本來想用InstallAnyWhere來製作一個安裝文件,裏面包含一個tomcat,結果發現InstallAnyWhere一時半會兒可能學不下來。我的目的是想用Java SWT做一個殼子,內嵌一個瀏覽器,這個瀏覽器訪問tomcat應用,讓整個程序看起來像是一個CS架構的。我需要的功能倒是不復雜,想想能不能自己實現一個tomcat。Tomcat有沒有提供這樣的功能呢,不小心搜索了一下“嵌入式Tomcat”,還真有,並且在Tomcat5的時候就已經支持了:https://devcenter.heroku.com/articles/create-a-java-web-application-using-embedded-tomcat#create-your-pom-xml
他用的maven,直接到官網上下載embed版的壓縮包下來解壓放到自己項目的lib目錄中,並添加到buildpath中。
按這上面的說法抄一個吧,代碼很簡單:
public class Main {
public static void main(String[] args) throws Exception {
String webappDirLocation = "src/main/webapp/";
Tomcat tomcat = new Tomcat();
//The port that we should run on can be set into an environment variable
//Look for that variable and default to 8080 if it isn't there.
String webPort = System.getenv("PORT");
if(webPort == null || webPort.isEmpty()) {
webPort = "8080";
}
tomcat.setPort(Integer.valueOf(webPort));
tomcat.addWebapp("/", new File(webappDirLocation).getAbsolutePath());
System.out.println("configuring app with basedir: " + new File("./" + webappDirLocation).getAbsolutePath());
tomcat.start();
tomcat.getServer().await();
}
}
按照該文章的步驟完全可以得出正確結果,但是他的方法生成了一個很複雜的bat文件,搞半天不還是搞出了一個和tomcat一模一樣的東西來。但是如果直接run這個main方法,會報下面的錯誤:
org.apache.jasper.JasperException: java.lang.IllegalStateException: No Java compiler available
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:585)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:391)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
追蹤源碼,發現是在load類org.apache.jasper.compiler.JDTCompiler的時候出了問題。但是這個類確實已經存在於編譯路徑中了,咋整?直接在main方法中在啓動tomcat之前load一把試試:
Class.forName("org.apache.jasper.compiler.JDTCompiler");
結果:
Caused by: java.lang.ClassNotFoundException: org.eclipse.jdt.internal.compiler.env.INameEnvironment
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 3 more
發現,其實是沒有上面的這個類。從網上找到,並加入到編譯路徑下就ok了:
接下來,把webapp換成真實項目的路徑,該項目中使用了spring、Hibernate等工具:
public class Main {
public static void main(String[] args) throws Exception {
String webappDirLocation = "src/main/webapp/";
Tomcat tomcat = new Tomcat();
//The port that we should run on can be set into an environment variable
//Look for that variable and default to 8080 if it isn't there.
String webPort = System.getenv("PORT");
if(webPort == null || webPort.isEmpty()) {
webPort = "8080";
}
tomcat.setPort(Integer.valueOf(webPort));
// tomcat.addWebapp("/", new File(webappDirLocation).getAbsolutePath());
tomcat.addWebapp("/nea", "D:\\apache-tomcat-7.0.34\\webapps\\nea");
System.out.println("configuring app with basedir: D:\\apache-tomcat-7.0.34\\webapps\\nea");
tomcat.start();
tomcat.getServer().await();
}
}
重新啓動,發現spring mvc 的路徑映射、Hibernate數據庫初始化等動作正常執行了。