具体要求是:
服务器端得到客户端传递来的数据,并返回给客户端一条json格式的字符串
闲话不多说,直接上代码
首先是服务器端代码:建立一个web工程,导入struts2和json的jar包,并在web.xml中引入struts2
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>StrutsForAndroid</display-name> <!-- 配置过滤器(即在web中添加struts2) --> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> <!-- 配置后缀 <init-param> <param-name>struts.action.extension</param-name> <param-value>do,html</param-value> </init-param> --> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
web.xml
然后就是java代码啦
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <package name="androidService" namespace="/androidService" extends="struts-default"> <action name="getMessage" class="com.wzy.andriod.actions.AndroidService" method="getMsg"> <result></result> </action> </package> <package name="androidJsonService" namespace="/androidJsonService" extends="struts-default"> <action name="*" class="com.wzy.andriod.actions.AndroidService" method="{1}"> <result ></result> </action> </package> </struts>
androidService.xml
package com.wzy.andriod.actions; import java.io.PrintWriter; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class AndroidService extends SuperAction { private static final long serialVersionUID = 1L; public void getMsg() { System.out.println("开始-->"); try { String name = request.getParameter("name"); System.out.println(name); response.setCharacterEncoding("utf-8"); response.setContentType("text/html"); PrintWriter writer = response.getWriter(); writer.print("get到了"); } catch (Exception e) { e.printStackTrace(); } } public void getJson() { // http://localhost:8080/StrutsForAndroid/androidJsonService/getJson System.out.println("getJson开始-->"); try { request.setCharacterEncoding("UTF-8"); String name = request.getParameter("name"); String passwd = request.getParameter("passwd"); System.out.println("-->"+name); System.out.println("-->"+passwd); JSONArray jsonArray = new JSONArray(); JSONObject jsonObject = new JSONObject(); jsonObject.put("id", 1); jsonObject.put("name", "小明"); jsonObject.put("age", 23); JSONObject jsonObject1 = new JSONObject(); jsonObject1.put("id", 2); jsonObject1.put("name", "小红"); jsonObject1.put("age", 12); JSONObject jsonObject2 = new JSONObject(); jsonObject2.put("id", 3); jsonObject2.put("name", "Jack"); jsonObject2.put("age", 100); jsonArray.add(0, jsonObject); jsonArray.add(1, jsonObject1); jsonArray.add(2, jsonObject2); response.setCharacterEncoding("UTF-8"); response.setContentType("text/html"); PrintWriter writer = response.getWriter(); // System.out.println(jsonArray.toString()); writer.print(jsonArray.toString()); } catch (Exception e) { e.printStackTrace(); } } }
AndroidService.java
package com.wzy.andriod.actions; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.struts2.interceptor.ServletRequestAware; import org.apache.struts2.interceptor.ServletResponseAware; import org.apache.struts2.util.ServletContextAware; import com.opensymphony.xwork2.ActionSupport; //所有的action动作的父类 public class SuperAction extends ActionSupport implements ServletRequestAware, ServletResponseAware, ServletContextAware { private static final long serialVersionUID = 1L; /*serialVersionUID作用是序列化时保持版本的兼容性,即在版本升级时反序列化仍保持对象的唯一性。*/ protected HttpServletRequest request; protected HttpServletResponse response; protected ServletContext application; protected HttpSession session; @Override public void setServletContext(ServletContext application) { this.application = application; } @Override public void setServletResponse(HttpServletResponse response) { this.response = response; } @Override public void setServletRequest(HttpServletRequest request) { this.request = request; this.session = this.request.getSession(); } }
SuperAction.java
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <package name="default" namespace="/" extends="struts-default"> </package> <include file="com/struts2/files/androidService.xml"></include> </struts>
struts.xml
开启tomcat服务器后,通过浏览器访问是如下效果
后台打印结果
以上就是服务端代码部署情况,接下来是安卓客户端代码
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.strutsclient" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.strutsclient.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-permission android:name="android.permission.INTERNET"/> </manifest>
AndroidManifest.xml
layout中建立一个用户登录界面
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <EditText android:id="@+id/name" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:text="123"> </EditText> <EditText android:id="@+id/passwd" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="123" android:ems="10" /> <Button android:id="@+id/login" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="确定" /> </LinearLayout>
userlogin.xml
然后就是java代码啦
package com.example.strutsclient; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import android.util.Log; public class HttpDownloader { public String download(String urlStr) { StringBuffer sb = new StringBuffer(); String line = null; BufferedReader buffer = null; try { URL url = new URL(urlStr);// 创建url对象 HttpURLConnection urlConn = (HttpURLConnection) url .openConnection();// 创建http链接 Log.i("---->", "----11----"); InputStream stream = urlConn.getInputStream(); Log.i("---->", "----22----"); buffer = new BufferedReader(new InputStreamReader(stream));// io流 Log.i("---->", "----33----"); while ((line = buffer.readLine()) != null) { sb.append(line); } } catch (Exception e) { Log.i("---->", e.toString()); e.printStackTrace(); return "wrong"; } finally { try { buffer.close(); } catch (Exception e) { e.printStackTrace(); } } return sb.toString(); } }
HttpDownloader.java
package com.example.strutsclient; import android.os.Build; import android.os.Bundle; import android.os.StrictMode; import android.annotation.SuppressLint; import android.annotation.TargetApi; import android.app.Activity; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; @TargetApi(Build.VERSION_CODES.GINGERBREAD) @SuppressLint("NewApi") public class MainActivity extends Activity { EditText name; EditText passwd; Button login; String sname; String spasswd; @TargetApi(Build.VERSION_CODES.GINGERBREAD) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.userlogin); // 防止android.os.NetworkOnMainThreadException,可使用异步加载或者加入以下代码 // 因为访问网络会消耗很长时间,安卓会认为死机了,所有出现异常 StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder() .detectDiskReads().detectDiskWrites().detectNetwork() .penaltyLog().build()); StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder() .detectLeakedSqlLiteObjects().detectLeakedClosableObjects() .penaltyLog().penaltyDeath().build()); this.name = (EditText) super.findViewById(R.id.name); this.passwd = (EditText) super.findViewById(R.id.passwd); this.login = (Button) super.findViewById(R.id.login); // Toast.makeText(this, name.getText(), Toast.LENGTH_SHORT).show(); login.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { sname = name.getText().toString(); spasswd = passwd.getText().toString(); HttpDownloader downloader = new HttpDownloader(); String url = "http://172.22.0.1:8080/StrutsForAndroid/androidJsonService/getJson?name=" + sname + "&passwd=" + spasswd; String msg = downloader.download(url); // Toast.makeText(this, url, Toast.LENGTH_SHORT).show(); login.setText(msg); } }); } }
MainActivity.java
response发送不同类型的数据:
public static void writeJson(HttpServletResponse response, String text) {
render(response, "application/json;charset=UTF-8", text);
}
public static void writeXml(HttpServletResponse response, String text) {
render(response, "text/xml;charset=UTF-8", text);
}
public static void writeText(HttpServletResponse response, String text) {
render(response, "text/plain;charset=UTF-8", text);
}
public static void render(HttpServletResponse response, String contentType,
String text) {
response.setContentType(contentType);
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
try {
response.getWriter().write(text);
} catch (IOException e) {
//log.error(e.getMessage(), e);
}
}