使用fastjson與SpringMVC實現自定義HttpMessageConverter接收和獲取JSON格式的資料
阿新 • • 發佈：2019-01-11
1.下載Spring、fastjson的jar包以及jQuery和json2的js檔案，向專案的WEB-INF/lib目錄加入Spring和fastjson的jar包，在WebContent目錄下建立一個js資料夾，向js資料夾中加入jQuery和json2的js檔案。
2.配置web.xml：配置SpringMVC前端控制器
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>FastjsonRequestTest</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <!-- 讓servlet隨服務啟動 --> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> </web-app>
3.編寫實體類（bean）：
package com.domain; import java.io.Serializable; public class Book implements Serializable{ private Integer id; private String name; private String author; public Book() { // TODO Auto-generated constructor stub } public Book(Integer id,String name, String author) { this.id = id; this.name = name; this.author = 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 + "]"; } }
4.編寫index.jsp：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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>測試接收JSON格式的資料</title> <script type="text/javascript" src="js/jquery-3.2.0.min.js"></script> <script type="text/javascript" src="js/json2.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("#btn").click(testRequestBody); }); function testRequestBody(){ $.ajax("testRequestBody.action", { dataType : "json", type : "post", contentType : "application/json", data : JSON.stringify({"id" : 1, "name" : "Spring MVC學習"}), async : true, success : function(data){ console.log(data); $("#id").html(data.id); $("#name").html(data.name); $("#author").html(data.author); }, error:function(){ alert("資料傳送失敗"); } }); } </script> </head> <body> <button id="btn">點選</button><br> 編號：<span id="id"></span><br> 書名：<span id="name"></span><br> 作者：<span id="author"></span><br> </body> </html>
5.編寫handler處理器：BookController.java
package com.controller; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import com.alibaba.fastjson.JSONObject; import com.domain.Book; @Controller public class BookController { @RequestMapping(value="/testRequestBody") public void setJson( @RequestBody Book book, HttpServletResponse response ) throws IOException{ book.setAuthor("張三"); response.setContentType("text/html;charset=UTF-8"); //JSONobject-lib包是一個beans，collections，maps，java arrays和xml與JSON互相轉換的包 //使用JSONobject將book物件轉換成json寫出到客戶端 PrintWriter out = response.getWriter(); out.println(JSONObject.toJSONString(book)); } }
6.配置SpringMVC配置檔案：springmvc.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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:c="http://www.springframework.org/schema/c" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd"> <!-- 自動掃描base-package所指定包下面的java檔案，如果掃描到右Spring相關注解的類，則把這些類註冊為Spring的bean --> <context:component-scan base-package="com.controller"/> <!-- 實際開發中使用<mvc:annotation-driven/>代替註解介面卡和對映器 --> <mvc:annotation-driven> <!-- 設定不使用預設的訊息轉換器 --> <mvc:message-converters register-defaults="false"> <!-- 配置Spring的轉換器 --> <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中實現HttpMessageConverter介面的轉換器 --> <!-- FastJsonHttpMessageConverter是fastjson中實現了HttpMessageConverter介面的轉換器 --> <bean id="fastJsonHttpMessageConverter" class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> <!-- 加入支援的媒體型別：返回contentType --> <property name="supportedMediaTypes"> <list> <!-- 這裡順序不能寫反，一定要先寫text/html，否則IE下會出現下載提示 --> <value>text/html;charset=UTF-8</value> <value>application/json;charset=UTF-8</value> </list> </property> </bean> </mvc:message-converters> </mvc:annotation-driven> <!-- 載入靜態檔案 --> <mvc:default-servlet-handler/> <!-- 配置檢視解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 字首 <property name="prefix"> <value>/WEB-INF/</value> </property>--> <!-- 字尾 --> <property name="suffix"> <value>.jsp</value> </property> </bean> </beans>
執行前index.jsp顯示如下：
執行點選後，結果如下：
