使用httpclient发送post请求与get请求

   最近因为项目的要求，需要使用httpclient来发送请求。但是查阅了许多博客，大家发送请求的方法各不相同。原因是因为httpclient的jar包的不同版本，其内部方法也不相同。因此抛开具体用到的jar包而直接复制方法是没有意义的，很容易出现找不到方法的情况。所以在此给出用到的jar包，和在这个jar包下调用的方法。

发送post请求：

@Controller
public class PostController {
	
	@RequestMapping(value="request.html")
	public ModelAndView requestPost(HttpServletRequest request,@RequestParam(value="code")String code)
	{
		AuthConfig config = AuthConfig.getInstance();
		String server = config.getConfigParameter("server");
		String client_id = config.getConfigParameter("client_id");
		String client_secret = config.getConfigParameter("client_secret");
		String redirect_uri = config.getConfigParameter("redirect_uri");
		String scope = config.getConfigParameter("scope");
		System.out.println("授权码是："+code);
		String url = server+"AuthServer/oauth2/token?client_id="+client_id+"&client_secret="+client_secret+"&grant_type=authorization_code&code="+code+"&redirect_uri="+redirect_uri+"&scope="+scope;
		System.out.println(url);
		HttpClient client1 = new HttpClient();  
	    PostMethod method1 = new PostMethod(url);  
	    method1.setRequestHeader("Content-Type","application/json; UTF-8");  
	    //method1.setRequestHeader("Content-Type","text/html; UTF-8");  
	       // NameValuePair[] param = { new NameValuePair("age", "11"),  
	        //        new NameValuePair("name", "jay"), };  
	        //method1.setRequestBody(param);  
	    int statusCode=0;
		try {
			statusCode = client1.executeMethod(method1);
		} catch (HttpException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}  
	    System.out.println(statusCode);  
	    try {
			System.out.println(method1.getResponseBodyAsString());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	    method1.releaseConnection();  
	    System.out.println("...............post Done...............");
		return new ModelAndView("success");
		
	}
}

　　发送get请求：

@Controller
public class AuthorizeCode {
    @RequestMapping(value="code.html")
    public ModelAndView requestPost(HttpServletRequest request){
        HttpClient client = new HttpClient();   
        GetMethod method = new GetMethod("http://localhost:8080/AuthServer/oauth2/authorize?client_id=4o7ymfOJbTNDSPPYvPqyFHvT&client_secret=jgjFw0l4e7oUUH09uH6oLUrW&redirect_uri=https://www.hao123.com&response_type=code&scope=10216051013292419216811211005:close");  
        
        //method.getParams().setParameter("client_id", "4o7ymfOJbTNDSPPYvPqyFHvT");
        //method.getParams().setParameter("client_secret", "jgjFw0l4e7oUUH09uH6oLUrW");
        //method.getParams().setParameter("redirect_uri", "http://localhost:8080/App/request.html");
       // method.getParams().setParameter("response_type", "code");
        //method.getParams().setParameter("scope", "10216051013292419216811211005:close");
        try {  
            // Execute the method.  
            int statusCode = client.executeMethod(method);  
            System.out.println(statusCode);  
            if (statusCode == HttpStatus.SC_OK) {  
                //ins = method.getResponseBodyAsStream();  
                String ss = method.getResponseBodyAsString();
                System.out.println(ss);
              
           } else {  
                System.err.println("Response Code: " + statusCode);  
            }  
        } catch (HttpException e) {  
            System.err.println("Fatal protocol violation: " + e.getMessage());  
        } catch (IOException e) {  
            System.err.println("Fatal transport error: " + e.getMessage());  
        } finally {  
            method.releaseConnection();  
           // if (ins != null) {  
           //     ins.close();  
           // }  
        }  
        
        System.out.println("...............get Done...............");
        return new ModelAndView("code");
    }

在项目中使用这两个方法需要引入jar包：

commons-codec-1.6.jar；

commons-httpclient-3.1-osgi.jar；

commons-logging-1.1.1.jar；

httpcore-4.0.jar。