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Spring如何在servlet中获取Bean

2011-01-05 13:42:23| 分类： IT | 标签： |举报 |字号大中小订阅

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有两种方法：

1）、先添加servlet的静态方法：

private static Object servletfindBean(ServletContext servletContext,
   String beanName) {
  ApplicationContext appctx = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
  return appctx.getBean(beanName);
}

在doGet()或doPost()方法使用如下：

ServletContext servletContext = request.getSession() .getServletContext();

DataBean OraDatabase = (DataBean) Myservlet.servletfindBean( servletContext, "dataBean");

注：Myservlet 是servlet的名字；DataBean 是实际spring中注册的bean；dataBean为spring中注册bean的id

2）、在init方法中添加：

private ApplicationContext appctx = null;//定义全局变量context

public void init(ServletConfig config) throws ServletException { super.init(config);
appctx = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
}

在doGet()或doPost()方法使用如下：

DataBean OraDatabase =(DataBean) appctx.getBean("dataBean");

注：Myservlet 是servlet的名字；DataBean 是实际spring中注册的bean；dataBean为spring中注册bean的id

当心：WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());

不要写成：WebApplicationContextUtils.getWebApplicationContext(getServletContext());

要不然会经常得到【空指针异常】

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