spring消息转换器使用详解

网友投稿 296 2023-05-02


spring消息转换器使用详解

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

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

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 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http://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

xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:context="http://springframework.org/schema/context"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:aop="http://springframework.org/schema/aop"

xmlns:mvc="http://springframework.org/schema/mvc"

xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd

http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd

http://springframework.org/schema/tx http://springframework.org/schema/tx/spring-tx.xsd

http://springframework.org/schema/aop http://springframework.org/schema/aop/spring-aop.xsd

http://springframework.org/schema/mvc http://springframework.org/schema/mvc/spring-mvc.xsd

">

text/html;charset=UTF-8

application/x-www-form-urlencoded

xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:context="http://springframework.org/schema/context"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:aop="http://springframework.org/schema/aop"

xmlns:mvc="http://springframework.org/schema/mvc"

xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd

http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd

http://springframework.org/schema/tx http://springframework.org/schema/tx/spring-tx.xsd

http://springframework.org/schema/aop http://springframework.org/schema/aop/spring-aop.xsd

http://springframework.org/schema/mvc http://springframework.org/schema/mvc/spring-mvc.xsd

">

text/html;charset=UTF-8

application/x-www-form-urlencoded

servlet测试

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;

}

}

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


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