1.创建JavaWeb项目并配置相关设置 links

2.在对应的Sources文件夹下面创建一个继承HttpServlet的服务类

public class HelloWorld extends HttpServlet {
    private String message;

    @Override
    public void init() throws ServletException {
        message = "{\"sessionId\":\"B93BC32DA5654ADE1D0CA165E3D1BE3E\",\"success\":true,\"listdata\":[{\"cl_time\":\"2018-06-28 09:57:38\",\"apprecord\":\"false\"}]}\n";
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //设置响应内容类型
        resp.setContentType("text/json");
        //设置逻辑实现
        PrintWriter out = resp.getWriter();
        out.println(message);
    }
}

3.配置web.xml

    <servlet>
        <!--别名-->
        <servlet-name>HelloWorld</servlet-name>
        <!--对应服务类的全名（含包名）-->
        <servlet-class>com.gxut.webdemo.service.HelloWorld</servlet-class>
    </servlet>
    <servlet-mapping>
        <!--对应servlet里面的别名-->
        <servlet-name>HelloWorld</servlet-name>
        <!--访问时候的网址 ：基础网址 + /HelloWorld-->
        <url-pattern>/HelloWorld</url-pattern>
    </servlet-mapping>