Spring MVC--自定义HttpMessageConverter接收JSON格式的数据

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a772304419 2021-07-06 16:31:37 ©著作权

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替换默认的Jackson，使用fastjson来处理json格式的数据。

index.jsp


<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>测试接收JSON格式的数据</title>
<script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>
<script type="text/javascript" src="js/json2.js"></script>
<script type="text/javascript">
$(document).ready(function(){
	testRequestBody();
});
function testRequestBody(){
	$.ajax("${pageContext.request.contextPath}/json/testRequestBody",// 发送请求的URL字符串。
			{
			dataType : "json", // 预期服务器返回的数据类型。
   			type : "post", //  请求方式 POST或GET
		   contentType:"application/json", //  发送信息至服务器时的内容编码类型
		   // 发送到服务器的数据。
		   data:JSON.stringify({id : 1, name : "水滸傳"}),
		   async:  true , // 默认设置下，所有请求均为异步请求。如果设置为false，则发送同步请求
		   // 请求成功后的回调函数。
		   success :function(data){
			   console.log(data);
			  $("#id").html(data.id);
			  $("#name").html(data.name);
			  $("#author").html(data.author);
		   },
		   // 请求出错时调用的函数
		   error:function(){
			   alert("数据发送失败");
		   }
	});
}
</script>
</head>
<body>
编号：<span id="id"></span><br>
书名：<span id="name"></span><br>
作者：<span id="author"></span><br>
</body>
</html>

BookController.java


package org.zhangxueliang.controller;

import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.zhangxueliang.domain.Book;

import com.alibaba.fastjson.JSONObject;

@Controller
@RequestMapping("/json")
public class BookController {
	
	private static final Log logger = LogFactory.getLog(BookController.class);
	
	// @RequestBody根据json数据，转换成对应的Object
    @RequestMapping(value="/testRequestBody")
    public void setJson(@RequestBody Book book,
    		HttpServletResponse response) throws Exception{
    	// JSONObject-lib包是一个beans,collections,maps,java arrays和xml和JSON互相转换的包。
    	// 使用JSONObject将book对象转换成json输出
    	logger.info(JSONObject.toJSONString(book));
    	book.setAuthor("施耐庵");
    	response.setContentType("text/html;charset=UTF-8");
    	// 将book对象转换成json写出到客户端
    	response.getWriter().println(JSONObject.toJSONString(book));
    }

}

Book.java

package org.zhangxueliang.domain;

import java.io.Serializable;

public class Book implements Serializable {

	private Integer id;
	private String name;
	private String author;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

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

	public String getAuthor() {
		return author;
	}

	public void setAuthor(String author) {
		this.author = author;
	}

	@Override
	public String toString() {
		return "Book [id=" + id + ", name=" + name + ", author=" + author + "]";
	}

}

springmvc-config.xml


<?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:util="http://www.springframework.org/schema/util"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd     
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.2.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util-4.2.xsd">
        
    <!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件，
    	如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean -->
    <context:component-scan base-package="org.zhangxueliang.controller"/>
	<!-- 使用默认的Servlet来响应静态文件 -->
    <mvc:default-servlet-handler/>
	<!-- 设置配置方案 -->
    <mvc:annotation-driven>
    	<!-- 设置不使用默认的消息转换器 -->
        <mvc:message-converters register-defaults="false">
        	<!-- 配置Spring的转换器 -->
        	<bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
    		<bean class="org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter"/>
    		<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
    		<bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter"/>
            <!-- 配置fastjson中实现HttpMessageConverter接口的转换器 -->
            <bean id="fastJsonHttpMessageConverter" 
            	class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                <!-- 加入支持的媒体类型：返回contentType -->
                <property name="supportedMediaTypes">
                    <list>
                        <!-- 这里顺序不能反，一定先写text/html,不然ie下会出现下载提示 -->
                        <value>text/html;charset=UTF-8</value>
                        <value>application/json;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>
    
    <!-- 视图解析器  -->
     <bean id="viewResolver"
          class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
        <!-- 前缀 -->
        <property name="prefix">
            <value>/WEB-INF/content/</value>
        </property>
        <!-- 后缀 -->
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>
    
</beans>

web.xml


<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
	http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
	id="WebApp_ID" version="3.1">
	<!-- 定义Spring MVC的前端控制器 -->
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>
        org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/springmvc-config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <!-- 让Spring MVC的前端控制器拦截所有请求 -->
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  
  <!-- 编码过滤器 -->
  <filter>
		<filter-name>characterEncodingFilter</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>
 </filter>
	<filter-mapping>
		<filter-name>characterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
</web-app>