httpclient上传文件实例

HttpClient client = new HttpClient();
PostMethod method = new PostMethod(URL);//具体method里面还可以设置一下编码，header之类的
//1. 第一种方式，基于Content-Type=‘multipart/form-data’形式的表单
Part[] parts = ...;//FilePart和StringPart都可以放进去
method.setRequestEntity(new MultipartRequestEntity(parts, method.getParams()));
//2. 第二种方式，普通表单
NameValuePair[] pairs = ...;//纯参数了，键值对
method.addParameters(pairs);

client.executeMethod(method);//这返回的是状态码，如果需要一些数据可以用String rspMsg = postMethod.getResponseBodyAsString()；

private void parseRequest(HttpServletRequest request) throws Exception {
	boolean isMultipart = ServletFileUpload.isMultipartContent(request);
	if (isMultipart) {
		DiskFileItemFactory factory = new DiskFileItemFactory();
		ServletFileUpload upload = new ServletFileUpload(factory);
		List items = upload.parseRequest(request);
		for (int i = 0; i < items.size(); i++) {
			FileItem item = (FileItem) items.get(i);
			if (!item.isFormField()) {
				//文件数据
			} else {
				//普通表单数据
			}
		}
	} else {
		Enumeration en = request.getParameterNames();
		while (en.hasMoreElements()) {
			String paramName = (String) en.nextElement();
			String paramValue = request.getParameter(paramName);
		}
	}
}