注：geoserver 版本 Linux geoserver2.15.0    安装 ：bin方式安装(内嵌jetty，非war安装)

一。geoserver调优之Java图像处理优化

1.原生JAI和ImageIO

GeoServer的图像处理功能使用了Java的JAI和JAI ImageIO功能，但由于Java的JAI和JAI ImageIO库默认是Java实现，若将其换为原生库可显著提高图像处理速度。注意，在windows下只有32位Java环境才可用，64位Java环境不可用原生库。下载和拷贝原生库文件的操作参考以下代码：

cd /tmp

#解压

gunzip -c jai-1_1_3-lib-linux-amd64.tar.gz | tar xf -

gunzip -c jai_imageio-1_1-lib-linux-amd64.tar.gz | tar xf -

#把解压之后的相关文件拷贝到jre目录下(jdk安装目录)

#/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64   指jdk安装目录，查看jdk安装目录，参考：

https://www.cnblogs.com/luminccs-5308/p/10043338.html

cp /tmp/jai-1_1_3/lib/*.jar /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/ext/

cp /tmp/jai-1_1_3/lib/*.so /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/amd64/

cp /tmp/jai_imageio-1_1/lib/*.jar /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/ext/

cp /tmp/jai_imageio-1_1/lib/*.so /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/amd64/

2.重启geoserver报错        geoserver启动 Could not initialize class javax.media.jai.JAI

3.解决：删除$CATALINA_BASE/webapps/geoserver/WEB-INF/lib目录下的 jai_codec-1.1.3.jar; jai_core-1.1.3.jar; jai_imageio-1.1.jar 三个文件

注：先备份后删除

mkdir -p  /tmp/geoserver/

cp /usr/local/geoserver-2.15.0/webapps/geoserver/WEB-INF/lib/jai*.jar    /tmp/geoserver/

cd /usr/local/geoserver-2.15.0/webapps/geoserver/WEB-INF/lib

ls

ls jai*

rm -f -r jai_codec-1.1.3.jar

ls jai*

rm -f -r jai_core-1.1.3.jar

ls

ls jai*

rm -f -r jai_imageio-1.1.jar

ls jai*

4.重启geoserver

二。原生库变回java库

1.删除jre下的原生jar包(核对是否是自己之前复制过去的那些jar包)

rm -f -r /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/ext/jai_codec.jar

rm -f -r /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/ext/jai_core.jar

rm -f -r /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/ext/jai_imageio.jar

rm -f -r /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/ext/mlibwrapper_jai.jar

rm -f -r /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/ext/clibwrapper_jiio.jar

2.删除jre下的原生so文件(核对是否是自己之前复制过去的那些文件)

rm -f -r /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/amd64/libmlib_jai.so

rm -f -r /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/amd64/libclib_jiio.so

3.把之前删除的/webapps/geoserver/WEB-INF/lib目录下的 jai_codec-1.1.3.jar; jai_core-1.1.3.jar; jai_imageio-1.1.jar 三个文件还原

cp -r /tmp/geoserver/*.jar /usr/local/geoserver-2.15.0/webapps/geoserver/WEB-INF/lib/