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效果展示：

浏览器截图

http://localhost:8080/Chapter/getParam/app/xml

http://localhost:8080/Chapter/getParam/app/json

主要知识点：

• SpringBoot的使用
• HTTP Content-type
• Spring属性produces
• Restful API （根据不同参数返回不同响应格式）
• Okhttp的使用

服务器：

源码

package com.didispace.web;import java.io.IOException;
import java.util.Map;import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;import com.alibaba.fastjson.JSON;
import com.didispace.util.HttpRequestUtils;import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;/*** 常见的媒体格式类型如下：text/html ： HTML格式text/plain ：纯文本格式      text/xml ：  XML格式image/gif ：gif图片格式    image/jpeg ：jpg图片格式 image/png：png图片格式以application开头的媒体格式类型：application/xhtml+xml ：XHTML格式application/xml     ： XML数据格式application/atom+xml  ：Atom XML聚合格式    application/json    ： JSON数据格式application/pdf       ：pdf格式  application/msword  ： Word文档格式application/octet-stream ： 二进制流数据（如常见的文件下载）application/x-www-form-urlencoded ： <form encType=””>中默认的encType，form表单数据被编码为key/value格式发送到服务器（表单默认的提交数据的格式）另外一种常见的媒体格式是上传文件之时使用的：multipart/form-data ： 需要在表单中进行文件上传时，就需要使用该格式以上就是我们在日常的开发中，经常会用到的若干content-type的内容格式。* @author Arison**/
@Api(value = "get请求", description = " ")
@RestController
public class HttpGetController {@ApiOperation(value = "默认", notes = "")@RequestMapping(value = "/getParam", method = RequestMethod.GET)public @ResponseBody Map<String, Object> getParam(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {Map<String, Object> goods = HttpRequestUtils.getHttpMessage(request);return goods;}@ApiOperation(value = "text/html", notes = "text/html")@RequestMapping(value = "/getParam/html", method = RequestMethod.GET, produces = "text/html; charset=utf-8")public @ResponseBody Object getParamHtml(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {Map<String, Object> goods = HttpRequestUtils.getHttpMessage(request);//注意返回类型需要是Object或者Stringreturn JSON.toJSONString(goods);}@ApiOperation(value = "text/plain", notes = "text/plain")@RequestMapping(value = "/getParam/text", method = RequestMethod.GET, produces = "text/plain; charset=utf-8")public @ResponseBody String getParamText(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {Map<String, Object> goods = HttpRequestUtils.getHttpMessage(request);return JSON.toJSONString(goods);}@ApiOperation(value = "text/xml", notes = "text/xml")@RequestMapping(value = "/getParam/xml", method = RequestMethod.GET, produces = "text/xml; charset=utf-8")public @ResponseBody Map<String, Object> getParamXml(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {Map<String, Object> goods = HttpRequestUtils.getHttpMessage(request);return goods;}@ApiOperation(value = "text/json", notes = "text/json")@RequestMapping(value = "/getParam/json", method = RequestMethod.GET, produces = "text/json; charset=utf-8")public @ResponseBody String getParamJson(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {Map<String, Object> goods = HttpRequestUtils.getHttpMessage(request);return JSON.toJSONString(goods);}@ApiOperation(value = "application/json", notes = "application/json")@RequestMapping(value = "/getParam/app/json", method = RequestMethod.GET, produces = "application/json; charset=utf-8")public @ResponseBody Map<String, Object> getParamAppJson(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {Map<String, Object> goods = HttpRequestUtils.getHttpMessage(request);return goods;}@ApiOperation(value = "application/xml", notes = "application/xml")@RequestMapping(value = "/getParam/app/xml", method = RequestMethod.GET, produces = "application/xml; charset=utf-8")public @ResponseBody Map<String, Object> getParamAppXml(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {Map<String, Object> goods = HttpRequestUtils.getHttpMessage(request);return goods;}@ApiOperation(value = "application/xhtml+xml", notes = "application/xhtml+xml")@RequestMapping(value = "/getParam/app/html", method = RequestMethod.GET, produces = "application/xhtml+xml ; charset=utf-8")public @ResponseBody Map<String, Object> getParamAppHtml(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {Map<String, Object> goods = HttpRequestUtils.getHttpMessage(request);return goods;}@ApiOperation(value = "application/text", notes = "application/text")@RequestMapping(value = "/getParam/app/text", method = RequestMethod.GET, produces = "application/text ; charset=utf-8")public @ResponseBody String getParamAppText(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {Map<String, Object> goods = HttpRequestUtils.getHttpMessage(request);return JSON.toJSONString(goods);}
}

客户端调用（Java或Android）

源码

public static final String BASE_URL = "http://192.168.253.200:8080/Chapter/";public static HttpClient httpClient = new HttpClient.Builder(BASE_URL)// 根路径.header("Cookie", "abdclejdldj82jk23jfjd")// 全局请求头 //局部可累加.header("Cache-control", "max-age=600").maxRetryCount(0)// 局部可覆盖.isDebug(false)// 局部可覆盖.retryTimeout(1000)// 局部可覆盖.cacheFile(new File("C:/Cache"))// 局部可覆盖.cacheFileSize(10240 * 1024)// 局部可覆盖.cacheType(CacheType.ONLY_NETWORK)// 局部可覆盖.cacheTime(60 * 200)// 设置10分钟 //局部可覆盖.connectTimeout(5000)// 局部可覆盖.readTimeout(5000)// 局部可覆盖.writeTimeout(7000)// 局部可覆盖.httpBase(RetrofitImpl.getInstance())// 局部可覆盖.build(true);// 保持单例httpClient.Api().send(new HttpClient.Builder().url("getParam")// 子路径.add("param3", "value1")// 局部参数.add("param4", "value2").header("cookies", "cookies")// 局部请求头.header("Accept","text/html,application/json,application/xml;q=0.9,image/webp,*/*;q=0.8").header("Cookie", "android")// 局部请求头.header("Cookie", "java")// 局部请求头---同名请求会覆盖.header("header3", "header1")// 局部请求头.header("header4", "header2")// 局部请求头.method(Method.GET).build(), new NetResquestSubscriber<Object>(new SubscriberOnNextListener<Object>() {@Overridepublic void onNext(Object t) {OkhttpUtils.println(t.toString());}}));

截图：

总结

• 本文重点在于控制响应头Content-Type的返回类型，来控制返回xml或者json格式。
• Springboot本身需要集成jackson-dataformat-xml来支持xml格式输出，否则会报406错误

        <!-- xml输出 --><dependency><groupId>com.fasterxml.jackson.dataformat</groupId><artifactId>jackson-dataformat-xml</artifactId></dependency>