Java 发送http请求上传文件功能实例

废话不多说了，直接给大家贴代码了，具体代码如下所示：

package wxapi.wxhelper; 
import java.io.bufferedreader; 
import java.io.datainputstream; 
import java.io.dataoutputstream; 
import java.io.file; 
import java.io.fileinputstream; 
import java.io.ioexception; 
import java.io.inputstreamreader; 
import java.io.outputstream; 
import java.net.httpurlconnection; 
import java.net.url; 
import java.net.urlconnection; 
import java.util.date; 
import java.util.map; 
import java.util.map.entry; 
public class httprequestutil { 
  /** 
   * 发送get请求 
   * 
   * @param requesturl 
   *      请求url 
   * @param requestheader 
   *      请求头 
   * @param responseencoding 
   *      响应编码 
   * @return 页面响应html 
   */ 
  public static string sendget(string requesturl, map<string, string> requestheader, string responseencoding) { 
    string result = ""; 
    bufferedreader reader = null; 
    try { 
      if (requesturl == null || requesturl.isempty()) { 
        return result; 
      } 
      url realurl = new url(requesturl); 
      urlconnection connection = realurl.openconnection(); 
      connection.setrequestproperty("accept", "text/html, application/xhtml+xml, image/jxr, */*"); 
      connection.setrequestproperty("user-agent", "mozilla/5.0 (windows nt 10.0; wow64; rv:53.0) gecko/20100101 firefox/53.0"); 
      if (requestheader != null && requestheader.size() > 0) { 
        for (entry<string, string> entry : requestheader.entryset()) { 
          connection.setrequestproperty(entry.getkey(), entry.getvalue()); 
        } 
      } 
      connection.connect(); 
      if (responseencoding == null || responseencoding.isempty()) { 
        responseencoding = "utf-8"; 
      } 
      reader = new bufferedreader(new inputstreamreader(connection.getinputstream(), responseencoding)); 
      string line; 
      while ((line = reader.readline()) != null) { 
        result += line; 
      } 
    } catch (exception e) { 
      system.out.println("发送get请求出现异常！"); 
      e.printstacktrace(); 
    } finally { 
      try { 
        if (reader != null) { 
          reader.close(); 
        } 
      } catch (exception e) { 
        e.printstacktrace(); 
      } 
    } 
    return result; 
  } 
  /** 
   * 发送post请求 
   *  
   * @param requesturl 
   *      请求url 
   * @param requestheader 
   *      请求头 
   * @param formtexts 
   *      表单数据 
   * @param files 
   *      上传文件 
   * @param requestencoding 
   *      请求编码 
   * @param responseencoding 
   *      响应编码 
   * @return 页面响应html 
   */ 
  public static string sendpost(string requesturl, map<string, string> requestheader, map<string, string> formtexts, map<string, string> files, string requestencoding, string responseencoding) { 
    outputstream out = null; 
    bufferedreader reader = null; 
    string result = ""; 
    try { 
      if (requesturl == null || requesturl.isempty()) { 
        return result; 
      } 
      url realurl = new url(requesturl); 
      httpurlconnection connection = (httpurlconnection) realurl.openconnection(); 
      connection.setrequestproperty("accept", "text/html, application/xhtml+xml, image/jxr, */*"); 
      connection.setrequestproperty("user-agent", "mozilla/5.0 (windows nt 10.0; wow64; rv:53.0) gecko/20100101 firefox/53.0"); 
      if (requestheader != null && requestheader.size() > 0) { 
        for (entry<string, string> entry : requestheader.entryset()) { 
          connection.setrequestproperty(entry.getkey(), entry.getvalue()); 
        } 
      } 
      connection.setdooutput(true); 
      connection.setdoinput(true); 
      connection.setrequestmethod("post"); 
      if (requestencoding == null || requestencoding.isempty()) { 
        requestencoding = "utf-8"; 
      } 
      if (responseencoding == null || responseencoding.isempty()) { 
        responseencoding = "utf-8"; 
      } 
      if (requestheader != null && requestheader.size() > 0) { 
        for (entry<string, string> entry : requestheader.entryset()) { 
          connection.setrequestproperty(entry.getkey(), entry.getvalue()); 
        } 
      } 
      if (files == null || files.size() == 0) { 
        connection.setrequestproperty("content-type", "application/x-www-form-urlencoded"); 
        out = new dataoutputstream(connection.getoutputstream()); 
        if (formtexts != null && formtexts.size() > 0) { 
          string formdata = ""; 
          for (entry<string, string> entry : formtexts.entryset()) { 
            formdata += entry.getkey() + "=" + entry.getvalue() + "&"; 
          } 
          formdata = formdata.substring(0, formdata.length() - 1); 
          out.write(formdata.tostring().getbytes(requestencoding)); 
        } 
      } else { 
        string boundary = "-----------------------------" + string.valueof(new date().gettime()); 
        connection.setrequestproperty("content-type", "multipart/form-data; boundary=" + boundary); 
        out = new dataoutputstream(connection.getoutputstream()); 
        if (formtexts != null && formtexts.size() > 0) { 
          stringbuilder sbformdata = new stringbuilder(); 
          for (entry<string, string> entry : formtexts.entryset()) { 
            sbformdata.append("--" + boundary + "\r\n"); 
            sbformdata.append("content-disposition: form-data; name=\"" + entry.getkey() + "\"\r\n\r\n"); 
            sbformdata.append(entry.getvalue() + "\r\n"); 
          } 
          out.write(sbformdata.tostring().getbytes(requestencoding)); 
        } 
        for (entry<string, string> entry : files.entryset()) { 
          string filename = entry.getkey(); 
          string filepath = entry.getvalue(); 
          if (filename == null || filename.isempty() || filepath == null || filepath.isempty()) { 
            continue; 
          } 
          file file = new file(filepath); 
          if (!file.exists()) { 
            continue; 
          } 
          out.write(("--" + boundary + "\r\n").getbytes(requestencoding)); 
          out.write(("content-disposition: form-data; name=\"" + filename + "\"; filename=\"" + file.getname() + "\"\r\n").getbytes(requestencoding)); 
          out.write(("content-type: application/x-msdownload\r\n\r\n").getbytes(requestencoding)); 
          datainputstream in = new datainputstream(new fileinputstream(file)); 
          int bytes = 0; 
          byte[] bufferout = new byte[1024]; 
          while ((bytes = in.read(bufferout)) != -1) { 
            out.write(bufferout, 0, bytes); 
          } 
          in.close(); 
          out.write(("\r\n").getbytes(requestencoding)); 
        } 
        out.write(("--" + boundary + "--").getbytes(requestencoding)); 
      } 
      out.flush(); 
      out.close(); 
      out = null; 
      reader = new bufferedreader(new inputstreamreader(connection.getinputstream(), responseencoding)); 
      string line; 
      while ((line = reader.readline()) != null) { 
        result += line; 
      } 
    } catch (exception e) { 
      system.out.println("发送post请求出现异常！"); 
      e.printstacktrace(); 
    } finally { 
      try { 
        if (out != null) { 
          out.close(); 
        } 
        if (reader != null) { 
          reader.close(); 
        } 
      } catch (ioexception ex) { 
        ex.printstacktrace(); 
      } 
    } 
    return result; 
  } 
} 

以上所述是小编给大家介绍的java 发送http请求上传文件功能实例，希望对大家有所帮助