简易的BaseActon

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSON;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.context.ServletConfigAware;
import org.springframework.web.context.ServletContextAware;

import com.opensymphony.xwork2.ActionSupport;

/**
 * @author wu0018
 * @version 1.0.0
 * @since 2012-4-5下午3:12:22
 */
public class BaseAction extends ActionSupport implements ServletRequestAware, ServletResponseAware, ServletConfigAware, ServletContextAware {
	private static final long serialVersionUID = 5105067211451638888L;
	private final static Logger log = LoggerFactory.getLogger(BaseAction.class);

	protected ServletRequest request = null;
	protected ServletResponse response = null;
	protected ServletContext context = null;
	protected ServletConfig config = null;

	protected JSONObject getJSONObject(String content) throws Exception {
		return JSONObject.fromObject(content);
	}

	protected JSONArray getJSONArray(String content) throws Exception {
		return JSONArray.fromObject(content);
	}

	protected String getRequestContent() {
		StringBuffer buf = new StringBuffer();
		InputStream is = null;
		try {
			is = new BufferedInputStream(request.getInputStream());
			if (null != is) {
				while (true) {
					byte[] b = new byte[1024];

					if (is.read(b) != -1) {
						buf.append(new String(b, Constant.encoding));
					} else {
						break;
					}
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (null != is) {
				try {
					is.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return buf.toString();
	}

	protected String render(String text, String contentType) {
		try {
			response.setContentType(contentType);
			response.getWriter().write(text);
		} catch (IOException e) {
			log.error(e.getMessage(), e);
		}
		return null;
	}

	protected String renderText(String text) {
		return render(text, "text/plain;charset=utf-8");
	}

	protected String renderHtml(String html) {
		return render(html, "text/html;charset=utf-8");
	}

	protected String renderXML(String xml) {
		return render(xml, "text/xml;charset=utf-8");
	}

	protected String renderJSON(String json) {
		//return render(StringEscapeUtils.escapeJavaScript(json), "application/json;charset=utf-8");
		return render(json, "application/json;charset=utf-8");
	}

	protected String renderJSON(Map<String, Object> jsonMap) {
		JSON json = JSONSerializer.toJSON(jsonMap);
		return render(json.toString(), "application/json;charset=utf-8");
	}

	@Override
	public void setServletResponse(HttpServletResponse response) {
		this.response = response;
	}

	@Override
	public void setServletRequest(HttpServletRequest request) {
		this.request = request;
	}

	@Override
	public void setServletContext(ServletContext context) {
		this.context = context;
	}

	@Override
	public void setServletConfig(ServletConfig config) {
		this.config = config;
	}

}