httpclient 上傳文件

akarta的httpclient3.1是最新版本，項目中需要用程序模擬瀏覽器的GET和POST動作。在使用過程中遇到不少問題。
1. 帶附件的POST提交
最開始都是使用MultipartPostMethod這個類，現在已經廢棄這個類了。API說明：Deprecated. Use MultipartRequestEntity in conjunction with PostMethod instead. 使用PostMethod可以實現的功能，就沒有必要再弄一個MultipartPostMethod了。下面是一段最簡單的示例：

PostMethod post = new PostMethod();

NameValuePair[] pairs = new NameValuePair[2];

pairs[0] = new NameValuePair("para1", "value1");

pairs[0] = new NameValuePair("para2", "value2");

post.setRequestBody(pairs);

HttpClient client = new HttpClient();

try

{

client.executeMethod(post);

} catch (HttpException e)

{

e.printStackTrace();

} catch (IOException e)

{

e.printStackTrace();

}

這是針對一般的form形式的提交，而且這個form裏面不帶附件的。如果帶附件，那麼這種方法就不起作用，附件上傳的參數和普通參數無法一同在服務器獲取到。org.apache.commons.httpclient.methods.multipart 這個包就是爲處理文件上傳這種多形式參數的情況的。最主要的類是Part（代表一種post object），它有二個比較重要的子類：FilePart和StringPart，一個是文件的參數，另一個就是普通的文本參數。它的典型使用方法如下：

String url = "http://localhost:8080/HttpTest/Test";

PostMethod postMethod = new PostMethod(url);

StringPart sp = new StringPart("TEXT", "testValue");

FilePart fp = new FilePart("file", "test.txt", new File("./temp/test.txt"));

MultipartRequestEntity mrp= new MultipartRequestEntity(new Part[]

{sp, fp}, postMethod

.getParams());

postMethod.setRequestEntity(mrp);

//執行postMethod

HttpClient httpClient = new HttpClient();

try

{

httpClient.executeMethod(postMethod);

} catch (HttpException e)

{

e.printStackTrace();

} catch (IOException e)

{

e.printStackTrace();

}

在第二行PostMethod postMethod = new PostMethod();後面，有人說需要使用postMehtod.setRequestHeader("Content-type", "multipart/form-data"); Content-type的請求類型進行更改。但是我在使用過程沒有加上這一句，查了一下httpCleint的默認Content-type是application/octet-stream。應該是沒有影響的。對於MIME類型的請求，httpclient建議全用MulitPartRequestEntity進行包裝，就是上面的用法。

2. 參數中文的處理問題
httpclient的默認編碼都是ISO-8859-1，那肯定就無法支持中文參數了。引用一下這篇文章：http://thinkbase.net/w/main/Wiki?HttpClient+POST+%E7%9A%84+UTF-8+%E7%BC%96%E7%A0%81%E9%97%AE%E9%A2%98，按照作者的說法，就可以正常解決中文編碼的問題。其中最關鍵的是修改EncodingUtil這個類的一個方法實現。另外，FilePart和StringPart的構造方法都有一個帶編碼指定的參數，爲了減少問題的出現，建議所有的都帶上統一的編碼，包括postMethod.getParams()。示例如下：

String url = "http://localhost:8080/HttpTest/Test";

PostMethod postMethod = new PostMethod(url);

StringPart sp = new StringPart("TEXT", "testValue", "GB2312");

FilePart fp = new FilePart("file", "test.txt", new File("./temp/test.txt"), null, "GB2312");

postMethod.getParams().setContentCharset("GB2312");

MultipartRequestEntity mrp= new MultipartRequestEntity(new Part[]

{sp, fp}, postMethod

.getParams());

postMethod.setRequestEntity(mrp);

//執行postMethod

HttpClient httpClient = new HttpClient();

try

{

httpClient.executeMethod(postMethod);

} catch (HttpException e)

{

e.printStackTrace();

} catch (IOException e)

{

e.printStackTrace();

}

httpclient筆記（二）

不多說了，直接上示例：

A服務器：

msURL爲：http://192.168.7.203:8080

Java代碼

/**
* 發送文件到另一臺服務器B
*
* @param File file 附件
* @param serviceType服務類型
* @param spId id
* @return
*/
public String sendApply(File file, String serviceType, String spId) {
String fromAgentResult = "";
HttpClient client = new HttpClient();
PostMethod filePost = new PostMethod(msUrl+"?serviceType="+serviceType+"&spId="+spId+"&type=menu");
// MultipartPostMethod filePost = new MultipartPostMethod(msUrl);
// 若上傳的文件比較大 , 可在此設置最大的連接超時時間
client.getHttpConnectionManager(). getParams().setConnectionTimeout(8000);
try {
FilePart fp = new FilePart(file.getName(), file);
MultipartRequestEntity mrp= new MultipartRequestEntity(new Part[]{fp}, filePost.getParams());
filePost.setRequestEntity(mrp);
//使用系統提供的默認的恢復策略
filePost.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
new DefaultHttpMethodRetryHandler());
int httpStat = client.executeMethod(filePost);
System.out.println("httpStat----"+httpStat);
if (!(httpStat == HttpStatus.SC_OK)) {
fromAgentResult = "connected fail:" + httpStat;
} else if (httpStat == HttpStatus.SC_OK) {
try {
DocumentBuilderFactory factory = DocumentBuilderFactory
.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder
.parse(filePost.getResponseBodyAsStream());
doc.normalize();
// NodeList optypeNL= doc.getElementsByTagName("optype");
NodeList resultNL = doc.getElementsByTagName("result");
// fromAgentOptype=
// optypeNL.item(0).getFirstChild().getNodeValue();
fromAgentResult = resultNL.item(0).getFirstChild()
.getNodeValue();
System.out.println("發送請求完畢，接收狀態："+fromAgentResult);
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (HttpException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
filePost.releaseConnection();
return fromAgentResult;
}

[java] view plain copy print ?

/**
* 發送文件到另一臺服務器B
*
* @param File file 附件
* @param serviceType服務類型
* @param spId id
* @return
*/
public String sendApply(File file, String serviceType, String spId) {
String fromAgentResult = "";
HttpClient client = new HttpClient();
PostMethod filePost = new PostMethod(msUrl+"?serviceType="+serviceType+"&spId="+spId+"&type=menu");
// MultipartPostMethod filePost = new MultipartPostMethod(msUrl);
// 若上傳的文件比較大 , 可在此設置最大的連接超時時間
client.getHttpConnectionManager(). getParams().setConnectionTimeout(8000);
try {
FilePart fp = new FilePart(file.getName(), file);
MultipartRequestEntity mrp= new MultipartRequestEntity(new Part[]{fp}, filePost.getParams());
filePost.setRequestEntity(mrp);
//使用系統提供的默認的恢復策略
filePost.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
new DefaultHttpMethodRetryHandler());
int httpStat = client.executeMethod(filePost);
System.out.println("httpStat----"+httpStat);
if (!(httpStat == HttpStatus.SC_OK)) {
fromAgentResult = "connected fail:" + httpStat;
} else if (httpStat == HttpStatus.SC_OK) {
try {
DocumentBuilderFactory factory = DocumentBuilderFactory
.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder
.parse(filePost.getResponseBodyAsStream());
doc.normalize();
// NodeList optypeNL= doc.getElementsByTagName("optype");
NodeList resultNL = doc.getElementsByTagName("result");
// fromAgentOptype=
// optypeNL.item(0).getFirstChild().getNodeValue();
fromAgentResult = resultNL.item(0).getFirstChild()
.getNodeValue();
System.out.println("發送請求完畢，接收狀態："+fromAgentResult);
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (HttpException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
filePost.releaseConnection();
return fromAgentResult;
}

/**
	 * 發送文件到另一臺服務器B
	 * 
	 * @param File file 附件
	 * @param serviceType服務類型
	 * @param spId id
	 * @return
	 */
	public String sendApply(File file, String serviceType, String spId) {
		String fromAgentResult = "";
		HttpClient client = new HttpClient();
		PostMethod filePost = new PostMethod(msUrl+"?serviceType="+serviceType+"&spId="+spId+"&type=menu");
//		 MultipartPostMethod filePost = new MultipartPostMethod(msUrl);
		// 若上傳的文件比較大 , 可在此設置最大的連接超時時間 
		 client.getHttpConnectionManager(). getParams().setConnectionTimeout(8000);  

		try {

			FilePart fp = new FilePart(file.getName(), file);
			MultipartRequestEntity mrp= new MultipartRequestEntity(new Part[]{fp}, filePost.getParams());
			filePost.setRequestEntity(mrp);

			//使用系統提供的默認的恢復策略
			filePost.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
			    new DefaultHttpMethodRetryHandler());

			int httpStat = client.executeMethod(filePost);
			System.out.println("httpStat----"+httpStat);
			if (!(httpStat == HttpStatus.SC_OK)) {
				fromAgentResult = "connected fail:" + httpStat;
			} else if (httpStat == HttpStatus.SC_OK) {
				
				try {
					DocumentBuilderFactory factory = DocumentBuilderFactory
							.newInstance();
					DocumentBuilder builder = factory.newDocumentBuilder();
					Document doc = builder
							.parse(filePost.getResponseBodyAsStream());
					doc.normalize();
					// NodeList optypeNL= doc.getElementsByTagName("optype");
					NodeList resultNL = doc.getElementsByTagName("result");
					// fromAgentOptype=
					// optypeNL.item(0).getFirstChild().getNodeValue();
					fromAgentResult = resultNL.item(0).getFirstChild()
							.getNodeValue();
					System.out.println("發送請求完畢，接收狀態："+fromAgentResult);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		} catch (HttpException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		filePost.releaseConnection();
		return fromAgentResult;
	}

B服務器接收：

Java代碼

boolean bl = false;
System.out.println("接收文件開始--------------");
String serviceType = request.getParameter("serviceType");
String spId = request.getParameter("spId");
String type = request.getParameter("type");
if (type.equals("menu")) {
DiskFileUpload fu = new DiskFileUpload();
fu.setSizeMax(1000000);
List fileItems;
try {
fileItems = fu.parseRequest(request);
Iterator itr = fileItems.iterator();
while (itr.hasNext()) {
FileItem fi = (FileItem) itr.next();
if (!fi.isFormField()) {
System.out.println("/nNAME: " + fi.getName());
System.out.println("SIZE: " + fi.getSize());
try {
String newFileName = msu.updateName(Integer
.parseInt(serviceType), spId);
System.out.println("newFileName---------------"
+ newFileName);
File fNew = new File(applyFilePath, newFileName);
fi.write(fNew);
bl = msu.acceptApply(Integer.parseInt(serviceType),
spId, newFileName);
System.out.println(fNew.getAbsolutePath());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
System.out.println("Field =" + fi.getFieldName());
}
}
} catch (FileUploadException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}

[java] view plain copy print ?

boolean bl = false;
System.out.println("接收文件開始--------------");
String serviceType = request.getParameter("serviceType");
String spId = request.getParameter("spId");
String type = request.getParameter("type");
if (type.equals("menu")) {
DiskFileUpload fu = new DiskFileUpload();
fu.setSizeMax(1000000);
List fileItems;
try {
fileItems = fu.parseRequest(request);
Iterator itr = fileItems.iterator();
while (itr.hasNext()) {
FileItem fi = (FileItem) itr.next();
if (!fi.isFormField()) {
System.out.println("/nNAME: " + fi.getName());
System.out.println("SIZE: " + fi.getSize());
try {
String newFileName = msu.updateName(Integer
.parseInt(serviceType), spId);
System.out.println("newFileName---------------"
+ newFileName);
File fNew = new File(applyFilePath, newFileName);
fi.write(fNew);
bl = msu.acceptApply(Integer.parseInt(serviceType),
spId, newFileName);
System.out.println(fNew.getAbsolutePath());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
System.out.println("Field =" + fi.getFieldName());
}
}
} catch (FileUploadException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}

	boolean bl = false;
		System.out.println("接收文件開始--------------");
		String serviceType = request.getParameter("serviceType");
		String spId = request.getParameter("spId");
		String type = request.getParameter("type");
		if (type.equals("menu")) {

			DiskFileUpload fu = new DiskFileUpload();
			fu.setSizeMax(1000000);

			List fileItems;

			try {
				fileItems = fu.parseRequest(request);
				Iterator itr = fileItems.iterator();
				while (itr.hasNext()) {
					FileItem fi = (FileItem) itr.next();

					if (!fi.isFormField()) {
						System.out.println("/nNAME: " + fi.getName());
						System.out.println("SIZE: " + fi.getSize());
						try {
							String newFileName = msu.updateName(Integer
									.parseInt(serviceType), spId);
							System.out.println("newFileName---------------"
									+ newFileName);
							File fNew = new File(applyFilePath, newFileName);
							fi.write(fNew);
							bl = msu.acceptApply(Integer.parseInt(serviceType),
									spId, newFileName);

							System.out.println(fNew.getAbsolutePath());

						} catch (Exception e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					} else {
						System.out.println("Field =" + fi.getFieldName());
					}
				}

			} catch (FileUploadException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}

Java代碼

//下面是返回執行結果

[java] view plain copy print ?

//下面是返回執行結果

//下面是返回執行結果

Java代碼

msu.responseToAS(response, bl);
System.out.println("接收申請處理完畢，狀態：" + bl);
return null;

[java] view plain copy print ?

msu.responseToAS(response, bl);
System.out.println("接收申請處理完畢，狀態：" + bl);
return null;

  msu.responseToAS(response, bl);
  System.out.println("接收申請處理完畢，狀態：" + bl);
  return null;

Java代碼

//msu.responseToAS

[java] view plain copy print ?

//msu.responseToAS

//msu.responseToAS

Java代碼

public void responseToAS(HttpServletResponse response, boolean synSuccess) {
try {
PrintWriter out = response.getWriter();
if (synSuccess)
out
.println("<?xml version=/"1.0/" encoding=/"UTF-8/"?><root><result>ok</result></root>");
else
out
.println("<?xml version=/"1.0/" encoding=/"UTF-8/"?><root><result>fail</result></root>");
} catch (IOException e) {
e.printStackTrace();
System.out.println("responseToAS--error");
}
}

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