谷歌开源！用 js 编写 Shell 脚本！ | 开源日报 No.247

response响应

• response 响应
• 页面index.jsp
• RedirectServlet
• Two
• 测试

response 响应

响应：(信息写回至浏览器)
作用：往浏览器写信息
组成部分：响应行 响应头 响应体
操作响应行

操作响应头：

操作响应体：

页面index.jsp

<%--  <%=request.getContextPath()%> 当前项目的路径--%>
  <a href="<%=request.getContextPath()%>/redirectServlet">servlet的重定向</a>

RedirectServlet

//使用注解配置浏览器资源路径
@WebServlet("/redirectServlet")
public class RedirectServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
		//重定向，如果注释下一行，则跳转第一个界面
        response.sendRedirect(request.getContextPath()+"/two.jsp");
        //自动跳转到two页面，以下不显示
        response.getWriter().append("第一个界面");
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}

Two

@WebServlet(value = "/two")
public class Two extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        response.getWriter().append("第二个界面：重定向");

        SimpleDateFormat sdf = new SimpleDateFormat();// 格式化时间
        sdf.applyPattern("yyyy-MM-dd HH:mm:ss a");// a为am/pm的标记
        Date date = new Date();// 获取当前时间
        //System.out.println("现在时间：" + sdf.format(date)); // 输出已经格式化的现在时间（24小时制）
        response.setHeader("date", sdf.format(date));
        response.getWriter().append("时间回显：" + sdf.format(date));
    }


    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}

测试

如果不使用注解配置资源路径，就要配置web.xml

    <servlet>
        <servlet-name>RedirectServlet</servlet-name>
        <servlet-class>com.controller.RedirectServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>RedirectServlet</servlet-name>
        <url-pattern>/redirectServlet</url-pattern>
    </servlet-mapping>
        <servlet>
        <servlet-name>Two</servlet-name>
        <servlet-class>com.lx.controller.Two</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Two</servlet-name>
        <url-pattern>/tow</url-pattern>
    </servlet-mapping>