chttpclient文件上傳

1. 如何執行使用webapi HttpClient文件上傳多後

HttpClient c = new HttpClient();
var fileContent = new ByteArrayContent(new byte[100]);
fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = "myFilename.txt"
};

var formData = new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("name", "ali"),
new KeyValuePair<string, string>("title", "ostad")
});

MultipartContent content = new MultipartContent();
content.Add(formData);
content.Add(fileContent);
c.PostAsync(myUrl, content);

2. httpclient上傳文件時，對文件的大小有上限嗎

不清楚， 幫頂，我覺得這個不是關鍵性問題，總有上限的！肯定需要在上傳前檢查一下size type 等。

3. commons-httpclient如何實現文件上傳

在struts2中結合HttpClient進行文件上傳
最近遇到了用httpclient進行上傳文件的問題,下面我就和大家簡單的說一下:
package com.imps.action;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.List;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;
public class TabinfoAction extends BaseAction
{
private File[] myFile;
private String[] myFileFileName;// 文件名
private Integer[] myFileFileSize;// 文件大小
private String[] myFileContentType;// 文件類型

public String uploadPost()
{
String posturl ="http://127.0.0.1:8080/settabimage.aspx";
System.out.println(posturl);
String status=null;
for(int i=0;i<myFile.length;i++)
{
FileInputStream file=new FileInputStream(myFile[i]);
InputStream in = new BufferedInputStream(file);
PostMethod post=new PostMethod(posturl);
post.setRequestBody(in);
HttpClient client = new HttpClient();
client.executeMethod(post);
String response=new String(post.getResponseBodyAsString().getBytes("ISO-8859-1"),"UTF-8");
post.releaseConnection();
in.close();
file.close();
}
}

public File[] getMyFile() {
return myFile;
}

public void setMyFile(File[] myFile) {
this.myFile = myFile;
}

public String[] getMyFileFileName() {
return myFileFileName;
}

public void setMyFileFileName(String[] myFileFileName) {
this.myFileFileName = myFileFileName;
}

public Integer[] getMyFileFileSize() {
return myFileFileSize;
}

public void setMyFileFileSize(Integer[] myFileFileSize) {
this.myFileFileSize = myFileFileSize;
}

public String[] getMyFileContentType() {
return myFileContentType;
}

public void setMyFileContentType(String[] myFileContentType) {
this.myFileContentType = myFileContentType;
}
千萬記住不要記忘記關閉流和釋放http連接

4. apache httpclient4怎麼實現同時上傳多個文件

1．伺服器認證(Server Authentication)
HttpClient處理伺服器認證幾乎是透明的，僅需要開發人員提供登錄信息(login credentials)。登錄信息保存在HttpState類的實例中，可以通過 setCredentials(String realm, Credentials cred)和getCredentials(String realm)來獲取或設置。
HttpClient內建的自動認證，可以通過HttpMethod類的setDoAuthentication(boolean doAuthentication)方法關閉，而且這次關閉隻影響HttpMethod當前的實例。

2.代理認證(proxy authentication)
除了登錄信息需單獨存放以外，代理認證與伺服器認證幾乎一致。用 setProxyCredentials(String realm, Credentials cred)和 getProxyCredentials(String realm)設、取登錄信息。

3.認證方案(authentication schemes)

是HTTP中規定最早的也是最兼容的方案，遺憾的是也是最不安全的一個方案，因為它以明碼傳送用戶名和密碼。它要求一個UsernamePasswordCredentials實例，可以指定伺服器端的訪問空間或採用默認的登錄信息。

5. httpclient 怎麼實現多文件上傳 c/s java

雖然在JDK的java.net包中已經提供了訪問HTTP協議的基本功能，但是對於大部分應用程序來說，JDK庫本身提供的功能還不夠豐富和靈活。HttpClient是ApacheJakartaCommon下的子項目，用來提供高效的、最新的、功能豐富的支持HTTP協議的客戶端編程工具包，並且它支持HTTP協議最新的版本和建議。以下是簡單的post例子：Stringurl="bbslogin2.php";PostMethodpostMethod=newPostMethod(url);//填入各個表單域的值NameValuePair[]data={newNameValuePair("id","youUserName"),newNameValuePair("passwd","yourPwd")};//將表單的值放入postMethod中postMethod.setRequestBody(data);//執行postMethodintstatusCode=httpClient.executeMethod(postMethod);//HttpClient對於要求接受後繼服務的請求，象POST和PUT等不能自動處理轉發//301或者302if(statusCode==HttpStatus.SC_MOVED_PERMANENTLY||statusCode==HttpStatus.SC_MOVED_TEMPORARILY){//從頭中取出轉向的地址HeaderlocationHeader=postMethod.getResponseHeader("location");Stringlocation=null;if(locationHeader!=null){location=locationHeader.getValue();System.out.println("Thepagewasredirectedto:"+location);}else{System.err.println("Locationfieldvalueisnull.");}return;}詳情見：/developerworks/cn/opensource/os-httpclient/

6. httpclient如何一起上傳內容和圖片

以文件的形式傳參
/**
* 通過拼接的方式構造請求內容，實現參數傳輸以及文件傳輸
*
* @param actionUrl 訪問的伺服器URL
* @param params 普通參數
* @param files 文件參數
* @return
* @throws IOException
*/
public static void post(String actionUrl, Map<String, String> params, Map<String, File> files) throws IOException
{

String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFIX = "--", LINEND = "\r\n";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";

URL uri = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
conn.setReadTimeout(5 * 1000); // 緩存的最長時間
conn.setDoInput(true);// 允許輸入
conn.setDoOutput(true);// 允許輸出
conn.setUseCaches(false); // 不允許使用緩存
conn.setRequestMethod("POST");
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);

// 首先組拼文本類型的參數
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet())
{
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
sb.append(entry.getValue());
sb.append(LINEND);
}

DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
outStream.write(sb.toString().getBytes());
InputStream in = null;
// 發送文件數據
if (files != null)
{
for (Map.Entry<String, File> file : files.entrySet())
{
StringBuilder sb1 = new StringBuilder();
sb1.append(PREFIX);
sb1.append(BOUNDARY);
sb1.append(LINEND);
// name是post中傳參的鍵 filename是文件的名稱
sb1.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + file.getKey() + "\"" + LINEND);
sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);
sb1.append(LINEND);
outStream.write(sb1.toString().getBytes());

InputStream is = new FileInputStream(file.getValue());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1)
{
outStream.write(buffer, 0, len);
}

is.close();
outStream.write(LINEND.getBytes());
}

// 請求結束標志
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
outStream.write(end_data);
outStream.flush();
// 得到響應碼
int res = conn.getResponseCode();
if (res == 200)
{
in = conn.getInputStream();
int ch;
StringBuilder sb2 = new StringBuilder();
while ((ch = in.read()) != -1)
{
sb2.append((char) ch);
}
}
outStream.close();
conn.disconnect();
}
// return in.toString();
}

以數據流的形式傳參
public static String postFile(String actionUrl, Map<String, String> params, Map<String, byte[]> files)
throws Exception
{
StringBuilder sb2 = null;
String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFIX = "--", LINEND = "\r\n";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";

URL uri = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
conn.setReadTimeout(6 * 1000); // 緩存的最長時間
conn.setDoInput(true);// 允許輸入
conn.setDoOutput(true);// 允許輸出
conn.setUseCaches(false); // 不允許使用緩存
conn.setRequestMethod("POST");
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);

// 首先組拼文本類型的參數
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet())
{
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
sb.append(entry.getValue());
sb.append(LINEND);
}

DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
outStream.write(sb.toString().getBytes());
InputStream in = null;
// 發送文件數據
if (files != null)
{
for (Map.Entry<String, byte[]> file : files.entrySet())
{
StringBuilder sb1 = new StringBuilder();
sb1.append(PREFIX);
sb1.append(BOUNDARY);
sb1.append(LINEND);
sb1.append("Content-Disposition: form-data; name=\"pic\"; filename=\"" + file.getKey() + "\"" + LINEND);
sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);
sb1.append(LINEND);
outStream.write(sb1.toString().getBytes());

// InputStream is = new FileInputStream(file.getValue());
// byte[] buffer = new byte[1024];
// int len = 0;
// while ((len = is.read(buffer)) != -1)
// {
// outStream.write(buffer, 0, len);
// }
// is.close();
outStream.write(file.getValue());

outStream.write(LINEND.getBytes());
}

// 請求結束標志
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
outStream.write(end_data);
outStream.flush();
// 得到響應碼
int res = conn.getResponseCode();
if (res == 200)
{
in = conn.getInputStream();
int ch;
sb2 = new StringBuilder();
while ((ch = in.read()) != -1)
{
sb2.append((char) ch);
}
System.out.println(sb2.toString());
}
outStream.close();
conn.disconnect();
// 解析伺服器返回來的數據
return ParseJson.getEditMadIconResult(sb2.toString());
}
else
{
return "Update icon Fail";
}
// return in.toString();
}

7. 使用httpclient實現文件的上傳文件需要哪些包

題主是說哪個版本呢

其實 在apache官網中有下載、也有例子

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8. android的自帶的httpClient 怎麼上傳文件

在Android開發中，Android SDK附帶了Apache的HttpClient，它是一個完善的客戶端。它提供了對HTTP協議的全面支持，可以使用HttpClient的對象來執行HTTP GET和HTTP POST調用。

HTTP工作原理：

1.客戶端(一般是指瀏覽器，這里是指自己寫的程序)與伺服器建立連接

2.建立連接後，客戶端向伺服器發送請求

3.伺服器接收到請求後，向客戶端發送響應信息

4.客戶端與伺服器斷開連接

HttpClient的一般使用步驟：

1.使用DefaultHttpClient類實例化HttpClient對象

2.創建HttpGet或HttpPost對象，將要請求的URL通過構造方法傳入HttpGet或HttpPost對象。

3.調用execute方法發送HTTP GET或HTTP POST請求，並返回HttpResponse對象。

4.通過HttpResponse介面的getEntity方法返回響應信息，並進行相應的處理。

最後記得要在AndroidManifest.xml文件添加網路許可權

<uses-permission android:name="android.permission.INTERNET" />

附件中包含了一個拍照上傳的源代碼