Java Servlets 注入spring bean

方法一：HttpRequestHandler

此方法要实现HttpServlet，我们不能直接实现HttpServlet接口，而去实现HttpRequestHandler接口：

package com.xx.controller;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import org.springframework.web.HttpRequestHandler;import com.googlecode.jsonrpc4j.JsonRpcServer;@Component("myServlet")public class MyServlet implements HttpRequestHandler {    @Autowired    private TestManagerImpl testManagerImpl;    @Override    public void handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        String requestURI = request.getRequestURI();        requestURI = requestURI.substring(requestURI.lastIndexOf("/") + 1);        JsonRpcServer server = testManagerImpl.getServer(requestURI);        server.handle(request, response);    }}

此类被spring托管，我们用@Component("myServlet")注解方法，属性

    @Autowired
    private TestManagerImpl testManagerImpl;

   是我们需要注入的对象。

我们还需要在web.xml中配置此伪servlet：

<servlet>    <display-name>myServlet</display-name>    <servlet-name>myServlet</servlet-name>    <servlet-class>        org.springframework.web.context.support.HttpRequestHandlerServlet    </servlet-class></servlet><servlet-mapping>    <servlet-name>myServlet</servlet-name>    <url-pattern>/myurl/*</url-pattern></servlet-mapping>

注意：servlet-class的配置类是：

      <servlet-class>
        org.springframework.web.context.support.HttpRequestHandlerServlet
    </servlet-class>

方法二：利用org.springframework.beans.factory.annotation.Configurable 注解与  SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this) 实现

package com.xxx.controller;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Configurable;import org.springframework.web.context.support.SpringBeanAutowiringSupport;import com.googlecode.jsonrpc4j.JsonRpcServer;@Configurablepublic class TestServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    @Autowired    private TestManagerImpl   testManagerImpl;    @Override    public void init() throws ServletException {        SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);    }    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        this.doPost(req, resp);    }    @Override    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        String requestURI = request.getRequestURI();        requestURI = requestURI.substring(requestURI.lastIndexOf("/") + 1);        JsonRpcServer server = testManagerImpl.getServer(requestURI);        server.handle(request, response);    }}

属性：

  @Autowired
    private TestManagerImpl   testManagerImpl;

必须是@Autowired注解，此属性是我们需要注入的对象。

 web.xml的配置如下：

  <servlet>        <servlet-name>TestServlet</servlet-name>        <servlet-class>com.xxx.controller.TestServlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>TestServlet</servlet-name>        <url-pattern>/TestServlet/*</url-pattern>    </servlet-mapping>

标准配置Servlet方式。

        还需一下配置spring xml：

         <context:component-scan base-package="com.xxx"/> 
<context:annotation-config/>
<context:spring-configured/>

效果图：