Example code of spring message converter

//domain

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;
    }
    
}

//Message Converter To implement an abstract class AbstractHttpMessageConverter

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     */
    @Overrideprotected 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     */@Overrideprotected 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     */@Overrideprotected void writeInternal(Phone phone, HttpOutputMessage arg1)throws IOException, HttpMessageNotWritableException {
        String p=phone.getQno()+"-"+phone.getNumber();
        arg1.getBody().write(p.getBytes("UTF-8"));
    }

}

//springmvc.xml To configure bean: message converter, only the post submission method will be intercepted by the converter

<?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/context http://www.springframework.org/schema/tx http://www.springframework.org/schema/aop http://www.springframework.org/schema/mvc ">
    <!--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 test

<br>

package com.crazy.goods.servlet;

<br>

import java.io.IOException;

<br>

import javax.servlet.ServletException;<br>import javax.servlet.annotation.WebServlet;<br>import javax.servlet.http. HttpServlet;<br>import javax.servlet.http.HttpServletRequest;<br>import javax.servlet.http.HttpServletResponse;

<br>

import org.springframework.stereotype.Controller;<br>import org.springframework. web.bind.annotation.PathVariable;<br>import org.springframework.web.bind.annotation.RequestBody;<br>import org.springframework.web.bind.annotation.RequestMapping;<br>import org.springframework.web. bind.annotation.RequestMethod;<br>import org.springframework.web.bind.annotation.ResponseBody;

<br>

import com.crazy.goods.tools.Phone;

<br>

/** <br> * @author Administrator<br> * Creation time: July 1, 2017 3:11:27 pm<br>*/<br>@Controller<br>public class ReservePageServelt {

<br>

// /**<br>// * forward: forward <br>// * redirect: redirect <br>// * @param req<br>// * @param resp<br>// * @return<br>// * @throws ServletException<br>// * @throws IOException<br>//*/<br>// @RequestMapping(value="/add",method ={RequestMethod.GET})<br>// public String doGet(HttpServletRequest req, HttpServletResponse resp/*,@PathVariable("testid") String testid*/) throws ServletException, IOException {<br>// req.getRequestDispatcher( "/reversegood.jsp").forward(req, resp);<br>// return "/reversegood.jsp";<br>// resp.getWriter().print(testid);<br>// } <br><br><br> //Message converter idea, <br><br> //The principle is to convert the request body or request header data into the parameters of the action method, and at the same time convert the content of the method's return value For the response header <br> //When the url path is accessed, the @RequestBody annotation is used. This annotation indicates that this class is to be processed by the message converter. The message converter will be read in the springmvcxml file, and then the supports method will be entered. <br> //Determine whether this class is supported by the specified converter. If it is supported, call the readInternal method, cut it, and then pass the value to the object. After processing is completed into the object, writeInternal will be called to convert into a response header<br> @RequestMapping(value="/add")<br> @ResponseBody<br> public Phone messageConvertor( @RequestBody Phone phone,HttpServletResponse response) {<br> System.out.println(phone.getQno()+phone. getNumber());<br> return phone;<br><br> }<br><br>}

 <br>

Summary: The principle of the message converter is, Customize to convert the request body data into formal parameters (objects), and then convert the method's return value content into response headers

Steps:

When the url path is accessed, you will see the use The @RequestBody annotation indicates that this class is to be processed by the message converter. The message converter will be read in the springmvcxml file, and then the supports method <br> will be entered to determine whether this class is supported by the specified converter. If so, Call the readInternal method, cut, and then pass the value to the object.

After processing is completed into an object, writeInternal will be called to convert into a response header

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