HttpClient中的DELETE請求方式

HttpClient中DELETE請求，是沒有辦法帶參數的。因爲setEntity()方法是抽象類HttpEntityEnclosingRequestBase類裏的方法，HttpPost繼承了該類，而HttpDelete類繼承的是HttpRequestBase類。下面是沒有setEntity()方法的。

需要自己創建一個新類，然後照着HttpPost的抄一遍，讓新類能夠調用setEntity()方法

import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
 
import java.net.URI;
 
public class HttpDeleteWithBody extends HttpEntityEnclosingRequestBase {
	public static final String METHOD_NAME = "DELETE";
 
	@Override
	public String getMethod(){
		return METHOD_NAME;
	}
 
	public HttpDeleteWithBody(final String uri){
		super();
		setURI(URI.create(uri));
	}
 
	public HttpDeleteWithBody(final URI uri){
		super();
		setURI(uri);
	}
 
	public HttpDeleteWithBody(){
		super();
	}
 
}

public static String jsonDeleteRequest(final String url, final Map<String, Object> param) throws Exception {
		
		//解決https請求證書的問題
		SSLContextBuilder builder = new SSLContextBuilder();
        builder.loadTrustMaterial(null, (X509Certificate[] x509Certificates, String s) -> true);
        SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(builder.build(), new String[]{"SSLv2Hello", "SSLv3", "TLSv1", "TLSv1.2"}, null, NoopHostnameVerifier.INSTANCE);
        Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()
                    .register("http", new PlainConnectionSocketFactory())
                    .register("https", socketFactory).build();
        HttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(registry);
        CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(connManager).build();
        
		String responseBody = null;
		// 創建默認的httpClient實例.    
//		final CloseableHttpClient httpclient = HttpClients.createDefault();     
		try {    
			//以post方式請求網頁   
			final HttpDeleteWithBody delete = new HttpDeleteWithBody(url);
			//將參數轉爲JSON格式
			final Gson gson = new Gson();
			final String jsonParam = gson.toJson(param);
			
			delete.setHeader("Content-Type", "application/json;charset=UTF-8"); 
			delete.setHeader("accept","application/json");
			//將POST參數以UTF-8編碼幷包裝成表單實體對象    
			final StringEntity se = new StringEntity(jsonParam, "UTF-8");
			se.setContentType("text/json");
			delete.setEntity(se);
			final CloseableHttpResponse response = httpClient.execute(delete);
			try {  
				final HttpEntity entity = response.getEntity();  
				if (entity != null) {  
					logger.info("準備獲取返回結果");
					responseBody = EntityUtils.toString(entity, "UTF-8");  
					logger.info("獲取返回結果爲：" + responseBody);
				}  
			} finally {  
				response.close();  
			}  
			logger.info(responseBody);    
		}catch(Exception e){  
			logger.error("接口請求失敗：url=" + url, e);  
		}finally {    
			// 當不再需要HttpClient實例時,關閉連接管理器以確保釋放所有佔用的系統資源    
			httpClient.getConnectionManager().shutdown();
		}
		return responseBody;
	}