Java利用JavaCPP調(diào)用算法示例

更新時(shí)間：2021年10月28日 10:15:15 作者：jacdong

本文主要介紹了Java利用JavaCPP調(diào)用算法示例，文中通過示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

配置liunx 環(huán)境系統(tǒng)

配置so 文件存放路徑
[root@arch2 ~]# cat /etc/ld.so.conf.d/so.conf 
/opt/app/tools/so/

從新調(diào)用ldconfig 命令
ldconfig

配置java 項(xiàng)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>

配置文件當(dāng)中需要主要的幾點(diǎn)

<!--第一次生成javacpp 文件的時(shí)候，skip 一定要設(shè)置為false ，后期對(duì)于生成的類進(jìn)行了處理之后，為了避免每次運(yùn)行都重啟，可以把skip 設(shè)置為true-->
<configuration>
    <skip>false</skip>
    <outputDirectory>${project.build.sourceDirectory}</outputDirectory>                                       <classOrPackageName>com.jacdong.preset.* </classOrPackageName>
</configuration>

<!--commandlineArgs 一定不要換行-->
<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>

定義自己的map 類

@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();
}
}

注意點(diǎn)

在利用javacpp 的時(shí)候，經(jīng)常會(huì)出現(xiàn)找不到so 文件的情況，這個(gè)時(shí)候，大家可以把so 文件copy 到/usr/lib 目錄下，然后更改相應(yīng)的權(quán)限。

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