android网络编程
转自：http://www.linuxidc.com/Linux/2011-04/35009.htm
（http://www.blogjava.net/changcheng/archive/2010/03/04/314496.html）
Android 网络编程---STRUTS2,JSON，HttpClient
在Android开发过程中，我们需要访问网络上的Web资源，比如网络上的WEB请求。在这里Android就好像是一个终端，可以用来接收Web服务器端发送过来的数据。下面我以Struts2作为Web服务器端的Web框架。来说明Android客户端接收Web请求的过程。
首先，我们要配置Web服务器端，添加Struts2所需要的JAR包（包括JSON包）
下面是服务器端所要配置的JAR包，如下所示：
我们看看json包，有如下： json-lib-**.jdk15.jar,struts2-json-plugin-***.jar,ezmorph-**.jar
接下配置web.xml文件，代码如下所示：
1. <!-- 定义Struts2的核心控制器：FilterDispatcher -->
2. <filter>
3. <!-- 定义核心Filter的名称 -->
4. <filter-name>struts2</filter-name>
5. <!-- 定义Filter的实现类 -->
6. <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
7. </filter>
8.
9. <filter-mapping>
10. <filter-name>struts2</filter-name>
11. <url-pattern>/*</url-pattern>
12. </filter-mapping>
添加完JAR包后。我们来配置一下struts.xml文件，这个文件存放在src根目录下面，代码如下所示：
1. <?xml version="1.0" encoding="UTF-8"?>
2. <!DOCTYPE struts PUBLIC
3. "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
4. "http://struts.apache.org/dtds/struts-2.0.dtd">
5. <struts>
6. <!-- setting encoding,DynamicMethod,language
7. <constant name="struts.custom.i18n.resources" value="messageResource"></constant>
8. -->
9. <constant name="struts.i18n.encoding" value="UTF-8"></constant>
10. <constant name="struts.enable.DynamicMethodInvocation"
11. value="true">
12. </constant>
13. <!--
14. truts.enable.DynamicMethodInvocation = true，-动态方法调用，
15. 为true时，就可以在struts.xml配置“*”的通配符，来调用action里的方法
16. -->
17. <!-- add package here extends="struts-default"-->
18. <package name="dongzi" extends="json-default"><!--需要将struts-default改为json-default-->
19. <!-- setting action -->
20. <action name="login" class="com.dongzi.action.LoginAction"
21. method="login">
22. <result type="json"></result>
23. <!--返回值类型设置为json,不设置返回页面-->
24. </action>
25. </package>
26. </struts>
看看这个action
<action name="login" class="com.dongzi.action.LoginAction"
method="login">
<result type="json"></result>
<!--返回值类型设置为json,不设置返回页面-->
</action>
返回的是json 数据。而且是由LoginAction类去处理，它存放在com.dongzi.action下面。LoginAction类的代码如下：
1. public class LoginAction extends ActionSupport implements ServletRequestAware,
2. ServletResponseAware {
3. /**
4. *
5. */
6. private static final long serialVersionUID = 1L;
7. HttpServletRequest request;
8. HttpServletResponse response;
9. public void setServletRequest(HttpServletRequest request) {
10. this.request = request;
11. }
12. public void setServletResponse(HttpServletResponse response) {
13. this.response = response;
14. }
15. public void login() {
16. try {
17. // HttpServletRequest request =ServletActionContext.getRequest();
18. // HttpServletResponse response=ServletActionContext.getResponse();
19. this.response.setContentType("text/html;charset=utf-8");
20. this.response.setCharacterEncoding("UTF-8");
21. // 将要返回的实体对象进行json处理
22. // JSONObject json=JSONObject.fromObject(this.getUsername());
23. // 输出格式如：{"id":1, "username":"zhangsan", "pwd":"123"}
24. // System.out.println(json);
25.
26. // this.response.getWriter().write(json.toString());
27.
28. //{"username":"mingg","password":"123"}
29. JSONObject json=new JSONObject();
30. // json.put("username", "mingg");
31. // json.put("password","123");
32.
33.
34.
35. //【这里在JSON中包含一个Map】
36. Map map=new HashMap<Object, String>();
37. map.put("username", "xiaomingg");
38. map.put("password", "1234");
39. map.put("state", "1");
40. json.put("userbean", map);
41.
42. response.getWriter().write(json.toString());
43. ////{"userbean":{"username":"100196","password":"1234453","State":1}}
44.
45.
46. /**
47. * 值的数组
48.
49. {"people": [
50. {"username":"mingg","password":"123","email":"[email protected]"},
51.
52. {"username":"jie","password":"111","email":"[email protected]"},
53.
54. {"username":"yong","password":"1232","email":"[email protected]"}
55. ]}
56.
57. */
58.
59.
60.
61. // JSONArray jsonArray=new JSONArray();
62. //
63. // JSONObject json=new JSONObject();
64. // json.put("username", "mingg");
65. // json.put("password","123");
66. // json.put("email", "[email protected]");
67. //
68. // JSONObject json1=new JSONObject();
69. // json1.put("username", "jie");
70. // json1.put("password","111");
71. // json1.put("email", "[email protected]");
72. //
73. // JSONObject json2=new JSONObject();
74. // json2.put("username", "yong");
75. // json2.put("password","1232");
76. // json2.put("email", "[email protected]");
77. //
78. // jsonArray.add(0, json);
79. // jsonArray.add(1, json1);
80. // jsonArray.add(2, json2);
81. //
82. //
83. // JSONObject alObject=new JSONObject();
84. // alObject.put("people", jsonArray);
85.
86.
87.
88. /***
89. *{ "programmers": [
90. * {"username":"mingg","password":"123","email":"[email protected]"},
91. *
92. * {"username":"jie","password":"111","email":"[email protected]"},
93. *
94. * {"username":"yong","password":"1232","email":"[email protected]"}],
95. * "authors": [
96. * {"username":"mingg","password":"123","genre":"science fiction"},
97. *
98. * {"username":"jie","password":"111","genre":"fantasy"},
99. *
100. * {"username":"yong","password":"1232","genre":"christian fiction"}],
101. * "musicians": [
102. * {"username":"mingg","password":"123","instrument":"guitar"},
103. *
104. * {"username":"jie","password":"111","instrument":"piano"},
105. *
106. * {"username":"yong","password":"1232","instrument":"flute"}]
107. * }
108. *
109. */
110.
111.
112. // JSONArray jsonArray=new JSONArray();
113. //
114. // JSONObject json=new JSONObject();
115. // json.put("username", "mingg");
116. // json.put("password","123");
117. // json.put("email", "[email protected]");
118. //
119. // JSONObject json1=new JSONObject();
120. // json1.put("username", "jie");
121. // json1.put("password","111");
122. // json1.put("email", "[email protected]");
123. //
124. // JSONObject json2=new JSONObject();
125. // json2.put("username", "yong");
126. // json2.put("password","1232");
127. // json2.put("email", "[email protected]");
128. //
129. // jsonArray.add(0, json);
130. // jsonArray.add(1, json1);
131. // jsonArray.add(2, json2);
132. //
133. //
134. //
135. // JSONArray jsonArray2=new JSONArray();
136. //
137. // JSONObject json20=new JSONObject();
138. // json20.put("username", "mingg");
139. // json20.put("password","123");
140. // json20.put("genre", "science fiction");
141. //
142. // JSONObject json21=new JSONObject();
143. // json21.put("username", "jie");
144. // json21.put("password","111");
145. // json21.put("genre", "fantasy");
146. //
147. // JSONObject json22=new JSONObject();
148. // json22.put("username", "yong");
149. // json22.put("password","1232");
150. // json22.put("genre", "christian fiction");
151. //
152. // jsonArray2.add(0, json20);
153. // jsonArray2.add(1, json21);
154. // jsonArray2.add(2, json22);
155. //
156. //
157. // JSONArray jsonArray3=new JSONArray();
158. //
159. // JSONObject json30=new JSONObject();
160. // json30.put("username", "mingg");
161. // json30.put("password","123");
162. // json30.put("instrument", "guitar");
163. //
164. // JSONObject json31=new JSONObject();
165. // json31.put("username", "jie");
166. // json31.put("password","111");
167. // json31.put("instrument", "piano");
168. //
169. // JSONObject json32=new JSONObject();
170. // json32.put("username", "yong");
171. // json32.put("password","1232");
172. // json32.put("instrument", "flute");//笛
173. //
174. // jsonArray3.add(0, json30);
175. // jsonArray3.add(1, json31);
176. // jsonArray3.add(2, json32);
177. //
178. //
179. // JSONObject alObject=new JSONObject();
180. // alObject.put("programmers", jsonArray);
181. // alObject.put("authors", jsonArray2);
182. // alObject.put("musicians", jsonArray3);
183.
184.
185. /**
186. * yong:1232:[email protected]
187. */
188. //获取任意节点的值：试例，第个节点，第三个子节点
189.
190. // JSONArray jsonArrayt11 = (JSONArray) alObject.get("programmers");
191. //
192. // JSONObject jsonObject11=(JSONObject)jsonArrayt11.get(2);
193. //
194. // String username=jsonObject11.getString("username");
195. // String password=jsonObject11.getString("password");
196. // String email=jsonObject11.getString("email");
197. //
198. // StringBuffer sBuffer=new StringBuffer();
199. // sBuffer.append(username+":").append(password+":").append(email);
200.
201.
202. // response.getWriter().write(username.toString());
203.
204.
205.
206.
207. /**
208. * JSONObject json=new JSONObject(); json.put("login", "login");
209. * response.setContentType("text/html;charset=utf-8");
210. * System.out.println(json); byte[] jsonBytes =
211. * json.toString().getBytes("utf-8");
212. * response.setContentLength(jsonBytes.length);
213. * response.getOutputStream().write(jsonBytes);
214. */
215.
216. // JSONObject json=new JSONObject();
217. // json.put("login", "login");
218. // byte[] jsonBytes = json.toString().getBytes("utf-8");
219. // response.setContentType("text/html;charset=utf-8");
220. // response.setContentLength(jsonBytes.length);
221. // response.getOutputStream().write(jsonBytes);
222. // response.getOutputStream().flush();
223. // response.getOutputStream().close();
224.
225. } catch (Exception e) {
226. e.printStackTrace();
227. }
228. // return null;
229. }
230. }
我下面简单说一下JSON解析过程。
JSONObject json=new JSONObject();
//【这里在JSON中包含一个Map】
Map map=new HashMap<Object, String>();
map.put("username", "xiaomingg");
map.put("password", "1234");
map.put("state", "1");
json.put("userbean", map);
response.getWriter().write(json.toString());
通过访问http://localhost:8888/AndroidServerApp/login.action，得到如下JSON数据：
服务器端的配置完成了。下面我来配置Android客户端了。
由于Android内置提拱了解析JSON数据的包。所以就不需要使用第三方包了
Android 访问网络资源的代码如下所示：
1. private static String url = "http://10.0.2.2:8888/AndroidServerApp/login.action";
2. getPDAServerData(url);
3. private void getPDAServerData(String url) {
4. HttpClient client = new DefaultHttpClient();
5. //提拱默认的HttpClient实现
6. HttpPost request;
7. try {
8. request = new HttpPost(new URI(url));
9. HttpResponse response = client.execute(request);
10. // 判断请求是否成功
11. if (response.getStatusLine().getStatusCode() == 200) { //200表示请求成功
12. HttpEntity entity = response.getEntity();
13. if (entity != null) {
14. String out = EntityUtils.toString(entity);
15. JSONObject jsonObject;
16. String username = "";
17. String password = "";
18. String stateStr="";
19.
20. UserBean userBean=new UserBean();
21. try {
22.
23. //{"userbean":{"username":"100196","password":"1234453","State":1}}
24. //JSONObject jsonObject = new JSONObject(builder.toString()).getJSONObject("userbean");
25.
26. jsonObject = new JSONObject(out).getJSONObject("userbean");
27.
28.
29. userBean.setUsername(jsonObject.getString("username"));
30. userBean.setPassword( jsonObject.getString("password"));
31. userBean.setState(Integer.parseInt(jsonObject.getString("state")));
32.
33.
34.
35. } catch (JSONException e) {
36. // TODO Auto-generated catch block
37. e.printStackTrace();
38. }
39. new AlertDialog.Builder(this).setMessage(
40. userBean.getUsername() + ":" + userBean.getState()).create().show();
41. }
42. }
43. } catch (URISyntaxException e) {
44. e.printStackTrace();
45. new AlertDialog.Builder(this).setMessage(e.getMessage()).create()
46. .show();
47. } catch (ClientProtocolException e) {
48. e.printStackTrace();
49. new AlertDialog.Builder(this).setMessage(e.getMessage()).create()
50. .show();
51. } catch (IOException e) {
52. e.printStackTrace();
53. new AlertDialog.Builder(this).setMessage(e.getMessage()).create()
54. .show();
55. }
56. }
里面的IP地址：10.0.2.2，代表着手机模拟器本地的地址，相当于localhost,但不能使用localhost,或者127.0.0.1，因不是在PC机上测试，而是在手机AVD上测试之。
而UserBean.java,它就是一个JAVABEAN,代码如下所示：
1. package po;
2. public class UserBean {
3. private String username;
4. private String password;
5. private int state;
6. public String getUsername() {
7. return username;
8. }
9. public void setUsername(String username) {
10. this.username = username;
11. }
12. public String getPassword() {
13. return password;
14. }
15. public void setPassword(String password) {
16. this.password = password;
17. }
18. public int getState() {
19. return state;
20. }
21. public void setState(int state) {
22. this.state = state;
23. }
24. }
注恴必须AndroidManifest.xml中加入如下代码，不然Android就不能访问web资源。
1. <uses-permission Android:name="android.permission.INTERNET" />
（http://www.blogjava.net/changcheng/archive/2010/03/04/314496.html）
Android 网络编程---STRUTS2,JSON，HttpClient
在Android开发过程中，我们需要访问网络上的Web资源，比如网络上的WEB请求。在这里Android就好像是一个终端，可以用来接收Web服务器端发送过来的数据。下面我以Struts2作为Web服务器端的Web框架。来说明Android客户端接收Web请求的过程。
首先，我们要配置Web服务器端，添加Struts2所需要的JAR包（包括JSON包）
下面是服务器端所要配置的JAR包，如下所示：
我们看看json包，有如下： json-lib-**.jdk15.jar,struts2-json-plugin-***.jar,ezmorph-**.jar
接下配置web.xml文件，代码如下所示：
1. <!-- 定义Struts2的核心控制器：FilterDispatcher -->
2. <filter>
3. <!-- 定义核心Filter的名称 -->
4. <filter-name>struts2</filter-name>
5. <!-- 定义Filter的实现类 -->
6. <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
7. </filter>
8.
9. <filter-mapping>
10. <filter-name>struts2</filter-name>
11. <url-pattern>/*</url-pattern>
12. </filter-mapping>
添加完JAR包后。我们来配置一下struts.xml文件，这个文件存放在src根目录下面，代码如下所示：
1. <?xml version="1.0" encoding="UTF-8"?>
2. <!DOCTYPE struts PUBLIC
3. "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
4. "http://struts.apache.org/dtds/struts-2.0.dtd">
5. <struts>
6. <!-- setting encoding,DynamicMethod,language
7. <constant name="struts.custom.i18n.resources" value="messageResource"></constant>
8. -->
9. <constant name="struts.i18n.encoding" value="UTF-8"></constant>
10. <constant name="struts.enable.DynamicMethodInvocation"
11. value="true">
12. </constant>
13. <!--
14. truts.enable.DynamicMethodInvocation = true，-动态方法调用，
15. 为true时，就可以在struts.xml配置“*”的通配符，来调用action里的方法
16. -->
17. <!-- add package here extends="struts-default"-->
18. <package name="dongzi" extends="json-default"><!--需要将struts-default改为json-default-->
19. <!-- setting action -->
20. <action name="login" class="com.dongzi.action.LoginAction"
21. method="login">
22. <result type="json"></result>
23. <!--返回值类型设置为json,不设置返回页面-->
24. </action>
25. </package>
26. </struts>
看看这个action
<action name="login" class="com.dongzi.action.LoginAction"
method="login">
<result type="json"></result>
<!--返回值类型设置为json,不设置返回页面-->
</action>
返回的是json 数据。而且是由LoginAction类去处理，它存放在com.dongzi.action下面。LoginAction类的代码如下：
1. public class LoginAction extends ActionSupport implements ServletRequestAware,
2. ServletResponseAware {
3. /**
4. *
5. */
6. private static final long serialVersionUID = 1L;
7. HttpServletRequest request;
8. HttpServletResponse response;
9. public void setServletRequest(HttpServletRequest request) {
10. this.request = request;
11. }
12. public void setServletResponse(HttpServletResponse response) {
13. this.response = response;
14. }
15. public void login() {
16. try {
17. // HttpServletRequest request =ServletActionContext.getRequest();
18. // HttpServletResponse response=ServletActionContext.getResponse();
19. this.response.setContentType("text/html;charset=utf-8");
20. this.response.setCharacterEncoding("UTF-8");
21. // 将要返回的实体对象进行json处理
22. // JSONObject json=JSONObject.fromObject(this.getUsername());
23. // 输出格式如：{"id":1, "username":"zhangsan", "pwd":"123"}
24. // System.out.println(json);
25.
26. // this.response.getWriter().write(json.toString());
27.
28. //{"username":"mingg","password":"123"}
29. JSONObject json=new JSONObject();
30. // json.put("username", "mingg");
31. // json.put("password","123");
32.
33.
34.
35. //【这里在JSON中包含一个Map】
36. Map map=new HashMap<Object, String>();
37. map.put("username", "xiaomingg");
38. map.put("password", "1234");
39. map.put("state", "1");
40. json.put("userbean", map);
41.
42. response.getWriter().write(json.toString());
43. ////{"userbean":{"username":"100196","password":"1234453","State":1}}
44.
45.
46. /**
47. * 值的数组
48.
49. {"people": [
50. {"username":"mingg","password":"123","email":"[email protected]"},
51.
52. {"username":"jie","password":"111","email":"[email protected]"},
53.
54. {"username":"yong","password":"1232","email":"[email protected]"}
55. ]}
56.
57. */
58.
59.
60.
61. // JSONArray jsonArray=new JSONArray();
62. //
63. // JSONObject json=new JSONObject();
64. // json.put("username", "mingg");
65. // json.put("password","123");
66. // json.put("email", "[email protected]");
67. //
68. // JSONObject json1=new JSONObject();
69. // json1.put("username", "jie");
70. // json1.put("password","111");
71. // json1.put("email", "[email protected]");
72. //
73. // JSONObject json2=new JSONObject();
74. // json2.put("username", "yong");
75. // json2.put("password","1232");
76. // json2.put("email", "[email protected]");
77. //
78. // jsonArray.add(0, json);
79. // jsonArray.add(1, json1);
80. // jsonArray.add(2, json2);
81. //
82. //
83. // JSONObject alObject=new JSONObject();
84. // alObject.put("people", jsonArray);
85.
86.
87.
88. /***
89. *{ "programmers": [
90. * {"username":"mingg","password":"123","email":"[email protected]"},
91. *
92. * {"username":"jie","password":"111","email":"[email protected]"},
93. *
94. * {"username":"yong","password":"1232","email":"[email protected]"}],
95. * "authors": [
96. * {"username":"mingg","password":"123","genre":"science fiction"},
97. *
98. * {"username":"jie","password":"111","genre":"fantasy"},
99. *
100. * {"username":"yong","password":"1232","genre":"christian fiction"}],
101. * "musicians": [
102. * {"username":"mingg","password":"123","instrument":"guitar"},
103. *
104. * {"username":"jie","password":"111","instrument":"piano"},
105. *
106. * {"username":"yong","password":"1232","instrument":"flute"}]
107. * }
108. *
109. */
110.
111.
112. // JSONArray jsonArray=new JSONArray();
113. //
114. // JSONObject json=new JSONObject();
115. // json.put("username", "mingg");
116. // json.put("password","123");
117. // json.put("email", "[email protected]");
118. //
119. // JSONObject json1=new JSONObject();
120. // json1.put("username", "jie");
121. // json1.put("password","111");
122. // json1.put("email", "[email protected]");
123. //
124. // JSONObject json2=new JSONObject();
125. // json2.put("username", "yong");
126. // json2.put("password","1232");
127. // json2.put("email", "[email protected]");
128. //
129. // jsonArray.add(0, json);
130. // jsonArray.add(1, json1);
131. // jsonArray.add(2, json2);
132. //
133. //
134. //
135. // JSONArray jsonArray2=new JSONArray();
136. //
137. // JSONObject json20=new JSONObject();
138. // json20.put("username", "mingg");
139. // json20.put("password","123");
140. // json20.put("genre", "science fiction");
141. //
142. // JSONObject json21=new JSONObject();
143. // json21.put("username", "jie");
144. // json21.put("password","111");
145. // json21.put("genre", "fantasy");
146. //
147. // JSONObject json22=new JSONObject();
148. // json22.put("username", "yong");
149. // json22.put("password","1232");
150. // json22.put("genre", "christian fiction");
151. //
152. // jsonArray2.add(0, json20);
153. // jsonArray2.add(1, json21);
154. // jsonArray2.add(2, json22);
155. //
156. //
157. // JSONArray jsonArray3=new JSONArray();
158. //
159. // JSONObject json30=new JSONObject();
160. // json30.put("username", "mingg");
161. // json30.put("password","123");
162. // json30.put("instrument", "guitar");
163. //
164. // JSONObject json31=new JSONObject();
165. // json31.put("username", "jie");
166. // json31.put("password","111");
167. // json31.put("instrument", "piano");
168. //
169. // JSONObject json32=new JSONObject();
170. // json32.put("username", "yong");
171. // json32.put("password","1232");
172. // json32.put("instrument", "flute");//笛
173. //
174. // jsonArray3.add(0, json30);
175. // jsonArray3.add(1, json31);
176. // jsonArray3.add(2, json32);
177. //
178. //
179. // JSONObject alObject=new JSONObject();
180. // alObject.put("programmers", jsonArray);
181. // alObject.put("authors", jsonArray2);
182. // alObject.put("musicians", jsonArray3);
183.
184.
185. /**
186. * yong:1232:[email protected]
187. */
188. //获取任意节点的值：试例，第个节点，第三个子节点
189.
190. // JSONArray jsonArrayt11 = (JSONArray) alObject.get("programmers");
191. //
192. // JSONObject jsonObject11=(JSONObject)jsonArrayt11.get(2);
193. //
194. // String username=jsonObject11.getString("username");
195. // String password=jsonObject11.getString("password");
196. // String email=jsonObject11.getString("email");
197. //
198. // StringBuffer sBuffer=new StringBuffer();
199. // sBuffer.append(username+":").append(password+":").append(email);
200.
201.
202. // response.getWriter().write(username.toString());
203.
204.
205.
206.
207. /**
208. * JSONObject json=new JSONObject(); json.put("login", "login");
209. * response.setContentType("text/html;charset=utf-8");
210. * System.out.println(json); byte[] jsonBytes =
211. * json.toString().getBytes("utf-8");
212. * response.setContentLength(jsonBytes.length);
213. * response.getOutputStream().write(jsonBytes);
214. */
215.
216. // JSONObject json=new JSONObject();
217. // json.put("login", "login");
218. // byte[] jsonBytes = json.toString().getBytes("utf-8");
219. // response.setContentType("text/html;charset=utf-8");
220. // response.setContentLength(jsonBytes.length);
221. // response.getOutputStream().write(jsonBytes);
222. // response.getOutputStream().flush();
223. // response.getOutputStream().close();
224.
225. } catch (Exception e) {
226. e.printStackTrace();
227. }
228. // return null;
229. }
230. }
我下面简单说一下JSON解析过程。
JSONObject json=new JSONObject();
//【这里在JSON中包含一个Map】
Map map=new HashMap<Object, String>();
map.put("username", "xiaomingg");
map.put("password", "1234");
map.put("state", "1");
json.put("userbean", map);
response.getWriter().write(json.toString());
通过访问http://localhost:8888/AndroidServerApp/login.action，得到如下JSON数据：
服务器端的配置完成了。下面我来配置Android客户端了。
由于Android内置提拱了解析JSON数据的包。所以就不需要使用第三方包了
Android 访问网络资源的代码如下所示：
1. private static String url = "http://10.0.2.2:8888/AndroidServerApp/login.action";
2. getPDAServerData(url);
3. private void getPDAServerData(String url) {
4. HttpClient client = new DefaultHttpClient();
5. //提拱默认的HttpClient实现
6. HttpPost request;
7. try {
8. request = new HttpPost(new URI(url));
9. HttpResponse response = client.execute(request);
10. // 判断请求是否成功
11. if (response.getStatusLine().getStatusCode() == 200) { //200表示请求成功
12. HttpEntity entity = response.getEntity();
13. if (entity != null) {
14. String out = EntityUtils.toString(entity);
15. JSONObject jsonObject;
16. String username = "";
17. String password = "";
18. String stateStr="";
19.
20. UserBean userBean=new UserBean();
21. try {
22.
23. //{"userbean":{"username":"100196","password":"1234453","State":1}}
24. //JSONObject jsonObject = new JSONObject(builder.toString()).getJSONObject("userbean");
25.
26. jsonObject = new JSONObject(out).getJSONObject("userbean");
27.
28.
29. userBean.setUsername(jsonObject.getString("username"));
30. userBean.setPassword( jsonObject.getString("password"));
31. userBean.setState(Integer.parseInt(jsonObject.getString("state")));
32.
33.
34.
35. } catch (JSONException e) {
36. // TODO Auto-generated catch block
37. e.printStackTrace();
38. }
39. new AlertDialog.Builder(this).setMessage(
40. userBean.getUsername() + ":" + userBean.getState()).create().show();
41. }
42. }
43. } catch (URISyntaxException e) {
44. e.printStackTrace();
45. new AlertDialog.Builder(this).setMessage(e.getMessage()).create()
46. .show();
47. } catch (ClientProtocolException e) {
48. e.printStackTrace();
49. new AlertDialog.Builder(this).setMessage(e.getMessage()).create()
50. .show();
51. } catch (IOException e) {
52. e.printStackTrace();
53. new AlertDialog.Builder(this).setMessage(e.getMessage()).create()
54. .show();
55. }
56. }
里面的IP地址：10.0.2.2，代表着手机模拟器本地的地址，相当于localhost,但不能使用localhost,或者127.0.0.1，因不是在PC机上测试，而是在手机AVD上测试之。
而UserBean.java,它就是一个JAVABEAN,代码如下所示：
1. package po;
2. public class UserBean {
3. private String username;
4. private String password;
5. private int state;
6. public String getUsername() {
7. return username;
8. }
9. public void setUsername(String username) {
10. this.username = username;
11. }
12. public String getPassword() {
13. return password;
14. }
15. public void setPassword(String password) {
16. this.password = password;
17. }
18. public int getState() {
19. return state;
20. }
21. public void setState(int state) {
22. this.state = state;
23. }
24. }
注恴必须AndroidManifest.xml中加入如下代码，不然Android就不能访问web资源。
1. <uses-permission Android:name="android.permission.INTERNET" />