Java框架之SpringMVC返回json串

最新推荐文章于 2025-03-10 10:35:23 发布

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最新推荐文章于 2025-03-10 10:35:23 发布

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分类专栏： JAVA 文章标签： spring mvc 框架 json

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使用注解@ResponseBody
需要导入Jackson2相关jar包：

这里写图片描述

接下来要在springmvc.xml配置相关转化解析类:


<!-- 避免IE执行AJAX时,返回JSON出现下载文件 -->
    <bean id="mappingJacksonHttpMessageConverter"
        class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>text/html;charset=UTF-8</value>
            </list>
        </property>
    </bean>
    <!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <!-- json转换器 -->
                <ref bean="mappingJacksonHttpMessageConverter" />
            </list>
        </property>
    </bean>

写个例子index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>首页</title>
</head>
<body>
    <li><a class="btn">点击</a></li>

</body>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript">
$(".btn").click(function(){
    $.ajax({
        type:"post",
        dataType:"json",
        url:"book/check.do",
        success:function(data){
        alert(data.author);//弹出"张华"
        }
    });
    })
</script>

</html>

然后在控制器BookController.java中

@Controller
@RequestMapping("book")
public class BookController {
    @Autowired
    private  BookService book;//此处不能写成static,否则下面第21行会出现空指针异常
    @RequestMapping("check.do")
    @ResponseBody
    public BookInfo check(){
    ApplicationContext sc=new ClassPathXmlApplicationContext("application.xml");
BookInfo bookInfo = (BookInfo)sc.getBean("book");
bookinfo.setAuthor("张华");
return bookinfo;
    }

}