Java利用JavaCPP调用算法示例

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本文主要介绍了Java利用JavaCPP调用算法示例，文中通过示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
目录

• 配置liunx 环境系统
  
• 配置java 项目
  

配置liunx 环境系统

配置so 文件存放路径
[root@arch2 ~]# cat /etc/ld.so.conf.d/so.conf 
/opt/app/tools/so/
 
从新调用ldconfig 命令
ldconfig

配置java 项目
配置pom 文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
 <modelVersion>4.0.0</modelVersion>
 
 <groupId>org.jacdong</groupId>
 <artifactId>javacpptest</artifactId>
 <version>0.1-SNAPSHOT</version>
 
   <properties>
   
    <include.path>${basedir}/cppbuild</include.path>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <javacpp.cppbuild.skip>true
    </javacpp.cppbuild.skip> <!-- To skip execution of cppbuild.sh: -Djavacpp.cppbuild.skip=true -->
    <javacpp.parser.skip>false
    </javacpp.parser.skip>   <!-- To skip header file parsing phase: -Djavacpp.parser.skip=true  -->
    <javacpp.compiler.skip>true
    </javacpp.compiler.skip> <!-- To skip native compilation phase: -Djavacpp.compiler.skip=true -->
    <javacpp.moduleId>${project.artifactId}</javacpp.moduleId>
    <javacpp.platform.root></javacpp.platform.root>
    <javacpp.platform.compiler></javacpp.platform.compiler>
    <javacpp.platform.extension></javacpp.platform.extension>
    <javacpp.platform.linux-x86>linux-x86</javacpp.platform.linux-x86>
    <javacpp.platform.linux-x86_64>linux-x86_64</javacpp.platform.linux-x86_64>
    <javacpp.platform>linux-x86_64</javacpp.platform>
 
    <skipTests>true</skipTests>
 
  </properties>
 
 <dependencies>
  <dependency>
   <groupId>org.bytedeco</groupId>
   <artifactId>javacpp</artifactId>
   <version>1.5.3</version>
  </dependency>
  <!-- https://mvnrepository.com/artifact/junit/junit -->
  <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.12</version>
   <scope>test</scope>
  </dependency>
 </dependencies>
 
 <build>
  <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
      </plugin>
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <version>3.1.0</version>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>2.10</version>
      </plugin>
      <plugin>
        <groupId>org.bytedeco</groupId>
        <artifactId>javacpp</artifactId>
        <version>1.5.3</version>
        <configuration>
          <properties>${javacpp.platform}</properties>
          <propertyKeysAndValues>
            <property>
              <name>platform.root</name>
              <value>${javacpp.platform.root}</value>
            </property>
            <property>
              <name>platform.compiler</name>
              <value>${javacpp.platform.compiler}</value>
            </property>
            <property>
              <name>platform.extension</name>
              <value>${javacpp.platform.extension}</value>
            </property>
          </propertyKeysAndValues>
          <classPath>${project.build.outputDirectory}</classPath>
          <includePaths>
            <includePath>${basedir}/src/main/resources/linux-x86_64</includePath>
          </includePaths>
          <linkPaths>
          </linkPaths>
        </configuration>
        <executions>
          <execution>
            <id>javacpp.parser</id>
            <phase>generate-sources</phase>
            <goals>
              <goal>build</goal>
            </goals>
            <configuration>
               <skip>false</skip>
              <outputDirectory>${project.build.sourceDirectory}</outputDirectory>
              <classOrPackageName>com.jacdong.preset.*</classOrPackageName>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.9</version>
        <configuration>
          <forkMode>once</forkMode>
          <environmentVariables>
            <LD_LIBRARY_PATH>target/classes/linux-x86_64</LD_LIBRARY_PATH>
          </environmentVariables>
        </configuration>
      </plugin>
   <plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>exec-maven-plugin</artifactId>
  <version>1.1</version>
  <executions>
   <execution>
    <id>build-jnilib</id>
    <phase>process-classes</phase>
    <goals>
     <goal>exec</goal>
    </goals>
    <configuration>
     <executable>java</executable>   
              <commandlineArgs>-jar ./libs/javacpp-1.5.jar -Xcompiler -g -Xcompiler -ggdb -nodelete -d target/classes/linux-x86_64 -Xcompiler -I${env.JAVA_HOME}/include -Xcompiler -I${env.JAVA_HOME}/include/linux -Xcompiler -fvisibility=default -Xcompiler -rdynamic -Xcompiler -std=c++11 -classpath target/classes com.jacdong.wrapper.JavaCPPTest</commandlineArgs> 
     </configuration>
   </execution>
   
   <execution>
            <id>echoPath</id>
            <phase>install</phase>
            <goals>
              <goal>exec</goal>
            </goals>
            <configuration>
              <executable>echo</executable>
              <commandlineArgs>"sudo cp ${basedir}/target/classes/linux-x86_64/*.so /usr/lib/;sudo ldconfig"</commandlineArgs>
 
            </configuration>
          </execution>
  </executions>
   </plugin>
   <plugin>
  <artifactId>maven-clean-plugin</artifactId>
  <version>3.1.0</version>
  <configuration>
   <filesets>
    <fileset>
     <directory>src/main/java/com/jacdong/rtcm/wrapper/</directory>
     <includes>
    <include>JavaCPPTestTmp.java</include>
     </includes>
     <followSymlinks>false</followSymlinks>
    </fileset>
   </filesets>
  </configuration>
   </plugin>
  </plugins>
  <pluginManagement>
   <plugins>
  <!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
  <plugin>
   <groupId>org.eclipse.m2e</groupId>
   <artifactId>lifecycle-mapping</artifactId>
   <version>1.0.0</version>
   <configuration>
    <lifecycleMappingMetadata>
     <pluginExecutions>
    <pluginExecution>
     <pluginExecutionFilter>
      <groupId>org.bytedeco</groupId>
      <artifactId>javacpp</artifactId>
      <versionRange>
       [1.5.3,)
      </versionRange>
      <goals>
       <goal>build</goal>
      </goals>
     </pluginExecutionFilter>
     <action>
      <ignore></ignore>
     </action>
    </pluginExecution>
    <pluginExecution>
     <pluginExecutionFilter>
      <groupId>
       org.codehaus.mojo
      </groupId>
      <artifactId>
       exec-maven-plugin
      </artifactId>
      <versionRange>
       [1.1,)
      </versionRange>
      <goals>
       <goal>exec</goal>
      </goals>
     </pluginExecutionFilter>
     <action>
      <ignore></ignore>
     </action>
    </pluginExecution>
     </pluginExecutions>
    </lifecycleMappingMetadata>
   </configuration>
  </plugin>
   </plugins>
  </pluginManagement>
 </build>
</project>

配置文件当中需要主要的几点

<!--第一次生成javacpp 文件的时候，skip 一定要设置为false ，后期对于生成的类进行了处理之后，为了避免每次运行都重启，可以把skip 设置为true-->
<configuration>
  <skip>false</skip>
  <outputDirectory>${project.build.sourceDirectory}</outputDirectory>                     <classOrPackageName>com.jacdong.preset.* </classOrPackageName>
</configuration>

<!--commandlineArgs 一定不要换行-->
<configuration>
 <executable>java</executable>   
  <commandlineArgs>-jar ./libs/javacpp-1.5.jar -Xcompiler -g -Xcompiler -ggdb -nodelete -d target/classes/linux-x86_64 -Xcompiler -I${env.JAVA_HOME}/include -Xcompiler -I${env.JAVA_HOME}/include/linux -Xcompiler -fvisibility=default -Xcompiler -rdynamic -Xcompiler -std=c++11 -classpath target/classes com.jacdong.wrapper.SingleStationIono</commandlineArgs> 
</configuration>

定义自己的map 类

@Properties(target = "com.jacdong.wrapper.JavaCPPTestTmp",
value = {@Platform(include = {"javacpp.h"},
    compiler = "cpp11")})
public class JavacppMapper implements InfoMapper{
 
 public void map(InfoMap infoMap) {
    infoMap.put(new Info().cppNames("_stdcall").skip())
    .put();
}
}

注意点
在利用javacpp 的时候，经常会出现找不到so 文件的情况，这个时候，大家可以把so 文件copy 到/usr/lib 目录下，然后更改相应的权限。
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原文链接：https://blog.csdn.net/Johnny_DongBin/article/details/120967767