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android与tomcat服务器交互实例

一、教程目的。

本教程的目的在于教会怎么完成android与tomcat服务器的数据交互。
二、开发环境。
Myeclipse8.5+jdk1.6+android2.3
三、开发步骤。
(1)新建一个web项目，并添加struts2支持。
new->webproject
1在项目名称右键，Myeclipse->Add Struts Capabilities

struts specification 选择struts2.1
然后选择完成

2新建一个action类

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();
                }
        }
}

　　3.修改struts.xml

<?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>    

　　4.发布web项目 AndroidWebserver上右键 run as Myeclipse server application

(2)新建一个android项目。
记得要加入commons-httpclient-3.1.jar依赖包
新建一个链接工具类ConnUtil.java代码如下

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();
                        }
                 
        });
    }
}

　　对了，android项目要记得添加网络访问权限
<uses-permission android:name="android.permission.INTERNET"/>

最后验证一下
按下"say hello"按钮在myeclipse 的console下可以看到"hello server" 这是从android端发来的消息
同时android会弹出一个Toast "hello android"这是从服务器返回的消息。