在jar包中定位资源

时间:2010-10-12 14:27:34

标签: java resources jar

我有一个静态类,在类中,图像被加载到BufferedImage对象中,如下所示:

File groundTopImageFile = new File("src/main/resources/ground - grass top.png");

现在,当我使用Maven2创建一个可执行jar时,一切正常,但它找不到图像文件。我检查了jar,图像文件都放在jar的根目录中,所以我尝试使用:

File groundTopImageFile = new File("ground - grass top.png");

但没有成功。同样,我不能再在Eclipse中使用相同的代码了。有没有办法在jar和Eclipse中使这个工作?

这是我的Pom.xml文件:

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.WetWindmill</groupId>
  <artifactId>Sheepness</artifactId>
  <name>Sheepness</name>
  <version>0.0.1-SNAPSHOT</version>
  <description>Equilibrium reaction visualized with sheep :)</description>

  <dependencies>
    <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.4</version>
    <scope>test</scope>
  </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.5.8</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.6</source>
          <target>1.6</target>
        </configuration>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <executions>
          <execution>
            <id>unpack-dependencies</id>
            <phase>generate-resources</phase>
            <goals>
              <goal>unpack-dependencies</goal>
            </goals>
          </execution>
        </executions>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <configuration>
          <archive>
            <manifest>
              <mainClass>controller.Sheepness</mainClass>
              <packageName>com.WetWindmill.Sheepness</packageName>
            </manifest>
            <manifestEntries>
              <mode>under development</mode>
              <url>www.WetWindmill.com/Projects/Sheepness/</url>
            </manifestEntries>
          </archive>
        </configuration>
      </plugin>
    </plugins>

    <resources>
      <resource>
        <directory>${basedir}/target/dependency</directory>
      </resource>
      <resource>
        <directory>${basedir}/src/main/resources</directory>
      </resource>
    </resources>
  </build>
</project>

5 个答案:

答案 0 :(得分:7)

使用ImageIO.read(inputStream)并使用InputStream阅读ClassLoader.getResourceAsStream()

示例代码:

String resourceName = "my/picfolder/mypic.jpg";
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream stream = classLoader.getResourceAsStream(resourceName);
BufferedImage bi = ImageIO.read(stream);

注意:

在我的代码示例中,my/picfoldersrc/main/resources下面的相对文件夹层次结构

答案 1 :(得分:1)

URL imgURL = getClass().getResource("/ground - grass top.png");
if (imgURL != null)
{
  return new ImageIcon(imgURL, "Ground Grass Top");
}
else
{
  logger.error("Couldn't find file: " + "ground - grass top.png");
  return null;
}

答案 2 :(得分:0)

使用类加载器getResourceAsStream()方法。

答案 3 :(得分:0)

不使用“/./resources/back_img.png”,而是在ClassLoader中使用“resources / back_img.png”。 这是一个例子:

    String path = "resources/back_img.png";
    ClassLoader cl = ImageHandler.class.getClassLoader();
    URL imgURL = cl.getResource(path);
    //URL imgURL = ImageHandler.class.getResource(path);

    if (imgURL != null) {
        ImageIcon icon = new ImageIcon(imgURL, description);
        Image img = icon.getImage();
        Image sizedImg = img.getScaledInstance(width, height, Image.SCALE_DEFAULT);
        return new ImageIcon(sizedImg);
    } else {
        System.err.println("Couldn't find file: " + path);
        return null;
    }

答案 4 :(得分:0)

你解决了我的问题,肖恩帕特里克弗洛伊德。谢谢 它在IDE之间似乎有所不同,但是,看到jar文件的结构,我们知道相对路径是什么。 就我而言,我使用Netbean,我的文件放在 src / my / picfolder / mypic.jpg (它与肖恩的src / main / resources / my / picfolder / mypic.jpg ),但是当构建时,提取jar文件我们将在 my / picfolder / mypic.jpg 中看到图像。所以当我们调用 getResourceAsStream

时,相对路径必须是 my / picfolder / mypic.jpg