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);

}

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上面的代码模拟的表单为

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

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. * * 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. * * 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(); } } }