Servlet示例项目

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页面部分或js

$.ajax({    type: "POST",    url: _contextPath + "/getAllInfo",    dataType: "json",    success: function() {}});

web.xml 修改

<servlet>        <servlet-name>getAllInfo</servlet-name>        <servlet-class>GetAllInfo</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>getAllInfo</servlet-name>        <url-pattern>/getAllInfo1</url-pattern>    </servlet-mapping>

后台部分

import javax.servlet.http.HttpServlet;public class GetAllInfo extends HttpServlet {    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp)         throws ServletException, IOException {        doPost(req, resp);    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp )        throws ServletException, IOException {            List<Map<String, Object>> allInfo = bo.getAllInfo();            JSONArray jsonA = JSONArray.fromObject(allInfo);            PrintWriter out = resp.getWriter();            out.println(jsonA);            out.flush();            out.close();        }}

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