Java找不到类

ryekayo 发表于 Dev

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我创建了一个清单文件：

Manifest-Version: 1.0
Main-Class: DICOMValidate.menu
Class-Path: lib/log4j-1.2.16.jar lib/sl4j-api-1.6.4jar lib/sl4j-log4j12-1.6.4.jar lib/dcm4che-audit-2.0.25.jar lib/dcm4che-core-2.0.25.jar lib/dcm4che-image-2.0.25.jar lib/dcm4che-imageio-2.0.25.jar lib/dcm4che-iod-2.0.25.jar lib/dcm4che-net-2.0.2h.jar

当我尝试在Windows命令提示符下的目录：中运行文件时C:\temp\workspace\DICOMVALIDATE>java -jar DICOMValidate.jar，出现以下错误：

   View DICOM tags
    Enter DICOM File Path Name:
    C:/Ryan.dcm
    Enter Tag list:
    C:/testing.txt
Exception in thread "main" java.lang.NoClassDefFoundError: org/dcm4che2/io/DicomInputStream
        at DicomValidator.viewDICOMTags.readDICOMObject(viewDICOMTags.java:40)
        at DicomValidator.menu.showMenu(menu.java:46)
        at DicomValidator.menu.main(menu.java:14)
Caused by: java.lang.ClassNotFoundException: org.dcm4che2.io.DicomInputStream
        at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
        ... 3 more

这应该在中访问DicomInputStream dcm4che-core-2.0.25.jar。我不知道为什么它不像我多次尝试的那样不能访问该类，并且仍然得到相同的结果（尽管我已经确保拼写正确并且一切都正确）。有人可以帮我找出为什么无法访问此.jar吗？

更新：我已经进行了所有建议的更改，但是仍然遇到相同的错误：

Please Enter:
1 to View DICOM Tags
2 to Add DICOM Tags
3 to Edit DICOM Tags
4 to exit
1
View DICOM tags
Enter DICOM File Path Name:
IM-0009-0001.dcm
Enter Tag list:
tags.txt
Exception in thread "main" java.lang.NoClassDefFoundError: org/dcm4che2/io/DicomInputStream
        at DicomValidator.viewDICOMTags.readDICOMObject(viewDICOMTags.java:40)
        at DicomValidator.menu.showMenu(menu.java:45)
        at DicomValidator.menu.main(menu.java:14)
Caused by: java.lang.ClassNotFoundException: org.dcm4che2.io.DicomInputStream
        at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
        ... 3 more

有人可以帮我弄清楚为什么它不能识别DicomInputStream吗？

奥利维尔·格雷戈尔（OlivierGrégoire）

MANIFEST.MF中存在几个问题。

首先，您有几个不正确的库名，如ctrueden所指出。

其次，您的MANIFEST.MF的行不得超过72个字节（请参阅ref）。

因此，总的来说，您的MANIFEST.MF应该为以下内容（在本地测试）：

Manifest-Version: 1.0
Main-Class: DICOMValidate.menu
Class-Path: lib/log4j-1.2.16.jar lib/slf4j-log4j12-1.6.4.jar lib/slf4j
 -api-1.6.4.jar lib/dcm4che-audit-2.0.25.jar lib/dcm4che-core-2.0.25.j
 ar lib/dcm4che-image-2.0.25.jar lib/dcm4che-imageio-2.0.25.jar lib/dc
 m4che-iod-2.0.25.jar lib/dcm4che-net-2.0.25.jar

最后，按照其他人的建议，您应该真正使用Maven。这是构建所需的jar时应使用的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>tmp</groupId>
    <artifactId>tmp2</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>
    <repositories>
        <repository>
            <id>dcm4che</id>
            <url>http://www.dcm4che.org/maven2/</url>
        </repository>
    </repositories>
    <dependencies>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.4</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.4</version>
        </dependency>
        <dependency>
            <groupId>dcm4che</groupId>
            <artifactId>dcm4che-audit</artifactId>
            <version>2.0.25</version>
        </dependency>
        <dependency>
            <groupId>dcm4che</groupId>
            <artifactId>dcm4che-core</artifactId>
            <version>2.0.25</version>
        </dependency>
        <dependency>
            <groupId>dcm4che</groupId>
            <artifactId>dcm4che-image</artifactId>
            <version>2.0.25</version>
        </dependency>
        <dependency>
            <groupId>dcm4che</groupId>
            <artifactId>dcm4che-imageio</artifactId>
            <version>2.0.25</version>
        </dependency>
        <dependency>
            <groupId>dcm4che</groupId>
            <artifactId>dcm4che-iod</artifactId>
            <version>2.0.25</version>
        </dependency>
        <dependency>
            <groupId>dcm4che</groupId>
            <artifactId>dcm4che-net</artifactId>
            <version>2.0.25</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <mainClass>DICOMValidate.menu</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>