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：
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;
importjava.net.HttpURLConnection;
importjava.net.URL;
importjava.net.URLConnection;
importjava.util.Date;
importjava.util.Map;
importjava.util.Map.Entry;
publicclassHttpRequestUtil{
/**
*发送get请求
*
*@paramrequestUrl
*请求url
*@paramrequestHeader
*请求头
*@paramresponseEncoding
*响应编码
*@return页面响应html
*/
publicstaticStringsendGet(StringrequestUrl,MaprequestHeader,StringresponseEncoding){
Stringresult="";
BufferedReaderreader=null;
try{
if(requestUrl==null||requestUrl.isEmpty()){
returnresult;
}
URLrealUrl=newURL(requestUrl);
URLConnectionconnection=realUrl.openConnection();
connection.setRequestProperty("accept","text/html,application/xhtml+xml,image/jxr,*/*");
connection.setRequestProperty("user-agent","Mozilla/5.0(WindowsNT10.0;WOW64;rv:53.0)Gecko/20100101Firefox/53.0");
if(requestHeader!=null&&requestHeader.size()>0){
for(Entryentry:requestHeader.entrySet()){
connection.setRequestProperty(entry.getKey(),entry.getValue());
}
}
connection.connect();
if(responseEncoding==null||responseEncoding.isEmpty()){
responseEncoding="UTF-8";
}
reader=newBufferedReader(newInputStreamReader(connection.getInputStream(),responseEncoding));
Stringline;
while((line=reader.readLine())!=null){
result+=line;
}
}catch(Exceptione){
System.out.println("发送GET请求出现异常！");
e.printStackTrace();
}finally{
try{
if(reader!=null){
reader.close();
}
}catch(Exceptione){
e.printStackTrace();
}
}
returnresult;
}
/**
*发送post请求
*
*@paramrequestUrl
*请求url
*@paramrequestHeader
*请求头
*@paramformTexts
*表单数据
*@paramfiles
*上传文件
*@paramrequestEncoding
*请求编码
*@paramresponseEncoding
*响应编码
*@return页面响应html
*/
publicstaticStringsendPost(StringrequestUrl,MaprequestHeader,MapformTexts,Mapfiles,StringrequestEncoding,StringresponseEncoding){
OutputStreamout=null;
BufferedReaderreader=null;
Stringresult="";
try{
if(requestUrl==null||requestUrl.isEmpty()){
returnresult;
}
URLrealUrl=newURL(requestUrl);
HttpURLConnectionconnection=(HttpURLConnection)realUrl.openConnection();
connection.setRequestProperty("accept","text/html,application/xhtml+xml,image/jxr,*/*");
connection.setRequestProperty("user-agent","Mozilla/5.0(WindowsNT10.0;WOW64;rv:53.0)Gecko/20100101Firefox/53.0");
if(requestHeader!=null&&requestHeader.size()>0){
for(Entryentry: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(Entryentry:requestHeader.entrySet()){
connection.setRequestProperty(entry.getKey(),entry.getValue());
}
}
if(files==null||files.size()==0){
connection.setRequestProperty("content-type","application/x-www-form-urlencoded");
out=newDataOutputStream(connection.getOutputStream());
if(formTexts!=null&&formTexts.size()>0){
StringformData="";
for(Entryentry:formTexts.entrySet()){
formData+=entry.getKey()+"="+entry.getValue()+"&";
}
formData=formData.substring(0,formData.length()-1);
out.write(formData.toString().getBytes(requestEncoding));
}
}else{
Stringboundary="-----------------------------"+String.valueOf(newDate().getTime());
connection.setRequestProperty("content-type","multipart/form-data;boundary="+boundary);
out=newDataOutputStream(connection.getOutputStream());
if(formTexts!=null&&formTexts.size()>0){
StringBuildersbFormData=newStringBuilder();
for(Entryentry: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(Entryentry:files.entrySet()){
StringfileName=entry.getKey();
StringfilePath=entry.getValue();
if(fileName==null||fileName.isEmpty()||filePath==null||filePath.isEmpty()){
continue;
}
Filefile=newFile(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));
DataInputStreamin=newDataInputStream(newFileInputStream(file));
intbytes=0;
byte[]bufferOut=newbyte[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=newBufferedReader(newInputStreamReader(connection.getInputStream(),responseEncoding));
Stringline;
while((line=reader.readLine())!=null){
result+=line;
}
}catch(Exceptione){
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(IOExceptionex){
ex.printStackTrace();
}
}
returnresult;
}
}
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，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持！