使用HttpClient 发送 GET、POST、PUT、Delete请求及文件上传

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import java.io.File; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.Set; import org.apache.http.HttpEntity; import org.apache.http.NameValuePair; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.CloseableHttpResponse; 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.entity.ContentType; import org.apache.http.entity.StringEntity; import org.apache.http.entity.mime.HttpMultipartMode; import org.apache.http.entity.mime.MultipartEntityBuilder; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClientBuilder; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import org.caeit.cloud.dev.entity.HttpResponse; public class HttpClientUtil { * 发送http get请求 public static HttpResponse httpGet(String url,Map<String,String> headers,String encode){ HttpResponse response = new HttpResponse(); if (encode == null ){ encode = "utf-8" ; String content = null ; // since 4.3 不再使用 DefaultHttpClient CloseableHttpClient closeableHttpClient = HttpClientBuilder.create().build(); HttpGet httpGet = new HttpGet(url); // 设置header if (headers != null && headers.size() > 0 ) { for (Map.Entry<String, String> entry : headers.entrySet()) { httpGet.setHeader(entry.getKey(),entry.getValue()); CloseableHttpResponse httpResponse = null ; try { httpResponse = closeableHttpClient.execute(httpGet); HttpEntity entity = httpResponse.getEntity(); content = EntityUtils.toString(entity, encode); response.setBody(content); response.setHeaders(httpResponse.getAllHeaders()); response.setReasonPhrase(httpResponse.getStatusLine().getReasonPhrase()); response.setStatusCode(httpResponse.getStatusLine().getStatusCode()); } catch (Exception e) { e.printStackTrace(); } finally { try { httpResponse.close(); } catch (IOException e) { e.printStackTrace(); try { // 关闭连接、释放资源 closeableHttpClient.close(); } catch (IOException e) { e.printStackTrace(); return response; * 发送 http post 请求，参数以form表单键值对的形式提交。 public static HttpResponse httpPostForm(String url,Map<String,String> params, Map<String,String> headers,String encode){ HttpResponse response = new HttpResponse(); if (encode == null ){ encode = "utf-8" ; // HttpClients.createDefault()等价于 HttpClientBuilder.create().build(); CloseableHttpClient closeableHttpClient = HttpClients.createDefault(); HttpPost httpost = new HttpPost(url); // 设置header if (headers != null && headers.size() > 0 ) { for (Map.Entry<String, String> entry : headers.entrySet()) { httpost.setHeader(entry.getKey(),entry.getValue()); // 组织请求参数 List<NameValuePair> paramList = new ArrayList <NameValuePair> (); if (params != null && params.size() > 0 ){ Set <String> keySet = params.keySet(); for (String key : keySet) { paramList.add( new BasicNameValuePair(key, params.get(key))); try { httpost.setEntity( new UrlEncodedFormEntity(paramList, encode)); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); String content = null ; CloseableHttpResponse httpResponse = null ; try { httpResponse = closeableHttpClient.execute(httpost); HttpEntity entity = httpResponse.getEntity(); content = EntityUtils.toString(entity, encode); response.setBody(content); response.setHeaders(httpResponse.getAllHeaders()); response.setReasonPhrase(httpResponse.getStatusLine().getReasonPhrase()); response.setStatusCode(httpResponse.getStatusLine().getStatusCode()); } catch (Exception e) { e.printStackTrace(); } finally { try { httpResponse.close(); } catch (IOException e) { e.printStackTrace(); try { // 关闭连接、释放资源 closeableHttpClient.close(); } catch (IOException e) { e.printStackTrace(); return response; * 发送 http post 请求，参数以原生字符串进行提交 * @param url * @param encode * @return public static HttpResponse httpPostRaw(String url,String stringJson,Map<String,String> headers, String encode){ HttpResponse response = new HttpResponse(); if (encode == null ){ encode = "utf-8" ; // HttpClients.createDefault()等价于 HttpClientBuilder.create().build(); CloseableHttpClient closeableHttpClient = HttpClients.createDefault(); HttpPost httpost = new HttpPost(url); // 设置header httpost.setHeader("Content-type", "application/json" ); if (headers != null && headers.size() > 0 ) { for (Map.Entry<String, String> entry : headers.entrySet()) { httpost.setHeader(entry.getKey(),entry.getValue()); // 组织请求参数 StringEntity stringEntity = new StringEntity(stringJson, encode); httpost.setEntity(stringEntity); String content = null ; CloseableHttpResponse httpResponse = null ; try { // 响应信息 httpResponse = closeableHttpClient.execute(httpost); HttpEntity entity = httpResponse.getEntity(); content = EntityUtils.toString(entity, encode); response.setBody(content); response.setHeaders(httpResponse.getAllHeaders()); response.setReasonPhrase(httpResponse.getStatusLine().getReasonPhrase()); response.setStatusCode(httpResponse.getStatusLine().getStatusCode()); } catch (Exception e) { e.printStackTrace(); } finally { try { httpResponse.close(); } catch (IOException e) { e.printStackTrace(); try { // 关闭连接、释放资源 closeableHttpClient.close(); } catch (IOException e) { e.printStackTrace(); return response; * 发送 http put 请求，参数以原生字符串进行提交 * @param url * @param encode * @return public static HttpResponse httpPutRaw(String url,String stringJson,Map<String,String> headers, String encode){ HttpResponse response = new HttpResponse(); if (encode == null ){ encode = "utf-8" ; // HttpClients.createDefault()等价于 HttpClientBuilder.create().build(); CloseableHttpClient closeableHttpClient = HttpClients.createDefault(); HttpPut httpput = new HttpPut(url); // 设置header httpput.setHeader("Content-type", "application/json" ); if (headers != null && headers.size() > 0 ) { for (Map.Entry<String, String> entry : headers.entrySet()) { httpput.setHeader(entry.getKey(),entry.getValue()); // 组织请求参数 StringEntity stringEntity = new StringEntity(stringJson, encode); httpput.setEntity(stringEntity); String content = null ; CloseableHttpResponse httpResponse = null ; try { // 响应信息 httpResponse = closeableHttpClient.execute(httpput); HttpEntity entity = httpResponse.getEntity(); content = EntityUtils.toString(entity, encode); response.setBody(content); response.setHeaders(httpResponse.getAllHeaders()); response.setReasonPhrase(httpResponse.getStatusLine().getReasonPhrase()); response.setStatusCode(httpResponse.getStatusLine().getStatusCode()); } catch (Exception e) { e.printStackTrace(); } finally { try { httpResponse.close(); } catch (IOException e) { e.printStackTrace(); try { closeableHttpClient.close(); // 关闭连接、释放资源 } catch (IOException e) { e.printStackTrace(); return response; * 发送http delete请求 public static HttpResponse httpDelete(String url,Map<String,String> headers,String encode){ HttpResponse response = new HttpResponse(); if (encode == null ){ encode = "utf-8" ; String content = null ; // since 4.3 不再使用 DefaultHttpClient CloseableHttpClient closeableHttpClient = HttpClientBuilder.create().build(); HttpDelete httpdelete = new HttpDelete(url); // 设置header if (headers != null && headers.size() > 0 ) { for (Map.Entry<String, String> entry : headers.entrySet()) { httpdelete.setHeader(entry.getKey(),entry.getValue()); CloseableHttpResponse httpResponse = null ; try { httpResponse = closeableHttpClient.execute(httpdelete); HttpEntity entity = httpResponse.getEntity(); content = EntityUtils.toString(entity, encode); response.setBody(content); response.setHeaders(httpResponse.getAllHeaders()); response.setReasonPhrase(httpResponse.getStatusLine().getReasonPhrase()); response.setStatusCode(httpResponse.getStatusLine().getStatusCode()); } catch (Exception e) { e.printStackTrace(); } finally { try { httpResponse.close(); } catch (IOException e) { e.printStackTrace(); try { // 关闭连接、释放资源 closeableHttpClient.close(); } catch (IOException e) { e.printStackTrace(); return response; * 发送 http post 请求，支持文件上传 public static HttpResponse httpPostFormMultipart(String url,Map<String,String> params, List<File> files,Map<String,String> headers,String encode){ HttpResponse response = new HttpResponse(); if (encode == null ){ encode = "utf-8" ; CloseableHttpClient closeableHttpClient = HttpClients.createDefault(); HttpPost httpost = new HttpPost(url); // 设置header if (headers != null && headers.size() > 0 ) { for (Map.Entry<String, String> entry : headers.entrySet()) { httpost.setHeader(entry.getKey(),entry.getValue()); MultipartEntityBuilder mEntityBuilder = MultipartEntityBuilder.create(); mEntityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE); mEntityBuilder.setCharset(Charset.forName(encode)); // 普通参数 ContentType contentType = ContentType.create("text/plain",Charset.forName(encode)); // 解决中文乱码 if (params != null && params.size() > 0 ) { Set <String> keySet = params.keySet(); for (String key : keySet) { mEntityBuilder.addTextBody(key, params.get(key),contentType); // 二进制参数 if (files != null && files.size() > 0 ) { for (File file : files) { mEntityBuilder.addBinaryBody( "file" , file); httpost.setEntity(mEntityBuilder.build()); String content = null ; CloseableHttpResponse httpResponse = null ; try { httpResponse = closeableHttpClient.execute(httpost); HttpEntity entity = httpResponse.getEntity(); content = EntityUtils.toString(entity, encode); response.setBody(content); response.setHeaders(httpResponse.getAllHeaders()); response.setReasonPhrase(httpResponse.getStatusLine().getReasonPhrase()); response.setStatusCode(httpResponse.getStatusLine().getStatusCode()); } catch (Exception e) { e.printStackTrace(); } finally { try { httpResponse.close(); } catch (IOException e) { e.printStackTrace(); try { // 关闭连接、释放资源 closeableHttpClient.close(); } catch (IOException e) { e.printStackTrace(); return response;

发送Get请求：

HttpResponse httpGet(String url,Map<String,String> headers,String encode)

发送Post请求，同表单Post提交

HttpResponse httpPostForm(String url,Map<String,String> params, Map<String,String> headers,String encode)

发送Post Raw请求

HttpResponse httpPostRaw(String url,String stringJson,Map<String,String> headers, String encode)

发送Put Raw请求

HttpResponse httpPutRaw(String url,String stringJson,Map<String,String> headers, String encode)

发送Delete请求

HttpResponse httpDelete(String url,Map<String,String> headers,String encode)

1、since 4.3 不再使用 DefaultHttpClient

2、UrlEncodedFormEntity 与 StringEntity 区别

2.1、UrlEncodedFormEntity()的形式比较单一，只能是普通的键值对，局限性相对较大。

2.2、而StringEntity()的形式比较自由，只要是字符串放进去，不论格式都可以。

3、以raw方式发送请求时，需指定 Content type：httpost.setHeader("Content-type", "application/json"); 否则默认使用 Content type 'text/plain;charset=UTF-8'。