springmvc中ajax的处理

1、使用HttpServletResponse来处理-不需要配置解析器　

@Controller
public class AjaxController {
    
    @RequestMapping("/ajax")
    public void ajax(String name,HttpServletResponse resp) throws IOException{
        if("siggy".equals(name)) {
            resp.getWriter().print(true);
        }else {
            resp.getWriter().print(false);
        }
    }

}

　jsp页面中引入Jquery

用户名：<input type="text" id="txtName" />  

<script type="text/javascript">
    $(function () {
        $("#txtName").blur(function(){
            $.post("ajax.do",{'name':$("#txtName").val()},function(data){
                alert(data);
            });
        });
    });

</script>

2、springmvc处理json数据

首先导入jar包。

之后在mvc.xml文件中配置json解析器，整个mvc.xml配置代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="org.springframework.samples.petclinic.web"/>

 <!-- 配置渲染器 -->
 
<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <!-- 结果视图的前缀 -->
    <property name="prefix" value="/WEB-INF/jsp/"/>
    <!-- 结果视图的后缀 -->
    <property name="suffix" value=".jsp"/>
</bean>

<!-- json解析 -->
<!-- 用于将对象转换为JSON -->
<bean id="stringConverter" class="org.springframework.http.converter.StringHttpMessageConverter">
    <property name="supportedMediaTypes">
        <list>
        <value>text/plain;charset=UTF-8</value>
        </list>
    </property>
</bean>
<bean id="jsonConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
        <ref bean="stringConverter" />
        <ref bean="jsonConverter" />
        </list>
    </property>
</bean>

<!-- 扫描该包下的注解 -->
<context:component-scan base-package="com.controller"></context:component-scan>

</beans>

　　编写Controller

@Controller
public class JsonController {
    
    @RequestMapping("/json")
    @ResponseBody
    public List<User> json(){
        List<User> list = new ArrayList<User>();
        list.add(new User(1,"张三","男"));
        list.add(new User(2,"ang","女"));
        list.add(new User(3,"历史","男"));
        return list;
    }
    
}

　　编写jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>json</title>
</head>
<body>
<script type="text/javascript" src="js/jquery-3.5.1.js"></script>
<script type="text/javascript">
$(function(){
    $("#btn").click(function(){
        $.post("json.do",function(data){
            var html="";
            for(var i=0;i<data.length;i++){
                    html+="<tr><td>"+data[i].id+"</td><td>"+data[i].username+"</td><td>"+data[i].pwd+"</td></tr>";
                     
            }
            $('#content').html(html);
        });
    });
});


</script> 
<input id="btn" value="获取数据" type="button" />
<table width="80%" align="center">
    <tr>
    <td>编号</td>
    <td>姓名</td>
    <td>性别</td>
    </tr>

<tbody id="content">
</tbody>

</table>
</body>
</html>

　　结果如下图

index.jsp放在WebContent根目录下。