JaCoCo is a free Java code coverage library distributed under the Eclipse Public License. Check the project homepage for downloads, documentation and feedback.
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JaCoCo二次开发基于Git分支差分实现增量代码覆盖率
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原理：通过使用org.eclipse.jgit比较新旧分支代码差分，取得变更行信息，生成报告时高亮线上变更行信息，未检出变更行不做处理。从而达到，增量显示代码覆盖率的目的。当然当不传代码分支时默认展示全量覆盖率。
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使用方法：
1，懒伸手党模式：使用我二次开发后上传的Release包代替自己下载的Jacoco包。
测试代码以这个测试代码为例,假设daily为变更后要Release的代码，master分支为基线分支。测试的目的是想测试新开发的代码也即daily分支的代码是否全部已测试覆盖。我们测试时把daily下载后打包发布完成测试（在第一步Jacoco已经再Tomcat下配置好的情况下）。
package com.keking.report;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import org.jacoco.core.data.ExecutionDataWriter;
import org.jacoco.core.runtime.RemoteControlReader;
import org.jacoco.core.runtime.RemoteControlWriter;
public class ExecutionDataClient {
private static final String DESTFILE = "E:\\Git-pro\\JacocoTest\\jacoco.exec";//导出的文件路径
private static final String ADDRESS = "192.168.0.11";//配置的Jacoco的IP
private static final int PORT = 1024;//Jacoco监听的端口
/**
* Starts the execution data request.
*
* @param args
* @throws IOException
*/
public static void main(final String[] args) throws IOException {
final FileOutputStream localFile = new FileOutputStream(DESTFILE);
final ExecutionDataWriter localWriter = new ExecutionDataWriter(
localFile);
//连接Jacoco服务
final Socket socket = new Socket(InetAddress.getByName(ADDRESS), PORT);
final RemoteControlWriter writer = new RemoteControlWriter(socket.getOutputStream());
final RemoteControlReader reader = new RemoteControlReader(socket.getInputStream());
reader.setSessionInfoVisitor(localWriter);
reader.setExecutionDataVisitor(localWriter);
// 发送Dump命令，获取Exec数据
writer.visitDumpCommand(true, false);
if (!reader.read()) {
throw new IOException("Socket closed unexpectedly.");
}
socket.close();
localFile.close();
}
private ExecutionDataClient() {
}
}
这样就非常方便的不停服务的情况下，去导出exec文件了。
package com.keking.report;
import java.io.File;
import java.io.IOException;
import org.jacoco.core.analysis.Analyzer;
import org.jacoco.core.analysis.CoverageBuilder;
import org.jacoco.core.analysis.IBundleCoverage;
import org.jacoco.core.internal.diff.GitAdapter;
import org.jacoco.core.tools.ExecFileLoader;
import org.jacoco.report.DirectorySourceFileLocator;
import org.jacoco.report.FileMultiReportOutput;
import org.jacoco.report.IReportVisitor;
import org.jacoco.report.MultiSourceFileLocator;
import org.jacoco.report.html.HTMLFormatter;
/**
* This example creates a HTML report for eclipse like projects based on a
* single execution data store called jacoco.exec. The report contains no
* grouping information.
*
* The class files under test must be compiled with debug information, otherwise
* source highlighting will not work.
*/
public class ReportGenerator {
private final String title;
private final File executionDataFile;
private final File classesDirectory;
private final File sourceDirectory;
private final File reportDirectory;
private ExecFileLoader execFileLoader;
/**
* Create a new generator based for the given project.
*
* @param projectDirectory
*/
public ReportGenerator(final File projectDirectory) {
this.title = projectDirectory.getName();
this.executionDataFile = new File(projectDirectory, "jacoco.exec");//第一步生成的exec的文件
this.classesDirectory = new File(projectDirectory, "bin");//目录下必须包含源码编译过的class文件,用来统计覆盖率。所以这里用server打出的jar包地址即可,运行的jar或者Class目录
this.sourceDirectory = new File(projectDirectory, "src/main/java");//源码目录
this.reportDirectory = new File(projectDirectory, "coveragereport");////要保存报告的地址
}
/**
* Create the report.
*
* @throws IOException
*/
public void create() throws IOException {
// Read the jacoco.exec file. Multiple data files could be merged
// at this point
loadExecutionData();
// Run the structure analyzer on a single class folder to build up
// the coverage model. The process would be similar if your classes
// were in a jar file. Typically you would create a bundle for each
// class folder and each jar you want in your report. If you have
// more than one bundle you will need to add a grouping node to your
// report
final IBundleCoverage bundleCoverage = analyzeStructure();
createReport(bundleCoverage);
}
private void createReport(final IBundleCoverage bundleCoverage)
throws IOException {
// Create a concrete report visitor based on some supplied
// configuration. In this case we use the defaults
final HTMLFormatter htmlFormatter = new HTMLFormatter();
final IReportVisitor visitor = htmlFormatter.createVisitor(new FileMultiReportOutput(reportDirectory));
// Initialize the report with all of the execution and session
// information. At this point the report doesn't know about the
// structure of the report being created
visitor.visitInfo(execFileLoader.getSessionInfoStore().getInfos(),execFileLoader.getExecutionDataStore().getContents());
// Populate the report structure with the bundle coverage information.
// Call visitGroup if you need groups in your report.
visitor.visitBundle(bundleCoverage, new DirectorySourceFileLocator(sourceDirectory, "utf-8", 4));
// //多源码路径
// MultiSourceFileLocator sourceLocator = new MultiSourceFileLocator(4);
// sourceLocator.add( new DirectorySourceFileLocator(sourceDirectory1, "utf-8", 4));
// sourceLocator.add( new DirectorySourceFileLocator(sourceDirectory2, "utf-8", 4));
// sourceLocator.add( new DirectorySourceFileLocator(sourceDirectoryN, "utf-8", 4));
// visitor.visitBundle(bundleCoverage,sourceLocator);
// Signal end of structure information to allow report to write all
// information out
visitor.visitEnd();
}
private void loadExecutionData() throws IOException {
execFileLoader = new ExecFileLoader();
execFileLoader.load(executionDataFile);
}
private IBundleCoverage analyzeStructure() throws IOException {
//git登录授权
GitAdapter.setCredentialsProvider("QQ512433465", "mima512433465");
//全量覆盖
// final CoverageBuilder coverageBuilder = new CoverageBuilder();
//基于分支比较覆盖，参数1：本地仓库，参数2：开发分支（预发分支），参数3：基线分支(不传时默认为master)
//本地Git路径，新分支 第三个参数不传时默认比较maser，传参数为待比较的基线分支
final CoverageBuilder coverageBuilder = new CoverageBuilder("E:\\Git-pro\\JacocoTest","daily");
//基于Tag比较的覆盖 参数1：本地仓库，参数2：代码分支，参数3：新Tag(预发版本)，参数4：基线Tag（变更前的版本）
//final CoverageBuilder coverageBuilder = new CoverageBuilder("E:\\Git-pro\\JacocoTest","daily","v004","v003");
final Analyzer analyzer = new Analyzer(execFileLoader.getExecutionDataStore(), coverageBuilder);
analyzer.analyzeAll(classesDirectory);
return coverageBuilder.getBundle(title);
}
/**
* Starts the report generation process
*
* @param args
* Arguments to the application. This will be the location of the
* eclipse projects that will be used to generate reports for
* @throws IOException
*/
public static void main(final String[] args) throws IOException {
final ReportGenerator generator = new ReportGenerator(new File("E:\\Git-pro\\JacocoTest"));
generator.create();
}
}
执行完后就可以生成报告了。通过第一步，第二步结合，就可以随时导出Ecec文件，生成报告，查看测试覆盖情况了。那种需要启停服务的
通过率概览：
覆盖的代码显示为绿色
未覆盖的代码显示为红色
