browser 가 아닌 java 로 http 통신하기

실행환경

tomcat 7.0.57

spring 4.0.6

commons-httpclient 3.1

pom.xml 에 아래 dependency 를 추가한다

<properties> ... <httpclient.version>3.1</httpclient.version> </properties> <dependency> <groupId>commons-httpclient</groupId> <artifactId>commons-httpclient</artifactId> <version>${httpclient.version}</version> </dependency>

그리고 호출할 곳에서 아래 Util 을 호출하여 사용한다.

일단 json 으로 호출하고 json 으로 받는 것만 구현했다.

package com.tistory.hskimsky.util; /** * Description. * * @author Ha Neul Kim * @since 1.0 */ import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.commons.httpclient.methods.PostMethod; import java.io.IOException; import java.util.Iterator; import java.util.Map; import java.util.Set; public class RequestUtils { private static final String APPLICATION_JSON = "application/json; charset=utf-8"; /** * POST 방식으로 호출한다. * @param params * @return responseBody * @throws IOException */ public static String invokePostByJson(Map params) throws IOException { String url = (String) params.get("url"); HttpClient client = new HttpClient(); PostMethod method = new PostMethod(url); method.addRequestHeader("Accept", APPLICATION_JSON); method.addRequestHeader("Content-Type", APPLICATION_JSON); Set keySet = params.keySet(); Iterator it = keySet.iterator(); while (it.hasNext()) { String key = (String) it.next(); String value = (String) params.get(key); method.setParameter(key, value); } int statusCode = client.executeMethod(method); byte[] responseBody = method.getResponseBody(); return new String(responseBody, "UTF-8"); } /** * GET 방식으로 호출한다. * @param params * @return responseBody * @throws IOException */ public static String invokeGetByJson(Map params) throws IOException { String url = (String) params.get("url"); HttpClient client = new HttpClient(); GetMethod method = new GetMethod(url); method.addRequestHeader("Accept", APPLICATION_JSON); method.addRequestHeader("Content-Type", APPLICATION_JSON); StringBuilder stringBuilder = new StringBuilder(); stringBuilder.append("?"); Set keySet = params.keySet(); Iterator it = keySet.iterator(); while (it.hasNext()) { String key = (String) it.next(); String value = (String) params.get(key); if (!"?".equals(stringBuilder)) { stringBuilder.append("&"); } stringBuilder.append(key).append("=").append(value); } method.setQueryString(stringBuilder.toString()); int statusCode = client.executeMethod(method); byte[] responseBody = method.getResponseBody(); return new String(responseBody, "UTF-8"); } }