DefaultHttpClient使用

 1 httpClient封装后使用，get和post方法

package util;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONObject;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;

/**
* @Title:TestHttpClient
* @Author Tony
* @Date: 2014年6月21日 下午3:29:37
* @Description: httpClient使用，1 发送post请求 2 发送get请求
*
*/
public class TestHttpClient {

/**
* @Title: methodPost
* @Description: httpclient方法中post提交数据的使用
* @param @return
* @param @throws Exception
* @return String
* @throws
*/
public static String methodPost() throws Exception {
DefaultHttpClient httpclient = new DefaultHttpClient();
// // 代理的设置
// HttpHost proxy = new HttpHost("10.60.8.20", 8080);
// httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,
// proxy);

// 目标地址
HttpPost httppost = new HttpPost(
"http://localhost:8011/testServlet");
System.out.println("请求: " + httppost.getRequestLine());

// post 参数 传递
List<BasicNameValuePair> nvps = new ArrayList<BasicNameValuePair>();
nvps.add(new BasicNameValuePair("content", "11111111")); // 参数
nvps.add(new BasicNameValuePair("path", "D:/file")); // 参数
nvps.add(new BasicNameValuePair("name", "8")); // 参数
nvps.add(new BasicNameValuePair("age", "9")); // 参数
nvps.add(new BasicNameValuePair("username", "wzt")); // 参数

httppost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8)); // 设置参数给Post

// 执行
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
System.out.println(response.getStatusLine());
if (entity != null) {
System.out.println("Response content length: "
+ entity.getContentLength());
}
// 显示结果
BufferedReader reader = new BufferedReader(new InputStreamReader(
entity.getContent(), "UTF-8"));

String line = null;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
if (entity != null) {
entity.consumeContent();
}
return null;

}

/**
* @Title: methodGet
* @Description: 以get方法提交数的使用
* @param @return
* @param @throws Exception
* @return String
* @throws
*/
public static String methodGet() throws Exception {
DefaultHttpClient httpclient = new DefaultHttpClient();
// // 代理的设置
// HttpHost proxy = new HttpHost("10.60.8.20", 8080);
// httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

// 目标地址
HttpPost httpGet = new HttpPost("http://localhost:8011/testServlet");

// 构造最简单的字符串数据
StringEntity reqEntity = new StringEntity("name=test&password=test");
// 设置类型
reqEntity.setContentType("application/x-www-form-urlencoded");
// 设置请求的数据
httpGet.setEntity(reqEntity);

// 执行
HttpResponse response = httpclient.execute(httpGet);
HttpEntity entity = response.getEntity();
System.out.println(response.getStatusLine());

if (entity != null) {
System.out.println("Response content length: " + entity.getContentLength()); //得到返回数据的长度
}
// 显示结果
BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));

String line = null;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
if (entity != null) {
entity.consumeContent();
}
return null;

}

/**
* 模拟url访问 从特定的url中获取json
*
* @param urlStr
* @param params
* @return json object ,or null if failed
* 参数经过封装后传过来 ，提交为 post请求
*/
private static JSONObject getJsonFromUrl(String urlStr,
Map<String, String> params) {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(urlStr);
JSONObject json = null;
try {
if (params != null) {
Iterator<String> keys = params.keySet().iterator();
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
while (keys.hasNext()) {
String key = keys.next();
nvps.add(new BasicNameValuePair(key, params.get(key)));
}
httpPost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
}
HttpResponse response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
byte[] bytes = new byte[256];
StringBuffer sb = new StringBuffer();
while (is.read(bytes) > 0) {
sb.append(new String(bytes));
bytes = new byte[256];
}
json = JSONObject.fromObject(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}

return json;
}

/**
* @Title: main
* @Description: 测试类
* @param @param args
* @return void
* @throws
*/
public static void main(String[] args) {
try {
TestHttpClient.methodGet();
// TestHttpClient.methodPost();

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} 2.后台接受数据的servlet 
public class TestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
*/
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding( "utf-8");
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");

String name = request.getParameter("name");
System.out.println("name 变量数据： "+name);
}
}