {
public static HttpResponse doPost(String host, String path, String method,
Map headers,
Map querys,
String body)
throws Exception {
HttpClient httpClient = wrapClient(host);
HttpPost request = new HttpPost(buildUrl(host, path, querys));
for (Map.Entry e : headers.entrySet()) {
request.addHeader(e.getKey(), e.getValue());
}
if (StringUtils.isNotBlank(body)) {
request.setEntity(new StringEntity(body, "utf-8"));
}
return httpClient.execute(request);
}
private static String buildUrl(String host, String path, Map querys) throws UnsupportedEncodingException {
StringBuilder sbUrl = new StringBuilder();
sbUrl.append(host);
if (!StringUtils.isBlank(path)) {
sbUrl.append(path);
}
if (null != querys) {
StringBuilder sbQuery = new StringBuilder();
for (Map.Entry query : querys.entrySet()) {
if (0 < sbQuery.length()) {
sbQuery.append("&");
}
if (StringUtils.isBlank(query.getKey()) && !StringUtils.isBlank(query.getValue())) {
sbQuery.append(query.getValue());
}
if (!StringUtils.isBlank(query.getKey())) {
sbQuery.append(query.getKey());
if (!StringUtils.isBlank(query.getValue())) {
sbQuery.append("=");
sbQuery.append(URLEncoder.encode(query.getValue(), "utf-8"));
}
}
}
if (0 < sbQuery.length()) {
sbUrl.append("?").append(sbQuery);
}
}
return sbUrl.toString();
}
private static HttpClient wrapClient(String host) {
HttpClient httpClient = new DefaultHttpClient();
if (host.startsWith("https://")) {
sslClient(httpClient);
}
return httpClient;
}
private static void sslClient(HttpClient httpClient) {
try {
SSLContext ctx = SSLContext.getInstance("TLS");
X509TrustManager tm = new X509TrustManager() {
public X509Certificate[] getAcceptedIssuers() {
return null;
}
public void checkClientTrusted(X509Certificate[] xcs, String str) {
}
public void checkServerTrusted(X509Certificate[] xcs, String str) {
}
};
ctx.init(null, new TrustManager[] { tm }, null);
SSLSocketFactory ssf = new SSLSocketFactory(ctx);
ssf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
ClientConnectionManager ccm = httpClient.getConnectionManager();
SchemeRegistry registry = ccm.getSchemeRegistry();
registry.register(new Scheme("https", 443, ssf));
} catch (KeyManagementException ex) {
throw new RuntimeException(ex);
} catch (NoSuchAlgorithmException ex) {
throw new RuntimeException(ex);
}
}
} public class StartOcr {
public static void main(String[] args) {
String host = "https://ocrapi-document.taobao.com";
String path = "/ocrservice/document";
String method = "POST";
String appcode = "这里填写你的AppCode";
Map headers = new HashMap();
headers.put("Authorization", "APPCODE " + appcode);
headers.put("Content-Type", "application/json; charset=UTF-8");
Map querys = new HashMap();
String bodys = null;
try {
bodys = "{\"img\":\""+ changeToBase64("D:\\ocr.jpg")+"\",\"prob\":false}"; //这里输入图片文件地址
} catch (Exception e) {
e.printStackTrace();
}
try {
HttpResponse response = HttpUtils.doPost(host, path, method, headers, querys, bodys);
prase(EntityUtils.toString(response.getEntity()));
} catch (Exception e) {
e.printStackTrace();
}
}
} 这里我是通过Maven构建的项目，贴上pom.xml文件
4.0.0
war
Ocr
Ocr
1.0-SNAPSHOT
com.alibaba
fastjson
1.2.15
org.apache.httpcomponents
httpclient
4.2.1
org.apache.httpcomponents
httpcore
4.2.1
commons-lang
commons-lang
2.6
org.eclipse.jetty
jetty-util
9.3.7.v20160115
junit
junit
4.5
test
org.apache.maven.plugins
maven-jar-plugin
com.example.ocr.StartOcr
true
lib/
测试用例
输出结果
