spring消息转换器使用详解

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;  }  }

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"));  }}

<?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>

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;}}