舍弃公司特定的jar包，使用通用的工具类：
第一个：
package com..; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.HashMap; import java.util.Map; import org.apache.http.Header; import org.apache.http.HeaderElement; import org.apache.http.HttpEntity; import org.apache.http.NameValuePair; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.ContentType; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; import com.alibaba.fastjson.JSONObject; public class stuffLoad { public static void main(String[] args) throws IOException { Map<String ,Object> map = new HashMap<String ,Object>(); map= getStuffInfo("http://.....",jsons); String fileName = (String) map.get("fileName"); byte[] bytes = (byte[]) map.get("fileByte"); //放在本地 File file=new File("C:\Users\****\Desktop\"+fileName); OutputStream out = new FileOutputStream(file); out.write(bytes); out.close(); //前台下载 方式 // try { // response.setContentType( // "application/octet-stream; charset=GBK"); // fileName = new String(fileName.getBytes(), "ISO8859-1"); // response.setHeader("Content-Disposition", // "attachment; filename="" + fileName + """); // OutputStream out = response.getOutputStream(); // if (bytes != null) { // out.write(bytes); // } // out.close(); // } catch (Exception e) { // e.printStackTrace(); // } } /** * 发送Post请求 获取文件和名字 * @param * @return */ private static Map<String ,Object> getStuffInfo(String url,JSONObject json) { RequestConfig requestConfig = RequestConfig.custom() .setSocketTimeout(15000) .setConnectTimeout(15000) .setConnectionRequestTimeout(15000) .build(); Map<String, Object> map = new HashMap<String, Object>(); HttpPost httpPost = new HttpPost(url); httpPost.setHeader("Content-Type", "application/json"); httpPost.setEntity(new StringEntity(json.toString(), ContentType.create("application/json", "utf-8"))); CloseableHttpClient httpClient = HttpClients.createDefault(); CloseableHttpResponse response = null; HttpEntity entity = null; byte[] responseContent = null; try { httpPost.setConfig(requestConfig); // 执行请求 获取文件内容 response = httpClient.execute(httpPost); entity = response.getEntity(); responseContent = EntityUtils.toByteArray(entity); map.put("fileByte", responseContent); // responseContent = EntityUtils.toString(entity, "UTF-8"); //如果需要返回字符串改这里就行了 //获取文件名 Header contentHeader = response .getFirstHeader("Content-Disposition"); if (contentHeader != null) { HeaderElement[] values = contentHeader.getElements(); if (values.length == 1) { NameValuePair param = values[0] .getParameterByName("filename"); if (param != null) { String fileName = new String(param.getValue() .toString().getBytes("ISO-8859-1"), "GBK"); map.put("fileName", fileName); } } } } catch (Exception e) { e.printStackTrace(); } finally { try { // 关闭连接,释放资源 if (response != null) { response.close(); } if (httpClient != null) { httpClient.close(); } } catch (IOException e) { e.printStackTrace(); } } return map; } }
第二种写法：
package com.. import java.io.BufferedOutputStream; import java.io.ByteArrayOutputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.HashMap; import java.util.Map; import org.apache.http.Header; import org.apache.http.HeaderElement; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicHeader; import org.apache.http.protocol.HTTP; import com.alibaba.fastjson.JSONObject; public class HttpPostFJ { public static Map<String, Object> getStuffStream(String url,JSONObject jsonObject) { HttpClient httpClient = HttpClients.createDefault(); Map<String, Object> map = new HashMap<String, Object>(); try { // String encoderJson = URLEncoder.encode(json, HTTP.UTF_8); HttpPost method = new HttpPost(url); method.addHeader(HTTP.CONTENT_TYPE, "application/json;charset=utf-8"); StringEntity se = new StringEntity(jsonObject.toString(), "UTF-8"); se.setContentType("text/json"); se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json")); method.setEntity(se); HttpResponse httpResponse = httpClient.execute(method); BufferedOutputStream bos = null; FileOutputStream fos = null; InputStream is = null; try { System.out.println("httpClient状态:"+ httpResponse.getStatusLine().getStatusCode()); // 连接成功 if (200 == httpResponse.getStatusLine().getStatusCode()) { HttpEntity httpEntity = httpResponse.getEntity(); is = httpEntity.getContent(); // map.put("byte", StreamHelper.toByteArray(is)); map.put("byte", toByteArray(is)); Header contentHeader = httpResponse .getFirstHeader("Content-Disposition"); if (contentHeader != null) { HeaderElement[] values = contentHeader.getElements(); if (values.length == 1) { NameValuePair param = values[0] .getParameterByName("filename"); if (param != null) { String fileName = new String(param.getValue() .toString().getBytes("ISO-8859-1"), "GBK"); System.out.println("fileName----"+fileName ); map.put("fileName", fileName); } } } return map; } } catch (Exception e) { e.printStackTrace(); } finally { if (bos != null) { try { bos.close(); } catch (IOException e1) { e1.printStackTrace(); } } if (fos != null) { try { fos.close(); } catch (IOException e1) { e1.printStackTrace(); } } } } catch (Exception e) { System.out.println("接口访问失败！"+e); } return null; } public static byte[] toByteArray(InputStream is) { if (is == null) { return null; } else { ByteArrayOutputStream baos = new ByteArrayOutputStream(); toOutputStream(is, baos); return baos.toByteArray(); } } public static void toOutputStream(InputStream is, OutputStream os) { byte[] buffer = new byte[2048]; try { int bytesRead; while((bytesRead = is.read(buffer, 0, 1024)) != -1) { os.write(buffer, 0, bytesRead); } } catch (IOException var5) { System.out.println("error:"+var5); } } }