带有Spring MVC的tess4j

问题内容：

我已经尝试将tess4j作为独立的Java程序使用，并且可以正常工作以提供文本输出。

现在，我试图创建一个Spring MVC Web项目，在pom中添加tess4j的依赖项，并且在我的项目中添加了tess4j源。

File imageFile = new File("D:/Data/jars/tess/eurotext.tif");    
Tesseract instance = Tesseract.getInstance(); // JNA Interface Mapping
        // Tesseract1 instance = new Tesseract1(); // JNA Direct Mapping
        try {
            result = instance.doOCR(imageFile);
            System.out.println(result);
        } catch (TesseractException e) {
            System.err.println(e.getMessage());
        }

当我试图在项目中运行一个独立的Java程序时，上面的代码可以正常工作。因此很明显，将jar文件添加到正确构建路径中。

但是，当我在控制器映射或服务中调用代码时，它将引发运行时异常。

    SEVERE: Unsupported image format. May need to install JAI Image I/O package.
https://java.net/projects/jai-imageio/
java.lang.RuntimeException: Unsupported image format. May need to install JAI Image I/O package.
https://java.net/projects/jai-imageio/
    at net.sourceforge.vietocr.ImageIOHelper.getIIOImageList(ImageIOHelper.java:324)
    at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:173)
    at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:158)
    at com.ocr.tesseract.TesseractExample.getTextFromImage(TesseractExample.java:27)
    at com.cogz.tp.controller.HomeController.view(HomeController.java:51)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:409)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1044)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:662)
java.lang.RuntimeException: Unsupported image format. May need to install JAI Image I/O package.
https://java.net/projects/jai-imageio/

请让我知道缺少的内容。谢谢。

问题答案：

甚至我也遇到了使用tess4jfor
的类似问题DynamicWebProject。但是感谢@nguyenq的评论对我的帮助，让我可以正常工作了。tess4j通常使用TIFF处理程序进行光学识别。默认ImageIO不提供它所需的依赖关系。因此，需要jai-
imageio.jar。我所做的只是ImageIO.scanForPlugins()在调用执行的包装器类之前添加了一行doOCR。我的lib中有以下jar：-

tess4j.jar

jai_imageio.jar

ghost4j-0.3.1.jar

jna.jar

junit-4.10.jar

这是示例代码：

TessractOCR tessocr = new TessractOCR();
        ImageIO.scanForPlugins();
        String extractedString = tessocr.extractTextFromImage(binarizrImage);

功能

public static String extractTextFromImage(BufferedImage image){
        RenderedImage img = image;

        String result =null;
        try {
            File outputfile = new File("saved.png");
       ImageIO.write(img, "png", outputfile);
        Tesseract instance = Tesseract.getInstance(); // JNA Interface Mapping
        instance.setDatapath("E:\\OCR-data\\Tess4J-1.2-src\\Tess4J");

        result = instance.doOCR(outputfile);


            System.out.println(result);

        } catch (Exception e) {
            System.err.println(e.getMessage());
        }
        return result;
    }

它可以工作100％:)

带有Spring MVC的tess4j

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