效果图

jsp代码

<form >
            姓名：<input name="name" type="text"/>
            年龄：<input name="age" type="text"/>
            <input type="button" class="get" value="get提交"/>
            <input type="button"  class="post" value="post提交"/>
            <input type="button" class="ajax" value="ajax提交"/>
            </form>
            <div id="box"></div>

servlet代码

//get
public void doGet(HttpServletRequest request,HttpServletResponse response)
            throws ServletException,IOException {

        response.setContentType("text/html");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        String name = request.getParameter("name");
        String age = request.getParameter("age");
        if (name == null || name == "") {
            name = "测试名字admin";
        }

        if (age == null || age == "") {
            age = "测试年龄100";
        }
        user user = new user(1,name,age);
        PrintWriter out = response.getWriter();

        JSONObject jsonObj = JSONObject.fromObject(user);

        out.print(jsonObj);

        out.flush();
        out.close();
    }

//post
public void doPost(HttpServletRequest request,IOException {

        // response.setContentType("text/html");

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        String name = request.getParameter("name");
        if (name == null || name == "") {
            name = "测试名字admin";
        }
        String age = request.getParameter("age");
        if (age == null || age == "") {
            age = "测试年龄100";
        }
        user user = new user(1,age);
        PrintWriter out = response.getWriter();

        JSONObject jsonObj = JSONObject.fromObject(user);

        out.print(jsonObj);

        out.flush();
        out.close();
    }

JS核心代码

<script type="text/javascript"> //get $(document).ready(function() { $('form .get').click(function() { $.get('ajaxServlet',function(response,status,xhr){ var dataObj = eval("(" + response + ")"); $("#box").html(response); alert(dataObj.name); }); }); //post $('form .post').click(function() { $.post('ajaxServlet',xhr){ var dataObj = eval("(" + response + ")"); $("#box").html(response); }); }); //ajax $('form .ajax').click(function() { alert($("[name='name']").val()); $.ajax({ type:'get',url:'ajaxServlet',data:{ name:$("[name='name']").val(),age:$("[name='age']").val() },success:function(response,xhr){ $("#box").html(response);} }); }); }); </script>