思路：把servlet配置为spring的bean，就可以实现其他bean的注入，然后使用代理servlet来辅助配置和运行：
一、代理servlet的写法：
view sourceprint 01 import javax.servlet.ServletException;
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03 import javax.servlet.http.HttpServlet;
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05 import javax.servlet.http.HttpServletRequest;
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07 import javax.servlet.http.HttpServletResponse;
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09
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11 import org.apache.commons.logging.Log;
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13 import org.apache.commons.logging.LogFactory;
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15 import org.springframework.web.context.WebApplicationContext;
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17 import org.springframework.web.context.support.WebApplicationContextUtils;
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19
20
21 /**
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23 * HttpServlet 代理
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25 * @author lwei
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27 * @since 2011-03-17
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29 * @version 1.0
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31 */
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33 public class HttpServletProxy extends HttpServlet {
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35 /**
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37 * random serialVersionUID
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39 */
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41 private static final long serialVersionUID = -7208519469035631940L;
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43 Log logger = LogFactory.getLog(HttpServletProxy.class);
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45 private String targetServlet;
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47 private HttpServlet proxy;
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49
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51 public void init() throws ServletException {
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53 this.targetServlet = getInitParameter("targetServlet");
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55 getServletBean();
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57 proxy.init(getServletConfig());
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59 logger.info(targetServlet + " was inited by HttpServletProxy successfully......");
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61 }
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63
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65 private void getServletBean() {
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67 WebApplicationContext wac =
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69 WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
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71 this.proxy = (HttpServlet) wac.getBean(targetServlet);
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73 }
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75
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77 @Override
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79 public void service(HttpServletRequest request, HttpServletResponse response)
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81 throws ServletException, IOException, RuntimeException {
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83 proxy.service(request, response);
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85 }
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87 }
二、业务servlet的写法：
view sourceprint 01 import java.io.IOException;
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03
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05 import javax.servlet.ServletException;
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07 import javax.servlet.ServletOutputStream;
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09 import javax.servlet.http.HttpServlet;
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11 import javax.servlet.http.HttpServletRequest;
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13 import javax.servlet.http.HttpServletResponse;
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15
16
17 /**
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19 * @author lwei
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21 */
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23 public class UserCheckServlet extends HttpServlet {
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25
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27 /**
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29 * random serialVersionUID
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31 */
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33 private static final long serialVersionUID = 3075635113536622929L;
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35
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37 private UserService userService;(UserService 是spring托管的bean，通过set方法注入)
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39
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41 //如果直接配置在spring配置文件中，则set方法不是必须的。
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43 //具体怎么注入bean，看个人使用spring的习惯了
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45 public void setUserService (UserService userService) {
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47 this.userService = userService;
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49 }
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51
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53 public UserCheckServlet() {
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55 super();
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57 }
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59
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61 publ