mirror of https://gitee.com/openkylin/libvirt.git
130 lines
5.4 KiB
XML
130 lines
5.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<body>
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<h1>Java API bindings</h1>
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<h2>Presentation</h2>
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<p>The Java bindings make use of <a href="https://jna.dev.java.net/">JNA</a>
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to expose the C API in a Java friendly way. The bindings are based on
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work initiated by Toth Istvan.</p>
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<h2>Getting it</h2>
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<p>
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The latest versions of the libvirt Java bindings can be downloaded from:
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</p>
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<ul>
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<li><a href="ftp://libvirt.org/libvirt/java/">libvirt.org FTP server</a></li>
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<li><a href="https://libvirt.org/sources/java/">libvirt.org HTTP server</a></li>
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</ul>
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<h3>Maven</h3>
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<p>A maven repository is located at <a href="https://libvirt.org/maven2/">https://libvirt.org/maven2/</a>
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which you can use to include this in your maven projects.</p>
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<h2>GIT source repository</h2>
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<p> The Java bindings code source is now maintained in a <a
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href="http://git-scm.com/">git</a> repository available on
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<a href="https://libvirt.org/git/">libvirt.org</a>:
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</p>
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<pre>
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git clone https://libvirt.org/git/libvirt-java.git
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</pre>
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<p>
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It can also be browsed at
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</p>
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<pre>
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<a href="https://libvirt.org/git/?p=libvirt-java.git;a=summary">https://libvirt.org/git/?p=libvirt-java.git;a=summary</a>
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</pre>
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<h2>Building</h2>
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<p>The code is built using ant, and assumes that you have the jna jar installed. Once you have downloaded
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the code you can build the code with</p>
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<pre>
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% cd libvirt-java
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% ant build
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</pre>
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<h2>Content</h2>
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<p>The bindings are articulated around a few
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classes in the <code>org/libvirt</code> package, notably the
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<code>Connect</code>, <code>Domain</code> and <code>Network</code>
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ones. Functions in the <a href="html/index.html">C API</a>
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taking <code>virConnectPtr</code>, <code>virDomainPtr</code> or
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<code>virNetworkPtr</code> as their first argument usually become
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methods for the classes, their name is just stripped from the
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virConnect or virDomain(Get) prefix and the first letter gets converted to
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lower case, for example the C functions:</p>
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<p>
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<code>int <a href="html/libvirt-libvirt-domain.html#virConnectNumOfDomains">virConnectNumOfDomains</a>
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(virConnectPtr conn);</code>
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</p>
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<p>
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<code>int <a href="html/libvirt-libvirt-domain.html#virDomainSetMaxMemory">virDomainSetMaxMemory</a>
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(virDomainPtr domain, unsigned long memory);</code>
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</p>
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<p>become</p>
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<p>
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<code>virConn.numOfDomains()</code>
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</p>
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<p>
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<code>virDomain.setMaxMemory(long memory)</code>
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</p>
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<p> There is of course some functions where the mapping is less direct
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and using extra classes to map complex arguments. The <a href="https://libvirt.org/sources/java/javadoc">Javadoc</a> is available online or as
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part of a separate libvirt-java-javadoc package.</p>
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<p>So let's look at a simple example inspired from the
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<code>test.java</code> test found in <code>src</code> in the source tree:</p>
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<pre>import <span style="color: #0071FF; background-color: #FFFFFF">org.libvirt.*</span>;
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public class minitest {
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public static void main(String[] args) {
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Connect conn=null;
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try{
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conn = new <span style="color: #0071FF; background-color: #FFFFFF">Connect</span>("test:///default", true);
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} catch (<span style="color: #0071FF; background-color: #FFFFFF">LibvirtException</span> e) {
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System.out.println("exception caught:"+e);
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System.out.println(e.getError());
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}
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try{
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<span style="color: #0071FF; background-color: #FFFFFF">Domain</span> testDomain=conn.<span style="color: #007F00; background-color: #FFFFFF">domainLookupByName</span>("test");
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System.out.println("Domain:" + testDomain.<span style="color: #E50073; background-color: #FFFFFF">getName</span>() + " id " +
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testDomain.<span style="color: #E50073; background-color: #FFFFFF">getID</span>() + " running " +
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testDomain.<span style="color: #E50073; background-color: #FFFFFF">getOSType</span>());
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} catch (<span style="color: #0071FF; background-color: #FFFFFF">LibvirtException</span> e) {
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System.out.println("exception caught:"+e);
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System.out.println(e.getError());
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}
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}
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}
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</pre>
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<p>There is not much to comment about it, it really is a straight mapping
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from the C API, the only points to notice are:</p>
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<ul>
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<li>the import of the modules in the <code><span style="color: #0071FF; background-color: #FFFFFF">org.libvirt</span></code> package</li>
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<li>getting a connection to the hypervisor, in that case using the
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readonly access to the default test hypervisor.</li>
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<li>getting an object representing the test domain using <span style="color: #007F00; background-color: #FFFFFF">lookupByName</span></li>
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<li>if the domain is not found a LibvirtError exception will be raised</li>
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<li>extracting and printing some information about the domain using
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various <span style="color: #E50073; background-color: #FFFFFF">methods</span>
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associated to the Domain class.</li>
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</ul>
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<h2>Maven</h2>
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<p>Up until version 0.4.7 the Java bindings were available from the central maven repository.</p>
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<p>If you want to use 0.4.8 or higher, please add the following repository to your pom.xml</p>
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<pre><repositories>
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<repository>
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<id>libvirt-org</id>
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<url>https://libvirt.org/maven2</url>
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</repository>
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</repositories></pre>
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</body>
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</html>
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