commons httpclient 工具类 代码总结

发送Get请求

public class TestA {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception{
		// TODO Auto-generated method stub
		
		
		HttpClient client = new HttpClient( );

        String url = "http://www.discursive.com/cgi-bin/jccook/param_list.cgi";

        HttpMethod method = new GetMethod( url );

 		//设置请求参数同时给参数编码
        method.setQueryString(URIUtil.encodeQuery("test1=O Reilly&blah=Whoop"));

		System.out.println( "With Query String: " + method.getURI( ) );

		client.executeMethod( method );

		System.out.println( "Response:\n " + method.getResponseBodyAsString( ) );

		method.releaseConnection( );

	}

}

设置相关Header信息

    private void setHeaders(HttpMethod method) {

        method.setRequestHeader(new Header("If-None-Match", entityTag ) );

        method.setRequestHeader(new Header("If-Modified-Since", 

                               lastModified ) );

    }

发送POST请求

HttpClient client = new HttpClient( );

        

// Create POST method

String url = "http://www.discursive.com/cgi-bin/jccook/param_list.cgi";

PostMethod method = new PostMethod( url );



// Set parameters on POST    

method.setParameter( "test1", "Hello World" );

method.addParameter( "test2", "This is a Form Submission" );

method.addParameter( "Blah", "Whoop" );

method.addParameter( new NameValuePair( "Blah", "Whoop2" ) );



// Execute and print response

client.executeMethod( method );

String response = method.getResponseBodyAsString( );

System.out.println( response );



method.releaseConnection( );

POST请求发送一个文件

HttpClient client = new HttpClient( );

        

// Create POST method

String weblintURL = "http://ats.nist.gov/cgi-bin/cgi.tcl/echo.cgi";

PostMethod method = new PostMethod( weblintURL );



File file = new File( "project.xml" );

method.setRequestBody( new FileInputStream( file ) );

method.setRequestContentLength( (int)file.length( ) );



// Execute and print response

client.executeMethod( method );

String response = method.getResponseBodyAsString( );

System.out.println( response );



method.releaseConnection( );

POST请求上传多个文件

HttpClient client = new HttpClient( );

        

// Create POST method

String weblintURL = "http://ats.nist.gov/cgi-bin/cgi.tcl/echo.cgi";

MultipartPostMethod method = 

    new MultipartPostMethod( weblintURL );



File file = new File( "data", "test.txt" );

File file2 = new File( "data", "sample.txt" );

method.addParameter("test.txt", file );

method.addPart( new FilePart( "sample.txt", file2, "text/plain", 

"ISO-8859-1" ) ); 



// Execute and print response

client.executeMethod( method );

String response = method.getResponseBodyAsString( );

System.out.println( response );



method.releaseConnection( );

访问需要认证的系统

HttpClient client = new HttpClient( );

HttpState state = client.getState( );

    

// Set credentials on the client

Credentials credentials =

     new UsernamePasswordCredentials( "testuser", "crazypass" );

state.setCredentials( null, null, credentials );



String url = "http://www.discursive.com/jccook/auth/";

HttpMethod method = new GetMethod( url );

    

client.executeMethod( method );

String response = method.getResponseBodyAsString( );



System.out.println( response );

method.releaseConnection( );

请求添加Cookie

HttpClient client = new HttpClient( );

Cookie cookie = new Cookie(".discursive.com", "test_cookie", 

                           "hello", "/", null, false );

client.getState( ).addCookie( cookie );