return void ajax - 走看看

public class UserInfo {
    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

@Controller
public class json {
@RequestMapping("/tojson")
    public void write(HttpServletRequest request, HttpServletResponse response) throws IOException {
    List<UserInfo> list=new ArrayList<UserInfo>();
    UserInfo u1=new UserInfo();
    u1.setName("啊啊");
    u1.setAge(22);

    UserInfo u2=new UserInfo();
    u2.setName("哈哈");
    u2.setAge(20);

    list.add(u1);
    list.add(u2);


    String re= JSON.toJSONString(list);

    response.getWriter().write(re);



    }

}

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.12.4.js"></script>
<script type="text/javascript">
    $(function () {
        $.ajax({
            url:"${pageContext.request.contextPath}/tojson",
            type:"post",
            data:{},
            success:function (data) {
                alert(data);
            }

        });
    });



</script>
<body>
<h2>流氓</h2>
</body>
</html>