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本篇内容主要讲解“HttpClient远程请求struts2的文件流并实现下载的方法”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“HttpClient远程请求struts2的文件流并实现下载的方法”吧!
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HttpClientUtil工具类:
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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.client.utils.URLEncodedUtils;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.net.URI;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class HttpClientUtil {
private static final Logger logger = LoggerFactory.getLogger(HttpClientUtil.class);
/**
* 封装HTTP POST方法
*
* @param
* @param
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static String post(String url, Map paramMap) throws ClientProtocolException, IOException {
HttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
//设置请求和传输超时时间
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();
httpPost.setConfig(requestConfig);
List formparams = setHttpParams(paramMap);
UrlEncodedFormEntity param = new UrlEncodedFormEntity(formparams, "UTF-8");
httpPost.setEntity(param);
HttpResponse response = httpClient.execute(httpPost);
// logger.info("************{}", response);
String httpEntityContent = getHttpEntityContent(response);
// logger.info("************{}", httpEntityContent);
httpPost.abort();
// logger.info("************{}", httpEntityContent);
return httpEntityContent;
}
/**
* 封装HTTP POST方法
*
* @param
* @param
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static HttpResponse postForResponse(String url, Map paramMap) throws ClientProtocolException, IOException {
HttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
//设置请求和传输超时时间
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();
httpPost.setConfig(requestConfig);
List formparams = setHttpParams(paramMap);
UrlEncodedFormEntity param = new UrlEncodedFormEntity(formparams, "UTF-8");
httpPost.setEntity(param);
HttpResponse response = httpClient.execute(httpPost);
return response;
}
/**
* 封装HTTP POST方法
*
* @param
* @param （如JSON串）
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static String post(String url, String data) throws ClientProtocolException, IOException {
HttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
//设置请求和传输超时时间
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();
httpPost.setConfig(requestConfig);
httpPost.setHeader("Content-Type", "text/json; charset=utf-8");
httpPost.setEntity(new StringEntity(URLEncoder.encode(data, "UTF-8")));
HttpResponse response = httpClient.execute(httpPost);
String httpEntityContent = getHttpEntityContent(response);
httpPost.abort();
return httpEntityContent;
}
/**
* 封装HTTP GET方法
*
* @param
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static String get(String url) throws ClientProtocolException, IOException {
HttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet();
//设置请求和传输超时时间
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();
httpGet.setConfig(requestConfig);
httpGet.setURI(URI.create(url));
HttpResponse response = httpClient.execute(httpGet);
String httpEntityContent = getHttpEntityContent(response);
httpGet.abort();
return httpEntityContent;
}
/**
* 封装HTTP GET方法
*
* @param
* @param
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static String get(String url, Map paramMap) throws ClientProtocolException, IOException {
HttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet();
//设置请求和传输超时时间
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();
httpGet.setConfig(requestConfig);
List formparams = setHttpParams(paramMap);
String param = URLEncodedUtils.format(formparams, "UTF-8");
httpGet.setURI(URI.create(url + "?" + param));
HttpResponse response = httpClient.execute(httpGet);
String httpEntityContent = getHttpEntityContent(response);
httpGet.abort();
return httpEntityContent;
}
/**
* 封装HTTP PUT方法
*
* @param
* @param
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static String put(String url, Map paramMap) throws ClientProtocolException, IOException {
HttpClient httpClient = HttpClients.createDefault();
HttpPut httpPut = new HttpPut(url);
//设置请求和传输超时时间
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();
httpPut.setConfig(requestConfig);
List formparams = setHttpParams(paramMap);
UrlEncodedFormEntity param = new UrlEncodedFormEntity(formparams, "UTF-8");
httpPut.setEntity(param);
HttpResponse response = httpClient.execute(httpPut);
String httpEntityContent = getHttpEntityContent(response);
httpPut.abort();
return httpEntityContent;
}
/**
* 封装HTTP DELETE方法
*
* @param
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static String delete(String url) throws ClientProtocolException, IOException {
HttpClient httpClient = HttpClients.createDefault();
HttpDelete httpDelete = new HttpDelete();
//设置请求和传输超时时间
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();
httpDelete.setConfig(requestConfig);
httpDelete.setURI(URI.create(url));
HttpResponse response = httpClient.execute(httpDelete);
String httpEntityContent = getHttpEntityContent(response);
httpDelete.abort();
return httpEntityContent;
}
/**
* 封装HTTP DELETE方法
*
* @param
* @param
* @return
* @throws ClientProtocolException
* @throws IOException
*/
public static String delete(String url, Map paramMap) throws ClientProtocolException, IOException {
HttpClient httpClient = HttpClients.createDefault();
HttpDelete httpDelete = new HttpDelete();
//设置请求和传输超时时间
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();
httpDelete.setConfig(requestConfig);
List formparams = setHttpParams(paramMap);
String param = URLEncodedUtils.format(formparams, "UTF-8");
httpDelete.setURI(URI.create(url + "?" + param));
HttpResponse response = httpClient.execute(httpDelete);
String httpEntityContent = getHttpEntityContent(response);
httpDelete.abort();
return httpEntityContent;
}
/**
* 设置请求参数
*
* @param
* @return
*/
private static List setHttpParams(Map paramMap) {
List formparams = new ArrayList();
Set> set = paramMap.entrySet();
for (Map.Entry entry : set) {
formparams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
return formparams;
}
/**
* 获得响应HTTP实体内容
*
* @param response
* @return
* @throws IOException
* @throws UnsupportedEncodingException
*/
public static String getHttpEntityContent(HttpResponse response) throws IOException, UnsupportedEncodingException {
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream is = entity.getContent();
BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
String line = br.readLine();
StringBuilder sb = new StringBuilder();
while (line != null) {
sb.append(line + "\n");
line = br.readLine();
}
return sb.toString();
}
return "";
}
} spring跨域请求数据:
/**
* 跨域请求数据
* @param model
* @param code
* @return
*/
@RequestMapping(value = "/getDataFromCost")
public void getDataFromCost(ModelAndView model,Long eprjInfoId,Long cprjInfoId,Integer uploadType,String loginname,String t,String h,String eprjAuthMap){
GenericIdentityBean identityBean = this.genGenericIdentity((IdentityBean)model.getModel().get(WebReviewParam.MODEL_IDENTITY));
UserObject user = userSessionService.getUser(identityBean);
Map postData = new HashMap<>();
//costHost = "http://localhost:8080/cost";
String url = costHost+"/token2";
if(user != null) {
Map paramsObject;
try {
paramsObject = this.goToCost(model, 1l);
postData.put("loginname", paramsObject.get("loginname")+"");
postData.put("t", paramsObject.get("t")+"");
postData.put("h", paramsObject.get("h")+"");
postData.put("eprjInfoId", "0");
postData.put("uploadType", "50");
postData.put("cprjInfoId", cprjInfoId+"");
postData.put("isChina", "false");
postData.put("remoteUrl", "down");
} catch (Exception e1) {
e1.printStackTrace();
}
String filename = "备份文件导出.hwp";
if(!UnitChange.isEmpty(loginname)){
try {
filename = URLDecoder.decode(loginname, "utf-8");
} catch (Exception e) {
}
}
try {
HttpResponse postForResponse = HttpClientUtil.postForResponse(url, postData);
HttpEntity entity = postForResponse.getEntity();
if(entity != null) {
InputStream is = entity.getContent();
HttpServletResponse response = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getResponse();
String contentType = "application/x-hwp";
String contentDisposition="attachment;";
filename = URLEncoder.encode(filename, "UTF-8");
contentDisposition+="filename=\""+filename+"\"";
response.setContentType(contentType);
response.setHeader("accept-ranges", "bytes");
response.setHeader("Content-Disposition", contentDisposition);
try {
ServletOutputStream outputStream = response.getOutputStream();
IOUtils.copy(is, outputStream);
outputStream.flush();
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (ClientProtocolException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
}
} //获取跨域跳转需要的一些参数