j2ee 获取上下文环境

j2ee 获取上下文环境

问题：1.不访问服务，如何获取上下文环境？

解答：1.通过在web里面配置servlet来解决。

1.1 web.xml

    <servlet>
        <servlet-name>GetContext</servlet-name>
        <servlet-class>com.ge.context.GetContext</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

1.2GetContext.java

package com.ge.context;

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.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

public class GetContext extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public GetContext() {
        super();
    }

    public void init() {
        WebApplicationContext context = WebApplicationContextUtils
                .getWebApplicationContext(this.getServletContext());
        ContextHolder.getInstance().setApplicationContext(context);
        ContextHolder.getInstance().setServletContext(this.getServletContext());
    };

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        init();
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        init();
    }
}

1.3ContextHolder.java

package com.ge.context;

import javax.servlet.ServletContext;

import org.springframework.context.ApplicationContext;

public class ContextHolder {
    private final static ContextHolder instance = new ContextHolder();
    private ApplicationContext ac;
    // added by cobble.ge 20130415
    private ServletContext servletContext;

    private ContextHolder() {
    }

    public static ContextHolder getInstance() {
        return instance;
    }

    public synchronized void setApplicationContext(ApplicationContext ac) {
        this.ac = ac;
    }

    public ApplicationContext getApplicationContext() {
        return ac;
    }

    public ServletContext getServletContext() {
        return servletContext;
    }

    public synchronized void setServletContext(ServletContext servletContext) {
        this.servletContext = servletContext;
    }
}

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@cobble HF.AH.CHN 2013-04-18

资料1：互联网，忘了从哪位仁兄的文章看的了。