Java 发送http请求上传文件功能案例

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概括代码如下所示：

packagewxapi.WxHelper;

importjava.io.BufferedReader;

importjava.io.DataInputStream;

importjava.io.DataOutputStream;

importjava.io.File;

importjava.io.FileInputStream;

importjava.io.IOException;

importjava.io.InputStreamReader;

importjava.io.OutputStream;

import.HttpURLConnection;

import.URL;

import.URLConnection;

importjava.util.Date;

importjava.util.Map;

importjava.util.Map.Entry;

publicclassHttpRequestUtil

/**

*发送get苦求

*

*@paramrequestUrl

*苦求url

*@paramrequestHeader

*苦求头

*@paramresponseEncoding

*响应编码

*@return页面响应html

*/

publicstaticStringsendGetStringrequestUrl,MapString,StringrequestHeader,StringresponseEncoding

Stringresult=;

BufferedReaderreader=null;

try

ifrequestUrl==null||requestUrl.isEmpty

returnresult;

URLrealUrl=newURLrequestUrl;

URLConnectionconnection=realUrl.openConnection;

connection.setRequestPropertyaccept,text/html,application/xhtml+xml,image/jxr,*/*;

connection.setRequestPropertyuser-agent,Mozilla/5.0WindowsNT10.0;WOW64;rv:53.0Gecko/20220101Firefox/53.0;

ifrequestHeader!=nullrequestHeader.size0

forEntryString,Stringentry:requestHeader.entrySet

connection.setRequestPropertyentry.getKey,entry.getValue;

connection.connect;

ifresponseEncoding==null||responseEncoding.isEmpty

responseEncoding=UTF-8;

reader=newBufferedReadernewInputStreamReaderconnection.getInputStream,responseEncoding;

Stringline;

whileline=reader.readLine!=null

result+=line;

catchExceptione

System.out.println发送GET苦求展现奇怪！;

e.printStackTrace;

finally

try

ifreader!=null

reader.close;

catchExceptione

e.printStackTrace;

returnresult;

/**

*发送post苦求

*

*@paramrequestUrl

*苦求url

*@paramrequestHeader

*苦求头

*@paramformTexts

*表单数据

*@paramfiles

*上传文件

*@paramrequestEncoding

*苦求编码

*@paramresponseEncoding

*响应编码

*@return页面响应html

*/

publicstaticStringsendPostStringrequestUrl,MapString,StringrequestHeader,MapString,StringformTexts,MapString,Stringfiles,StringrequestEncoding,StringresponseEncoding

OutputStreamout=null;

BufferedReaderreader=null;

Stringresult=;

try

ifrequestUrl==null||requestUrl.isEmpty

returnresult;

URLrealUrl=newURLrequestUrl;

HttpURLConnectionconnection=HttpURLConnectionrealUrl.openConnection;

connection.setRequestPropertyaccept,text/html,application/xhtml+xml,image/jxr,*/*;

connection.setRequestPropertyuser-agent,Mozilla/5.0WindowsNT10.0;WOW64;rv:53.0Gecko/20220101Firefox/53.0;

ifrequestHeader!=nullrequestHeader.size0

forEntryString,Stringentry:requestHeader.entrySet

connection.setRequestPropertyentry.getKey,entry.getValue;

connection.setDoOutputtrue;

connection.setDoInputtrue;

connection.setRequestMethodPOST;

ifrequestEncoding==null||requestEncoding.isEmpty

requestEncoding=UTF-8;

ifresponseEncoding==null||responseEncoding.isEmpty

responseEncoding=UTF-8;

ifrequestHeader!=nullrequestHeader.size0

forEntryString,Stringentry:requestHeader.entrySet

connection.setRequestPropertyentry.getKey,entry.getValue;

iffiles==null||files.size==0

connection.setRequestPropertycontent-type,application/x--form-urlencoded;

out=newDataOutputStreamconnection.getOutputStream;

ifformTexts!=nullformTexts.size0

StringformData=;

forEntryString,Stringentry:formTexts.entrySet

formData+=entry.getKey+=+entry.getValue+;

formData=formData.substring0,formData.length-1;

out.writeformData.toString.getBytesrequestEncoding;

else

Stringboundary=+String.valueOfnewDate.getTime;

connection.setRequestPropertycontent-type,multipart/form-data;boundary=+boundary;

out=newDataOutputStreamconnection.getOutputStream;

ifformTexts!=nullformTexts.size0

StringBuildersbFormData=newStringBuilder;

forEntryString,Stringentry:formTexts.entrySet

sbFormData.append--+boundary+\r\n;

sbFormData.appendContent-Disposition:form-data;name=\+entry.getKey+\\r\n\r\n;

sbFormData.appendentry.getValue+\r\n;

out.writesbFormData.toString.getBytesrequestEncoding;

forEntryString,Stringentry:files.entrySet

StringfileName=entry.getKey;

StringfilePath=entry.getValue;

iffileName==null||fileName.isEmpty||filePath==null||filePath.isEmpty

continue;

Filefile=newFilefilePath;

if!file.exists

continue;

out.write--+boundary+\r\n.getBytesrequestEncoding;

out.writeContent-Disposition:form-data;name=\+fileName+\;filename=\+file.getName+\\r\n.getBytesrequestEncoding;

out.writeContent-Type:application/x-msdownload\r\n\r\n.getBytesrequestEncoding;

DataInputStreamin=newDataInputStreamnewFileInputStreamfile;

intbytes=0;

byte[]bufferOut=newbyte[1024];

whilebytes=in.readbufferOut!=-1

out.writebuf