我的Android进阶之旅------>Android发送GET和POST以及HttpClient发送POST请求给服务器响应

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/title"
/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/title"
/>

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:numeric="integer"
android:text="@string/timelength"
/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/timelength"
/>
<Button android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/button"
android:onClick="save"
android:id="@+id/button"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, MainActivity!</string>
<string name="app_name">资讯管理</string>
<string name="title">标题</string>
<string name="timelength">时长</string>
<string name="button">保存</string>
<string name="success">保存成功</string>
<string name="fail">保存失败</string>
<string name="error">服务器响应错误</string>
</resources>

package cn.roco.manage;

import cn.roco.manage.service.NewsService;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

private EditText titleText;
private EditText lengthText;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
titleText = (EditText) this.findViewById(R.id.title);
lengthText = (EditText) this.findViewById(R.id.timelength);
}

public void save(View v) {
String title = titleText.getText().toString();
String length = lengthText.getText().toString();
String path = "http://192.168.1.100:8080/Hello/ManageServlet";
boolean result;
try {
//			result = NewsService.save(path, title, length, NewsService.GET);  //发送GET请求
//			result = NewsService.save(path, title, length, NewsService.POST); //发送POST请求
result = NewsService.save(path, title, length, NewsService.HttpClientPost); //通过HttpClient框架发送POST请求
if (result) {
Toast.makeText(getApplicationContext(), R.string.success, 1)
.show();
} else {
Toast.makeText(getApplicationContext(), R.string.fail, 1)
.show();
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), e.getMessage(), 1).show();
Toast.makeText(getApplicationContext(), R.string.error, 1).show();
}

}

}

package cn.roco.manage.service;

import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

public class NewsService {

public static final int POST = 1;
public static final int GET = 2;
public static final int HttpClientPost = 3;

/**
* 保存数据
*
* @param title
*            标题
* @param length
*            时长
* @param flag
*            true则使用POST请求 false使用GET请求
* @return 是否保存成功
* @throws Exception
*/
public static boolean save(String path, String title, String timelength,
int flag) throws Exception {
Map<String, String> params = new HashMap<String, String>();
params.put("title", title);
params.put("timelength", timelength);
switch (flag) {
case POST:
return sendPOSTRequest(path, params, "UTF-8");
case GET:
return sendGETRequest(path, params, "UTF-8");
case HttpClientPost:
return sendHttpClientPOSTRequest(path, params, "UTF-8");
}
return false;
}

/**
* 通过HttpClient框架发送POST请求
* HttpClient该框架已经集成在android开发包中
* 个人认为此框架封装了很多的工具类，性能比不上自己手写的下面两个方法
* 但是该方法可以提高程序员的开发速度，降低开发难度
* @param path
*            请求路径
* @param params
*            请求参数
* @param encoding
*            编码
* @return 请求是否成功
* @throws Exception
*/
private static boolean sendHttpClientPOSTRequest(String path,
Map<String, String> params, String encoding) throws Exception {
List<NameValuePair> pairs = new ArrayList<NameValuePair>();// 存放请求参数
if (params != null && !params.isEmpty()) {
for (Map.Entry<String, String> entry : params.entrySet()) {
//BasicNameValuePair实现了NameValuePair接口
pairs.add(new BasicNameValuePair(entry.getKey(), entry
.getValue()));
}
}
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs, encoding);	//pairs:请求参数   encoding:编码方式
HttpPost httpPost = new HttpPost(path); //path:请求路径
httpPost.setEntity(entity);

DefaultHttpClient client = new DefaultHttpClient(); //相当于浏览器
HttpResponse response = client.execute(httpPost);  //相当于执行POST请求
//取得状态行中的状态码
if (response.getStatusLine().getStatusCode() == 200) {
return true;
}
return false;
}

/**
* 发送POST请求
*
* @param path
*            请求路径
* @param params
*            请求参数
* @param encoding
*            编码
* @return 请求是否成功
* @throws Exception
*/
private static boolean sendPOSTRequest(String path,
Map<String, String> params, String encoding) throws Exception {
StringBuilder data = new StringBuilder();
if (params != null && !params.isEmpty()) {
for (Map.Entry<String, String> entry : params.entrySet()) {
data.append(entry.getKey()).append("=");
data.append(URLEncoder.encode(entry.getValue(), encoding));// 编码
data.append('&');
}
data.deleteCharAt(data.length() - 1);
}
byte[] entity = data.toString().getBytes(); // 得到实体数据
HttpURLConnection connection = (HttpURLConnection) new URL(path)
.openConnection();
connection.setConnectTimeout(5000);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
connection.setRequestProperty("Content-Length",
String.valueOf(entity.length));

connection.setDoOutput(true);// 允许对外输出数据
OutputStream outputStream = connection.getOutputStream();
outputStream.write(entity);

if (connection.getResponseCode() == 200) {
return true;
}
return false;
}

/**
* 发送GET请求
*
* @param path
*            请求路径
* @param params
*            请求参数
* @param encoding
*            编码
* @return 请求是否成功
* @throws Exception
*/
private static boolean sendGETRequest(String path,
Map<String, String> params, String encoding) throws Exception {
StringBuilder url = new StringBuilder(path);
url.append("?");
for (Map.Entry<String, String> entry : params.entrySet()) {
url.append(entry.getKey()).append("=");
url.append(URLEncoder.encode(entry.getValue(), encoding));// 编码
url.append('&');
}
url.deleteCharAt(url.length() - 1);
HttpURLConnection connection = (HttpURLConnection) new URL(
url.toString()).openConnection();
connection.setConnectTimeout(5000);
connection.setRequestMethod("GET");
if (connection.getResponseCode() == 200) {
return true;
}
return false;
}
}

package cn.roco.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ManageServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
String title = request.getParameter("title");
String timelength = request.getParameter("timelength");
System.out.println("视频名称：" + title);
System.out.println("视频时长：" + timelength);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}

package cn.roco.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

public class EncodingFilter implements Filter {

public void destroy() {
System.out.println("过滤完成");
}

public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
if ("GET".equals(request.getMethod())) {
EncodingHttpServletRequest wrapper=new EncodingHttpServletRequest(request);
chain.doFilter(wrapper, resp);
}else{
req.setCharacterEncoding("UTF-8");
chain.doFilter(req, resp);
}
}

public void init(FilterConfig fConfig) throws ServletException {
System.out.println("开始过滤");
}

}

package cn.roco.filter;

import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
/**
* 包装 HttpServletRequest对象
*/
public class EncodingHttpServletRequest extends HttpServletRequestWrapper {
private HttpServletRequest request;

public EncodingHttpServletRequest(HttpServletRequest request) {
super(request);
this.request = request;
}

@Override
public String getParameter(String name) {
String value = request.getParameter(name);
if (value != null && !("".equals(value))) {
try {
value=new String(value.getBytes("ISO8859-1"),"UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
return value;
}

}