SpringMVC中的返回值问题之二返回数值类型和字符串类型

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我是靠谱客的博主美满大神，最近开发中收集的这篇文章主要介绍SpringMVC中的返回值问题之二返回数值类型和字符串类型，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

返回数值类型和字符串类型

需要导入依赖

当引入Jackson-databind-2.5.1.jar时自动引入Jackson-annotations-2.5.0.jar

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.1</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.1</version>
</dependency>

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
<display-name>Archetype Created Web Application</display-name>


<!--编码过滤器-->
 <filter>
<filter-name>CharactorEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharactorEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<!--配置前端控制器-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--初始化参数-->
 <init-param>
<param-name>contextConfigLocation</param-name>
 <param-value>classpath:springmvc07RetuenObject.xml</param-value>
 </init-param>

<!--意思:Tomact启动，就将servlet创建好放入内存中了-->
 <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

</web-app>

静态资源

<?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:mvc="http://www.springframework.org/schema/mvc"
 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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
 ">
<!--扫描包-->
 <context:component-scan base-package="cn.sjl.day04returnobject"></context:component-scan>

<!--访问静态资源-->
 <mvc:resources mapping="/js/**" location="/js/"></mvc:resources>
<!--注解驱动-->
 <mvc:annotation-driven/>
</beans>

//控制器
@Controller
public class FirstController {

/**
     * 返回数值类
 * @return
 */
 @RequestMapping(value = "/first") //控制器方法（即访问方法）
 @ResponseBody //响应体
 public Object doFirst(){
return 1;
 }


/**
 * 返回字符串类型
 * @return
 */
 @RequestMapping(value = "/second",produces = "text/html;charset=utf-8") //控制器方法（即访问方法）
 @ResponseBody //响应体
 public Object doSecond(){
return "你好";
 }

}

return.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>返回值数值</title>
</head>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.8.3.min.js"></script>
<script type="text/javascript">
$(function(){
$("#btn").click(function(){
$.ajax({
url:"${pageContext.request.contextPath}/first",

 /* url:"${pageContext.request.contextPath}/second",*/
success:function (data) {
alert(data)；
 }
 });
 });
 });

</script>
<body>
<input type="button" id="btn" value="Ajax"/>
</body>
</html>