android与tomcat服务器交互实例

package action; import java.io.IOException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletresponse; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class AndroidAction extends ActionSupport { HttpServletRequest request=ServletActionContext.getRequest(); HttpServletResponse response = ServletActionContext.getResponse(); @Override public String execute() throws Exception { // TODO Auto-generated method stub return super.execute(); } public void test() { String str = request.getParameter("test"); System.out.println(str); writeOut("hello android"); } /** * 返回值 * @param jsonStr */ public void writeOut(String jsonStr) { response.setContentType("html/txt"); response.setCharacterEncoding("utf-8"); response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache, must-revalidate"); response.setHeader("Pragma", "no-cache"); try { response.getWriter().write(jsonStr); response.getWriter().flush(); response.getWriter().close(); } catch (IOException e) { e.printStackTrace(); } } } 

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"> <struts> <package name="androidaction" extends="json-default" namespace="/androidaction"> <action name="test" class="action.AndroidAction" method="test"> <result type="json" name="success"> <param name="contentType">text/html</param> </result> <result type="json" name="error"> <param name="contentType">text/html</param> </result> </action> </package> </struts> 

public class HelloApacheServerActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final ConnUtil cu = new ConnUtil(); Button btn = (Button)findViewById(R.id.sendMessage); btn.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { String s = cu.sayHello(); Toast.makeText(HelloApacheServerActivity.this,s,Toast.LENGTH_SHORT).show(); } }); } }