本文实例为大家分享了spring消息转换器的具体代码，供大家参考，具体内容如下
//domain
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package com.crazy.goods.tools;/** * 0755-351512 * @author Administrator * */public class Phone { private String qno; private String number; public String getQno() { return qno; } public void setQno(String qno) { this.qno = qno; } public String getNumber() { return number; } public void setNumber(String number) { this.number = number; } } |
//消息转换器 要实现一个抽象类AbstractHttpMessageConverter
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package com.crazy.goods.tools;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import org.springframework.http.HttpInputMessage;import org.springframework.http.HttpOutputMessage;import org.springframework.http.converter.AbstractHttpMessageConverter;import org.springframework.http.converter.HttpMessageNotReadableException;import org.springframework.http.converter.HttpMessageNotWritableException;public class MyMessageConvertor extends AbstractHttpMessageConverter<Phone> { /** * 将请求头数据转换成Phone */ @Override protected Phone readInternal(Class<? extends Phone> arg0, HttpInputMessage msg) throws IOException, HttpMessageNotReadableException { //参数必须使用post提交必须在body中 InputStream is=msg.getBody(); BufferedReader br=new BufferedReader(new InputStreamReader(is)); String param=br.readLine(); String phone=param.split("=")[1]; Phone phoneObj=new Phone(); phoneObj.setQno(phone.split("-")[0]); phoneObj.setNumber(phone.split("-")[1]); return phoneObj; } /** * 当前的转换器支持转换的类 */ @Override protected boolean supports(Class<?> arg0) { if(arg0==Phone.class){ return true; } return false; } /** * 用于将返回的对象转换成字符串显示在网页 */ @Override protected void writeInternal(Phone phone, HttpOutputMessage arg1) throws IOException, HttpMessageNotWritableException { String p=phone.getQno()+"-"+phone.getNumber(); arg1.getBody().write(p.getBytes("UTF-8")); }} |
//springmvc.xml 要配置bean：消息转换器，只有post提交方式才会被转换器拦截
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<?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:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <!--springmvc只能扫描控制层 --> <context:component-scan base-package="com.crazy.goods"> <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/> <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Repository"/> </context:component-scan> <!--消息转换器 必须使用post提交 --> <mvc:annotation-driven> <mvc:message-converters> <bean class="com.crazy.goods.tools.MyMessageConvertor"> <property name="supportedMediaTypes"> <list> <value>text/html;charset=UTF-8</value> <value>application/x-www-form-urlencoded</value> </list> </property> </bean> </mvc:message-converters> </mvc:annotation-driven></beans> |
servlet测试
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package com.crazy.goods.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import com.crazy.goods.tools.Phone;/*** @author Administrator* 创建时间：2017年7月1日下午3:11:27*/@Controllerpublic class ReservePageServelt {// /**// * forward:转发// * redirect:重定向// * @param req// * @param resp// * @return// * @throws ServletException// * @throws IOException// */// @RequestMapping(value="/add",method={RequestMethod.GET})// public String doGet(HttpServletRequest req, HttpServletResponse resp/*,@PathVariable("testid") String testid*/) throws ServletException, IOException {// req.getRequestDispatcher("/reversegood.jsp").forward(req, resp);// return "/reversegood.jsp";// resp.getWriter().print(testid);// }//消息转换器思路，//原理就是将请求体或者请求头的数据转换为action方法的参数，同时将方法的返回值的内容转换为响应头//当url路径访问过来时，看到使用了@RequestBody注解，这个注解标识这个类要被消息转换器处理，就会springmvcxml文件中读到消息转换器，然后进入supports方法//判断这个类是否被指定的转换器支持，如果支持，就调用readInternal方法，进行切割，然后将值传递到对象中,处理完成为对象之后，就会调用writeInternal转换为响应头@RequestMapping(value="/add")@ResponseBodypublic Phone messageConvertor( @RequestBody Phone phone,HttpServletResponse response) {System.out.println(phone.getQno()+phone.getNumber());return phone;}} |
总结：消息转换器的原理就是，自定义将请求体的数据转换为形参（对象），然后将方法的返回值内容转换为响应头
步骤：
当url路径访问过来时，看到使用了@RequestBody注解，这个注解标识这个类要被消息转换器处理，就会springmvcxml文件中读到消息转换器，然后进入supports方法
判断这个类是否被指定的转换器支持，如果支持，就调用readInternal方法，进行切割，然后将值传递到对象中.
处理完成为对象之后，就会调用writeInternal转换为响应头
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
