本文實(shí)例為大家分享了spring消息轉(zhuǎn)換器的具體代碼，供大家參考，具體內(nèi)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; } } |
//消息轉(zhuǎn)換器 要實(shí)現(xiàn)一個(gè)抽象類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> { /** * 將請(qǐng)求頭數(shù)據(jù)轉(zhuǎn)換成Phone */ @Override protected Phone readInternal(Class<? extends Phone> arg0, HttpInputMessage msg) throws IOException, HttpMessageNotReadableException { //參數(shù)必須使用post提交必須在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; } /** * 當(dāng)前的轉(zhuǎn)換器支持轉(zhuǎn)換的類 */ @Override protected boolean supports(Class<?> arg0) { if(arg0==Phone.class){ return true; } return false; } /** * 用于將返回的對(duì)象轉(zhuǎn)換成字符串顯示在網(wǎng)頁(yè) */ @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：消息轉(zhuǎn)換器，只有post提交方式才會(huì)被轉(zhuǎn)換器攔截
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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只能掃描控制層 --> <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> <!--消息轉(zhuǎn)換器 必須使用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測(cè)試
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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* 創(chuàng)建時(shí)間：2017年7月1日下午3:11:27*/@Controllerpublic class ReservePageServelt {// /**// * forward:轉(zhuǎn)發(fā)// * 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);// }//消息轉(zhuǎn)換器思路，//原理就是將請(qǐng)求體或者請(qǐng)求頭的數(shù)據(jù)轉(zhuǎn)換為action方法的參數(shù)，同時(shí)將方法的返回值的內(nèi)容轉(zhuǎn)換為響應(yīng)頭//當(dāng)url路徑訪問(wèn)過(guò)來(lái)時(shí)，看到使用了@RequestBody注解，這個(gè)注解標(biāo)識(shí)這個(gè)類要被消息轉(zhuǎn)換器處理，就會(huì)springmvcxml文件中讀到消息轉(zhuǎn)換器，然后進(jìn)入supports方法//判斷這個(gè)類是否被指定的轉(zhuǎn)換器支持，如果支持，就調(diào)用readInternal方法，進(jìn)行切割，然后將值傳遞到對(duì)象中,處理完成為對(duì)象之后，就會(huì)調(diào)用writeInternal轉(zhuǎn)換為響應(yīng)頭@RequestMapping(value="/add")@ResponseBodypublic Phone messageConvertor( @RequestBody Phone phone,HttpServletResponse response) {System.out.println(phone.getQno()+phone.getNumber());return phone;}} |
總結(jié)：消息轉(zhuǎn)換器的原理就是，自定義將請(qǐng)求體的數(shù)據(jù)轉(zhuǎn)換為形參（對(duì)象），然后將方法的返回值內(nèi)容轉(zhuǎn)換為響應(yīng)頭
步驟：
當(dāng)url路徑訪問(wèn)過(guò)來(lái)時(shí)，看到使用了@RequestBody注解，這個(gè)注解標(biāo)識(shí)這個(gè)類要被消息轉(zhuǎn)換器處理，就會(huì)springmvcxml文件中讀到消息轉(zhuǎn)換器，然后進(jìn)入supports方法
判斷這個(gè)類是否被指定的轉(zhuǎn)換器支持，如果支持，就調(diào)用readInternal方法，進(jìn)行切割，然后將值傳遞到對(duì)象中.
處理完成為對(duì)象之后，就會(huì)調(diào)用writeInternal轉(zhuǎn)換為響應(yīng)頭
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
