使用HttpClient与外部接口通信

使用 HttpClient与外部接口通信工具类：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;

public class HttpUtil{
public static String httpPost(String urlPath,Map<String, Object> params){
PrintWriter out = null;
BufferedReader in = null;
StringBuffer result = new StringBuffer();
try {
HttpClient client = new HttpClient();
PostMethod method = new PostMethod(urlPath);
Iterator<Map.Entry<String, Object>> it = params.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, Object> entry = it.next();
method.addParameter(entry.getKey(), entry.getValue().toString());
}
HttpMethodParams param = method.getParams();
param.setContentCharset("UTF-8");
client.executeMethod(method);
in = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), "UTF-8"));
String line;
while (null != (line = in.readLine())) {
result.append(line);
}
} catch (Exception e) {
e.printStackTrace();
}
//使用finally块来关闭输出流、输入流
finally{
try{
if(out!=null){
out.close();
}
if(in!=null){
in.close();
}
}
catch(IOException ex){
ex.printStackTrace();
}
}
return result.toString();
}

public static String httpGet(String urlPath){
StringBuffer result = new StringBuffer();
BufferedReader in = null;
try {
URL realUrl = new URL(urlPath);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 建立实际的连接
conn.connect();
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
conn.getInputStream(),"utf-8"));
String line;
while ((line = in.readLine()) != null) {
result.append(line);
}
} catch (Exception e) {
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result.toString();
}
}