httpclient 针对文件和流的处理


http://www.cnblogs.com/chinareny2k/archive/2010/03/22/1691624.html

http://hi.baidu.com/846492130/item/b2c0ab71cdd2844cee1e5386




httpclient模拟form表单/post提交文件

该方法需要的jar包 commons-codec-1.4.jar       commons-httpclient-3.1.jar           commons-logging-1.1.1.jar

以上各包 均可在apache上下载 或 用maven 下载

 

File f = new File("device1.png");
PostMethod filePost = new PostMethod(
        "
Part[] parts = { new FilePart("filename", f) ,new StringPart("name1","value"),new StringPart("name2","value","")};
filePost.setRequestEntity(new MultipartRequestEntity(parts, filePost
        .getParams()));
HttpClient clients = new HttpClient();

int status = clients.executeMethod(filePost);
try {
    BufferedReader rd = new BufferedReader(new InputStreamReader(
            filePost.getResponseBodyAsStream(), "UTF-8"));
    StringBuffer stringBuffer = new StringBuffer();
    String line;
    while ((line = rd.readLine()) != null) {
        stringBuffer .append(line);
    }
    rd.close();
    System.out.println("接受到的流是：" + stringBuffer + "—-" + status);
} catch (Exception e) {
    throw new RuntimeException("error”,e);

}

--------------------------------------------分割线----------------------------------------------------------

上面的代码模拟的表单为

<form enctype="multipart/form-data" action=http://url/path  method="POST">

<input type="file" name="filename"/>

<input type="text" name="name1"/>

<input type="text" name="name2"/>

<input type="submit"/>

</form>

===========================================================================================================================================

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

 

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.InputStreamEntity;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.params.HttpConnectionParams;

 

/**

  * Example how to use unbuffered chunk-encoded POST request.

  */

public class ClientChunkEncodedPost {

 

     public static void main(String[] args) throws Exception {

         if (args.length != 1 )  {

             System.out.println( "File path not given" );

             System.exit( 1 );

         }

         HttpClient httpclient = new DefaultHttpClient();

 

//        HttpPost httppost = new HttpPost("http://localhost:8088" +

//                "/client/test.jsp?username=用户&password=秘密");

//        HttpPost httppost = new HttpPost("http://localhost:8088/struts2/SendXmlServlet");

         HttpPost httppost = new HttpPost( "http://localhost:8088/struts2/StringServlet" );

         File file = new File(args[ 0 ]);

         InputStreamEntity reqEntity = new InputStreamEntity(

                 new FileInputStream(file), - 1 );

         reqEntity.setContentType( "binary/octet-stream" );

         reqEntity.setChunked( true );

         // It may be more appropriate to use FileEntity class in this particular

         // instance but we are using a more generic InputStreamEntity to demonstrate

         // the capability to stream out data from any arbitrary source

         //

         // FileEntity entity = new FileEntity(file, "binary/octet-stream");

         

         httppost.setEntity(reqEntity);

//         httppost.setEntity(entity);

         httpclient.getParams().setIntParameter(HttpConnectionParams.SO_TIMEOUT, 3000 ); //超时设置

         httpclient.getParams().setIntParameter(HttpConnectionParams.CONNECTION_TIMEOUT, 3000 ); //连接超时

         System.out.println( "executing request " + httppost.getRequestLine());

         try {

             HttpResponse response = httpclient.execute(httppost);

             HttpEntity resEntity = response.getEntity();

     

             System.out.println( "----------------------------------------" );

             System.out.println(response.getStatusLine());

             if (resEntity != null ) {

                 System.out.println( "Response content length: " + resEntity.getContentLength());

                 System.out.println( "Chunked?: " + resEntity.isChunked());

                 InputStream is = resEntity.getContent();

                 BufferedReader reader = new BufferedReader(

                         new InputStreamReader(is));

                 try {

                     

                     // do something useful with the response

                     System.out.println(reader.readLine());

                     

                 } catch (IOException ex) {

     

                     // In case of an IOException the connection will be released

                     // back to the connection manager automatically

                     throw ex;

                     

                 } catch (RuntimeException ex) {

     

                     // In case of an unexpected exception you may want to abort

                     // the HTTP request in order to shut down the underlying

                     // connection and release it back to the connection manager.

                     httppost.abort();

                     throw ex;

                     

                 } finally {

     

                     // Closing the input stream will trigger connection release

                     reader.close();

                     

                 }

                 

             }

             if (resEntity != null ) {

                 resEntity.consumeContent();

             }

         } catch (IOException ex) {

             

             // In case of an IOException the connection will be released

             // back to the connection manager automatically

             throw ex;

             

         } catch (RuntimeException ex) {

             

             // In case of an unexpected exception you may want to abort

             // the HTTP request in order to shut down the underlying

             // connection and release it back to the connection manager.

             httppost.abort();

             throw ex;

             

         } finally {

 

             // Closing the input stream will trigger connection release

             

         }

         // When HttpClient instance is no longer needed,

         // shut down the connection manager to ensure

         // immediate deallocation of all system resources

         httpclient.getConnectionManager().shutdown();       

     }

     

}

=================================================================

StringServlet.java

====================================================================

 

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package com.test.servlet;   import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader;   import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;   import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.InputStreamEntity; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.DefaultHttpClient;     public class StringServlet extends HttpServlet {        /**       * The doGet method of the servlet. <br>       *       * This method is called when a form has its tag value method equals to get.       *       * @param request the request send by the client to the server       * @param response the response send by the server to the client       * @throws ServletException if an error occurred       * @throws IOException if an error occurred       */      public void doGet(HttpServletRequest request, HttpServletResponse response)              throws ServletException, IOException {          doPost(request, response);      }        /**       * The doPost method of the servlet. <br>       *       * This method is called when a form has its tag value method equals to post.       *       * @param request the request send by the client to the server       * @param response the response send by the server to the client       * @throws ServletException if an error occurred       * @throws IOException if an error occurred       */      public void doPost(HttpServletRequest request, HttpServletResponse response)              throws ServletException, IOException {          HttpClient client = new DefaultHttpClient();          //InputStream is = new FileInputStream(new File("e:\\3.xml"));          InputStream is = request.getInputStream();          BufferedReader reader = new BufferedReader( new InputStreamReader(is));          StringBuffer  result = new StringBuffer();          String len;          while ((len = reader.readLine()) != null ){              result.append(len);          }          String xml = result.toString();          System.out.println( "struts2.StringServlet:" + xml); //        StringEntity reqEntity = new StringEntity(xml); //        reqEntity.setContentType("application/x-www-form-urlencoded"); //                 InputStreamEntity reqEntity = new InputStreamEntity(is,- 1 );          reqEntity.setContentType( "binary/octet-stream" );          reqEntity.setChunked( true );                    HttpPost post = new HttpPost( "http://localhost:8088/struts2/SendXmlServlet" );          post.setEntity(reqEntity);          HttpResponse res = client.execute(post);          HttpEntity entity = res.getEntity();          if (entity != null ){              System.out.println( "Response content length: " + entity.getContentLength());          }          //显示结果          BufferedReader resultReader = new BufferedReader( new InputStreamReader(entity.getContent()));          String line = null ;          while ((line = resultReader.readLine()) != null ){              System.out.println(line);          }          if (entity != null ){              entity.consumeContent();          }                }   }