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Java 此URL不支持HTTP方法GET-不向控制台打印任何内容

java jsp servlets

Java 此URL不支持HTTP方法GET-不向控制台打印任何内容,java,jsp,servlets,httprequest,http-status-code-405,Java,Jsp,Servlets,Httprequest,Http Status Code 405,例如，我发现了一些类似的问题，但在这两个问题中，结果都在控制台中打印，而在我的例子中，什么都没有 问题是，我有一个JavaServlet子类，我想在浏览器屏幕上打印一些东西。但是，当我转到servlet映射到的url时，它会将以下内容打印到屏幕上： 这是我的Servlet子类： package instrurental_proj.servlets; import java.io.IOException; import java.io.PrintWriter; import javax.se

例如，我发现了一些类似的问题，但在这两个问题中，结果都在控制台中打印，而在我的例子中，什么都没有

问题是，我有一个JavaServlet子类，我想在浏览器屏幕上打印一些东西。但是，当我转到servlet映射到的url时，它会将以下内容打印到屏幕上：

这是我的Servlet子类：

package instrurental_proj.servlets;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Bla extends HttpServlet {

    private static final long serialVersionUID = 16252534;
    private static int ping = 3000;
    private Thread t;
    private static boolean shouldStop = false;

    @Override
    public void init() throws ServletException {

    }
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        System.out.println("doGet");
        PrintWriter out = resp.getWriter();
        out.println("<html><h1>It works!!</h1></html>");
    }

    @Override
    public void service(ServletRequest req, ServletResponse resp) throws ServletException, IOException {
        System.out.println("service");

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("doPost");
    }

    @Override
    public void destroy() {
        System.out.println("Destroy servlet");
        shouldStop = true;
    }
}
当我运行服务器时，控制台会打印出以下内容：

Aug 31, 2014 12:50:36 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\ActiveState Komodo Edit 8\;C:\Program Files (x86)\Haskell\bin;C:\Program Files (x86)\Haskell Platform\2013.2.0.0\lib\extralibs\bin;C:\Program Files (x86)\Haskell Platform\2013.2.0.0\bin;C:\Program Files (x86)\HP SimplePass\x64;C:\Program Files (x86)\HP SimplePass\;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files\Java\jdk1.7.0_25\bin;c:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files\Common Files\Autodesk Shared\;C:\Program Files (x86)\Autodesk\Backburner\;C:\Program Files (x86)\PostgreSQL\9.3\lib;C:\Program Files\SourceGear\Common\DiffMerge\;C:\Program Files (x86)\QuickTime\QTSystem;C:\Python27\;C:\Python27\Scripts;C:\Program Files (x86)\Haskell Platform\2013.2.0.0\mingw\bin;C:\Anaconda;C:\Anaconda\Scripts;C:\Program Files (x86)\Git\cmd;C:\Program Files (x86)\VisualSVN Server\bin;C:\wamp\bin\php\php5.4.12;C:\ProgramData\ComposerSetup\bin;C:\Program Files (x86)\Boundless\OpenGeo\bin;C:\Program Files (x86)\Boundless\OpenGeo\jetty\jre\bin;C:\Program Files\Java\jdk1.7.0_25;C:\Users\Imray\AppData\Roaming\cabal\bin;C:\Program Files (x86)\SSH Communications Security\SSH Secure Shell;C:\Program Files (x86)\Nmap;C:\Program Files (x86)\Google\google_appengine\;C:\Program Files (x86)\Apache Software Foundation\apache-maven-3.2.3\bin;.
Aug 31, 2014 12:50:36 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.j2ee.server:instrurental_proj' did not find a matching property.
Aug 31, 2014 12:50:36 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Aug 31, 2014 12:50:36 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Aug 31, 2014 12:50:36 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 465 ms
Aug 31, 2014 12:50:36 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Aug 31, 2014 12:50:36 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.54
Aug 31, 2014 12:50:36 PM org.apache.catalina.realm.JDBCRealm startInternal
SEVERE: Exception opening database connection
java.sql.SQLException: org.postgresql.Driver
    at org.apache.catalina.realm.JDBCRealm.open(JDBCRealm.java:692)
    at org.apache.catalina.realm.JDBCRealm.startInternal(JDBCRealm.java:780)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5350)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.postgresql.Driver
    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 java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at org.apache.catalina.realm.JDBCRealm.open(JDBCRealm.java:688)
    ... 11 more

Aug 31, 2014 12:50:38 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Aug 31, 2014 12:50:38 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Aug 31, 2014 12:50:38 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1617 ms
我的
web.xml
文件中似乎有错误。当我将
web.xml
文件的头从

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >
到

您在apache中没有org.postgresql.Driver

选择您的jdbc.jar

  • 将jdbc-version.jar添加到apache-tomcat-x.x.x\lib文件。

    您确定向我们展示了正确的配置和servlet吗？您发布的代码不能给出405。@SotiriosDelimanolis是的，100%确定……我看不到。打开您的容器日志并向我们展示它打印出来的内容。在哪里可以找到容器日志？你是说控制台吗？是的，我是说控制台。apache tomcat的日志位于安装目录下的
    /logs
    下。 
    <!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

    <?xml version="1.0" encoding="UTF-8" ?>