什么是Jacoco？
Jacoco(java code coverage)是一个开源的Java代码覆盖率工具，Jacoco可以嵌入到Ant 、Maven中，并提供了EclEmma Eclipse插件,也可以使用JavaAgent技术监控Java程序。很多第三方的工具提供了对Jacoco的集成，如sonar、Jenkins等。
软件安装
Ant
Jacoco
Tomcat配置
1、进入你需要统计代码覆盖率的tomcat
cd /data/tomcat-gateway/bin
2、先关闭这个tomcat的服务
正常情况下可以直接执行 ./shutdown.sh
执行结束后 ps -ef|grep tomcat名 查看是否已经正常关闭，如果还没有关闭 kill -9 pid(来源于ps的结果)
3、修改 catalina.sh 的JAVA_OPTS/CATALINA_OPTS配置
output=file时，需要shudown服务才能dump出jacoco.exec文件
declare -x CATALINA_OPTS="-javaagent:/data/jacoco/lib/jacocoagent.jar=includes=*,output=file,destfile=/data/jacocoExec/jacoco_gateway.exec"
output=file时，需要shudown服务才能dump出jacoco.exec文件
declare -x CATALINA_OPTS="-javaagent:/data/jacoco/lib/jacocoagent.jar=includes=*,output=file,destfile=/data/jacocoExec/jacoco_gateway.exec"
output=tcpserver时，可以利用ant执行dump操作，无需shutdown服务；
address可以填写hostname或ip，填ip时需要注意，查看/etc/hosts的hostname映射的ip是什么
address可以填写hostname或ip，填ip时需要注意，查看/etc/hosts的hostname映射的ip是什么
declare -x CATALINA_OPTS="-javaagent:/data/jacoco/lib/jacocoagent.jar=includes=*,output=tcpserver,port=8457,address=172.16.1.31"
具体参数的意思请查看官方文档
4、启动服务 ./startup.sh
5、查看一下JAVA_OPTS是否有修改正确，在这有个坑，有一种情况是你把JAVA_OPTS写在前面，在后面被别人的覆盖了
ps -ef|grep tomcat名 看出来的结果有没有刚才你修改的值
6、output=tcpserver时，查看tcpserver有没有启来
netstat -tunlp|grep 8457
Spring Boot服务
启动命令如下：
java -javaagent:/data/jacoco/lib/jacocoagent.jar=includes=*,output=tcpserver,port=8457,address=172.16.1.31 -jar springboot-xxx.jar
ant任务配置
配置jacocoAnt.xml文件
xml version="1.0" encoding="UTF-8"?>
<project name="JaCoCo" default="run" xmlns:jacoco="antlib:org.jacoco.ant">
<property name="jacocoAntPath" value="/opt/jacoco/lib/jacocoant.jar"/>
<property name="jacocoExecPath" value="/data/jacocoExec"/>
<property name="jacocoReportPath" value="/data/jacocoReport"/>
<property name="server_ip_test163" value="172.16.1.31"/>
<property name="server_port_cybs" value="8456"/>
<property name="server_port_gateway" value="8457"/>
<property name="gatewaySrcPath" value="/data/jacocoSrc/Gateway/GATEWAY/fi-website/src/main/java"/>
<property name="cybsSrcPath" value="/data/jacocoSrc/cybs/src/main/java"/>
<property name="gatewayClassesPath" value="/data/jacocoClasses/gateway/WEB-INF/classes"/>
<property name="cybsClassesPath" value="/data/jacocoClasses/cybs/WEB-INF/classes"/>
<taskdef uri="antlib:org.jacoco.ant" resource="org/jacoco/ant/antlib.xml">
<classpath path="${jacocoAntPath}"/>
taskdef>
<target name="run">
<echo message="start..."/>
<echo message="dump..."/>
<antcall target="dump"/>
<echo message="merge..."/>
<antcall target="merge"/>
<echo message="report..."/>
<antcall target="report"/>
<echo message="end..."/>
target>
<target name="dump">
<jacoco:dump address="${server_ip_test163}" reset="true" destfile="${jacocoExecPath}/jacoco_gateway.exec" port="${server_port_gateway}" append="false"/>
<jacoco:dump address="${server_ip_test163}" reset="true" destfile="${jacocoExecPath}/jacoco_cybs.exec" port="${server_port_cybs}" append="false"/>
target>
<target name="merge">
<jacoco:merge destfile="${jacocoExecPath}/merged.exec">
<fileset dir="${jacocoExecPath}" includes="*.exec"/>
jacoco:merge>
target>
<target name="report">
<jacoco:report>
<executiondata>
<file file="${jacocoExecPath}/merged.exec"/>
executiondata>
<structure name="JaCoCo Report">
<group name="gateway coverage">
<sourcefiles encoding="UTF-8">
<fileset dir="${gatewaySrcPath}"/>
sourcefiles>
<classfiles>
<fileset dir="${gatewayClassesPath}"/>
classfiles>
group>
<group name="cybs coverage">
<sourcefiles encoding="UTF-8">
<fileset dir="${cybsSrcPath}"/>
sourcefiles>
<classfiles>
<fileset dir="${cybsClassesPath}"/>
classfiles>
group>
structure>
<html destdir="${jacocoReportPath}" encoding="utf-8"/>
<csv destfile="${jacocoReportPath}/report.csv"/>
<xml destfile="${jacocoReportPath}/report.xml"/>
jacoco:report>
target>
project>
执行ant任务
ant -f jacocoAnt.xml
reset=true时，会在dump出exec文件后，清空覆盖率数据；
append=false时，dump出的exec文件会覆盖原有的exec文件；append=true时，dump出的exec文件追加至原有的exec文件；
结果展示：
+ cd /data/jacocoAntXml
+ ant -f jacocoAnt.xml
Buildfile: /data/jacocoAntXml/jacocoAnt.xml
run:
[echo] start...
[echo] dump...
dump:
[jacoco:dump] Connecting to /172.16.1.15:8457
[jacoco:dump] Dumping execution data to /data/jacocoExec/jacoco_gateway.exec
[jacoco:dump] Connecting to /172.16.1.15:8456
[jacoco:dump] Dumping execution data to /data/jacocoExec/jacoco_cybs.exec
[jacoco:dump] Connecting to /172.16.1.15:8470
[jacoco:dump] Dumping execution data to /data/jacocoExec/jacoco_creditCardBank.exec
[jacoco:dump] Connecting to /172.16.1.15:8459
[jacoco:dump] Dumping execution data to /data/jacocoExec/jacoco_mps.exec
[jacoco:dump] Connecting to /172.16.1.15:8451
[jacoco:dump] Dumping execution data to /data/jacocoExec/jacoco_accounting.exec
[jacoco:dump] Connecting to /172.16.1.15:8458
[jacoco:dump] Dumping execution data to /data/jacocoExec/jacoco_ordercenter.exec
[jacoco:dump] Connecting to /172.16.1.15:8453
[jacoco:dump] Dumping execution data to /data/jacocoExec/jacoco_notification.exec
[jacoco:dump] Connecting to /172.16.1.15:8454
[jacoco:dump] Dumping execution data to /data/jacocoExec/jacoco_poss.exec
[echo] merge...
merge:
[jacoco:merge] Loading execution data file /data/jacocoExec/jacoco_accounting.exec
[jacoco:merge] Loading execution data file /data/jacocoExec/jacoco_creditCardBank.exec
[jacoco:merge] Loading execution data file /data/jacocoExec/jacoco_cybs.exec
[jacoco:merge] Loading execution data file /data/jacocoExec/jacoco_gateway.exec
[jacoco:merge] Loading execution data file /data/jacocoExec/jacoco_mps.exec
[jacoco:merge] Loading execution data file /data/jacocoExec/jacoco_notification.exec
[jacoco:merge] Loading execution data file /data/jacocoExec/jacoco_ordercenter.exec
[jacoco:merge] Loading execution data file /data/jacocoExec/jacoco_poss.exec
[jacoco:merge] Loading execution data file /data/jacocoExec/merged.exec
[jacoco:merge] Writing merged execution data to /data/jacocoExec/merged.exec
[echo] report...
report:
[jacoco:report] Loading execution data file /data/jacocoExec/merged.exec
[jacoco:report] Writing bundle 'webgate coverage' with 701 classes
[jacoco:report] Writing bundle 'gateway coverage' with 198 classes
[echo] end...
BUILD SUCCESSFUL
