httpClient上传文件post方法

Using the POST Method
Listing 9-2 shows an example where you enclose an Extensible Markup Language (XML) file within a request and send it using the POST method to a JSP named GetRequest.jsp. The JSP will just print the request headers it receives. These headers will show if the request got across properly.

Listing 9-2. Sending an XML File Using the POST Method
package com.commonsbook.chap9;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class PostAFile {
    private static String url =
         "http://localhost:8080/HttpServerSideApp/GetRequest.jsp";

    public static void main(String[] args) throws IOException {
        HttpClient client = new HttpClient();
        PostMethod postMethod = new PostMethod(url);

        client.setConnectionTimeout(8000);

        // Send any XML file as the body of the POST request
        File f = new File("students.xml");
        System.out.println("File Length = " + f.length());

        postMethod.setRequestBody(new FileInputStream(f));
        postMethod.setRequestHeader("Content-type",
            "text/xml; charset=ISO-8859-1");

        int statusCode1 = client.executeMethod(postMethod);

        System.out.println("statusLine>>>" + postMethod.getStatusLine());
        postMethod.releaseConnection();
    }
}




Using HttpClient-Based FileUpload
Earlier in the article you saw some of the capabilities of the HttpClient component. One capability I did not cover was its ability to send multipart requests. In this section, you will use this capability to upload a few files to the same JSP that you used for uploads using HTML.

The class org.apache.commons.httpclient.methods.MultipartPostMethod provides the multipart method capability to send multipart-encoded forms, and the package org.apache.commons.httpclient.methods.multipart has the support classes required. Sending a multipart form using HttpClient is quite simple. In the code in Listing 9-6, you send three files to ProcessFileUpload.jsp.

Listing 9-6. HttpMultiPartFileUpload.java
package com.commonsbook.chap9;
import java.io.File;
import java.io.IOException;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.MultipartPostMethod;

public class HttpMultiPartFileUpload {
    private static String url =
      "http://localhost:8080/HttpServerSideApp/ProcessFileUpload.jsp";

    public static void main(String[] args) throws IOException {
        HttpClient client = new HttpClient();
        MultipartPostMethod mPost = new MultipartPostMethod(url);
        client.setConnectionTimeout(8000);

        // Send any XML file as the body of the POST request
        File f1 = new File("students.xml");
        File f2 = new File("academy.xml");
        File f3 = new File("academyRules.xml");

        System.out.println("File1 Length = " + f1.length());
        System.out.println("File2 Length = " + f2.length());
        System.out.println("File3 Length = " + f3.length());

        mPost.addParameter(f1.getName(), f1);
        mPost.addParameter(f2.getName(), f2);
        mPost.addParameter(f3.getName(), f3);

        int statusCode1 = client.executeMethod(mPost);

        System.out.println("statusLine>>>" + mPost.getStatusLine());
        mPost.releaseConnection();
    }
}