org.apache.commons.httpclient.HttpClient hc = new
????? org.apache.commons.httpclient.HttpClient();
? hc.getHostConfiguration().setHost("localhost", 80);
? org.apache.commons.httpclient.methods.MultipartPostMethod mpm = new
????? org.apache.commons.httpclient.methods.MultipartPostMethod("/upload.asp");
? mpm.addParameter("username", "username");
? mpm.addParameter("file1", "文件名.txt", new java.io.File("c://boot.ini"));
? mpm.addParameter("file2", "再來一個文件.txt", new java.io.File("c://boot.ini"));
? hc.executeMethod(mpm);
? System.out.println(mpm.getResponseBodyAsString());
org.apache.commons.httpclient.HttpClient hc = new
????? org.apache.commons.httpclient.HttpClient();
? hc.getHostConfiguration().setHost("localhost", 80);
? org.apache.commons.httpclient.methods.MultipartPostMethod mpm = new
????? org.apache.commons.httpclient.methods.MultipartPostMethod("/upload.asp");
? mpm.addParameter("username", "username");
? mpm.addParameter("file1", "文件名.txt", new java.io.File("c://boot.ini"));
? mpm.addParameter("file2", "再來一個文件.txt", new java.io.File("c://boot.ini"));
? hc.executeMethod(mpm);
? System.out.println(mpm.getResponseBodyAsString());

package ?com.test;

import ?org.apache.commons.httpclient.Cookie;
import ?org.apache.commons.httpclient.HttpClient;
import ?org.apache.commons.httpclient.NameValuePair;
import ?org.apache.commons.httpclient.cookie.CookiePolicy;
import ?org.apache.commons.httpclient.cookie.CookieSpec;
import ?org.apache.commons.httpclient.methods.GetMethod;
import ?org.apache.commons.httpclient.methods.PostMethod;

public ? class ?FormLoginDemo? {
? static ? final ?String?LOGON_STR? = ? " localhost " ;
? static ? final ? int ?LOGON_PORT? = ? 8080 ;
?
? public ? static ? void ?main(String[]?args)? throws ?Exception {
??HttpClient?client? = ? new ?HttpClient();
??
??client.getHostConfiguration().setHost(LOGON_STR,?LOGON_PORT);
??
// ???模擬登錄頁面login.jsp->main.jsp
??PostMethod?post? = ? new ?PostMethod( " /a.jsp " );
??NameValuePair?name? = ? new ?NameValuePair( " name " ,? " Id " );
??NameValuePair?pass? = ? new ?NameValuePair( " password " ?,? " Id " );
??
??post.setRequestBody( new ?NameValuePair[] {name,?pass} );
??
?? int ?status? = ?client.executeMethod(post);
??
??System.out.println(post.getResponseBodyAsString());
??post.releaseConnection();
??
?? // 查看cookie?信息
??CookieSpec?cookiespec? = ?CookiePolicy.getDefaultSpec();
??Cookie[]?cookies? = ?cookiespec.match(LOGON_STR,?LOGON_PORT,? " / " ,? false ,?client.getState().getCookies());
??
?? if ?(cookies.length? == ? 0 ) {
???System.out.println( " none " );
??} else {
??? for ?( int ?i? = ? 0 ;?i < ?cookies.length;?i ++ ) {
????System.out.println(cookies[i].toString());
???}
??}
??
?? // 訪問所需的頁面main2.jsp
??GetMethod?get? = ? new ?GetMethod( " /b.jsp " );
??client.executeMethod(get);
??System.out.println(get.getResponseBodyAsString());
??get.releaseConnection();
??
?}
}
?

針對采用HttpClient 文件上傳 的其實和一般上傳一樣，將文件以流的形式作為請求的信息RequestBody 體即可

必須注意中文問題：

關于httpclient上傳文件是中文名稱的處理

在一個項目中,上傳文件采用httpclient來post文件,在測試中發現如果文件是中文名稱,上傳的文件是亂碼
經過跟蹤發現,原來在httpclient中進行了編碼,為ASCII,所以為亂碼
org\apache\commons\httpclient\util包下EncodingUtil.Java

/**
*ConvertsthespecifiedstringtobytearrayofASCIIcharacters.
*
*@paramdatathestringtobeencoded
*@returnThestringasabytearray.
*
*@since3.0
*/
publicstaticbyte[]getAsciiBytes(finalStringdata){

if(data==null){
thrownewIllegalArgumentException("Parametermaynotbenull");
}

http://www.mscto.com

?

try{
returndata.getBytes("US-ASCII");
}catch(UnsupportedEncodingExceptione){
thrownewHttpClientError("HttpClientrequiresASCIIsupport");
}
}

解決方法:
1在接收端處理ascii數據
2重新編譯httpclient包,即更改上面的方法,改為iso8859-1或utf-8
這樣可以解決中文的問題

采用httpclient是一個很好的方法,可以給你其他的系統post數據,好像Delphi中的indy控件,

httpclient上傳文件使用