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 { /** * 将请求头数据转换成Phone */ @Override protected Phone readInternal(Class 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")); } } 

         text/html;charset=UTF-8application/x-www-form-urlencoded

 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 */ @Controller public 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") @ResponseBody public Phone messageConvertor( @RequestBody Phone phone,HttpServletResponse response) { System.out.println(phone.getQno()+phone.getNumber()); return phone; } }