OpenCV无法加载动态Web项目的库 [英] OpenCV unable to load library for a dynamic web project

问题描述

我正在准备一个有关人脸识别的Java Web项目.我正在使用OpenCV 2.4.7的Java库.当我从servlet调用FaceDetector类时，它给出了错误-

I am preparing a java web project on face recognition.I am using java library of opencv 2.4.7. when I am calling FaceDetector class from a servlet, it gives error-

java.lang.UnsatisfiedLinkError:java.library.path中没有opencv_java247 java.lang.ClassLoader.loadLibrary(ClassLoader.java:1886) java.lang.Runtime.loadLibrary0(Runtime.java:849) java.lang.System.loadLibrary(System.java:1088) Models.NewFaceDetector.(NewFaceDetector.java:24) Servlets.helloServlet.doPost(helloServlet.java:108) javax.servlet.http.HttpServlet.service(HttpServlet.java:647) javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

java.lang.UnsatisfiedLinkError: no opencv_java247 in java.library.path java.lang.ClassLoader.loadLibrary(ClassLoader.java:1886) java.lang.Runtime.loadLibrary0(Runtime.java:849) java.lang.System.loadLibrary(System.java:1088) Models.NewFaceDetector.(NewFaceDetector.java:24) Servlets.helloServlet.doPost(helloServlet.java:108) javax.servlet.http.HttpServlet.service(HttpServlet.java:647) javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

此代码在控制台Java项目中运行良好. Servlet代码是-

This code is working perfectly in console java project. Servlet Code is-

protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    PrintWriter out=response.getWriter();
    Part name=request.getPart("NameBox");
    Part img=request.getPart("Img");
    String filename=getFileName(img);
    InputStream is=img.getInputStream();
    int i=is.available();
    byte[] b=new byte[i];
    is.read(b);
    String path="E:/temp/"+filename;
    FileOutputStream os=new FileOutputStream(path);
     os.write(b);
    os.close();
    is.close();
   FaceDetector fd=new FaceDetector();
    fd.getFaces(path);  
}

我的脸部检测器课程是-

and my face detector class is-

public class FaceDetector {

static{ System.loadLibrary("opencv_java247"); }
public List<Mat> getFaces(String url) throws MalformedURLException, IOException
{
    List<Mat>faces=new ArrayList();
    Mat image = Highgui.imread(url);
    //code...
}

我给出了打开cv dll的路径--Djava.library.path ="C:\ Users \ vivek \ Documents \ NetBeansProjects \ TrendFaceRecognizer \ src \ java \ data"

I gave the path to open cv dll- -Djava.library.path="C:\Users\vivek\Documents\NetBeansProjects\TrendFaceRecognizer\src\java\data"

我不知道我在做什么.

推荐答案

如何解决java.lang.UnsatisfiedLinkError
用户应检查是否-

How to resolve java.lang.UnsatisfiedLinkError
User should check whether-

• System.loadLibrary传递了错误的参数:

• System.loadLibrary is passed an incorrect parameter:

• Windows:要加载Name.dll，必须将Name传递给loadLibrary方法.

• Windows: To load Name.dll, Name is passed to the loadLibrary method.

AIX，HP-UX，Solaris，Linux:要加载libName.so或libName.a，必须传递libName
到loadLibrary方法

AIX, HP-UX, Solaris, Linux: To load libName.so or libName.a, libName is passed
to the loadLibrary method

本地库已加载-

如果本机库已由相同的应用程序加载了
应用程序尝试再次加载它，这可能导致此错误.

If the native library was already loaded by an application and the same
application tries to load it again, this can cause this error.

参考:调试java.lang.UnsatisfiedLinkError

在您的情况下， 1)检查您的servlet(可能在不同的程序包中)是否可以访问\ TrendFaceRecognizer \ src \ java \ data

and in your case, 1)check whether your servlet(might be in different package) that could access the dll in \TrendFaceRecognizer\src\java\data

2)代替System.loadLibrary("opencv_java247")尝试使用System.load("opencv_java247").似乎loadLibrary使用默认路径，而负载将使用绝对路径

2)Instead System.loadLibrary("opencv_java247") try using System.load("opencv_java247") .It seems loadLibrary uses default path and load will use absolute path

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