httpClient上传文件

Using the GET Method
The GET method is the most common method used to send an HTTP request. Every time you click a hyperlink, you send an HTTP request using the GET method. You will now see an example of sending a GET request using HttpClient based Java code. The code in Listing 9-1 sends a GET request to the URL http://localhost:8080/validatorStrutsApp/userInfo.do and has three request parameters, firstname, lastname, and email.

Listing 9-1. HttpClientTrial
package com.commonsbook.chap9;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.GetMethod;

public class SubmitHttpForm {

    private static String url =
         "http://localhost:8080/validatorStrutsApp/userInfo.do";

    public static void main(String[] args) {

        //Instantiate an HttpClient
        HttpClient client = new HttpClient();

        //Instantiate a GET HTTP method
        HttpMethod method = new GetMethod(url);

        //Define name-value pairs to set into the QueryString
        NameValuePair nvp1= new NameValuePair("firstName","fname");
        NameValuePair nvp2= new NameValuePair("lastName","lname");
        NameValuePair nvp3= new NameValuePair("email","[email protected]");

        method.setQueryString(new NameValuePair[]{nvp1,nvp2, nvp3});

        try{
            int statusCode = client.executeMethod(method);

            System.out.println("QueryString>>> "+method.getQueryString());
            System.out.println("Status Text>>>"
                  +HttpStatus.getStatusText(statusCode));

            //Get data as a String
            System.out.println(method.getResponseBodyAsString());

            //OR as a byte array
            byte [] res  = method.getResponseBody();

            //write to file
            FileOutputStream fos= new FileOutputStream("donepage.html");
            fos.write(res);

            //release connection
            method.releaseConnection();
        }
        catch(IOException e) {
            e.printStackTrace();
        }
    }
}