http://blog.csdn.net/yanzi1225627/article/details/22222735
一、提交数据
手机App向服务器提交数据原理与web页面向服务器提交数据的原理是一样的，都是依赖于Http协
议，只是使用的API不一样而已。
Android最常见的提交数据的类有3个：HttpURLConnection、HttpClient、AsyncHttpClient，它
们都分get和post两种提交方式其中HttpURLConnection是SDK自带的类；HttpClient本来是第3方开源
项目，不过被google纳入了SDK；AsyncHttpClient是一个使用起来特别简单的第3方开源项目，需要去
GitHub下载jar包。
我将6种不同的提交方式整合到了一起，App UI界面如下：
![wKiom1WtJVaQGXG-AACHnYU0azU088.jpg]( "device-2015-07-21-004428.png")
以下是6种不同方式提交数据的源代码：
1）URLGet方式
URLGet的特点就是直接将请求参数拼接到提交地址的后面
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public
void
loginByURLGet() {
new
Thread() {
public
void
run() {
if
(checkEmpty()) {
String servletPath =
"http://192.168.17.71/QQCenter/login"
;
String urlPath = servletPath +
"?username="
+ username
+
"&password="
+ password;
try
{
URL url =
new
URL(urlPath);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setRequestMethod(
"GET"
);
conn.setConnectTimeout(
5
);
int
responseCode = conn.getResponseCode();
if
(responseCode ==
200
) {
InputStream in = conn.getInputStream();
String content = NetUtils.readStream(in);
showToast(content);
System.out.println(
"URLGet方式登陆"
);
}
else
{
showToast(
"服务器找不到资源"
);
}
}
catch
(Exception e) {
e.printStackTrace();
showToast(
"服务器忙！！！"
);
}
}
}
}.start();
}
|
2）URLPost方式
URLPost的特点就是将提交的参数通过流写到服务器，相比URLGet方式，要多设两个头信
息，且设置向服务器写入流的权限。
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public
void
loginByURLPost() {
new
Thread() {
public
void
run() {
if
(checkEmpty()) {
String servletPath =
"http://192.168.17.71/QQCenter/login"
;
String data =
"username="
+ username +
"&password="
+ password;
try
{
URL url =
new
URL(servletPath);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setRequestMethod(
"POST"
);
conn.setConnectTimeout(
5
);
conn.setRequestProperty(
"Content-Type"
,
"application/x-www-form-urlencoded"
);
conn.setRequestProperty(
"Content-Length"
, data.length()
+
""
);
conn.setDoOutput(
true
);
OutputStream out = conn.getOutputStream();
out.write(data.getBytes());
out.close();
int
responseCode = conn.getResponseCode();
if
(responseCode ==
200
) {
InputStream in = conn.getInputStream();
String content = NetUtils.readStream(in);
showToast(content);
in.close();
System.out.println(
"以URLPost方式登陆"
);
}
else
{
showToast(
"服务器找不到资源"
);
}
}
catch
(Exception e) {
e.printStackTrace();
showToast(
"服务器忙！！！"
);
}
}
}
}.start();
}
|
3）ClientGet方式
HttpClient这个类，相比HttpURLConnection语法上有很多的不同。将请求和响应单独封装
成了一个类。获取服务器数据是经过多层包装的，需要先得到数据的实体HttpEntity,根据实体
再得到服务器的输出流。
android DefaultHttpClient 超时
http://blog.csdn.net/howlaa/article/details/17437463
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public
void
loginByClientGet() {
new
Thread() {
public
void
run() {
if
(checkEmpty()) {
String servletPath =
"http://192.168.17.71/QQCenter/login"
;
String data =
"username="
+ username +
"&password="
+ password;
String url = servletPath +
"?"
+ data;
try
{
HttpClient client =
new
DefaultHttpClient();
HttpGet get =
new
HttpGet(url);
HttpResponse response = client.execute(get);
int
responseCode = response.getStatusLine()
.getStatusCode();
if
(responseCode ==
200
) {
HttpEntity entity = response.getEntity();
InputStream in = entity.getContent();
String content = NetUtils.readStream(in);
showToast(content);
in.close();
System.out.println(
"以ClientGet方式登陆"
);
}
else
{
showToast(
"服务器找不到资源"
);
}
}
catch
(Exception e) {
e.printStackTrace();
showToast(
"服务器忙！！！"
);
}
}
}
}.start();
}
|
4）ClientPost方式
相对ClientGet方式，这种方式提交数据稍微有些复杂。创建post请求的实体数据时，要经
过多层包装。
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public
void
loginByClientPost() {
new
Thread() {
public
void
run() {
if
(checkEmpty()) {
String servletPath =
"http://192.168.17.71/QQCenter/login"
;
String data =
"username="
+ username +
"&password="
+ password;
String url = servletPath;
try
{
HttpClient client =
new
DefaultHttpClient();
HttpPost post =
new
HttpPost(url);
List<NameValuePair> listPairs =
new
ArrayList<NameValuePair>();
NameValuePair pair1 =
new
BasicNameValuePair(
"username"
, username);
NameValuePair pair2 =
new
BasicNameValuePair(
"password"
, password);
listPairs.add(pair1);
listPairs.add(pair2);
HttpEntity postDataEntity =
new
UrlEncodedFormEntity(
listPairs);
post.setEntity(postDataEntity);
HttpResponse response = client.execute(post);
int
statusCode = response.getStatusLine()
.getStatusCode();
if
(statusCode ==
200
) {
HttpEntity respEntity = response.getEntity();
InputStream in = respEntity.getContent();
String content = NetUtils.readStream(in);
showToast(content);
in.close();
System.out.println(
"以ClientPost方式登陆"
);
}
else
{
showToast(
"找不到资源"
);
}
}
catch
(Exception e) {
e.printStackTrace();
showToast(
"服务器忙！！！"
);
}
}
};
}.start();
}
|
5）AsyncHttpClientGet方式
在使用这个类之前，去GitHub下载并导一下这个包com.loopj.android.http到项目的src目
录下。使用AsyncHttpClient还有一个十分爽的地方，就是这个类不需要使用在子线程中，那么
也就可以直接更新UI。请求地址就直接写servlet了，也不用拼接参数了，因为参数都写在了
RequestParams对象中去了。
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public
void
loginByAsyncHttpClientGet() {
if
(checkEmpty()) {
String servletPath =
"http://192.168.1.109/QQCenter/login"
;
try
{
AsyncHttpClient asyncHttpClient =
new
AsyncHttpClient();
RequestParams params =
new
RequestParams();
params.put(
"username"
, username);
params.put(
"password"
, password);
asyncHttpClient.get(getApplicationContext(), servletPath, params,
new
AsyncHttpResponseHandler(){
@Override
public
void
onSuccess(
int
statusCode, Header[] headers,
byte
[] responseBody) {
if
(statusCode ==
200
)
{
String content =
new
String(responseBody);
Toast.makeText(getApplicationContext(), content,
0
).show();
System.out.println(
"AsyncHttpClientGet方式登陆"
);
}
else
{
Toast.makeText(getApplicationContext(),
"找不到资源"
,
0
).show();
}
}
@Override
public
void
onFailure(
int
statusCode, Header[] headers,
byte
[] responseBody, Throwable error) {
}
});
}
catch
(Exception e) {
e.printStackTrace();
showToast(
"服务器忙！！！"
);
}
}
}
|
6）AsyncHttpClientPost方式
和AsyncHttpClientGet方式相差无几，调用的是post方法。其它的一样
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public
void
loginByAsyncHttpClientPost() {
if
(checkEmpty()) {
String servletPath =
"http://192.168.17.71/QQCenter/login"
;
try
{
AsyncHttpClient asyncHttpClient =
new
AsyncHttpClient();
RequestParams params =
new
RequestParams();
params.put(
"username"
, username);
params.put(
"password"
, password);
asyncHttpClient.post(getApplicationContext(), servletPath, params,
new
AsyncHttpResponseHandler(){
@Override
public
void
onSuccess(
int
statusCode, Header[] headers,
byte
[] responseBody) {
if
(statusCode ==
200
)
{
String content =
new
String(responseBody);
Toast.makeText(getApplicationContext(), content,
0
).show();
System.out.println(
"AsyncHttpClientPost方式登陆"
);
}
else
{
Toast.makeText(getApplicationContext(),
"找不到资源"
,
0
).show();
}
}
@Override
public
void
onFailure(
int
statusCode, Header[] headers,
byte
[] responseBody, Throwable error) {
}
});
}
catch
(Exception e) {
e.printStackTrace();
showToast(
"服务器忙！！！"
);
}
}
}
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提交数据的方式，这么多种，怎么使用呢？
HttpClient已被AsyncHttpClient所替代，一般开发都用后者。但是遇到特殊需求时，还是需要
用到最基础的HttpURLConnection,因为它可以设置请求头的参数信息。
二、提交数据时中文乱码问题
待进一步理解
本文转自屠夫章哥 51CTO博客，原文链接：http://blog.51cto.com/4259297/1676565，如需转载请自行联系原作者
