Springmvc完成ajax功能

Posted 2022-09-29 zfyyfw

 

　　1.加入jackson的jar包

　　2.在响应的方法上加上@ResponseBody：把java对象转化为json对象

　　3.方法的返回值可以是对象集合字符串

 

<script type="text/javascript" src="js/jquery-3.4.1.min.js"></script>
<script type="text/javascript">
    $.post("ajax/Ajax1","name":"zhu",function(data)
        $.each(data,function(i,n)
        alert(n.name);
            
        )    
    )
</script>

　　可以返回字符串

@RequestMapping(value="Ajax1",produces = "text/html;charset=UTF-8") 
    @ResponseBody
    public String ajax1(String name) 
        System.out.println(name);
        return "hello胡";
    

　　也可以返回对象

@RequestMapping("Ajax2")
    @ResponseBody
    public User ajax2(String name) 
        User user=new User("胡昊中","1");
        return user;
    

　　还可以返回集合

@RequestMapping("Ajax3")
    @ResponseBody
    public List<User> ajax3(String name) 
        User user1=new User("胡昊中","1");
        User user2=new User("朱华龙","2");
        User user3=new User("王玉峰","3");
        List<User> list=new ArrayList<>();
        list.add(user1);
        list.add(user2);
        list.add(user3);
        return list;
    

 

　　在返回字符串时，如果输入汉字会出现乱码，解决方法如下

1. 更改@RequestMapping

@RequestMapping(value="Ajax1",produces="text/html;charset=UTF-8")

2.  在springMVC配置文件中通过org.springframework.web.servlet.view.InternalResourceViewResolver类重写代码编码。

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.StringHttpMessageConverter">
             <constructor-arg index="0" value="utf-8"></constructor-arg>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>