/** * 抽取一个公共的类 * * @author xz * */@Servicepublic class ApiService { @Autowired private RequestConfig config; @Autowired private CloseableHttpClient httpClient; /** * 无参的get请求 * * @param url * @return */ public String doGet(String url) { // HttpGet对象 HttpGet get = new HttpGet(url); get.setConfig(config); CloseableHttpResponse response = null; try { response = httpClient.execute(get); if (response != null && response.getStatusLine().getStatusCode() == 200) { return EntityUtils.toString(response.getEntity(), "utf-8"); } } catch (IOException e) { e.printStackTrace(); } finally { if (response != null) { try { response.close(); } catch (IOException e) { e.printStackTrace(); } } } return null; } /** * 有参的get请求 * * @param url * @return */ public String doGet(String url, Map<String, Object> params) { List<NameValuePair> nvprs = new ArrayList<>(); // 遍历map for (String key : params.keySet()) { NameValuePair nvpr = new BasicNameValuePair(key, params.get(key).toString()); nvprs.add(nvpr); } CloseableHttpResponse response = null; try { URI uri = new URIBuilder(url).addParameters(nvprs).build(); // HttpGet对象 HttpGet get = new HttpGet(uri); get.setConfig(config); response = httpClient.execute(get); if (response != null && response.getStatusLine().getStatusCode() == 200) { return EntityUtils.toString(response.getEntity(), "utf-8"); } } catch (Exception e) { e.printStackTrace(); } finally { if (response != null) { try { response.close(); } catch (IOException e) { e.printStackTrace(); } } } return null; } // Save Update Delete (状态不同 返回值不一样? 有的有返回值 有的没有返回值。) public Result doPost(String url, Map<String, Object> params) { List<NameValuePair> nvprs = new ArrayList<>(); // 遍历map for (String key : params.keySet()) { NameValuePair nvpr = new BasicNameValuePair(key, params.get(key).toString()); nvprs.add(nvpr); } CloseableHttpResponse response = null; try { URI uri = new URIBuilder(url).addParameters(nvprs).build(); // HttpGet对象 HttpPost post = new HttpPost(uri); post.setConfig(config); response = httpClient.execute(post); return new Result(response.getStatusLine().getStatusCode(), EntityUtils.toString(response.getEntity(), "utf-8")); } catch (Exception e) { e.printStackTrace(); } finally { if (response != null) { try { response.close(); } catch (IOException e) { e.printStackTrace(); } } } return null; } // Save Update Delete (状态不同 返回值不一样? 有的有返回值 有的没有返回值。) public Result doPost(String url) { CloseableHttpResponse response = null; try { // HttpGet对象 HttpPost post = new HttpPost(url); post.setConfig(config); response = httpClient.execute(post); return new Result(response.getStatusLine().getStatusCode(), EntityUtils.toString(response.getEntity(), "utf-8")); } catch (Exception e) { e.printStackTrace(); } finally { if (response != null) { try { response.close(); } catch (IOException e) { e.printStackTrace(); } } } return null; }}

对以上方法应用的示例

import java.io.IOException;import java.util.ArrayList;import java.util.HashMap;import java.util.LinkedHashMap;import java.util.List;import java.util.Map;import org.apache.commons.lang3.StringUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.fasterxml.jackson.databind.JsonNode;import com.fasterxml.jackson.databind.ObjectMapper;import com.fasterxml.jackson.databind.node.ArrayNode;import com.taotao.manage.pojo.Item;@Servicepublic class ItemService { @Autowired private ApiService apiService; private ObjectMapper mapper=new ObjectMapper(); public Item iteminfo(Long itemId) { Map<String,Object> params=new HashMap<String,Object>(); params.put("itemId", itemId); String data=apiService.doGet("http://manage.taotao.com/rest/item/queryId",params); System.out.println(data); if(StringUtils.isNotBlank(data)) { try { //当封装实体类时 Item item=mapper.readValue(data,Item.class); return item; } catch (IOException e) { e.printStackTrace(); } return null; } return null; } }