本文主要介绍了java调用Restful接口的三种方法，主要包括HttpURLConnection实现，HttpClient实现和Spring的RestTemplate，具有一定的参考，感兴趣的可以了解一下
1,基本介绍
Restful接口的调用，前端一般使用ajax调用，后端可以使用的方法比较多，
本次介绍三种：
1.HttpURLConnection实现
2.HttpClient实现
3.Spring的RestTemplate
2，HttpURLConnection实现
@Controller public class RestfulAction { @Autowired private UserService userService; // 修改 @RequestMapping(value = "put/{param}", method = RequestMethod.PUT) public @ResponseBody String put(@PathVariable String param) { return "put:" + param; } // 新增 @RequestMapping(value = "post/{param}", method = RequestMethod.POST) public @ResponseBody String post(@PathVariable String param,String id,String name) { System.out.println("id:"+id); System.out.println("name:"+name); return "post:" + param; } // 删除 @RequestMapping(value = "delete/{param}", method = RequestMethod.DELETE) public @ResponseBody String delete(@PathVariable String param) { return "delete:" + param; } // 查找 @RequestMapping(value = "get/{param}", method = RequestMethod.GET) public @ResponseBody String get(@PathVariable String param) { return "get:" + param; } // HttpURLConnection 方式调用Restful接口 // 调用接口 @RequestMapping(value = "dealCon/{param}") public @ResponseBody String dealCon(@PathVariable String param) { try { String url = "http://localhost:8080/tao-manager-web/"; url+=(param+"/xxx"); URL restServiceURL = new URL(url); HttpURLConnection httpConnection = (HttpURLConnection) restServiceURL .openConnection(); //param 输入小写，转换成 GET POST DELETE PUT httpConnection.setRequestMethod(param.toUpperCase()); // httpConnection.setRequestProperty("Accept", "application/json"); if("post".equals(param)){ //打开输出开关 httpConnection.setDoOutput(true); // httpConnection.setDoInput(true); //传递参数 String input = "&id="+ URLEncoder.encode("abc", "UTF-8"); input+="&name="+ URLEncoder.encode("啊啊啊", "UTF-8"); OutputStream outputStream = httpConnection.getOutputStream(); outputStream.write(input.getBytes()); outputStream.flush(); } if (httpConnection.getResponseCode() != 200) { throw new RuntimeException( "HTTP GET Request Failed with Error code : " + httpConnection.getResponseCode()); } BufferedReader responseBuffer = new BufferedReader( new InputStreamReader((httpConnection.getInputStream()))); String output; System.out.println("Output from Server: \n"); while ((output = responseBuffer.readLine()) != null) { System.out.println(output); } httpConnection.disconnect(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return "success"; } }3.HttpClient实现
package com.taozhiye.controller; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpDelete; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.methods.HttpPut; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import com.fasterxml.jackson.databind.ObjectMapper; import com.taozhiye.entity.User; import com.taozhiye.service.UserService; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLEncoder; import java.util.ArrayList; import java.util.List; @Controller public class RestfulAction { @Autowired private UserService userService; // 修改 @RequestMapping(value = "put/{param}", method = RequestMethod.PUT) public @ResponseBody String put(@PathVariable String param) { return "put:" + param; } // 新增 @RequestMapping(value = "post/{param}", method = RequestMethod.POST) public @ResponseBody User post(@PathVariable String param,String id,String name) { User u = new User(); System.out.println(id); System.out.println(name); u.setName(id); u.setPassword(name); u.setEmail(id); u.setUsername(name); return u; } // 删除 @RequestMapping(value = "delet以上就是java调用Restful接口的三种方法的详细内容，更多请关注0133技术站其它相关文章！
