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HttpClient通过Post上传文件的实例代码

2019年07月24日  | 移动技术网移动技术  | 我要评论

在之前一段的项目中，使用java模仿http post方式发送参数以及文件，单纯的传递参数或者文件可以使用urlconnection进行相应的处理。

但是项目中涉及到既要传递普通参数，也要传递多个文件（不是单纯的传递xml文件）。在网上寻找之后，发现是使用httclient来进行响应的操作，起初尝试多次依然不能传递参数和传递文件，后来发现时因为当使用httpclient时，不能使用request.getparameter()对普通参数进行获取，而要在服务器端使用upload来进行操作。

httpclient4.2 jar下载 ：

客户端代码：

import java.io.bytearrayoutputstream; 
import java.io.file; 
import java.io.ioexception; 
import java.io.inputstream; 
import org.apache.http.httpentity; 
import org.apache.http.httpresponse; 
import org.apache.http.httpstatus; 
import org.apache.http.parseexception; 
import org.apache.http.client.httpclient; 
import org.apache.http.client.methods.httppost; 
import org.apache.http.entity.mime.multipartentity; 
import org.apache.http.entity.mime.content.filebody; 
import org.apache.http.impl.client.defaulthttpclient; 
import org.apache.http.util.entityutils; 
/** 
* 
* @author <a href="mailto:just_szl@hotmail.com"> geray</a> 
* @version 1.0,2012-6-12 
*/ 
public class httppostargumenttest2 { 
//file1与file2在同一个文件夹下 filepath是该文件夹指定的路径 
public void submitpost(string url,string filename1,string filename2, string filepath){ 
httpclient httpclient = new defaulthttpclient(); 
try { 
httppost httppost = new httppost(url); 
filebody bin = new filebody(new file(filepath + file.separator + filename1)); 
filebody bin2 = new filebody(new file(filepath + file.separator + filename2)); 
stringbody comment = new stringbody(filename1); 
multipartentity reqentity = new multipartentity(); 
reqentity.addpart("file1", bin);//file1为请求后台的file upload;属性 
reqentity.addpart("file2", bin2);//file2为请求后台的file upload;属性 
reqentity.addpart("filename1", comment);//filename1为请求后台的普通参数;属性 
httppost.setentity(reqentity); 
httpresponse response = httpclient.execute(httppost); 
int statuscode = response.getstatusline().getstatuscode(); 
if(statuscode == httpstatus.sc_ok){ 
system.out.println("服务器正常响应....."); 
httpentity resentity = response.getentity(); 
system.out.println(entityutils.tostring(resentity));//httpclient自带的工具类读取返回数据 
system.out.println(resentity.getcontent()); 
entityutils.consume(resentity); 
} 
} catch (parseexception e) { 
// todo auto-generated catch block 
e.printstacktrace(); 
} catch (ioexception e) { 
// todo auto-generated catch block 
e.printstacktrace(); 
} finally { 
try { 
httpclient.getconnectionmanager().shutdown(); 
} catch (exception ignore) { 
} 
} 
} 
/** 
* @param args 
*/ 
public static void main(string[] args) { 
// todo auto-generated method stub 
httppostargumenttest2 httppostargumenttest2 = new httppostargumenttest2(); 
httppostargumenttest2.submitpost("http://127.0.0.1:8080/demo/receivedata.do", 
"test.xml","test.zip","d://test"); 
} 
}

服务端代码：

public void receivedata(httpservletrequest request, httpservletresponse response) throws appexception{ 
printwriter out = null; 
response.setcontenttype("text/html;charset=utf-8"); 
map map = new hashmap(); 
fileitemfactory factory = new diskfileitemfactory(); 
servletfileupload upload = new servletfileupload(factory); 
file directory = null; 
list<fileitem> items = new arraylist(); 
try { 
items = upload.parserequest(request); 
// 得到所有的文件 
iterator<fileitem> it = items.iterator(); 
while (it.hasnext()) { 
fileitem fitem = (fileitem) it.next(); 
string fname = ""; 
object fvalue = null; 
if (fitem.isformfield()) { // 普通文本框的值 
fname = fitem.getfieldname(); 
// fvalue = fitem.getstring(); 
fvalue = fitem.getstring("utf-8"); 
map.put(fname, fvalue); 
} else { // 获取上传文件的值 
fname = fitem.getfieldname(); 
fvalue = fitem.getinputstream(); 
map.put(fname, fvalue); 
string name = fitem.getname(); 
if(name != null && !("".equals(name))) { 
name = name.substring(name.lastindexof(file.separator) + 1); 
// string stamp = stringutils.getformattedcurrdatenumberstring(); 
string timestamp_str = timeutils.getcurryearyyyy(); 
directory = new file("d://test"); 
directory.mkdirs(); 
string filepath = ("d://test")+ timestamp_str+ file.separator + name; 
map.put(fname + "filepath", filepath); 
inputstream is = fitem.getinputstream(); 
fileoutputstream fos = new fileoutputstream(filepath); 
byte[] buffer = new byte[1024]; 
while (is.read(buffer) > 0) { 
fos.write(buffer, 0, buffer.length); 
} 
fos.flush(); 
fos.close(); 
map.put(fname + "filename", name); 
} 
} 
} 
} catch (exception e) { 
system.out.println("读取http请求属性值出错!"); 
// e.printstacktrace(); 
logger.error("读取http请求属性值出错"); 
} 
// 数据处理 
try { 
out = response.getwriter(); 
out.print("{success:true, msg:'接收成功'}"); 
out.close(); 
} catch (ioexception e) { 
e.printstacktrace(); 
} 
}

以上所述是小编给大家介绍的httpclient通过post上传文件的实例代码，希望对大家有所帮助

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