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: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:
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:
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
- /**
- * 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;
- }
/**
* 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:
- 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();
- }
- }
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();
}
}
- //下面是返回執行結果
- //下面是返回執行結果
//下面是返回執行結果
- 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;
msu.responseToAS(response, bl);
System.out.println("接收申請處理完畢,狀態:" + bl);
return null;
- //msu.responseToAS
- //msu.responseToAS
//msu.responseToAS
- 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");
- }
- }