Java调用REST接口（get，post请求方法）

网上的调用方法实例千奇百怪，以下为本人自己整理的Java调用rest接口方法实例，包含get请求和post请求，可创建工具类方便调用，其中get、post请求解决了入出参中文乱码问题。

get方式请求

//get方式请求 public String restCallerGet(String path, String param) { 	//path 接口路径 xxx/xxx/xxx 	//param 入参 ?xxx=x&xxx=x&xxx=x     //接口ip 	String httpip = "http://127.0.0.1:8080"; 	 	String data = "";      //url拼接 	String lasturl = httpip + path + param; 	try{ 		URL url = new URL(lasturl); 		//打开和url之间的连接 		HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); 		 		//请求头 		urlConn.setRequestProperty("Accept-Charset", "utf-8"); 		urlConn.setRequestProperty("Content-Type", "application/json; charset=utf-8"); 		 		urlConn.setDoOutput(true); 		urlConn.setDoInput(true); 		urlConn.setRequestMethod("GET");//GET和POST必须全大写 		urlConn.connect(); 		 		int code = urlConn.getResponseCode();//获得响应码 		if(code == 200) {//响应成功，获得响应的数据 		    //InputStream is = urlConn.getInputStream();//得到数据流（输入流） 			//byte[] buffer = new byte[1024]; 			//int length = 0; 			//while ((length = is.read(buffer)) != -1) { 			//	String res = new String(buffer, 0, length); 			//	data += res; 			//} 			//System.out.println(data); 				 			//解决中文乱码 			BufferedReader reader = new BufferedReader(new InputStreamReader(urlConn.getInputStream(),"UTF-8")); 			data = reader.readLine(); 		}         urlConn.disconnect();   //断开连接  	}catch (Exception e) { 		e.printStackTrace(); 	}  	return data; }

post方式请求

//post方式请求 public String restCallerPost(String path, String param) { 	//path 接口路径 xxx/xxx/xxx 	//param 入参json {} 	//接口ip 	String httpip = "http://127.0.0.1:8080"; 	 	int responseCode; 	//String urlParam = "?aaa=1&bbb=2";     String urlParam = ""; 	     String data = ""; 	 	//url拼接 	String lasturl = httpip + path + urlParam; 	try { 		URL restURL = new URL(lasturl); 		HttpURLConnection conn = (HttpURLConnection) restURL.openConnection(); 		conn.setRequestMethod("POST"); 		//请求头 		conn.setRequestProperty("Content-Type", "application/json; charset=utf-8"); 		conn.setDoOutput(true); 		 		//输入流 		//OutputStream os = conn.getOutputStream(); 		//解决中文乱码 		OutputStreamWriter os = new OutputStreamWriter(conn.getOutputStream(), "UTF-8"); 		os.write(param); 		os.flush(); 		// 输出response code 		responseCode = conn.getResponseCode(); 		// 输出response 		if(responseCode == 200){ 			//输出流 			//BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); 			//解决中文乱码 			BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8")); 			data = reader.readLine(); 		} else { 			data = "false"; 		} 		// 断开连接 		os.close(); 		conn.disconnect(); 		 	} catch (Exception e) { 		e.printStackTrace(); 	} 	 	return data; }

main方法调用测试

public static void main(String[] args) { 	// TODO Auto-generated method stub 	     //接口路径 	String pathGet = "/xxx/xxx/getFunction";     String pathPost = "/xxx/xxx/postFunction"; 	 	//get 	String paramGet = "?aaa=1&bbb=2";     //RestCallerUtil为自行封装的工具类 	RestCallerUtil rcuGet = new RestCallerUtil(); 	String resultDataGet = rcuGet.restCallerGet(pathGet, paramGet); 	System.out.println(resultDataGet); 	 	//post 	String paramPost = "{'aaa':'1','bbb':'2'}";     //RestCallerUtil为自行封装的工具类 	RestCallerUtil rcuPost = new RestCallerUtil(); 	String resultDataPost = rcuPost.restCallerPost(pathPost, paramPost); 	System.out.println(resultDataPost);  }