HttpClient用法

场景：

在一个servlet/bean中访问另一个servlet

实现方法：

需要：HttpClient.jar (Apache官方网站下载)

1、调用者

......
//创建client
HttpClient client = new HttpClient();
PostMethod postMethod = new PostMethod("xxx/checkuser");
NameValuePair[] data = { 
		new NameValuePair("loginaccount", account),
		new NameValuePair("loginpassword", password)}; 
postMethod.setRequestBody(data);

//访问servlet
int statusCode = client.executeMethod(postMethod); 
if (statusCode != HttpStatus.SC_OK) { 
	response.sendRedirect("/error.html");
}
	
//读取验证结果 
byte[] responseBody = postMethod.getResponseBody(); 
String str = new String(responseBody);
......

2、被调用者

......
public void service(HttpServletRequest request, HttpServletResponse response) {
	try {
		String loginaccount = request.getParameter("loginaccount");
		String loginpassword = request.getParameter("loginpassword");
		.....
		String usersxml = "";
		Document doc = DocumentHelper.createDocument();
		Element root = doc.addElement("user");
		
		root.addAttribute("id", ...);
		root.addAttribute("nickname", ...);
		
		usersxml = doc.asXML();
		response.setCharacterEncoding("UTF-8");
		response.getWriter().println(usersxml);
	} catch (Exception e) {
		......
	}
}
.......